ON Semiconductor NCP112 Technical data

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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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14
1
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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VS33
VS5
VS12
NCP112
V
CC
14
V
REF
1
2
OV
Detector
3
OV
Fault
Delay
V
CC
SET
SQ RQ
CLR
13
FAULT
VREF
ADJ
GND
UV
Detector
Remote
On/Off
Delay
10
CTREMOTE
3.4 V
8
2.5 V
Reference
9
+
9
REMOTE
UV Blanking
Delay at
Power Up
1.28 V
+
4
1.28 V
+
1.28 V 5
5
PGI
V
V
CC
CC
7
12
Power
PGO
Good Delay
6
CTUV
Figure 1. Block Diagram
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3
11
CTPG
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