UPD16855BC 查看數據表（PDF） - NEC => Renesas Technology

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UPD16855BC

DUAL HIGH-SIDE SWITCH FOR USB APPLICATION

NEC => Renesas Technology 

µPD16855

FUNCTION DESCRIPTION

1. Over current detection

The specification of over current detect is 0.6 to 1.25 A (typ. 900mA) in this IC. (500 mA max. in USB standard)

This function is that flag-pin turns to Low-level and reports to the USB controller when over current is detected.

At this time, output of IC is operated as followed.

• µPD16855A/B : Output keep ON-state and over current limited circuit is operated. This function can be

prevented from being long-time over current state.

• µPD16855C/D : Output turns to off, and isn't based on the state of CTL-pin.

When CTL-pin turns to non-active, FLG-pin returns to High-level and Output-pin turn to OFF-state.

Immediately the controller should be inputted non-active level to CTL-pin after detecting FLG = “L” not to reach to

the state of thermal shutdown.

Then, in the case of FLG-pin is High-level and CTL-pin is active level, Output-pin turns to ON-state.

To prevent from detecting wrongly the current to the moment, over current detect delay time is set up.

This delay time is 10 µs (typ.).

Power consumption in this device increases rapidly at the time of current-limitter circuit operation, and channel

temperature Tch is likely to escalate. Make a CTL signal non-active, and make switch turn off before Tch of this

device exceed absolute maximum rating.

5V

Flg

0V

Vout

Iout

0A

Normal Mode

more than 10 µ s (typ.)

Controlled by CTL-pin ( µ PD16855A/B)

Instant Switch off (µ PD16855C/D)

Over current detect threshold

5V

Flg

0V

in case of current surge

1 A~

Iout

0.5 A

less then 10 µ s (typ.)

connection to the

moment, it flow

µ PD16855 the large current USB Device

IN

OUT

+

10

Data Sheet S13020EJ1V0DS00

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