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ISP1122ABD 数据表(PDF) 25 Page - NXP Semiconductors

部件名 ISP1122ABD
功能描述  Universal Serial Bus stand-alone hub
PDF  48 Pages
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 PHILIPS - NXP Semiconductors

ISP1122ABD 数据表(HTML) 25 Page - NXP Semiconductors

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Philips Semiconductors
ISP1122A
USB stand-alone hub
Preliminary specification
Rev. 01 — 27 March 2000
25 of 48
9397 750 06986
© Philips Electronics N.V. 2000. All rights reserved.
The ISP1122A overcurrent detection circuit has been designed with a nominal trip
voltage (
∆V
trip) of 85 mV. This gives a typical trip current of approximately 850 mA for
a power switch with an on-resistance of 100 m
Ω1.
12.3 Tuning the overcurrent trip voltage
The ISP1122A trip voltage can optionally be adjusted through external components
to set the desired trip current. This is done by inserting tuning resistors at pins SP/BP
or OCn (see Figure 9). Rtu tunes up the trip voltage ∆Vtrip and Rtd tunes it down
according to Equation 1.
(1)
with Iref(nom) =5 µA and IOC(nom) = 0.5 µA.
12.4 Reference circuits
Some typical examples of port power switching and overcurrent detection modes are
given in Figure 10 to Figure 13.
The RC circuit (47 k
Ω and 0.1 µF) around the PMOS switch provides for soft turn-on.
The series resistor connecting the SP/BP pin to VCC tunes up the overcurrent trip
voltage slightly (see Figure 9). In the schematic diagram the resistor separates the
net names for pins VCC and SP/BP. This allows an automatic router to use a wide
trace for VCC and a narrow trace to connect pin SP/BP.
1.
The following PMOS power switches have been tested to work well with the ISP1122A: Philips PHP109, Vishay Siliconix Si2301DS,
Fairchild FDN338P.
∆V
trip
∆V
trip intrinsic
()
I
ref
R
tu
⋅
I
OC
R
td
⋅
–
+
=
Iref(nom) =5 µA
IOC(nom) = 0.5 µA
IOC(nom) = 0.5 µA
a.
Self-powered mode.
b.
Bus-powered mode.
Fig 9.
Tuning the overcurrent trip voltage.
handbook, halfpage
MBL167
VCC
Iref
Rtu
Rtd
low-ohmic
PMOS switch
VCC SP/BP
ISP1122A
OCn
IOC
handbook, halfpage
MBL168
VBUS
Rtd
low-ohmic
PMOS switch
VCC SP/BP
ISP1122A
OCn
IOC



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