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ISL78223 - ZVS Full-Bridge PWM Controller

Description

PIN NUMBER 1 SYMBOL VREF 2 VERR 3 CTBUF 4 RTD 5 RESDEL 6 CT 7 FB 8 RAMP 9 CS ISL78223 ISL78223 (20 LD QSOP) TOP VIEW VREF 1 VERR 2 CTBUF 3 RTD 4 RESDEL 5 CT 6 FB 7 RAMP 8 CS 9 IOUT 10 20 SS 19 VADJ 18 VDD 17 OUTLL 16 OUTLR 15 OUTUL 14 OUTUR 13 OUTLLN 12 OUTLRN 11 GND DESCRIPT

Features

  • complemented PWM outputs for synchronous rectifier (SR) control. The complemented outputs may be dynamically advanced or delayed relative to the PWM outputs using an external control voltage. This advanced BiCMOS design features precision deadtime and resonant delay control, and an oscillator adjustable to 2MHz operating frequency. Additionally, Multi-Pulse Suppression ensures alternating output pulses at low duty cycles where pulse skipping may occur. The ISL78223 is AEC - Q100 rated. The ISL78.

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Full PDF Text Transcription

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ZVS Full-Bridge PWM Controller with Adjustable Synchronous Rectifier Control ISL78223 The ISL78223 is a high-performance zero-voltage switching (ZVS) full-bridge PWM controller. It achieves ZVS operation by driving the upper bridge FETs at a fixed 50% duty cycle while the lower bridge FETs are trailing-edge modulated with adjustable resonant switching delays. Adding to the ISL78223’s feature set are average current monitoring and soft-start. The average current signal may be used for average current limiting, current sharing circuits and average current mode control. Additionally, the ISL78223 supports both voltage- and current-mode control. The ISL78223 features complemented PWM outputs for synchronous rectifier (SR) control.
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