pip401-03 NXP Semiconductors, pip401-03 Datasheet - Page 3

• Manufacturer Part Number: pip401-03
• Description: Pip401 Or-ing Intelligent Switch
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 10578
Product data
7.2.1 Comparator
7.2.2 Remote sense input
7.1 Supply voltage
7.2 Voltage drop monitoring
The open-collector overtemperature flag output (TFL) is fed back to the remote
shutdown input of the protected supply. In a parallel redundant system, there will be
at least one other protected supply feeding the system bus via another or-ing device.
The PIP401 requires a supply voltage on V
5 V greater than the voltage on VI in order to supply sufficient drive voltage for the
series power switch. The maximum rated supply voltage is 20 V.
The comparator monitors the voltage between the input (VI) and the remote sense
input (VRS). When the voltage on VI is greater than the voltage on VRS by more than
a few millivolts, the comparator output goes HIGH, turning on the series power switch.
When the voltage on VI is less than the voltage on VRS, the series power switch is
turned off, blocking the flow of reverse current between VO and VI.
The remote sense input (VRS) provides a high impedance connection to the load,
bypassing the power supply line inductance. This connection enables the PIP401 to
respond immediately to voltage changes at the load, removing the effects of voltage
transients induced in the power supply line inductance due to changes in load
current.
Fig 2. Functional circuit diagram.
(1) C1 allows operation for a short time after the auxiliary supply to V
(2) D1 prevents reverse current flow from VO into the auxiliary supply in the event of failure
(3) R1 prevents charging of the input voltage due to current flowing from V
(4) VRS should be connected to VO at the load point. Direct connection between VRS and
of the auxiliary supply.
VO at the device pins should only be made if the distance between the PIP401 and the
load is very short, less than 25 mm.
auxiliary supply
input voltage
from power supply
system
ground
power supply shutdown
(open collector)
20 V max
Rev. 03 — 5 November 2002
D1
R1
(100
typ)
C1
(100 nF)
CC
. The supply voltage must be at least
VI
V CC
TFL
GND
© Koninklijke Philips Electronics N.V. 2002. All rights reserved.
VRS
VO
system bus ground
OR-ing Intelligent Switch
system bus
CC
fails.
CC
03aj16
and out of VI.
PIP401
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