Low-Cost LED Dimmer using LM3578

  • Rajkumar Sharma
  • 43 Views
  • easy
  • Tested
  • SKU: EL123601
  • Quote Now

This Low-cost LED dimer project includes two main parts, an LM3578 chip, and a MOSFET. The LM3578 generates a PWM signal, and Q1 MOSFET helps to drive a high current LED. The project also includes current limit feature. Over current trigger point is set to 1.1A. LED intensity can be set using a board trimmer potentiometer. The compact and low-profile circuit occupies a very small area. PCB has the option to mount DIP8 IC or SOIC8 IC.

Note: Read the datasheet of LM3578 to alter the PWM Duty Cycle, Current Limit, Operating PWM Frequency etc.

Connections

  • CN1: Pin 1 + Pin 2 = VCC and Pin 3 + Pin 4 = GND
  • CN2: Pin 1 + Pin 2 = VCC and Pin 3 + Pin 4 = -Load
  • PR1: Trimmer Potentiometer to adjust the LED Light Intensity

Features

  • Supply 12V DC
  • Load Up to 1Amp (1 to 10W – 12V LED)
  • Over Current Limit 1.1A
  • PWM Duty Cycle 0 to 80%
  • PWM Frequency 10Khz
  • On Board Power LED
  • PCB Dimensions 47.94 x 15.56mm

Schematic

Parts List

NO.QNTY.REFDESC.MANUFACTURERSUPPLIERPART NO
11CN14 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5317-ND
21CN24 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5317-ND
31C110uF/25V SMD SIZE 1210 OR 1206YAGEO/MURATADIGIKEY
41C21KPF SMD SIZE 0805YAGEO/MURATADIGIKEY
51C320PF SMD SIZE 0805YAGEO/MURATADIGIKEY
61C410K PF 0.01uF SMD SIZE 1206 OR 1210YAGEO/MURATADIGIKEY
71D1LED-PWRLITE ON INCDIGIKEY160-1427-1-ND
81PR1250K TRIMMER POTENTIOMETERCTS ELECTROCOMPONENTSDIGIKEY262UR254B-ND
91Q1FDD8876ON SEMIDIGIKEYFDD8876CT-ND
102R1,R71K 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
111R2120K % SMD SIZE 0805YAGEO/MURATADIGIKEY
121R3100K 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
131R4200E 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
141R50.1E/2W 1% SMD SIZE 2512YAGEO/MURATADIGIKEY
151R61E 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
161U1LM3578 DIP 8 OR SOIC8TIMOUSER926-LM3578AN/NOPB
PCB accepts DIP8 or SOIC8 for U1

Connections



Gerber View

Photos

 

Video


LM3578 Datasheet

lm3578a

PCB

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