Data Sheet S14288EJ1V0DS

9

µµµµPD16876

3. Behavior When Power Is Turned ON/OFF

This IC performs a soft-start operation on power application.

This is to prevent an overcurrent from flowing

through the IC on power application while the high-capacity capacitor connected to the output pin is charged.

Power ON:

Soft start (2.5 to 8 ms)

Power OFF:

No control (10

µs MAX.)

5 V

Vin

10

s MAX.

2.5 ms MIN.

8 ms MAX.

µ

Vout

0 V

0 V

5 V

The above figure does not show the actual waveform. For the related characteristic waveform, refer to Major

Characteristic Curves.

4. Output Latch Functional Change

LATCH = “H”: This IC has the control terminal (LATCH terminal) which latches the output current limitation after

over current detection.

An output latch function is explained below.

The output switch is turned off irrespective of the state of a CTL terminal after over current

detection.

Again, in order to make a switch into an ON state, it is necessary that a CTL terminal is setting to

Low level.

This function can be used, when you want to make a CTL terminal “L” fixation and to always

consider as an ON state, or when a USB controller to switch-ON/OFF control is unnecessary.

LATCH = “L”: A current limitation circuit operates after over current detection.

A limitation function is continued until the over current is eliminated.

After current detection, when abnormal condition is eliminated, output returns to an ON state.

This function serves as specification which suited USB specification.