Driver for up to 40 white LEDs for mid-sized LCD display backlight based on the STLD41

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.

Key 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

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Design

Technical Documentation

Product Specifications
Description Version Size
DB1654 DB1654: Driver for up to 40 white LEDs for mid-sized LCD display backlight based on the STLD41 2.0 215 KB

Hardware Resources

Board Manufacturing Specifications
Description Version Size
STEVAL-TLL011V1 gerber files 1.0 64 KB
Bill of Materials
Description Version Size
STEVAL-TLL011V1 BOM 1.0 8 KB
Schematic Packs
Description Version Size
STEVAL-TLL011V1 schematics 2.0 63 KB

Legal

License Agreement
Description Version Size
Evaluation products license agreement 1.0 125 KB
Support & Community
Related Applications

Sample & Buy

Part Number Core Product Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
STEVAL-TLL011V1 STLD41 Active 89.43 1 NEC EAR99 ITALY MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
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(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STEVAL-TLL011V1 ActiveCARDIndustrialEcopack2
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(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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