TPS5430DDAR PWM Converter: Working Principle, Pinout and Applications

TPS5430DDAR Introduction

The TPS5430DDAR is a high-output-current PWM converter with an integrated low-resistance, high-side N-channel MOSFET. It features accurate voltage regulation, undervoltage lockout (UVLO) at 5.5V, an internal slow-start to limit inrush current, and built-in overcurrent, overvoltage, and thermal protection.

With its internal compensation and simplified external component design, this device supports power rails up to 23V and works well in 24V bus systems. 

TPS5430DDAR Working Principle

The working principle of TPS5430DDAR can be simply understood as an efficient step-down DC-DC converter. It converts the input voltage into a stable lower output voltage through the internal switch tube (N-channel MOSFET) and the inductor coil according to the PWM modulation method. The chip has a built-in error amplifier that can detect the output voltage in real time and adjust it to ensure the stability of the output voltage.

TPS5430DDAR Pinout

BOOT: Bootstrap capacitor connection for high-side FET gate drive.

NC: No internal connection.

VSENSE: Feedback input for output voltage regulation.

ENA: Enable pin for chip on/off control.

GND: Ground.

VIN: Input voltage supply.

PH: Phase node, switching output.

TPS5430DDAR Symbol

TPS5430DDAR 3D Model

TPS5430DDAR Specification

TPS5430DDAR Features

High efficiency up to 95% enabled by 100mΩ integrated MOSFET switch

Internal compensation minimizes external parts count

Fixed 500kHz switching frequency for small filter size

Improved line regulation and transient response by input voltage feedforward

System protected by overcurrent limiting, overvoltage protection, and thermal shutdown

Available in small thermally enhanced 8-pin SO PowerPAD™ integrated circuit package

Create a custom design using the TPS5430 with the WEBENCH® Power Designer

TPS5430DDAR Applications

Consumer: set-top box, DVD, LCD displays

Industrial and car audio power supplies

Battery chargers, high-power LED supply

12V and 24V distributed power systems

TPS5430DDAR Simplified Schematic

This simplified schematic shows a typical application circuit for the TPS5430/31 step-down (buck) converter IC. The main components include the input voltage (VIN), output voltage (VOUT), an inductor, output capacitor, and feedback resistors for voltage sensing (VSENSE). The ENA pin is for enabling or disabling the chip, while the BOOT pin boosts the high-side MOSFET gate drive. The diode next to the PH pin is a catch diode, which conducts during the off-phase of the inductor current to ensure continuous current flow. 

The setup is typical of DC-DC converters for generating a lower output voltage from a higher input voltage source.

TPS5430DDAR Functional Block Diagram 

This functional block diagram illustrates the internal workings of the TPS5430DDAR, a step-down switching regulator. At the core is the PWM control loop featuring an error amplifier and PWM comparator, which continuously adjust the output to maintain a stable voltage at VSENSE. The oscillator provides the switching frequency, while the ramp generator creates the required slope compensation for current-mode control. The gate driver block then drives the internal high-side MOSFET switch through the BOOT regulator, ensuring efficient power conversion.

Additionally, the diagram shows several protective features, including undervoltage lockout (UVLO), thermal protection, and overcurrent protection (HICCUP), all of which enhance system safety. There’s also an enable (ENA) pin to control the chip’s operation, and a slow start feature to prevent inrush current during power-up. 

TPS5430DDAR Package

The TPS5430DDAR uses an 8-pin SOIC PowerPAD package. The PowerPAD at the bottom helps to quickly transfer the heat generated inside the chip to the PCB heat dissipation copper foil, improving the overall heat dissipation effect, and is suitable for power management applications.

TPS5430DDAR Equivalents

Here are 6 equivalent models or similar alternatives to the TPS5430DDAR:

- TPS5431

- TPS5432

- TPS5420

- TPS5410

- LM2675

- LM2596

How to Use TPS5430DDAR?

When using TPS5430DDAR, first you need to select the appropriate input voltage range and target output voltage according to your system requirements, and then connect the input power supply, ground wire, and load according to the circuit diagram.

Secondly, set the required output voltage by adjusting the resistor divider network on the feedback pin (VSENSE). The chip can only work properly if the pin (ENA) is at a high level. In addition, pay attention to heat dissipation conditions when using it. Finally, reasonably layout the PCB routing to avoid interference, and use appropriate inductor and capacitor components to meet system requirements.

FAQs

What protections are built into the TPS5430DDAR?

It has overcurrent protection, thermal shutdown, and undervoltage lockout.

What is the package type?

It’s available in an 8-pin SOIC PowerPAD package.

In what applications is it commonly used?

It’s typically used in DC-DC converters, industrial automation, automotive, and general power supplies.

What is its typical efficiency?

Efficiency can be as high as 95%, depending on the load and input/output voltage conditions.