Key facts
- Brand
- STMicroelectronics
- Model
- VIPER12AS
- Industry
- Industrial
- Documents
- 6
- Languages
- EN
- Last added
- 2012-08-06
Start here
STMicroelectronics AN1934 VIPer12AS Non Isolated Flyback Converter Reference Board Application Note
This document presents a reference board design for a non-isolated flyback converter using the VIPer12AS monolithic device. The circuit is designed to produce multiple outputs, either positive or negative, without isolation between the input and output, simplifying transformer design and production costs.
The application note details the circuit description, operating conditions, bill of materials, transformer design parameters, and PCB layout for four different variants of the power supply. It includes schematic diagrams, layout hints, and measured output regulation characteristics.
STMicroelectronics VIPER12AS specifications
| Supply Voltage (Vop) | 0 … 50 V |
|---|---|
| Feedback Current (lea) | 3 mA |
| Thermal Resistance Junction‑Case (Rthj‑case) SO‑8 | 25 °C/W |
| Fixed Switching Frequency | 60 kHz |
Source: STMicroelectronics VIPer12ADIP / VIPer12AS Low Power Off-Line SMPS Primary Switcher Handbook
All STMicroelectronics VIPER12AS documents by type
Ratings, dimensions and ordering codes, for selection and design work.
- STMicroelectronics VIPer12ADIP / VIPer12AS Low Power Off-Line SMPS Primary Switcher Handbook 15 p
- ST VIPer12ADIP - E VIPer12AS - E Manual(1) 21 p
- STMicroelectronics VIPer12ADIP / VIPer12AS Datasheet 15 p
- STMicroelectronics VIPer12ADIP VIPer12AS Guide 15 p
- STMicroelectronics ViPer12ADIP/ViPer12AS E Datasheet 21 p
How to use the product for one specific task, with worked examples.
Questions answered in these manuals
What is the main purpose of the presented reference board?
The aim is to propose a solution for a power supply based on an offline discontinuous current mode flyback converter without isolation between input and output.
From: STMicroelectronics AN1934 VIPer12AS Non Isolated Flyback Converter Reference Board Application Note
Which monolithic device is used in the presented circuit?
The circuit is dedicated for building an auxiliary power supply based on the VIPer12AS monolithic device.
From: STMicroelectronics AN1934 VIPer12AS Non Isolated Flyback Converter Reference Board Application Note
What is the fixed switching frequency of the VIPer12ADIP/VIPer12AS?
The device operates at a fixed 60 kHz switching frequency.
From: STMicroelectronics VIPer12ADIP / VIPer12AS Low Power Off-Line SMPS Primary Switcher Handbook
What protection features are included in the VIPer12ADIP?
The device includes over‑temperature, over‑current, and over‑voltage protection with auto‑restart.
From: STMicroelectronics VIPer12ADIP / VIPer12AS Low Power Off-Line SMPS Primary Switcher Handbook
What is the switching frequency of the ViPer12ADIP/AS -E?
The device operates at a fixed switching frequency of 60 kHz.
What supply voltage range does the ViPer12ADIP/AS -E support on the Vpp pin?
The Vpp pin can accept a supply voltage from 0 V up to 50 V.