US2076AG-S08-R Ver la hoja de datos (PDF) - Unisonic Technologies

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US2076AG-S08-R

DUAL USB HIGH-SIDE POWER SWITCH

Unisonic Technologies 

US2076A

Preliminary

CMOS IC

„ APPLICATIONS INFORMATION (Cont.)

In Figure 3, the soft start circuit is shown, and the soft start circuit can be utilized to meet USB transient regulation

specifications with large load capacitances (CBULK >10µF). The device will provide inrush current limiting for these

applications.

VBUS

USB Hub

US2076A

1 ENA

2 FLGA

4.7 3

µF

FLGB

4

ENB

8

OUTA

IN 7

6

GND

OUTB 5

USB

Controller

CBULK

USB

Function

USB

Function

GND

Cable

USB Peripheral

CBULK

Figure 3. Inrush Current-Limit Application

If an inrush current which is from the connection of a heavy capacitive load, the inrush current may cause the fault

flag to fall for a short duration, while the switch is in a constant-current mode, or charging the capacitance. In that

case, to protect this circuit from damage due to erroneous overcurrent reporting, the fault flag circuit can be in series

with a simple 1ms RC low-pass filter (see Figure 4)

Transient Overcurrent Filter

V+

USB Controller

OC

10k

10k

0.1µF

UTC

US2076A

1 ENA

2

FLGA

3 FLGB

OUTA 8

IN 7

GND 6

4 ENB OUTB 5

Figure 4. Transient Filter

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

7 of 8

QW-R502-446.a

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