DATASHEET
ISL78223 FN7936
Rev.4.00
May 8, 2017 ZVS Full-Bridge PWM Controller with Adjustable Synchronous Rectifier Control
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. Features Adding to the ISL78223’s feature set are average current
monitoring and soft-start. The average current signal can be
used for average current limiting, current sharing circuits, and
average current mode control. Additionally, the ISL78223
supports both voltage and current mode control. Voltage or current mode control The ISL78223 features complemented PWM outputs for
Synchronous Rectifier (SR) control. The complemented
outputs can be dynamically advanced or delayed relative to the
PWM outputs using an external control voltage. 175ВµA start-up current 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 rated for the automotive temperature range
(-40В°C to +105В°C). Related Literature For a full list of related documents, visit our website
-ISL78223 product page Adjustable resonant delay for ZVS operation Synchronous rectifier control outputs with adjustable …