Linear Current Source LED Driver with Dimmer Input

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.

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

Connections

Gerber View

Photos

Video

TLD1211 Datasheet

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