Analog PWM Generator 5V, 500kHz PWM Output
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Key Document


This Verified Design utilizes a triangle wave generator and comparator to generate a pulse-width-modulated (PWM) waveform with a duty cycle that is inversely proportional to the input voltage. An op amp and comparator generate a triangular waveform which is passed to one input of a comparator. By passing the input voltage to the other comparator input, a PWM waveform is produced. Negative feedback of the PWM waveform to an error amplifier is utilized to ensure high accuracy and linearity of the output. The OPA2365 op amp, TLV3502 comparator, and REF3325 reference were used to build this design. See more TI Precision Designs

  • Utilizes a triangle wave generator and comparator to generate PWM waveform
  • Single-Supply Solution
  • -2V to 2V input, DC coupled
  • 5V, 500kHz PWM output
  • 0.22% Measured Gain Error
  • 0.108% Measured Offset Error
This Verified Design Includes:
  • Theory
  • Component Selection
  • TINA-TI Simulation
  • Schematics and PCB Layout
  • Verification and Measured Performance
  • Modification Options

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Design Files

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TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
OPA2365  2.2V, 50MHz, Low-Noise Single-Supply Rail-to-Rail Operational Amplifiers  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
REF3325  2.5-V, 30-ppm/°C drift, 3.9-µA, 3-pin SOT-23, 3-pin SC70, 8-pin UQFN voltage reference  Voltage references  Sample & Buy Not Available
TLV3502  4.5ns Rail-to-Rail Comparator  Amplifiers  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
OPA2365 Download Download
REF3325 Download Download
Download Download
Download Download
TLV3502 Download Download
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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 806 19 Sep 2013
Design files (4)
Title Type Size (KB) Date
PDF 61 20 Sep 2013
ZIP 795 19 Sep 2013
PDF 89 19 Sep 2013
ZIP 889 19 Sep 2013
Related Tools & Software

Design tools & simulation (1)

Name Part Number Tool Type
SPICE-based analog simulation program  TINA-TI  Simulation tools 

Software development (1)

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