24V Input 700mA Output Buck Regulator LED Driver - Reference Design


Design files


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.

Output voltage options PMP10596.1
Vin (Min) (V) 18
Vin (Max) (V) 30
Vout (Nom) (V) 16
Iout (Max) (A) .7
Output Power (W) 11.2
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck- Synchronous

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU760.PDF (516 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers

TIDC889.ZIP (286 K)

Design file that contains information on physical board layer of design PCB


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

LM460023.5V to 60V, 2A Synchronous Step-Down Voltage Converter

Data sheet document-pdfAcrobat PDF open-in-new HTML
Shunt voltage references

LM4040-N100-ppm/°C precision micropower shunt voltage reference

Data sheet document-pdfAcrobat PDF

Technical documentation

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Type Title Date
Test report PMP10596 Test Results Jan. 27, 2015

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