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Linear Current Source LED Driver with Dimmer Input

  • Rajkumar Sharma
  • 72 Views
  • easy
  • Tested
  • SKU: EL136285
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The compact module shown here is a linear current source for LED driver and it’s ideal for automotive LED lighting applications. The project is built using a TLD1211 chip from Infineon. The board provides supply to LEDs under the severe condition of automotive applications resulting in constant brightness and extended LED lifetime. The project is capable to drive high current, high brightness LEDs. The circuit features overload, short circuit, over-voltage, and over-temperature protections. It also has the option to control the LED brightness control by an external PWM signal.

The project can provide an output current of up to 2.5A. You will need to choose the appropriate booster transistor Q1 and sunt resistor R5 to achieve this output. Please refer to the datasheet of the chip for more info.

Dimmer: LED brightness control is possible with an external PWM signal. In this case, you can use the enable pin to feed a PWM signal to control the brightness of the LED. For full current/full brightness apply 5V to Enable Pin or change resistor R1 to 12K and connect it to a 24V LED supply to enable the output.

Features

  • Operating Voltage 8 to 24V (Maximum 28V)
  • Load Current 300mA
  • Constant Current Output
  • Enable Input for PWM Brightness or ON/OFF
  • Over Voltage Protection
  • Very low Standby Current
  • PCB Dimensions 36.04 x 22.54mm
  • 2 x 2.5mm Mounting Holes

Connections and Other Details

  • CN1: Pin 1,2 = VCC, Pin 3, 4 = GND
  • CN2: Pin 1 = Enable or PWM Enput, Pin 2 = GND
  • CN3: Pin 1, 2 = +LED , Pin 3,4 = -LED

Schematic

Parts List

NO.QNTY.REF.DESCMANUFACTURERSUPPLIERSUPPLIER'S PART NO
12CN1,CN34 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5317-ND
21CN22 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5315-ND
31C1100nF/50V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
41C210uF/35V CERAMIC SMD 1206 OR 1210YAGEO/MURATADIGIKEY
51Q1MJD3055ONSEMIDIGIKEYMJD3055-ND
61R11.8K 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
71R21K 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
81R3820E 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
91R4100E 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
101R50.5E/2W 1% SMD SIZE 2512YAGEO/MURATADIGIKEY
111U1TLD1211 SOIC8INFINEONDIGIKEYTLD1211SJFUMA1TR-ND

Connections

Gerber View

Photos

Video



TLD1211 Datasheet

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