STEVAL-TLL011V1 Datasheet, PDF (1/4 Pages) STMicroelectronics – Chip overtemperature detection and protection

STEVAL-TLL011V1
Driver for up to 40 white LEDs for mid-sized LCD display backlight
based on the STLD41
Data brief
Features
■ Boost DC-DC converter
■ Drives up to 40 LEDs (4 strings of 10) with a
total current up to 120 mA
■ Input voltage range: 3.0 V to 21 V
■ Output current control
■ 1.8 MHz fixed frequency PWM control
■ PWM input for output current dimming with a
frequency range of 25 kHz - 50 kHz
■ 2 A integrated switch
■ Overvoltage protection
■ Chip overtemperature detection and protection
■ Less than 1 µA standby current
■ Soft-start function
■ RoHS compliant
Description
The STEVAL-TLL011V1 demonstration board
demonstrates the performance of the STLD41, a
boost converter that operates from 3.0 V to 21 V
and which can provide an output voltage as high
as 38 V.
It can drive up to 40 white LEDs connected in 4
strings of 10 LEDs in series. The total output
current capability is 120 mA at an output voltage
of 38 V.
Regulation is performed by the internal error
amplifier which works with the feedback voltage
from the sensing resistor.
The device can be turned ON/OFF by way of the
logic signal connected to the EN pin.
The LEDs can be dimmed by applying a PWM
signal to the PWM input.
May 2012
Doc ID 023189 Rev 2
For further information contact your local STMicroelectronics sales office.
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