ISP1130DL Philips Semiconductors, ISP1130DL Datasheet - Page 54

• Manufacturer Part Number: ISP1130DL
• Description: Universal Serial Bus compound hub with integrated keyboard controller
• Manufacturer: Philips Semiconductors

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).