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User's Guide

SLUU430C–July 2010–Revised May 2011

A 230-VAC TRIAC Dimmable 6-W LED Driver

1 Introduction

The TPS92010EVM-631 is a TRIAC dimmable LED driver. It can provide 0.325-A constant current to four

or five high-brightness LED’s. The EVM includes a five-LED load. It is powered from the mains which is

rated at 185 V

RMS

to 265 V

RMS

. The output current can be modified for constant levels from 0.2 A to 0.7 A.

2 Description

This EVM uses the TPS92010 high-efficiency offline LED lighting driver controller. The power topology is a

quasi resonant mode flyback. This makes for a cost competitive solution. This TPS92010 EVM

implements a constant current, high-efficiency, low-ripple AC-DC LED lighting driver

Current sensing is done directly via a resistor and op-amp. This in turn drives an opto-coupler which sets

the PWM pulses via the TPS92010 to control the output current at a constant level. The design also

incorporates a circuit to ensure compatibility with a large number of commonly available TRIAC based

dimmers. This circuit monitors the line voltage for TRIAC operation. Then the TRIAC is operating the line

voltage is chopped. This information is used by the circuit to reduce the constant output current level thus

dimming the LED’s. It also applies a current path at the input to ensure the TRIAC triggers correctly.

2.1 Typical Applications

• Household Light Bulb Replacement

2.2 Features

• TRIAC Compatible Dimming

• Low Cost Line Powered LED Driver Solution

• Includes Five HB-LED’s as a Sample Load

• Allows Easy Use of Users Own LED Load

• Test Points for LED Voltage and Current

• Accurate Current Sensing to Maintain Constant Current to LED’s

• Modifiable Output Current from 0.2 A to 0.7 A, 0.325 A is Default

3 Electrical Performance Specifications

Table 1. Electrical Performance Specifications

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

Input Characteristics

Voltage range

(1)

185 265 V

RMS

Maximum input current 0.53 A

RMS

Output Characteristics

Output voltage, V

OUT

14 17 V

Output load current, I

OUT

Input voltage = 200 VAC to 265 VAC 0.31 0.325 0.34 A

Systems Characteristics

Efficiency 85%

(1)

Input voltages below 200 VAC may result in reduced output current.

A 230-VAC TRIAC Dimmable 6-W LED Driver SLUU430C–July 2010–Revised May 2011

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