Step-down synchronous rectifier pulse width modulator (PWM) controller | Heisener Electronics
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Step-down synchronous rectifier pulse width modulator (PWM) controller

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Post Date: 2023-01-14, Renesas Electronics America

The ISL6522 provides complete control and protection for DC-DC converters optimized for high performance microprocessor applications. It is designed to drive two n-channel MosFeTs in a synchronous rectifier step-down topology. ISL6522 integrates all control, output tuning, monitoring, and protection functions into a single package.Converter output voltage can be finely adjusted to 0.8 V, the right temperature and maximum tolerance of the line voltage change ±1%.

Typical application

                      

The ISL6522 provides simple, single feedback loop, voltage mode control and fast transient response. It includes a 200kHz free-running triangle wave oscillator that can be adjusted from less than 50kHz to more than 1MHz. Error amplifier with 15 MHZ gain bandwidth product and 6v s conversion rate, which can realize high converter bandwidth fast transient performance.

The resulting PWM duty cycle ranges from 0 to 100%. The ISL6522 prevents overcurrent conditions by suppressing PWM operation. The ISL6522 eliminates the need for current sensing resistance by using the rDS(ON) of the upper mosFETs to monitor the current.

Block Diagram

          

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