CM6901XISTR is an SLS, SRC/LLC + SR resonant controller on APW3++ power supply, and it can work in SRC and LLC area, synchronous rectification for high efficiency. In addition, it is used for DC-DC conversion in offline applications. Its light load regulation is achieved by switching the controller from frequency modulation mode to PWM mode. To achieve the best balance performance between hold-up time and efficiency, its frequency range spans fr1 (resonant frequency).

Feature:

• Smaller and thinner transformers

• 20ms with reasonable bulk cap (hold time)

• SLS, SRC/LLC + SR resonant controller

• Supply voltage range: 10V to 20V

• UVLO =11V with 1V hysteresis

• Reference OK comparator

• FM + 2 PWMING mode operation

• Light Load PWMING (light load regulation)

• SR ideal diode PWMING (cross resonant frequency application)

• GM FEAO, FM modulation error amplifier

• GM DEAO, PWM error amplifier

• Closed-loop soft-start capability with the shutdown.

• Automatic restart during current limiting

• Precision 2.5V VFB threshold for constant voltage feedback loop

• Precision 1V I limit threshold

Application:

• DC-DC power supply

• APW3++ PSU