FP131 datasheet(9/11 Pages) FEELING

9 / 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

9/11

Photo-drive Comparator

The figure below shows the FP131 comparator. It has an internal reference 1.25V connecting to

the IN+ of comparator with high current sink output. That makes FP131 suitable for OCP protection

circuits using photo-coupler.

By connecting the current shunt output (CSO) to comparator IN- input for the load current (IS)

detection. The comparator output can drive the photo-coupler for the over load protection.

When the load current (IS) is increasing, the transfer function gain would amplify the CSO voltage

until the value (IO*RL) is more than 1.25V. The comparator output would change from high to low state

and sink the photo-coupler current (IOUT).

Note

1. The 1.25V reference output does not have any source and sink capability. Any resistance

divider from 1.25V bias voltage would degrade its precision.

2. The comparator has an input hysteresis (100mV typically) for noise rejection. If IN- voltage is

larger than 1.25V (REF) reference, the output (OUT) would change from high state to low, and

when IN- voltage is lower than 1.15V, the output (OUT) would change to high again.

FP131 Datasheet(PDF) 9 Page - Feeling Technology Corp.