Is DAC or PWM better for load control?

Question

Electronics

To control the load in the form of a heater, which is better built-in DAC, PWM or DAC derived from PWM with rc filter? What is the advantage of a shim over a dac?

Answer 1

The system with the heater is very inertial, and is perfectly controlled by PWM.
In the case of PWM, the transistor in the load circuit operates in the key mode, and there are very small losses on it.
In the case of a DAC, the transistor operates in a linear mode and, accordingly, there are large losses on it.
PWM with RC filter:
If the filter is in the load control circuit, then this is a simplified replacement for the DAC, where it is needed, but it is not. This is not your case.
If in the load circuit, then this, in your case, is just extra losses on the filter, because. the inertia of the heater serves as a filter here.

Answer 2

The heater does not need PWM or DAC, but PID.
Because You will not normally warm up the heater with a PWM, but with a DAC instead of a heater you will heat the transistor, PID control is ideal for the heater.