login
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
| NO. | QNTY. | REF. | DESC. | MANUFACTURER | SUPPLIER | SUPPLIER PART NO |
|---|---|---|---|---|---|---|
| 1 | 1 | CN1 | 3 PIN MALE HEADER PITHC 2.54MM | WURTH | DIGIKEY | 732-5316-ND |
| 2 | 1 | C1 | 0.1uF/50V SMD SIZE 0805 | MURATA/YAGEO | DIGIKEY | |
| 3 | 1 | C2 | 10uF/16V SMD SIZE 1206 | MURATA/YAGEO | DIGIKEY | |
| 4 | 1 | D1 | LED RED SMD SIZE 0805 | LITE ON INC | DIGIKEY | 160-1427-1-ND |
| 5 | 2 | J1,J2 | 2 PIN MALE HEADER PITCH 2.54MM | WURTH | DIGIKEY | 732-5315-ND |
| 6 | 1 | PR1 | 5K TRIMMER POT | BOURNS INC | DIGIKEY | 3299W-502LF-ND |
| 7 | 1 | R1 | 20K 1% SMD SIZE 0805 | MURATA/YAGEO | DIGIKEY | |
| 8 | 1 | R2 | 1M 1% SMD SIZE 0805 | MURATA/YAGEO | DIGIKEY | |
| 9 | 1 | R3 | 1K 1% SMD SIZE 0805 | MURATA/YAGEO | DIGIKEY | |
| 10 | 1 | R4 | 100K 1% SMD SIZE 0805 | MURATA/YAGEO | DIGIKEY | |
| 11 | 1 | R6 | 300K 1% SMD SIZE 0805 | MURATA/YAGEO | DIGIKEY | |
| 12 | 1 | R7 | 280K 1% SMD SIZE 0805 | MURATA/YAGEO | DIGIKEY | |
| 13 | 1 | U1 | LTC6992-1 | ANALOG | DIGIKEY | 161-LTC6992IS6-1#TRPBFCT-ND |
| 14 | 2 | J1,J2 | SHUNT | SULLINS CONNECTOR | DIGIKEY | S9001-ND |
| 15 | 1 | R5 | 150K 1% SMD Size 0805 | MURATA/YAGEO | DIGIKEY |
Connections
Gerber View
Photos
Video
LT6992-1 Datasheet
PCB
