參數(shù)資料
型號(hào)： ISP1122ANB
廠商： NXP SEMICONDUCTORS
元件分類： 總線控制器
英文描述： Universal Serial Bus stand-alone hub
中文描述： UNIVERSAL SERIAL BUS CONTROLLER, PDIP32
封裝： 0.400 INCH, PLASTIC, SDIP-32
文件頁(yè)數(shù)： 25/48頁(yè)
文件大小： 1150K
代理商： ISP1122ANB
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
1
.
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
). R
tu
tunes up the trip voltage
V
trip
and R
td
tunes it down
according to
Equation 1
.
(1)
with I
ref(nom)
= 5
μ
A and I
OC(nom)
= 0.5
μ
A.
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
and 0.1
μ
F) around the PMOS switch provides for soft turn-on.
The series resistor connecting the SP/BP pin to V
CC
tunes up the overcurrent trip
voltage slightly (see
Figure 9
). In the schematic diagram the resistor separates the
net names for pins V
CC
and SP/BP. This allows an automatic router to use a wide
trace for V
CC
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
–
+
=
I
ref(nom)
= 5
μ
A
I
OC(nom)
= 0.5
μ
A
Self-powered mode.
I
OC(nom)
= 0.5
μ
A
a.
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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