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HIP1011A
Pin Descriptions
PIN NO.
1
2
DESIGNATOR
M12VIN
FLTN
FUNCTION
-12V Input
Fault Output
DESCRIPTION
-12V Supply Input. Also provides power to the -12V overcurrent circuitry.
5V CMOS Fault Output; LOW = FAULT. A capacitor may be placed from this pin to ground to
provide delay time to fault notification and power supply latch-off.
3
3V5VG
3.3V/5V Gate Output
Drive the gates of the 3.3V and 5V MOSFETs. Connect a capacitor to ground to set the start-
up ramp. During turn on, this capacitor is charged with a 25 μ A current source.
4
5
6
VCC
12VIN
3VISEN
12V V CC Input
12V Input
3.3V Current Sense
Connect to unswitched 12V supply.
Switched 12V supply input.
Connect to the load side of the current sense resistor in series with source of external 3.3V
MOSFET.
7
3VS
3.3V Source
Connect to source of 3.3V MOSFET. This connection along with pin 6 (3VISEN) senses the
voltage drop across the sense resistor.
8
OCSET
Overcurrent Set
Connect a resistor from this pin to ground to set the overcurrent trip point of all four switches.
All four over current trips can be programmed by changing the value of this resistor. The
default (6.04k ?, 1%) is compatible with the maximum allowable currents as outlined in the
PCI specification.
9
10
PWRON
5VS
Power On Control
5V Source
Controls all four switches. High to turn switches ON, Low to turn them OFF.
Connect to source of 5V MOSFET switch. This connection along with pin 11 (5VISEN)
senses the voltage drop across the sense resistor.
11
5VISEN
5V Current Sense
Connect to the load side of the current sense resistor in series with source of external 5V
MOSFET.
12
13
12VO
GND
Switched 12V Output
Ground
Switched 12V output.
Connect to common of power supplies.
14
15
12VG
M12VG
Gate of Internal PMOS Connect a capacitor between 12VG and 12VO to set the start up ramp for the +12V supply.
This capacitor is charged with a 25 μ A current source during start-up. The UV circuitry is
enabled after the voltage on 12VG is less than 400mV. Therefore, if the capacitor on the pin
3 (3V5VG) is more than 25% larger than the capacitor on pin 14 (12VG) a false UV may be
detected during start up.
Gate of Internal NMOS Connect a capacitor between M12VG and M12VO to set the start up ramp for the M12V
supply. This capacitor is charged with 25 μ A during start up.
16
M12VO
Switched -12V
Switched 12V Output.
Output
3
FN4631.5
November 16, 2004
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