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

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

Connections

Gerber View

Photos

Video

LT6992-1 Datasheet

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