This document describes the method of applying Fairchild Power Switch (FPSTM) FSBH series to standby auxiliary power supply. The FSBH series consists of an integrated pulse width modulator and a 700V SenseFET, designed for high-performance offline switch-mode power supplies. The product features a green-mode function and low power consumption to meet stringent standby power regulations.
The document introduces the Fairchild Power Switch (FPS) FSBH-series, an integrated current mode Pulse Width Modulator and avalanche-rugged 700V SenseFET designed for high-performance offline Switch-Mode Power Supplies. Key features include a proprietary green-mode function to minimize standby power consumption at light loads, built-in synchronized slope compensation, and fully integrated protection functions such as open-loop/overload protection (OLP), over-voltage protection (OVP), brownout protection, and over-temperature protection (OTP).
| Integrated PWM Controller Process | BiCMOS process |
|---|---|
| Green Mode Operating Current | 2.5mA |
| AC Input Voltage Range | 90V ac to 264V ac |
| MOSFET Voltage Rating | 700V |
It provides off-time modulation to linearly decrease the switching frequency at light-load conditions to minimize standby power consumption.
The series includes open-loop/overload protection (OLP), over-voltage protection (OVP), brownout protection, and over-temperature protection (OTP).
It is reasonable to set the ripple factor Kp between 0.3 and 0.6.