ACE738D

2A, 24V Synchronous Step-Down Converter

VER 1.1

7

Short Circuit Protection

If a current higher than 3.5

A is detected through TOP FET when it’s on, we consider SW is shorted to

GND. The chip stops switching for few cycles and switch once to check whether SW is still shorted to

GND. This cycle will be repeated until SW is not shorted to GND.

If FB voltage is detected lower than 100mV for few cycles and chip triggers current limit meanwhile, FB

pin is considered shorted to GND. The chip won’t switching unless restart.

Thermal Protection

When the temperature of the ACE738D rises above 140°C, it is forced into thermal shut-down.

Only when core temperature drops below 130°C can the regulator becomes active again.

Application Information

The output voltage is determined by the resistor divider connected at the FB pin, and the voltage ratio is:

Choose R3 around 10kΩ, and then R2 can be calculated by:

The following table lists the recommended values.

R3(kΩ)

R2(kΩ)

2.5

10

17

3.3

10

26.1

5

11

48.4