explain

UCC3895 is a phase shift PWM controller that achieves control of the full bridge power stage by switching one half bridge relative to the other half bridge through phase shift. This device supports constant frequency pulse width modulation and resonant zero voltage switching, providing high efficiency at high frequencies. This device can be used as both a voltage mode controller and a current mode controller.

UCC3895 not only retains the functions of the UC3875/6/7/8 series and UC3879, but also improves the controller series to have additional functions such as enhanced control logic, adaptive delay setting, and shutdown function. Due to the use of BCDMOS technology for manufacturing this device, its operating current is much smaller compared to similar bipolar devices. The maximum clock frequency of UCC3895 is 1MHz.

characteristic

Programmable output turn on delay

• Adaptive delay settings

• Bidirectional oscillator synchronization

• Voltage mode, peak current mode, or average current mode control

Programmable soft start, soft stop, and chip implementation through a single pin

Disabled

0% to 100% duty cycle control

7MHz error amplifier

Working frequency up to 1MHz

Typical operating current at 500kHz is 5mA

During UVLO, there are 150 μ Extremely low operating current of A

application

• Phase shifted full bridge converter

• Offline, telecommunications, data communication, and servers

• Distributed power architecture

High density power module