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Features
- Secondary side high speed SR controller
- DCM, CrCM flyback and resonant half-bridge topologies
- 200V proprietary IC technology
- Max 500 kHz switching frequency
- Anti-bounce logic and UVLO protection
- 7A peak turn off drive current
- Micropower start-up and ultra low quiescent current
- 10.7V gate drive clamp
- 50ns turn-off propagation delay
- VCC range from 11.3V to 20V
- Direct sensing of MOSFET drain voltage
- Enable function synchronized with MOSFET VDS transition
- Cycle by cycle MOT check circuit prevents multiple false trigger gate pulses
- Lead free
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Advantages
- The IR11672AS(TR)PbF is a smart secondary-side synchronous rectification (SR) controller designed to drive N-Channel power MOSFETs used as synchronous rectifiers in isolated flyback and resonsant half-bridge converters.
- As a result of the device’s MOT protection circuitry, reverse current is prevented at very light load or no load conditions in both flyback and resonant half-bridge converters, while power shutdown spikes that cause avalanche breakdown in resonant half-bridge converters are minimized during power off for highly reliable operation.
- The device accurately determines turn-on and turn-off based on MOSFET drain sensing voltage in close proximity to zero current transition, eliminating the need for additional components including heatsink to simplify design. Ruggedness and noise immunity are accomplished using an advanced blanking scheme and double-pulse suppression to allow reliable operation in fixed and variable frequency applications.
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