RDK-399: 12V @ 1A, 85 ~ 265VAC in, Isolated


This report describes a universal input, 12 V, 1 A flyback power supply using a TNY288PG device from the TinySwitch-4 family of ICs. It contains the complete specification of the power supply, a detailed circuit diagram, the entire bill of materials required to build the supply, extensive documentation of the power transformer, along with test data and oscillographs of the most important electrical waveforms.

The board provides a number of user configurable options which are designed to demonstrate the features and flexibility of the TinySwitch-4 family. These include easy adjustment of the device current limit for increased output power or higher efficiency operation, and a latched output overvoltage shutdown.


Manufacturer Power Integrations
Category AC/DC and DC/DC Conversion
Sub-Category AC/DC SMPS - Single Output
Eval Board Part Number 596-1591-ND
Eval Board Supplier Power Integrations
Eval Board -
AC Voltage Universal (115 / 230V)
Outputs and Type 1 Isolated
Voltage Out 12 V
Current Out 1 A
Output Power 12 W
Features Current Limit (Adj. or Fixed)
Energy Standard Compliant
Frequency Jitter for EMI
Open Circuit Protection
Over Voltage Protection
Short Circuit Protection
Shutdown, Enable, Standby
Thermal Protection
Under Voltage Protection, Brown-Out
Efficiency @ Conditions >83%, 115 VAC, 12V @ 0.25 ~ 1 A
>82%, 230 VAC, 12V @ 0.8 ~ 1 A
>81%, 85 VAC, 12V @ 0.1 ~ 1 A
>80%, 265 VAC, 12V @ 0.4 ~ 1 A
No-load Input Power @ Voltage 25 mW @ 230 VAC
Switching Frequency 132 kHz
Internal Switch Yes
Component Count + Extras 34 + 6
Voltage In 85 ~ 265 VAC
Design Author Power Integrations
Application / Target Market Battery Chargers
DVD/Blu-ray Players
Power: Auxiliary Power Supply
Power: Industrial Power
Set-Top Boxes
White Goods
Main I.C. Base Part TNY285
Date Created By Author 2014-07
Date Added To Library 2017-05