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Up to 6 white LED drivers based on STLA02 for display backlighting

STEVAL-TLL010V1

Overview

The STEVAL-TLL010V1 demonstration board is based on the STLA02, a boost converter dedicated to powering and controlling the current of white LEDs in an LCD backlight. The device operates at a typical constant switching frequency of 2.3 MHz. It steps an input voltage ranging from 2.5 V to 18 V, up to 27 V. The output current is adjustable by the resistor RFB connected between the V_OUTand FB pins. The STLA02 device contains high-side sensing to simplify the PCB layout in terms of LED connection.

The output current is dimmable by the PWM signal applied to the EN pin with minimum PWM frequency equal 100 Hz.

Main features

Boost DC-DC converter
Drives up to 6 LEDs with a total current up to 20 mA
Output power capability up to 500 mW
Input voltage range 2.5 V to 18 V
Output current control
2.3 MHz switching frequency

PWM input for the output current dimming with 300:1 dimming range
350 mA integrated switch
Overvoltage protection
Chip overtemperature detection and protection
Soft-start implemented
RoHS compliant

Design Files

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Update:2025-05-20 02:12:11

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