AN3028 datasheet(1/37 Pages) STMICROELECTRONICS

Part #	AN3028

Description	demonstration board using the VIPer16LN

PDF	37 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 37 page

August 2011

Doc ID 16135 Rev 1

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AN3028

Application note

EVLVIP16L-4WFN: 16 V / 4.5 W, 60 kHz non-isolated flyback

demonstration board using the VIPer16LN

Introduction

This document describes a 16 V - 280 mA power supply set in non-isolated flyback topology

with the VIPer16LN, a new offline high-voltage converter by STMicroelectronics.

The features of the device include an 800 V avalanche rugged power section, PWM

operation at 60 kHz with frequency jittering for lower EMI, current limiting with adjustable

setpoint, on-board soft-start, and safe auto-restart after a fault condition.

Moreover, the VIPer16LN can work with or without the auxiliary winding. Operating with the

auxiliary winding, it can attain very low standby consumption. Operating without the auxiliary

winding, the IC is supplied by an internal current generator, thus saving the cost of the

transformer’s auxiliary winding. Both possibilities are discussed in this application note.

The protections available include a thermal shutdown with hysteresis, delayed overload

protection, and open-loop failure protection (available only if the auxiliary winding is used).

Figure 1.

EVLVIP16L- 4WFN demonstration board

www.st.com

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