FP131 datasheet(10/11 Pages) FEELING

10 / 11 page

FP131

This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.

No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.

Website: http://www.feeling-tech.com.tw

Rev. 1.0

10/11

Application Information

VOUT

FP131

LOAD

RG1

RG2

VIN

GND

CSO

IN-

OUT

VCC

REF

VIP

IOUT

FP384x

VFB

Adaptor secondary over current detection/protection circuit

The above circuit is a simple application for AC / DC adaptor over current protection (OCP)

function. For example, when load current (IS) increases, the FP131 CSO voltage would increase as

equation (2) until the IN- voltage, connected to CSO pin, is higher than 1.25V reference. Then a sink

current (IOUT) flows through the photo-coupler, and FP384x PWM IC will change the NMOS drive

terminal to a minimum duty cycle current limitation for secondary over current protection. The primary

side auxiliary voltage can not maintain the FP384x’s power supply high enough, the FP384x will be

shutdown until AC line start-up voltage re-start the PWM IC.

FP131 Datasheet(PDF) 10 Page - Feeling Technology Corp.