BH0270A Datasheet – Green Mode Fairchild Power Switch

Part Number: BH0270A

Function: Green Mode Fairchild Power Switch (FPS™)

Manufacturer: Fairchild Semiconductor


BH0270A datasheet



The highly integrated FSBH-series consists of an integrated current-mode Pulse Width Modulator (PWM) and an avalanche-rugged 700V SenseFET. It is specifically designed for high-performance offline Switch Mode Power Supplies (SMPS) with minimal external components.

The integrated PWM controller features include a proprietary green-mode function that provides off-time modulation to linearly decrease the switching frequency at light-load conditions to minimize standby power consumption. To avoid acoustic-noise problems, the
minimum PWM frequency is set above 18kHz. This green-mode function enables the power supply to meet international power conservation requirements.

The PWM controller is manufactured using the BiCMOS process to further reduce power consumption. The FSBH-series turns off some internal circuits to improve power saving when VFBis lower than 1.6V, which allows an operating current of only 2.5mA.



1. Brownout Protection with Hysteresis
2. Built-In 5ms Soft-Start Function
3. Internal Avalanche-Rugged 700V SenseFET
4. No Acoustic Noise During Light-Load Operation
5. High-Voltage Startup
6. Linearly Decreasing PWM Frequency to 18KHz
7. Peak-Current-Mode Control

Other data sheets are available within the file:

BH0170, BH0170A, BH0270, BH0370


BH0270A Datasheet PDF Download

BH0270A pdf