3515AL-S14-R datasheet(7/9 Pages) UTC

7 / 9 page

3515A

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

7 of 9

www.unisonic.com.tw

QW-R502-105,A

APPLICATION INFORMATION

IL

RL

C

+

V5

R

-

I5

8×IREF

(IREF=VREF/RI)

RL: inductor DC resistor

If IL* RL＞ (8 * IREF) * R, then OCP active.

And the capacitor C is used to avoide power on fail or dynamic load fail.We suggest C > 1µF.

EX：How to select the resistor of R? Assume RI=30KΩ, RL=3mΩ, OCP=20A。

Sol：R = ( IL * RL ) / ( 8 * IREF )

= ( 20A * 3mΩ) / { 8 * ( 1.2V / 30KΩ)}

= 187.5Ω

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