IMP2524-1BN 查看數據表（PDF） - A1 PROs co., Ltd.
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IMP2524-1BN Datasheet PDF : 32 Pages
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IMP2525
Application Information
VBUS
USB Hub
GND
IMP2525-2
1
EN
8
OUT
2 FLG
7
IN
3
GND
6
OUT
4 NC
4.7µF
NC 5
Cable
USB Peripheral
Figure 3. Inrush Current-Limit Application
USB
Controller
USB
Function
CBULK
2525_07.eps
Transient Overcurrent Filter
If a heavy capacitive load is suddenly connected to the output, the
switch current-limiting function may cause the fault-flag to go
low for 10µs to 200µs as the switch, in a constant current mode,
charges the capacitance. If this transient over-current fault report-
ing is not wanted, a simple 1ms RC low-pass filter in series with
the fault flag circuit will prevent this momentary flag (Figure 4).
USB Controller
OVERCURRENT
V+
10k
10k
0.1µF
IMP2525
2
FLG
Figure 4. Transient Filter
2525_05.eps
Upstream
VBUS
100mA max
VBUS
D+
D–
GND
10k
IN
OUT
LDO
GND
1µF
VIN
ON/OFF
OVERCURRENT
3.3V
USB Controller
GND
1µF
100k
VCC
5.0V
Ferrite
Beads
1
EN
8
OUT
2
FLG
7
IN
IMP2525-2 6
OUT
GND
3
0.1µF
150µF +
VBUS
D+
D–
GND
USB
Port
Data
Data
2525_08.eps
Figure 5. Single-Port Self-Powered Hub Application
6
408-432-9100/www.impweb.com
© 2000 IMP, Inc. 6
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