ST Life.augmented


White LED Controller based on STLD40D
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This evaluation board is based on the STLD40D that is a boost converter that operates from 3.0 V to 5.5 V and can provide an output voltage as 37 V and can drive up to 10 white LEDs in series. The converter is a PFM (pulse frequency modulation) inductor switches and can work in discontinuous (DCM) mode operation. A minimum OFF time of the embedded boost switch TSW is fixed internally and allows limiting the switching frequency. The output current capability is 20 mA with an output voltage of 37 V. The regulation is done by sensing the led current through the resistor RLED. The device can be turned ON/OFF through the logic enable signal pin EN. Applying a low frequency PWM signal the LEDs can be dimmed. The maximum peak inductor current can be programmed.

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Errata Sheet
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Data Brief

Key Features

  • Inductor switches boost controller
  • PFM mode control
  • High efficiency over wide range of input voltage from 3.0 V to 5.5 V
  • Over-voltage protection with automatic restart
  • Adjustable peak current limit
  • Enable pin with possibility of PWM dimming control
  • Low shutdown current <1 μA


Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB0707: White LED controller evaluation board based on the STLD40D
1.1 61 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
STEVAL-TLL001V1 gerber files
1.0 154 KB

Bill of Materials

Description Version Size
2.1 7 KB

Schematic Pack

Description Version Size
Board schematic
1.0 13 KB

License Agreement

Description Version Size
Evaluation products license agreement
1.0 126 KB

Sample & Buy

Part Number Marketing StatusCore ProductOrder From STUnit Price (US$)*
@ 1
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STEVAL-TLL001V1ActiveSTPS1L40MBuy Direct35.52Distributor reported inventory date: 2016-02-12
Distributor NameRegionStockMin. order
Newark Element14Order NowAMERICA10

(*) 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
(**) The Material Declaration forms available on 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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