Figure 1 Analog PWM circuit using triangle wave generator and comparator. In this Design Idea, we show an alternative circuit. It uses very little power, can be implemented in a small silicon area, ...

The circuit in Figure 1 shows a PWM (pulse-width-modulated) ramp generator that you can use in low-cost switch-mode dc/dc power supplies. Its supply voltage can range from 5 to 35V dc, and you can set ...

The PWM generator of the flyback circuit was simulated using Proteus simulation suite. Fig. 13 shows the digital simulation diagram of the PWM generation section.

In the last installment of Circuit VR, we walked around a simplified buck converter. The main simplification was using a constant PWM signal. The result is that the output voltage is a fixed fracti… ...

Two mixed-signal components, a voltage comparator and a digital-to-analog converter (DAC), are added to a normal, timer-based PWM peripheral ().The voltage comparator supplies a shutdown signal to ...

Adding rail-to-rail comparator U3 to the sawtooth from U2 produces a voltage-controlled PWM generator whose voltage input is the non-inverting input of U3 and whose output is the output of U3. If a ...

BTW, replacing the op-amp with a comparator would allow a mostly-digital loop, with its output controlling the direction of an up-down counter that sets the mark length within an all-digital PWM.

With a competent PWM generator on a microcontroller, you can create this carrier modulation easily enough yourself. Set the PWM frequency to 38 kHz and the duty cycle somewhere in the 33%-50% ...