AN2934 Datasheet, PDF (1/27 Pages) STMicroelectronics – The new VIPer17 device is a converter that offers a PWM controller built in BCD6

AN2934
Application note
STEVAL-ISA062V1: 6 W, wide-range dual and single output SMPS
demonstration board based on the VIPer17
By John Lo Giudice
Introduction
The new VIPer17 device is a converter that offers a PWM controller built in BCD6
technology and an 800 V, avalanche-rugged vertical power section all in one package. The
converter is housed in a DIP7 or surface-mount SO-16 narrow package. The device has two
fixed switching frequencies: the VIPer17LN switches at 60 kHz and the VIPer17HN at
115 kHz. The device can deliver 6 W from wide-range operation from 85 to 305 Vac. It can
also deliver 10 W when operating from the European range of 175 to 264 Vac.
The VIPer17 incorporates the following additional features in high demand from customers.
■ Burst mode operation has been improved from earlier VIPers, providing a switching power
supply standby wattage as low as 50 mW at no load
■ Frequency jittering is implemented to ensure EMI measurements meet today's standards.
■ Adjustable overload
■ Output short-circuit protection for hard shorts such as transformer saturation or shorted
diode
■ Adjustable brownout and power surge features
■ Output overvoltage protection.
Not all of these additional features are necessary to operate the converter and some may be
omitted to reduce part count.
Figure 1. VIPer17 dual output demonstration board
September 2012
Doc ID 15394 Rev 1
AM03418v1
1/27
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