Soft Sw PWM Cntrlr 4-OUT BICMOS PH SHIFT RES 1MHz 20-Pin TSSOP Tube

The UCC3895 is a phase-shift PWM controller that implements control of a full-bridge power stage by phase shifting the switching of one half-bridge with respect to the other. The device allows constant frequency pulse-width modulation in conjunction with resonant zero-voltage switching to provide high efficiency at high frequencies. The part is used either as a voltage-mode or current-mode controller.While the UCC3895 maintains the functionality of the UC3875/6/7/8 family and UC3879, it improves on that controller family with additional features such as enhanced control logic, adaptive delay set, and shutdown capability. Because the device is built using the BCDMOS process, it operates with dramatically less supply current than it’s bipolar counterparts. The UCC3895 operates with a maximum clock frequency of 1 MHz.

Programmable-Output Turnon Delay

Adaptive Delay Set

Bidirectional Oscillator Synchronization

Voltage-Mode, Peak Current-Mode, or Average
Current-Mode Control

Programmable Softstart, Softstop and
Chip Disable via a Single Pin

0% to 100% Duty-Cycle Control

7-MHz Error Amplifier

Operation to 1 MHz

Typical 5-mA Operating Current at 500 kHz

Very Low 150-µA Current During UVLO