Voltage-Controlled Pulse Width Modulator (PWM) – PWM Signal Generator

  • Rajkumar Sharma
  • 1117
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  • easy
  • Tested

This is an easy-to-use voltage to PWM converter. The project occupies very little space.  The circuit is built using the versatile silicon timing device LT6992-1 chip. Pulse Width Modulation (PWM) Controlled by Simple 0V to 1V Analog Input, multiturn trimmer potentiometer provided to adjust the duty cycle 0 to 100 %. The circuit also has provision to set the frequency to 2.65Khz, 7.8Khz, 10.7Khz or 15.7Khz using jumper J1 and J2. Circuit operates with a 5V Supply.  D1 is a power LED, all connections are made easy using the 3 pin male header connector CN1. This is a very useful tool as test gear or to drive various circuits that require a PWM signal. The output frequency is very accurate and steady has 1.7% Maximum Frequency Error. CMOS Output Driver Sources/Sinks 20mA

Frequency Setting (Jumper J1 and J2)

  • J1-Open, J2 Open = 2.65KhZ
  • J1-Closed, J2-Open=10.4KHZ
  • J1-Closed, J2-Closed=15.7Khz
  • J1-Open, J2 Closed=7.8Khz

Duty Cycle: Duty Cycle is adjustable 0 to 100 % using Multiturn Trimmer Potentiometer PR1. The duty cycle can also be controlled using external analog voltage, remove PR1 and use GND pin and middle pin of trimmer pot, to apply 0 to 1V to output PWM 0 to 100%.

Power Input: Circuit operates with 5V DC power supply and consumes 10mA current

Application

  • PWM Servo Loops
  • Heater Control
  • DC Motor speed control
  • LED Dimming Control
  • High Vibration, High Acceleration Environments
  • Portable and Battery-Powered Equipment

Schematic

Parts List

NO.QNTY.REF.DESC.MANUFACTURERSUPPLIERSUPPLIER PART NO
11CN13 PIN MALE HEADER PITHC 2.54MMWURTHDIGIKEY732-5316-ND
21C10.1uF/50V SMD SIZE 0805MURATA/YAGEODIGIKEY
31C210uF/16V SMD SIZE 1206MURATA/YAGEODIGIKEY
41D1LED RED SMD SIZE 0805LITE ON INCDIGIKEY160-1427-1-ND
52J1,J22 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5315-ND
61PR15K TRIMMER POTBOURNS INCDIGIKEY3299W-502LF-ND
71R120K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
81R21M 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
91R31K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
101R4100K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
111R6300K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
121R7280K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
131U1LTC6992-1ANALOGDIGIKEY161-LTC6992IS6-1#TRPBFCT-ND
142J1,J2SHUNTSULLINS CONNECTORDIGIKEYS9001-ND
151R5150K 1% SMD Size 0805MURATA/YAGEODIGIKEY

Connections

Gerber View

Photos

Video

LT6992-1 Datasheet

LTC6992-1-6992-2-6992-3-6992-4

PCB

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