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DER-048: 12V @ 100mA / 15V @ 25mA, 85 ~ 265VAC in

Summary

This document is an engineering prototype report describing a universal input dual output Flyback converter providing an isolated and non-isolated output voltage for a motor application employing the LNK304P.

The document contains the power supply specification, schematic, bill-of-materials, transformer documentation, printed circuit layout, and performance data.

LinkSwitch-TN is specifically designed to replace all linear and capacitor-fed (cap dropper) non-isolated power supplies in the under 360 mA output current range at equal system cost while offering much higher performance and energy efficiency.

LinkSwitch-TN devices integrate a 700 V power MOSFET, oscillator, simple On/Off control scheme, a high-voltage switched current source, frequency jittering, cycle-by-cycle current limit and thermal shutdown circuitry onto a monolithic IC. The start-up and operating power are derived directly from the voltage on the DRAIN pin, eliminating the need for a bias supply and associated circuitry in buck or flyback converters. The fully integrated auto-restart circuit in the LNK304-306 safely limits output power during fault conditions such as short-circuit or open loop, reducing component count and system-level load protection cost.

A local supply provided by the IC allows use of a non-safety graded optocoupler acting as a level shifter to further enhance line and load regulation performance in buck and buck-boost converters, if required.

Specifications

Manufacturer Power Integrations
Category AC/DC and DC/DC Conversion
Sub-Category AC/DC SMPS - Multi Output
Eval Board -
AC Voltage 115 V
230 V
Universal (115 / 230V)
Outputs and Type 1 Isolated + 1 Non
Voltage Out: Highest Current First 12V, 15V
Current Out 100mA, 25mA
Output Power 1.6 W
Efficiency @ Conditions >70%, 105 ~ 265 VACin
No-load Input Power @ Voltage 100 mW @ 230 VAC
Features Current Limit (Adj. or Fixed)
Open Circuit Protection
Short Circuit Protection
Thermal Protection
Switching Frequency 66 kHz
Internal Switch Yes
Component Count + Extras 19 + 0
Voltage In 85 ~ 265 VAC
Application / Target Market Motor Control
Design Author Power Integrations
Main I.C. Base Part LNK304
Date Created By Author 2005-04
Date Added To Library 2014-06

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