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What's soft start used for?
Soft start is used for three main reasons:
First, with a very fast output voltage rise time the charging current of the output capacitors (C × dV/dt) can trip your overcurrent circuit or at the very least, cause excessive component stress.
I would say that in off-line ac-dc power supplies the reflection of a high capacitor charging current to the input is rarely a problem. The bulk dc storage capacitor tends to provide the surge current to the output with little effect on the ac input.
Second, soft start helps being up the output voltage in a monotonic way with no overshoot or ringing. By limiting the rate of rise of the output voltage, the error amplifier and compensator stay in equilibrium throughout the turn on process. One way of achieving this is to have a reference voltage that rises with a 1 - exponential characteristic.
Third, there are some logic circuits that require output voltages to rise no faster than a specified minimum rise time and no slower than a specified maximum rise time. Soft start can be used to meet such specifications.
First, with a very fast output voltage rise time the charging current of the output capacitors (C × dV/dt) can trip your overcurrent circuit or at the very least, cause excessive component stress.
I would say that in off-line ac-dc power supplies the reflection of a high capacitor charging current to the input is rarely a problem. The bulk dc storage capacitor tends to provide the surge current to the output with little effect on the ac input.
Second, soft start helps being up the output voltage in a monotonic way with no overshoot or ringing. By limiting the rate of rise of the output voltage, the error amplifier and compensator stay in equilibrium throughout the turn on process. One way of achieving this is to have a reference voltage that rises with a 1 - exponential characteristic.
Third, there are some logic circuits that require output voltages to rise no faster than a specified minimum rise time and no slower than a specified maximum rise time. Soft start can be used to meet such specifications.
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