DER-424: 180mA @ 48V Max, 90 ~ 265VAC in


This engineering report describes the design for a universal input, 22 V to 48 V, 180 mA LED driver. This power supply utilizes the LYT2004E device from the Power Integrations LYTSwitch-2 family.

This document contains the power supply and transformer specifications, schematics, bill of materials, and typical performance characteristics pertaining to this power supply.

The LYTSwitch-2 family of ICs dramatically simplifies low power CC LED drivers by eliminating the optocoupler and secondary control circuitry. The family introduces a revolutionary control technique to provide accurate output current regulation, compensating for transformer and external component variations, and device parameter tolerances as well as input voltage variations.

The device incorporates a high-voltage switching MOSFET, a novel ON/OFF control state machine, a high-voltage switched current source for self-biasing, frequency jitter to reduce EMI, cycle-by-cycle current limit and hysteretic thermal shutdown circuitry into a monolithic IC. This high level of integration enables highly cost-effective designs with very few external components, reducing solution cost and driver size.


Manufacturer Power Integrations
Category Lighting
Sub-Category LED Drivers - AC / Offline
Eval Board -
AC Voltage 115 V
230 V
Outputs and Type 1 Isolated
Current Out 180 mA
Voltage Out (Max) 48 V
Efficiency @ Conditions >86.3%, 195 ~ 265 VACin, @ 48 VLED
>86.2%, 170 ~ 265 VACin, @ 42 VLED
>85%, 180 ~ 265 VACin, @ 36 VLED
>85%, 172 ~ 265 VACin, @ 30 VLED
>84.7%, 165 ~ 265 VACin, @25 VLED
>84.2%, 160 ~ 265 VACin, @ 22 VLED
Features Current Limit (Adj. or Fixed)
Frequency Jitter for EMI
Open Circuit Protection
Short Circuit Protection
Thermal Protection
Under Voltage Protection, Brown-Out
Switching Frequency 85 kHz
Component Count + Extras 25 + 5
Design Author Power Integrations
Application / Target Market Ballast, Electronic
Voltage In 90 ~ 265 VAC
Power Factor
Main I.C. Base Part LYT2004

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