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TOP259LN

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TOP259LN

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Part Number TOP259LN
Manufacturer Power Integrations
Description IC OFFLINE SWIT PROG OVP 7FESIP
Datasheet TOP259LN Datasheet
Package 7-SIP, 6 Leads, Exposed Pad, Formed Leads
In Stock 11,998 piece(s)
Unit Price $ 2.3940 *
Lead Time Can Ship Immediately
Estimated Delivery Time Jan 30 - Feb 4 (Choose Expedited Shipping)
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Part Number # TOP259LN (PMIC - AC DC Converters, Offline Switchers) is manufactured by Power Integrations and distributed by Heisener. Being one of the leading electronics distributors, we carry many kinds of electronic components from some of the world’s top class manufacturers. Their quality is guaranteed by its stringent quality control to meet all required standards.

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TOP259LN Specifications

ManufacturerPower Integrations
CategoryIntegrated Circuits (ICs) - PMIC - AC DC Converters, Offline Switchers
Datasheet TOP259LNDatasheet
Package7-SIP, 6 Leads, Exposed Pad, Formed Leads
SeriesTOPSwitch?-HX
Output IsolationIsolated
Internal Switch(s)Yes
Voltage - Breakdown700V
TopologyFlyback
Voltage - Start Up-
Voltage - Supply (Vcc/Vdd)-
Duty Cycle78%
Frequency - Switching66kHz, 132kHz
Power (Watts)162W
Fault ProtectionCurrent Limiting, Over Temperature, Over Voltage
Control Features-
Operating Temperature-40°C ~ 150°C (TJ)
Package / Case7-SIP, 6 Leads, Exposed Pad, Formed Leads
Supplier Device PackageeSIP-7F
Mounting TypeThrough Hole

TOP259LN Datasheet

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TOP252-262 TOPSwitch-HX Family www.powerint.com June 2013 Enhanced EcoSmart™, Integrated Off-Line Switcher with Advanced Feature Set and Extended Power Range ™ Product Highlights Lower System Cost, Higher Design Flexibility • Multi-mode operation maximizes efficiency at all loads • New eSIP-7F and eSIP-7C packages • Low thermal impedance junction-to-case (2 °C per watt) • Low height is ideal for adapters where space is limited • Simple mounting using a clip to aid low cost manufacturing • Horizontal eSIP-7F package ideal for ultra low height adapter and monitor applications • Extended package creepage distance from DRAIN pin to adjacent pin and to heat sink • No heat sink required up to 35 W using P, G and M packages with universal input voltage and up to 48 W at 230 VAC • Output overvoltage protection (OVP) is user programmable for latching/non-latching shutdown with fast AC reset • Allows both primary and secondary sensing • Line undervoltage (UV) detection prevents turn-off glitches • Line overvoltage (OV) shutdown extends line surge limit • Accurate programmable current limit • Optimized line feed-forward for line ripple rejection • 132 kHz frequency (254Y-258Y and all E/L packages) reduces transformer and power supply size • Half frequency option for video applications • Frequency jittering reduces EMI filter cost Figure 1. Typical Flyback Application. • Heat sink is connected to SOURCE for low EMI • Improved auto-restart delivers <3% of maximum power in short circuit and open loop fault conditions • Accurate hysteretic thermal shutdown function automatically recovers without requiring a reset • Fully integrated soft-start for minimum start-up stress • Extended creepage between DRAIN and all other pins improves field reliability PI-4510-100206 AC IN DC OUT D S C TOPSwitch-HX CONTROL V + - F X Output Power Table Product5 230 VAC ±15%4 85-265 VAC Adapter1 Open Frame2 Peak 3 Adapter1 Open Frame2 Peak 3 TOP252PN/GN 9 W 15 W 21 W 6 W 10 W 13 W TOP252MN 21 W 13 W TOP253PN/GN 15 W 25 W 38 W 9 W 15 W 25 W TOP253MN 43 W 29 W TOP254PN/GN 16 W 28 W 47 W 11 W 20 W 30 W TOP254MN 62 W 40 W TOP255PN/GN 19 W 30 W 54 W 13 W 22 W 35 W TOP255MN 81 W 52 W TOP256PN/GN 21 W 34 W 63 W 15 W 26 W 40 W TOP256MN 98 W 64 W TOP257PN/GN 25 W 41 W 70 W 19 W 30 W 45 W TOP257MN 119 W 78 W TOP258PN/GN 29 W 48 W 77 W 22 W 35 W 50 W TOP258MN 140 W 92 W Table 1. Output Power Table. (for notes see page 2). Product5 230 VAC ±15% 85-265 VAC Adapter1 Open Frame2 Adapter 1 Open Frame2 TOP252EN/EG 10 W 21 W 6 W 13 W TOP253EN/EG 21 W 43 W 13 W 29 W TOP254EN/YN/EG 30 W 62 W 20 W 43 W TOP255EN/YN/EG 40 W 81 W 26 W 57 W TOP255LN 40 W 81 W 26 W 57 W TOP256EN/YN/EG 60 W 119 W 40 W 86 W TOP256LN 60 W 88 W 40 W 64 W TOP257EN/YN/EG 85 W 157 W 55 W 119 W TOP257LN 85 W 105 W 55 W 78 W TOP258EN/YN/EG 105 W 195 W 70 W 148 W TOP258LN 105 W 122 W 70 W 92 W TOP259EN/YN/EG 128 W 238 W 80 W 171 W TOP259LN 128 W 162 W 80 W 120 W TOP260EN/YN/EG 147 W 275 W 93 W 200 W TOP260LN 147 W 190 W 93 W 140 W TOP261EN/YN/EG 177 W 333 W 118 W 254 W TOP261LN 177 W 244 W 118 W 177 W TOP262EN6 177 W 333 W 118 W 254 W TOP262LN6 177 W 244 W 118 W 177 W

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Rev. H 06/13 2 TOP252-262 www.powerint.com EcoSmart™– Energy Efficient • Energy efficient over entire load range • No-load consumption • Less than 200 mW at 230 VAC • Standby power for 1 W input • >600 mW output at 110 VAC input • >500 mW output at 265 VAC input Description TOPSwitch-HX cost effectively incorporates a 700 V power MOSFET, high voltage switched current source, PWM control, oscillator, thermal shutdown circuit, fault protection and other control circuitry onto a monolithic device. PI-4973-122607 AC IN DC OUT D S CTOPSwitch-HX CONTROL V + - GX Figure 2. Typical Flyback Application TOP259YN, TOP260YN and TOP261YN. Y Package Option for TOP259-261 In order to improve noise-immunity on large TOPSwitch-HX Y package parts, the F pin has been removed (TOP259-261YN are fixed at 66 kHz switching frequency) and replaced with a SIGNAL GROUND (G) pin. This pin acts as a low noise path for the C pin capacitor and the X pin resistor. It is only required for the TOP259-261YN package parts. Notes for Table 1: 1. Minimum continuous power in a typical non-ventilated enclosed adapter measured at +50 °C ambient. Use of an external heat sink will increase power capability. 2. Minimum continuous power in an open frame design at +50 °C ambient. 3. Peak power capability in any design at +50 °C ambient. 4. 230 VAC or 110/115 VAC with doubler. 5. Packages: P: DIP-8C, G: SMD-8C, M: SDIP-10C, Y: TO-220-7C, E: eSIP-7C, L: eSIP-7F. See part ordering information. 6. TOP261 and TOP262 have the same current limit set point. In some applications TOP262 may run cooler than TOP261 due to a lower RDS(ON) for the larger device.

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Rev. H 06/13 3 TOP252-262 www.powerint.com Section List Functional Block Diagram ....................................................................................................................................... 4 Pin Functional Description ...................................................................................................................................... 6 TOPSwitch-HX Family Functional Description ....................................................................................................... 7 CONTROL (C) Pin Operation .................................................................................................................................... 8 Oscillator and Switching Frequency .......................................................................................................................... 8 Pulse Width Modulator ............................................................................................................................................ 9 Maximum Load Cycle .............................................................................................................................................. 9 Error Amplifier .......................................................................................................................................................... 9 On-Chip Current Limit with External Programmability ............................................................................................... 9 Line Undervoltage Detection (UV) ........................................................................................................................... 10 Line Overvoltage Shutdown (OV) ............................................................................................................................ 11 Hysteretic or Latching Output Overvoltage Protection (OVP)................................................................................... 11 Line Feed-Forward with DCMAX Reduction .............................................................................................................. 13 Remote ON/OFF and Synchronization .................................................................................................................... 13 Soft-Start ............................................................................................................................................................... 13 Shutdown/Auto-Restart ......................................................................................................................................... 13 Hysteretic Over-Temperature Protection ................................................................................................................. 13 Bandgap Reference ............................................................................................................................................... 13 High-Voltage Bias Current Source .......................................................................................................................... 13 Typical Uses of FREQUENCY (F) Pin ...................................................................................................................... 15 Typical Uses of VOLTAGE MONITOR (V) and EXTERNAL CURRENT LIMIT (X) Pins .......................................... 16 Typical Uses of MULTI-FUNCTION (M) Pin ........................................................................................................... 18 Application Examples .............................................................................................................................................. 21 A High Efficiency, 35 W, Dual Output – Universal Input Power Supply ..................................................................... 21 A High Efficiency, 150 W, 250-380 VDC Input Power Supply .................................................................................. 22 A High Efficiency, 20 W Continuous – 80 W Peak, Universal Input Power Supply ................................................... 23 A High Efficiency, 65 W, Universal Input Power Supply ........................................................................................... 24 Key Application Considerations .............................................................................................................................. 25 TOPSwitch-HX vs.TOPSwitch-GX ....................................................................................................................... . 25 TOPSwitch-HX Design Considerations .................................................................................................................. 26 TOPSwitch-HX Layout Considerations ................................................................................................................... 27 Quick Design Checklist .......................................................................................................................................... 31 Design Tools .......................................................................................................................................................... 31 Product Specifications and Test Conditions .......................................................................................................... 32 Typical Performance Characteristics .................................................................................................................... 39 Package Outlines .................................................................................................................................................... 43 Part Ordering Information ........................................................................................................................................ 47

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Rev. H 06/13 4 TOP252-262 www.powerint.com Figure 3a. Functional Block Diagram (P and G Packages). Figure 3b. Functional Block Diagram (M Package). PI-4643-082907 SHUTDOWN/ AUTO-RESTART CLOCK CONTROLLED TURN-ON GATE DRIVER CURRENT LIMIT COMPARATOR INTERNAL UV COMPARATOR INTERNAL SUPPLY 5.8 V 4.8 V SOURCE (S) SOURCE (S) S R Q DMAX STOP SOFT START CONTROL (C) VOLTAGE MONITOR (V) - + 5.8 V IFB 1 V ZC VC + - + - + - LEADING EDGE BLANKING √ 16 1 HYSTERETIC THERMAL SHUTDOWN SHUNT REGULATOR/ ERROR AMPLIFIER + - DRAIN (D) ON/OFF DCMAX DCMAX 0 OV/ UV OVP V VI (LIMIT) CURRENT LIMIT ADJUST VBG + VT LINE SENSE SOFT START OFF F REDUCTION F REDUCTION STOP LOGIC EXTERNAL CURRENT LIMIT (X) OSCILLATOR WITH JITTER PWM KPS(UPPER) KPS(LOWER) SOFT START IFB IPS(UPPER) IPS(LOWER) KPS(UPPER) KPS(LOWER) PI-4508-120307 SHUTDOWN/ AUTO-RESTART CLOCK CONTROLLED TURN-ON GATE DRIVER CURRENT LIMIT COMPARATOR INTERNAL UV COMPARATOR INTERNAL SUPPLY 5.8 V 4.8 V KPS(UPPER) KPS(LOWER) SOURCE (S) SOURCE (S) S R Q DMAX STOP SOFT START CONTROL (C) MULTI- FUNCTION (M) - + 5.8 V IFB ZC VC + - + - + - LEADING EDGE BLANKING √ 16 1 HYSTERETIC THERMAL SHUTDOWN SHUNT REGULATOR/ ERROR AMPLIFIER + - DRAIN (D) ON/OFF DCMAX DCMAX 0 OV/ UV OVP V VI (LIMIT) CURRENT LIMIT ADJUST VBG + VT LINE SENSE SOFT START SOFT START IFB IPS(UPPER) IPS(LOWER) KPS(UPPER) KPS(LOWER) OFF F REDUCTION F REDUCTION STOP LOGIC OSCILLATOR WITH JITTER PWM

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Rev. H 06/13 5 TOP252-262 www.powerint.com Figure 3c. Functional Block Diagram (TOP254-258 YN Package and all eSIP Packages). PI-4511-082907 SHUTDOWN/ AUTO-RESTART CLOCK CONTROLLED TURN-ON GATE DRIVER CURRENT LIMIT COMPARATOR INTERNAL UV COMPARATOR INTERNAL SUPPLY 5.8 V 4.8 V SOURCE (S) SOURCE (S) S R Q DMAX STOP SOFT START CONTROL (C) VOLTAGE MONITOR (V) FREQUENCY (F) - + 5.8 V IFB 1 V ZC VC + - + - + - LEADING EDGE BLANKING √ 16 1 HYSTERETIC THERMAL SHUTDOWN SHUNT REGULATOR/ ERROR AMPLIFIER + - DRAIN (D) ON/OFF DCMAX DCMAX 66k/132k 0 OV/ UV OVP V VI (LIMIT) CURRENT LIMIT ADJUST VBG + VT LINE SENSE SOFT START OFF F REDUCTION F REDUCTION STOP LOGIC EXTERNAL CURRENT LIMIT (X) OSCILLATOR WITH JITTER PWM KPS(UPPER) KPS(LOWER) SOFT START IFB IPS(UPPER) IPS(LOWER) KPS(UPPER) KPS(LOWER) PI-4974-122607 SHUTDOWN/ AUTO-RESTART CLOCK CONTROLLED TURN-ON GATE DRIVER CURRENT LIMIT COMPARATOR INTERNAL UV COMPARATOR INTERNAL SUPPLY 5.8 V 4.8 V SIGNAL GROUND (G) SOURCE (S) S R Q DMAX STOP SOFT START CONTROL (C) VOLTAGE MONITOR (V) - + 5.8 V IFB 1 V ZC VC + - + - + - LEADING EDGE BLANKING √ 16 1 HYSTERETIC THERMAL SHUTDOWN SHUNT REGULATOR/ ERROR AMPLIFIER + - DRAIN (D) SOURCE (S) ON/OFF DCMAX DCMAX 0 OV/ UV OVP V VI (LIMIT) CURRENT LIMIT ADJUST VBG + VT LINE SENSE SOFT START OFF F REDUCTION F REDUCTION STOP LOGIC EXTERNAL CURRENT LIMIT (X) OSCILLATOR WITH JITTER PWM KPS(UPPER) KPS(LOWER) SOFT START IFB IPS(UPPER) IPS(LOWER) KPS(UPPER) KPS(LOWER) Figure 3d. Functional Block Diagram TOP259YN, TOP260YN, TOP261YN.

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Rev. H 06/13 6 TOP252-262 www.powerint.com Pin Functional Description DRAIN (D) Pin: High-voltage power MOSFET DRAIN pin. The internal start-up bias current is drawn from this pin through a switched high- voltage current source. Internal current limit sense point for drain current. CONTROL (C) Pin: Error amplifier and feedback current input pin for duty cycle control. Internal shunt regulator connection to provide internal bias current during normal operation. It is also used as the connection point for the supply bypass and auto-restart/ compensation capacitor. EXTERNAL CURRENT LIMIT (X) Pin (Y, M, E and L package): Input pin for external current limit adjustment and remote ON/OFF. A connection to SOURCE pin disables all functions on this pin. Figure 4. Pin Configuration (Top View). X P I- 47 11 -0 21 30 8 DC Input Voltage + - D S C CONTROL V RIL RLS 12 kΩ 4 MΩ VUV = IUV × RLS + VV (IV = IUV) VOV = IOV × RLS + VV (IV = IOV) For RLS = 4 MΩ DCMAX@100 VDC = 76% DCMAX@375 VDC = 41% For RIL = 12 kΩ ILIMIT = 61% See Figure 55b for other resistor values (RIL) to select different ILIMIT values. VUV = 102.8 VDC VOV = 451 VDC Figure 5. TOP254-258 Y and All M/E/L Package Line Sense and Externally Set Current Limit. PI-4712-120307 DC Input Voltage + - D M S C VUV = IUV × RLS + VM (IM = IUV) VOV = IOV × RLS + VM (IM = IOV) For RLS = 4 MΩ VUV = 102.8 VDC VOV = 451 VDC DCMAX@100 VDC = 76% DCMAX@375 VDC = 41% CONTROL RLS 4 MΩ Figure 7. P/G Package Line Sense. X G P I- 49 83 -0 21 30 8 DC Input Voltage + - D S C CONTROL V RIL RLS 12 kΩ 4 MΩ VUV = IUV × RLS + VV (IV = IUV) VOV = IOV × RLS + VV (IV = IOV) For RLS = 4 MΩ DCMAX@100 VDC = 76% DCMAX@375 VDC = 41% For RIL = 12 kΩ ILIMIT = 61% See Figure 55b for other resistor values (RIL) to select different ILIMIT values. VUV = 102.8 VDC VOV = 451 VDC Figure 6. TOP259-261 Y Package Line Sense and External Current Limit. VOLTAGE MONITOR (V) Pin (Y & M package only): Input for OV, UV, line feed forward with DCMAX reduction, output overvoltage protection (OVP), remote ON/OFF and device reset. A connection to the SOURCE pin disables all functions on this pin. MULTI-FUNCTION (M) Pin (P & G packages only): This pin combines the functions of the VOLTAGE MONITOR (V) and EXTERNAL CURRENT LIMIT (X) pins of the Y package into one pin. Input pin for OV, UV, line feed forward with DCMAX PI-4644-091108 Tab Internally Connected to SOURCE Pin Tab Internally Connected to SOURCE Pin Lead Bend Outward from Drawing (Refer to eSIP-7F Package Outline Drawing) Exposed Pad (Hidden) Internally Connected to SOURCE Pin Y Package (TO-220-7C) D C S S S S S S S S S 7 D 5 F 4 S 3 C 2 X 1 V 7 D 5 S 4 F 3 C 2 X 1 V 7 D 5 S 4 F 3 C 2 X 1 V 7 D 5 G 4 S 3 C 2 X 1 V M P and G Package M Package 8 5 7 1 4 2 6 D X C V 10 6 9 1 5 8 7 2 3 Note: Y package for TOP259-261 Note: Y package for TOP254-258 E Package (eSIP-7C) L Package (eSIP-7F) Y Package (TO-220-7C)

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Rev. H 06/13 7 TOP252-262 www.powerint.com PI-4713-021308 DC Input Voltage + - D M S C For RIL = 12 kΩ ILIMIT = 61% CONTROL RIL See Figure 55b for other resistor values (RIL) to select different ILIMIT values. For RIL = 19 kΩ ILIMIT = 37% Figure 8. P/G Package Externally Set Current Limit. reduction, output overvoltage protection (OVP), external current limit adjustment, remote ON/OFF and device reset. A connection to SOURCE pin disables all functions on this pin and makes TOPSwitch-HX operate in simple three terminal mode (like TOPSwitch-II). FREQUENCY (F) Pin (TOP254-258Y, and all E and L packages): Input pin for selecting switching frequency 132 kHz if connected to SOURCE pin and 66 kHz if connected to CONTROL pin. The switching frequency is internally set for fixed 66 kHz operation in the P, G, M package and TOP259YN, TOP260YN and TOP261YN. SIGNAL GROUND (G) Pin (TOP259YN, TOP260YN & TOP261YN only): Return for C pin capacitor and X pin resistor. SOURCE (S) Pin: Output MOSFET source connection for high voltage power return. Primary side control circuit common and reference point. TOPSwitch-HX Family Functional Description Like TOPSwitch-GX, TOPSwitch-HX is an integrated switched mode power supply chip that converts a current at the control input to a duty cycle at the open drain output of a high voltage power MOSFET. During normal operation the duty cycle of the power MOSFET decreases linearly with increasing CONTROL pin current as shown in Figure 9. In addition to the three terminal TOPSwitch features, such as the high voltage start-up, the cycle-by-cycle current limiting, loop compensation circuitry, auto-restart and thermal shutdown, the TOPSwitch-HX incorporates many additional functions that reduce system cost, increase power supply performance and design flexibility. A patented high voltage CMOS technology allows both the high-voltage power MOSFET and all the low voltage control circuitry to be cost effectively integrated onto a single monolithic chip. Three terminals, FREQUENCY, VOLTAGE-MONITOR, and EXTERNAL CURRENT LIMIT (available in Y and E/L packages), two terminals, VOLTAGE-MONITOR and EXTERNAL CURRENT LIMIT (available in M package) or one terminal MULTI-FUNCTION (available in P and G package) have been used to implement some of the new functions. These terminals can be connected to the SOURCE pin to operate the TOPSwitch-HX in a TOPSwitch-like three terminal mode. However, even in this three terminal mode, the TOPSwitch-HX offers many transparent features that do not require any external components: 1. A fully integrated 17 ms soft-start significantly reduces or eliminates output overshoot in most applications by sweeping both current limit and frequency from low to high to limit the peak currents and voltages during start-up. 2. A maximum duty cycle (DCMAX) of 78% allows smaller input storage capacitor, lower input voltage requirement and/or higher power capability. 3. Multi-mode operation optimizes and improves the power supply efficiency over the entire load range while maintaining good cross regulation in multi-output supplies. Figure 9. Control Pin Characteristics (Multi-Mode Operation). PI-4645-041107 D u ty C yc le ( % ) D ra in P ea k C u rr en t To C u rr en t L im it R at io ( % ) F re q u en cy ( kH z) CONTROL Current CONTROL Current CONTROL Current ICOFFIC03IC02 IC01 IB ICD1 100 78 55 25 132 66 30 Slope = PWM Gain (constant over load range) Auto-Restart Variable Frequency Mode Low Frequency Mode Multi-Cycle Modulation Jitter Full Frequency Mode

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Rev. H 06/13 8 TOP252-262 www.powerint.com 4. Switching frequency of 132 kHz reduces the transformer size with no noticeable impact on EMI. 5. Frequency jittering reduces EMI in the full frequency mode at high load condition. 6. Hysteretic over-temperature shutdown ensures automatic recovery from thermal fault. Large hysteresis prevents circuit board overheating. 7. Packages with omitted pins and lead forming provide large drain creepage distance. 8. Reduction of the auto-restart duty cycle and frequency to improve the protection of the power supply and load during open loop fault, short circuit, or loss of regulation. 9. Tighter tolerances on I2f power coefficient, current limit reduction, PWM gain and thermal shutdown threshold. The VOLTAGE-MONITOR (V) pin is usually used for line sensing by connecting a 4 MW resistor from this pin to the rectified DC high voltage bus to implement line overvoltage (OV), under- voltage (UV) and dual-slope line feed-forward with DCMAX reduction. In this mode, the value of the resistor determines the OV/UV thresholds and the DCMAX is reduced linearly with a dual slope to improve line ripple rejection. In addition, it also provides another threshold to implement the latched and hysteretic output overvoltage protection (OVP). The pin can also be used as a remote ON/OFF using the IUV threshold. The EXTERNAL CURRENT LIMIT (X) pin can be used to reduce the current limit externally to a value close to the operating peak current, by connecting the pin to SOURCE through a resistor. This pin can also be used as a remote ON/OFF input. For the P and G package the VOLTAGE-MONITOR and EXTERNAL CURRENT LIMIT pin functions are combined on one MULTI-FUNCTION (M) pin. However, some of the functions become mutually exclusive. The FREQUENCY (F) pin in the TOP254-258 Y and E/L packages set the switching frequency in the full frequency PWM mode to the default value of 132 kHz when connected to SOURCE pin. A half frequency option of 66 kHz can be chosen by connecting this pin to the CONTROL pin instead. Leaving this pin open is not recommended. In the P, G and M packages and the TOP259-261 Y packages, the frequency is set internally at 66 kHz in the full frequency PWM mode. CONTROL (C) Pin Operation The CONTROL pin is a low impedance node that is capable of receiving a combined supply and feedback current. During normal operation, a shunt regulator is used to separate the feedback signal from the supply current. CONTROL pin voltage VC is the supply voltage for the control circuitry including the MOSFET gate driver. An external bypass capacitor closely connected between the CONTROL and SOURCE pins is required to supply the instantaneous gate drive current. The total amount of capacitance connected to this pin also sets the auto-restart timing as well as control loop compensation. When rectified DC high voltage is applied to the DRAIN pin during start-up, the MOSFET is initially off, and the CONTROL pin capacitor is charged through a switched high voltage current source connected internally between the DRAIN and CONTROL pins. When the CONTROL pin voltage VC reaches approximately 5.8 V, the control circuitry is activated and the soft-start begins. The soft-start circuit gradually increases the drain peak current and switching frequency from a low starting value to the maximum drain peak current at the full frequency over approximately 17 ms. If no external feedback/supply current is fed into the CONTROL pin by the end of the soft-start, the high voltage current source is turned off and the CONTROL pin will start discharging in response to the supply current drawn by the control circuitry. If the power supply is designed properly, and no fault condition such as open loop or shorted output exists, the feedback loop will close, providing external CONTROL pin current, before the CONTROL pin voltage has had a chance to discharge to the lower threshold voltage of approximately 4.8 V (internal supply undervoltage lockout threshold). When the externally fed current charges the CONTROL pin to the shunt regulator voltage of 5.8 V, current in excess of the consumption of the chip is shunted to SOURCE through an NMOS current mirror as shown in Figure 3. The output current of that NMOS current mirror controls the duty cycle of the power MOSFET to provide closed loop regulation. The shunt regulator has a finite low output impedance ZC that sets the gain of the error amplifier when used in a primary feedback configuration. The dynamic impedance ZC of the CONTROL pin together with the external CONTROL pin capacitance sets the dominant pole for the control loop. When a fault condition such as an open loop or shorted output prevents the flow of an external current into the CONTROL pin, the capacitor on the CONTROL pin discharges towards 4.8 V. At 4.8 V, auto-restart is activated, which turns the output MOSFET off and puts the control circuitry in a low current standby mode. The high-voltage current source turns on and charges the external capacitance again. A hysteretic internal supply undervoltage comparator keeps VC within a window of typically 4.8 V to 5.8 V by turning the high-voltage current source on and off as shown in Figure 11. The auto-restart circuit has a divide-by-sixteen counter, which prevents the output MOSFET from turning on again until sixteen discharge/ charge cycles have elapsed. This is accomplished by enabling the output MOSFET only when the divide-by-sixteen counter reaches the full count (S15). The counter effectively limits TOPSwitch-HX power dissipation by reducing the auto-restart duty cycle to typically 2%. Auto-restart mode continues until output voltage regulation is again achieved through closure of the feedback loop. Oscillator and Switching Frequency The internal oscillator linearly charges and discharges an internal capacitance between two voltage levels to create a triangular waveform for the timing of the pulse width modulator. This oscillator sets the pulse width modulator/current limit latch at the beginning of each cycle. The nominal full switching frequency of 132 kHz was chosen to minimize transformer size while keeping the fundamental EMI frequency below 150 kHz. The FREQUENCY pin (available only in TOP254-258 Y and E, L packages), when shorted to the CONTROL pin, lowers the full switching frequency to 66 kHz

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Rev. H 06/13 9 TOP252-262 www.powerint.com Figure 10. Switching Frequency Jitter (Idealized VDRAIN Waveforms). PI -4 53 0- 04 11 07 fOSC - 4 ms Time Switching Frequency VDRAIN fOSC + (half frequency), which may be preferable in some cases such as noise sensitive video applications or a high efficiency standby mode. Otherwise, the FREQUENCY pin should be connected to the SOURCE pin for the default 132 kHz. In the M, P and G packages and the TOP259-261 Y package option, the full frequency PWM mode is set at 66 kHz, for higher efficiency and increased output power in all applications. To further reduce the EMI level, the switching frequency in the full frequency PWM mode is jittered (frequency modulated) by approximately ±2.5 kHz for 66 kHz operation or ±5 kHz for 132 kHz operation at a 250 Hz (typical) rate as shown in Figure 10. The jitter is turned off gradually as the system is entering the variable frequency mode with a fixed peak drain current. Pulse Width Modulator The pulse width modulator implements multi-mode control by driving the output MOSFET with a duty cycle inversely proportional to the current into the CONTROL pin that is in excess of the internal supply current of the chip (see Figure 9). The feedback error signal, in the form of the excess current, is filtered by an RC network with a typical corner frequency of 7 kHz to reduce the effect of switching noise in the chip supply current generated by the MOSFET gate driver. To optimize power supply efficiency, four different control modes are implemented. At maximum load, the modulator operates in full frequency PWM mode; as load decreases, the modulator automatically transitions, first to variable frequency PWM mode, then to low frequency PWM mode. At light load, the control operation switches from PWM control to multi-cycle- modulation control, and the modulator operates in multi-cycle- modulation mode. Although different modes operate differently to make transitions between modes smooth, the simple relationship between duty cycle and excess CONTROL pin current shown in Figure 9 is maintained through all three PWM modes. Please see the following sections for the details of the operation of each mode and the transitions between modes. Full Frequency PWM mode: The PWM modulator enters full frequency PWM mode when the CONTROL pin current (IC) reaches IB. In this mode, the average switching frequency is kept constant at fOSC (66 kHz for P, G and M packages and TOP259-261 Y, pin selectable 132 kHz or 66 kHz for Y and E/L packages). Duty cycle is reduced from DCMAX through the reduction of the on-time when IC is increased beyond IB. This operation is identical to the PWM control of all other TOPSwitch families. TOPSwitch-HX only operates in this mode if the cycle-by-cycle peak drain current stays above kPS(UPPER)*ILIMIT(set), where kPS(UPPER) is 55% (typical) and ILIMIT(set) is the current limit externally set via the X or M pin. Variable Frequency PWM mode: When peak drain current is lowered to kPS(UPPER)* ILIMIT(set) as a result of power supply load reduction, the PWM modulator initiates the transition to variable frequency PWM mode, and gradually turns off frequency jitter. In this mode, peak drain current is held constant at kPS(UPPER)* ILIMIT(set) while switching frequency drops from the initial full frequency of fOSC (132 kHz or 66 kHz) towards the minimum frequency of fMCM(MIN) (30 kHz typical). Duty cycle reduction is accomplished by extending the off-time. Low Frequency PWM mode: When switching frequency reaches fMCM(MIN) (30 kHz typical), the PWM modulator starts to transition to low frequency mode. In this mode, switching frequency is held constant at fMCM(MIN) and duty cycle is reduced, similar to the full frequency PWM mode, through the reduction of the on-time. Peak drain current decreases from the initial value of kPS(UPPER)* ILIMIT(set) towards the minimum value of kPS(LOWER)*ILIMIT(set), where kPS(LOWER) is 25% (typical) and ILIMIT(set) is the current limit externally set via the X or M pin. Multi-Cycle-Modulation mode: When peak drain current is lowered to kPS(LOWER)*ILIMIT(set), the modulator transitions to multi-cycle-modulation mode. In this mode, at each turn-on, the modulator enables output switching for a period of TMCM(MIN) at the switching frequency of fMCM(MIN) (4 or 5 consecutive pulses at 30 kHz) with the peak drain current of kPS(LOWER)*ILIMIT(set), and stays off until the CONTROL pin current falls below IC(OFF). This mode of operation not only keeps peak drain current low but also minimizes harmonic frequencies between 6 kHz and 30 kHz. By avoiding transformer resonant frequency this way, all potential transformer audible noises are greatly suppressed. Maximum Duty Cycle The maximum duty cycle, DCMAX, is set at a default maximum value of 78% (typical). However, by connecting the VOLTAGE- MONITOR or MULTI-FUNCTION pin (depending on the package) to the rectified DC high voltage bus through a resistor with appropriate value (4 MW typical), the maximum duty cycle can be made to decrease from 78% to 40% (typical) when input line voltage increases from 88 V to 380 V, with dual gain slopes. Error Amplifier The shunt regulator can also perform the function of an error amplifier in primary side feedback applications. The shunt regulator voltage is accurately derived from a temperature- compensated bandgap reference. The CONTROL pin dynamic impedance ZC sets the gain of the error amplifier. The CONTROL pin clamps external circuit signals to the VC voltage level. The CONTROL pin current in excess of the supply current is separated by the shunt regulator and becomes the feedback current Ifb for the pulse width modulator.

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Mac*****ule

December 17, 2020

Heisener has been the best in this industry for many years. Very quick and easy if you know what you are looking for. if you don't know exactly what you are looking for, you are going to be lost.

Miche*****owell

December 16, 2020

I've had no issues. Good product, would buy again.

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