AN4345 Datasheet, PDF (1/28 Pages) STMicroelectronics – This document describes a two output buck with the VIPer16LD

AN4345
Application note
STEVAL-ISA119V1: 1.5 W double output buck product evaluation
board based on the VIPER16LD
Mirko Sciortino
Introduction
This document describes a two output buck with the VIPer16LD, a new offline high voltage
converter by ST, specifically developed for non-isolated SMPS. In fact the output regulation
is easily obtained by a voltage divider connected to the feedback FB pin. Moreover, the
VIPer16LD can be externally biased or self-biased. The former reaches very low standby-
consumption (< 60 mW at 230 V_AC), the latter saves costs and complication of the IC
supplying network. The other device’s features are:
• 800 V avalanche rugged power section,
• PWM operation at 60 kHz with frequency jittering for lower EMI
• Limiting current with adjustable set point
• On-board soft-start
• Safe auto-restart after a fault condition
The available protection includes: thermal shutdown with hysteresis, delayed overload
protection and open loop failure protection. Protection is in auto-restart mode.
Figure 1. Product evaluation board picture
December 2014
DocID025078 Rev 1
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