L1803

Preliminary

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

6 of 6

www.unisonic.com.tw

QW-R102-058.c



TYPICAL APPLICATION CIRCUIT

IN

EN

VCC

PG

OUT

SS

FB

GND

R3

C1

C3

R1

C2

R2

UTC

L1803

Table 1. Capacitor Values for Programming the Soft-Start Time (Note)

CSS

SOFT-START TIME

Open

0.1ms

270pF

0.5ms

560pF

1ms

2.7nF

5ms

5.6nF

10ms

UTC assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or

other parameters) listed in products specifications of any and all UTC products described or contained

herein. UTC products are not designed for use in life support appliances, devices or systems where

malfunction of these products can be reasonably expected to result in personal injury. Reproduction in

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presented in this document does not form part of any quotation or contract, is believed to be accurate

and reliable and may be changed without notice.