VIPER53-E datasheet(16/36 Pages) STMICROELECTRONICS

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VIPER53-E Datasheet(PDF) 16 Page - STMicroelectronics

Part #	VIPER53-E

Description	OFF-line primary switch

PDF	36 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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16 / 36 page

Primary regulation configuration example

VIPer53 - E

16/36

The switching frequency can be set to any value through the choice of R3 and C5. This

allows to optimize the efficiency of the converter by adopting the best compromise between

switching losses, EMI (Lower with low switching frequencies) and transformer size (Smaller

with high switching frequencies). For an output power of a few watts, typical switching

frequencies between 20kHz and 40kHz because of the small size of the transformer. For

higher power, 70kHz to 130kHz are generally chosen.

The R5 compensation resistor value sets the dynamic behavior of the converter. It can be

adjusted to provide the best compromise between stability and recovery time with fast load

changes.

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