APW7145 datasheet(14/23 Pages) ANPEC

Part #	APW7145

Description	3A, 12V, Synchronous-Rectified Buck Converter

PDF	23 Pages

Scroll/Zoom	100%

Manufacturer	ANPEC [Anpec Electronics Coropration]

Direct Link	http://www.anpec.com.tw

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14 / 23 page

Rev. A.7 - Mar., 2011

APW7145

www.anpec.com.tw

Function Description (Cont.)

Current-Limit Protection

The APW7145 monitors the output current, flowing through

the high-side power MOSFET, and limits the current peak

at current-limit level to prevent loads and the IC from dam-

ages during overload or short-circuit conditions.

Frequency Foldback

The foldback frequency is controlled by the FB voltage.

When the output is shortened to the ground, the frequency

of the oscillator will be reduced to 80kHz. This lower fre-

quency allows the inductor current to safely discharge,

thereby preventing current runaway. The oscillator’s fre-

quency will gradually increase to its designed rate when

the feedback voltage on FB again approaches 0.8V.

APW7145 Datasheet(PDF) 14 Page - Anpec Electronics Coropration