This three-part series describes how to properly test a DC/DC power supply, and ensure that it works reliably over various operating conditions.

There wasn’t anything obviously wrong with it. A bit of probing and comparison to one of the good modules, however, finally revealed a failed resistor in the soft start circuit.

In soft-start mode, an external power switch’s output current and the power supply’s output voltage ramp up at a rate controlled by, and proportional to, the voltage at the COMP pin. Figure 1 shows a ...

Isolated dc-dc converters are prone to excessive in-rush current, but a small soft-start circuit can solve the problem and limit that current.

This type of linear power supply has an extremely simple circuit consisting of a transformer, bridge rectifier, and capacitors.

Under start-up conditions the increased voltage drop that results can trigger the power supply under-voltage lockout mechanism.

In this case, implementing soft-start is more complicated, because the routine must provide current limitation throughout the whole start-up process until the required output voltage is reached. This ...

For example, it first-rated soft-start circuits, a huge amount of solid capacitors and continuous active clamp forward switching technology combined with the DC to DC VRMs circuit design and more.