24V Input 700mA Output Buck Regulator LED Driver - Reference Design
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The PMP10596 reference design is an LED driver based on SIMPLE SWITCHER® LM46002 buck regulator. The driver board takes 24V +/-25% input voltage and supplies700mA output current to drive up to 4 LEDs in series. The LM46002 is a 60V, 2A synchronous buck regulator with integrated FETs, and in this design it is configured as a high efficiency constant current converter. This is accomplished by using the voltage across a current sense resistor as the feedback signal. To reduce the sense resistor power loss, a 2V voltage reference is used to bias the FB pin via a resistor network, and, as a result, the equivalent feedback reference voltage becomes 0.35V, lower than the 1V feedback of the LM46002. The reference board employs 3 dimming schemes, which allows the output current to be adjusted via the potentiometer, an analog voltage or a PWM signal. It also offers easy and flexible control to dim the LED brightness and adds output overvoltage protection from LED open-circuit failure.


• 24V +/-25% input voltage range, drive up to 4 LEDs
• 94% efficiency driving 4 LEDs
• Simple voltage bias circuit to reduce sense resistor lost
• 3 flexible dimming options
• LED open circuit protection
• This circuit board is tested, and the design files and test report are included.

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Design Files

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(Output Voltage 1)
Vin (Min) (V)18
Vin (Max) (V)30
Vout (Nom) (V)16
Iout (Max) (A).7
Output Power (W)11.2
Input TypeDC
TopologyBuck- Synchronous

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM4040-N  100-ppm/°C precision micropower shunt voltage reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
LM46002  3.5V to 60V, 2A Synchronous Step-Down Voltage Converter  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM4040-N Download Download
Download Download
Download Download
LM46002 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 448 27 Jan 2015
Design files (4)
Title Type Size (KB) Date
ZIP 286 27 Jan 2015
PDF 526 27 Jan 2015
PDF 92 27 Jan 2015
PDF 227 27 Jan 2015

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