User manual

User's Guide

SLUU897– March 2012

Dimmable LED Lighting Driver Controller

1 Introduction

The TPS92001EVM-628 evaluation module is a constant-current, dimmable LED driver. It is designed to

drive 9 LEDs at 330 mA and is rated for an AC input of 105 V

RMS

to 135 V

RMS

2 Description

The TPS92001/2 family of general LED lighting PWM controllers contains control and drive circuitry

required for off-line isolated or non-isolated LED lighting applications. The TPS92001EVM-628 evaluation

module uses the TPS92001 as a non-isolated buck controller; more specifically it is an inverting buck

topology. The controller operates in fixed-frequency, current-mode switching with minimal external parts

count. In LED illumination applications there is typically no need for the LED load to be referenced to

ground. This utilizes the inverted buck which moves the controller and FET to the low side of the circuit,

referenced to the lowest voltage, while the LED load is floated (referenced to the highest voltage). With an

appropriately designed bias regulator for the controller, we can now use a much lower voltage controller

which is more economical.

2.1 Typical Applications

• Commercial/Household LED Lighting

2.2 Features

• Dimmable, Non-Isolated LED Driver with Minimum External Part Count

• Wide-Duty Cycle Range for Wide-Input Voltage

• Convenient 5-V Reference Output

• Test Points for Output Voltage/Current

3 Electrical Performance Specifications

Table 1. TPS92001EVM-628 EVM-001 Electrical Performance Specifications

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

Input Characteristics

Voltage range 105 120 135 V

Maximum input current 115 mA

Output Characteristics

Output voltage, V

OUT

26 30 34 V

Output load current, I

OUT

280 330 380 mA

Output current ripple VIN = 120 VAC 280 mA

Output over voltage 36 V

Systems Characteristics

Switching frequency 133 kHz

Full load efficiency VIN = 120 VAC 85%

Power factor 0.90

Dimmable LED Lighting Driver Controller SLUU897– March 2012

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