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Off-line converters based on buck, or step-down, and buck-boost, or step-down/up, topologies convert the mains to a regulated DC output, either positive or negative, without the need for an isolation transformer by modulating the duty cycle of the power switch.

The waveform of the current in the inductor defines the converter’s mode of operation that can be continuous when the current in the inductor never drops to zero, or discontinuous when the said current stays at zero for a given time interval – and boundary or transition mode when the inductor current is zero at a single point. Both topologies can use a low-cost inductor for energy storage and the transfer from input to output.

Our VIPerPlus high-voltage converters help design high-efficiency, cost-effective off-line buck and buck-boost converters with a minimum component count and enhanced reliability thanks to a set of features including pulse skip protection that can help reduce peak current at start-up allowing the use of smaller, less expensive inductors.

In addition, we provide an extensive set evaluation and development boards as well as reference designs.

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      AN4260
      12 V, 150 mA non-isolated buck converter using the VIPER06XS, from the VIPer™ plus family
      4.2
      3.5 MB
      PDF
      AN1768
      ADMISSIBLE AVALANCHE POWER OF SCHOTTKY DIODES
      1.1
      46.82 KB
      PDF
      AN2025
      CONVERTER IMPROVEMENT USING SCHOTTKY RECTIFIER AVALANCHE SPECIFICATION
      1.1
      147.59 KB
      PDF
      AN604
      Calculation of conduction losses in a power rectifier
      3.2
      137.74 KB
      PDF
      AN4021
      Calculation of reverse losses in a power diode
      1.0
      120.47 KB
      PDF
      AN1453
      NEW FAMILY OF 150V POWER SCHOTTKY
      1.1
      131.48 KB
      PDF
      AN5046
      Printed circuit board assembly recommendations for STMicroelectronics PowerFLAT packages
      4.0
      4.82 MB
      PDF
      AN5088
      Rectifiers thermal management, handling and mounting recommendations
      2.0
      2.32 MB
      PDF
      AN443
      SERIES OPERATION ON FAST RECTIFIERS
      2.1
      202.48 KB
      PDF
      AN4273
      STEVAL-ISA114V1: 5 V / 0.8 W 30 kHz buck with the VIPer06XS
      3.0
      978.71 KB
      PDF
      AN4562
      STEVAL-ISA116V1: 5 W, 2 output wide range buck converter based on the VIPER26LD
      1.0
      896.83 KB
      PDF
      AN4345
      STEVAL-ISA119V1: 1.5 W double output buck product evaluation board based on the VIPER16LD
      1.0
      2.84 MB
      PDF
      AN4858
      STEVAL-ISA178V1 5 V/1 W 30 kHz buck demo with VIPer01
      1.0
      1.84 MB
      PDF
      AN4857
      STEVAL-ISA179V1 15 V/2.25 W 60 kHz buck demo with VIPer0P
      1.0
      1.61 MB
      PDF
      AN2872
      Super wide-range buck converter based on the VIPer16
      1.2
      581.24 KB
      PDF
      AN869
      Tj max limit of Schottky diodes
      2.2
      60.9 KB
      PDF
      AN4260

      12 V, 150 mA non-isolated buck converter using the VIPER06XS, from the VIPer™ plus family

      AN1768

      ADMISSIBLE AVALANCHE POWER OF SCHOTTKY DIODES

      AN2025

      CONVERTER IMPROVEMENT USING SCHOTTKY RECTIFIER AVALANCHE SPECIFICATION

      AN604

      Calculation of conduction losses in a power rectifier

      AN4021

      Calculation of reverse losses in a power diode

      AN1453

      NEW FAMILY OF 150V POWER SCHOTTKY

      AN5046

      Printed circuit board assembly recommendations for STMicroelectronics PowerFLAT packages

      AN5088

      Rectifiers thermal management, handling and mounting recommendations

      AN443

      SERIES OPERATION ON FAST RECTIFIERS

      AN4273

      STEVAL-ISA114V1: 5 V / 0.8 W 30 kHz buck with the VIPer06XS

      AN4562

      STEVAL-ISA116V1: 5 W, 2 output wide range buck converter based on the VIPER26LD

      AN4345

      STEVAL-ISA119V1: 1.5 W double output buck product evaluation board based on the VIPER16LD

      AN4858

      STEVAL-ISA178V1 5 V/1 W 30 kHz buck demo with VIPer01

      AN4857

      STEVAL-ISA179V1 15 V/2.25 W 60 kHz buck demo with VIPer0P

      AN2872

      Super wide-range buck converter based on the VIPer16

      AN869

      Tj max limit of Schottky diodes

    • Description Version Size Action
      UM1470
      STEVAL-ISA096V1 -12 V/150 mA adaptable buck-boost converter
      1.0
      931.46 KB
      PDF
      UM1470

      STEVAL-ISA096V1 -12 V/150 mA adaptable buck-boost converter

    • Description Version Size Action
      DN0009
      VIPer06X buck regulator, 12V 140 mA
      1.1
      490.7 KB
      PDF
      DN0009

      VIPer06X buck regulator, 12V 140 mA

Publications and Collaterals

    • Description Version Size Action
      SOD128Flat power Schottky diodes for improved cost and space-savings 1.0
      2.18 MB
      PDF

      SOD128Flat power Schottky diodes for improved cost and space-savings

    • Description Version Size Action
      Brochure Power management guide 10.2018
      4.42 MB
      PDF
      VIPerPlus - Your SMPS design deserves a Plus 05.2018
      1.08 MB
      PDF

      Brochure Power management guide

      VIPerPlus - Your SMPS design deserves a Plus

Diodes and Rectifiers

Part number Description
STTH108 800 V, 1 A Ultrafast Diode
STTH112 1200 V, 1A Ultrafast Diode
STTH15RQ06 600 V, 15 A Turbo 2 Soft Ultrafast Recovery Diode
Part number
800 V, 1 A Ultrafast Diode
1200 V, 1A Ultrafast Diode
600 V, 15 A Turbo 2 Soft Ultrafast Recovery Diode