RDK-91: 12W, 12V @ 1A, 85 ~ 265VAC


This kit includes a universal input, 12 V, 1 A flyback power supply using a TNY278P device from the TinySwitch-III 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-III 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 596-1194-ND
Eval Board Supplier Power Integrations
Eval Board -
AC Voltage 115 V
230 V
Universal (115 / 230V)
Outputs and Type 1 Isolated
Voltage Out 12 V
Current Out 1 A
Output Power 12 W
Features Frequency Jitter for EMI
Short Circuit Protection
Shutdown, Enable, Standby
Thermal Protection
Under Voltage Protection, Brown-Out
Efficiency @ Conditions >78%, 230V in, 12V @ 0.5 ~ 1 A
>78%, 115 VAC, 12V @ 0.5 ~ 1 A
No-load Input Power @ Voltage 28 mW @ 115 V (w/ Bias)
38 mW @ 230 V (w/ Bias)
65 mW @ 115 V (w/o Bias)
120 mW @ 230 V (w/o Bias)
Switching Frequency 132 kHz
Internal Switch Yes
Component Count + Extras 27 + 5
Voltage In 85 ~ 265 VAC
Design Author Power Integrations
Application / Target Market AC Adapters
Battery Chargers
Main I.C. Base Part TNY278
Date Created By Author
Date Added To Library 2020-05

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