ISP1130DL Philips Semiconductors, ISP1130DL Datasheet - Page 54

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ISP1130DL

Manufacturer Part Number
ISP1130DL
Description
Universal Serial Bus compound hub with integrated keyboard controller
Manufacturer
Philips Semiconductors
Datasheet
Philips Semiconductors
9397 750 06895
Objective specification
a.
Fig 10. Tuning the overcurrent trip voltage.
Fig 11. Hybrid-powered hub; individual port power switching; individual overcurrent detection.
handbook, halfpage
handbook, full pagewidth
I
Hybrid-powered mode.
Power switches 1 and 2 are low-ohmic PMOS devices as specified in
OC(nom)
V CC
4.85 V(min)
= 0.5 A
V CC
13.4 Reference circuit
V CC
GND
POWER SUPPLY
ISP1130
ISP1130
A typical example of individual port power switching and individual overcurrent
detection is given in
switch provides for soft turn-on. Series resistors between pins OCn/DPGLn and the
supply voltage may be used to tune down the overcurrent trip voltage (see
5 V
3%
OC1/DPGL1
OC2/DPGL2
low-ohmic
PMOS switch
OCn/DPGLn
PSW1
PSW2
330 k
R td
MBL161
(2 )
4.85 V(min)
I OC
Rev. 01 — 23 March 2000
Figure
10 k
10 k
11. The RC circuit (10 k and 1 F) around the PMOS
0.1 F
0.1 F
b.
handbook, halfpage
PMOS switch
PMOS switch
low-ohmic
low-ohmic
Section
I
Bus-powered mode.
OC(nom)
USB compound hub with keyboard controller
V BUS
13.2.
= 0.5 A
1
2
V CC
MBL162
ferrite bead
ferrite bead
120
120
F
F
ISP1130
4.75 V
4.75 V
(min)
(min)
© Philips Electronics N.V. 2000. All rights reserved.
low-ohmic
PMOS switch
OCn/DPGLn
downstream
V BUS
D
D
GND
SHIELD
V BUS
D
D
GND
SHIELD
ports
R td
MBL160
ISP1130
I OC
1
2
Figure
54 of 68
10).

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