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NCP112
Supervisory IC for Desktop
Power Supply Monitoring
The NCP112 is a highly integrated supervisory circuit that
incorporates all the functions necessary for monitoring and
controlling a multi−output switch−mode power supply system. The
NCP112 provides an ability to monitor the status of the power supply
outputs and communicate it to the system controller. The
programmable output delays protect against spurious fault
indicators.
Features
• Under and Overvoltage Protection for 3.3 V, 5.0 V and 12 V
Outputs
• Additional Adjustable Overvoltage Protection Input
• Built−in Hysteresis on all Input Pins
• Programmable Undervoltage Blanking During Power−Up
• Fault Output with 20 mA Sink Capability
• Programmable Remote On/Off Delay Time
• Programmable Power Good Delay Time
• Precision Voltage Reference with 20 mA Source Capability
• Optimized for Low−Cost 100 nF Capacitors
• Enhanced Replacement to the TSM112
T ypical Applications
• Personal Computer Switch Mode Power Supply Monitoring
• Multi−Output Power Supplies Requiring System
Supervision
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PIN CONNECTIONS AND
MARKING DIAGRAM
VS33
VS5
VS12
ADJ
PGI
CTUV
GND
AWLYYWW
NCP1 12
SOIC−14
D SUFFIX
CASE 751A
PDIP−14
P SUFFIX
CASE 646
VCC
FAULT
PGO
CTPG
CTREMOTE
REMOTE
VREF
Semiconductor Components Industries, LLC, 2004
February, 2004 − Rev. 1
PDIP−14, SOIC−14
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
ORDERING INFORMATION
Device Package Shipping†
NCP1 12P PDIP−14 25 Tube
NCP1 12D SOIC−14 55 Tube
NCP1 12DR2 SOIC−14 2500 Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
1 Publication Order Number:
NCP112/D
NCP112
PIN FUNCTION DESCRIPTION
Pin No. Symbol Function Description
1 VS33 3.3 V SENSE INPUT Over/undervoltage sense input for 3.3 V .
2 VS5 5.0 V SENSE INPUT Over/undervoltage sense input for 5.0 V .
3 VS12 12 V SENSE INPUT Over/undervoltage sense input for 12 V .
4 ADJ ADJUSTABLE OVP INPUT May be used for an additional overvoltage protection signal.
5 PGI POWER GOOD INPUT Power good input signal.
6 CTUV ADJUSTABLE TIMING
CAPACITOR
7 GND GROUND Ground
8 VREF VOLTAGE REFERENCE Precision 2.5 V reference output.
9 REMOTE REMOTE ON/OFF INPUT Input remote control from the microcontroller. Acts as a reset
10 CTREMOTE ADJUSTABLE REMOTE ON/OFF
CAPACITOR
11 CTPG ADJUSTABLE POWER GOOD
CAPACITOR
12 PGO POWER GOOD OUTPUT Power good output. Active high when no fault conditions are
13 FAULT FAULT OUTPUT Detects over/undervoltage conditions. Active high during a
14 VCC POWER SUPPLY VOLTAGE Power supply voltage.
Adjustable undervoltage blanking delay during power−up.
signal after a fault condition.
Adjustable remote delay.
Adjustable power good delay.
present.
fault condition.
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