PWM generator circuit
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This circuit utilizes a triangle wave generator and comparator to generate a 500 kHz pulse-width modulated (PWM) waveform with a duty cycle that is inversely proportional to the input voltage. An op amp and comparator generate a triangle waveform which is applied to the inverting input of a second comparator. The input voltage is applied to the non-inverting input of this second comparator. By comparing the input waveform to the triangle wave, a PWM waveform is produced. The second comparator is placed in the feedback loop of an error amplifier to improve the accuracy and linearity of the output waveform.

  • 5V Single supply with half-supply reference 
  • Input: -2V to 2V 
  • Output: 0V to 5V

Technical Documents
Application notes (1)
Title Type Size (KB) Date
PDF 178 01 Feb 2019
User guides (1)
Title Type Size (KB) Date
PDF 806 19 Sep 2013
Solution guides (1)
Title Type Size (KB) Date
PDF 11259 18 Feb 2019

Software (1)

Development Tools (2)

Name Part Number Tool Type
Analog engineer's calculator  ANALOG-ENGINEER-CALC  Calculation Tools 
SPICE-based analog simulation program  TINA-TI  Circuit Design & Simulation 

TI Devices (4)

Part Number Name Product Family
OPA2353  Dual high-speed, single-supply, rail-to-rail operational amplifiers MicroAmplifier™ series<  Operational amplifiers (op amps) 
OPA2365  2.2V, 50MHz, Low-Noise Single-Supply Rail-to-Rail Operational Amplifiers  Operational amplifiers (op amps) 
TL1454A  Dual-Channel Pulse-Width-Modulation (PWM) Control Circuit  Step-up (boost) 
TLV3502  4.5ns Rail-to-Rail Comparator  Amplifiers 

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