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US2076B Datasheet(PDF) 7 Page - Unisonic Technologies

Part No. US2076B
Description  DUAL USB HIGH-SIDE POWER SWITCHDUAL USB HIGH-SIDE POWER SWITCH
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Maker  UTC [Unisonic Technologies]
Homepage  http://www.utc-ic.com
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US2076B Datasheet(HTML) 7 Page - Unisonic Technologies

   
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US2076B
Preliminary
CMOS IC
UNISONICTECHNOLOGIESCO.,LTD
7 of 8
www.unisonic.com.tw
QW-R502-447.a
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.
USB
Controller
USB
Function
USB
Function
CBULK
CBULK
Cable
GND
USB Hub
VBUS
ENA
ENB
FLGA
FLGB
GND
OUTA
OUTB
IN
1
2
3
4
8
7
6
5
USB Peripheral
Figure 3. Inrush Current-Limit Application
US2076B
4.7
µF
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)
ENA
ENB
FLGA
FLGB
OUTA
OUTB
GND
IN
1
2
3
4
5
6
7
8
10k
10k
V+
USB Controller
Figure 4. Transient Filter
Transient Overcurrent Filter
UTC
US2076B
0.1µF
OC


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