describe

This verification design uses triangular wave generator and comparator to generate pulse width modulation (PWM) waveform, and the duty cycle of this waveform is inversely proportional to the input voltage. The operational amplifier and comparator generate a triangular waveform, which is then transmitted to an input of the comparator. By transferring the input voltage to other comparator inputs, a PWM waveform will be generated. The negative feedback of PWM waveform to error amplifier is used to ensure high accuracy and linearity of output. Opa2365 operational amplifier, tlv3502 comparator and ref3325 benchmark are used in this design.

characteristic

Triangular wave generator and comparator are used to generate PWM waveform

Single power solution

-2V to 2V input, DC coupled

5V, 500KHz PWM output

0.22% measurement gain error

0.108% measurement bias error

Schematic / block diagram

Design circuit diagram of analog PWM generator: 5V 500KHz PWM output

Design circuit diagram of analog PWM generator: 5V 500KHz PWM output

Design circuit diagram of analog PWM generator: 5V 500KHz PWM output

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