NCP112
Supervisory IC for DesktopPower Supply Monitoring
The NCP112 is a highly integrated supervisory circuit thatincorporates all the functions necessary for monitoring andcontrolling a multi−output switch−mode power supply system. TheNCP112 provides an ability to monitor the status of the power supplyoutputs and communicate it to the system controller. Theprogrammable output delays protect against spurious faultindicators.
Features
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MARKINGDIAGRAMS141SOIC−14D SUFFIXCASE 751A1NCP112DGAWLYWW•Under and Overvoltage Protection for 3.3 V, 5.0 V and 12 V••••••••••
Outputs
Additional Adjustable Overvoltage Protection InputBuilt−in Hysteresis on all Input Pins
Programmable Undervoltage Blanking During Power−UpFault Output with 20 mA Sink CapabilityProgrammable Remote On/Off Delay TimeProgrammable Power Good Delay Time
Precision Voltage Reference with 20 mA Source CapabilityOptimized for Low−Cost 100 nF CapacitorsEnhanced Replacement to the TSM112Pb−Free Packages are Available
1PDIP−14P SUFFIXCASE 64614NCP112PAWLYYWWG1Typical Applications
•Personal Computer Switch Mode Power Supply Monitoring•Multi−Output Power Supplies Requiring System Supervision
AWLY, YYWWG= Assembly Location= Wafer Lot= Year= Work Week= Pb−Free PackagePIN CONNECTIONSVS33VS5VS12ADJPGICTUVGNDVCCFAULTPGOCTPGCTREMOTEREMOTEVREFPDIP−14, SOIC−14ORDERING INFORMATION
See detailed ordering and shipping information in the packagedimensions section on page 8 of this data sheet.
© Semiconductor Components Industries, LLC, 2006
October, 2006 − Rev. 3
1
Publication Order Number:
NCP112/D
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NCP112
PIN FUNCTION DESCRIPTION
Pin No.1234567891011121314
SymbolVS33VS5VS12ADJPGICTUVGNDVREFREMOTECTREMOTECTPGPGOFAULTVCC
Function3.3 V SENSE INPUT5.0 V SENSE INPUT12 V SENSE INPUTADJUSTABLE OVP INPUTPOWER GOOD INPUTADJUSTABLE TIMING CAPACITOR
GROUND
VOLTAGE REFERENCEREMOTE ON/OFF INPUTADJUSTABLE REMOTE ON/OFF
CAPACITORADJUSTABLE POWER GOOD
CAPACITORPOWER GOOD OUTPUT
FAULT OUTPUTPOWER SUPPLY VOLTAGE
Description
Over/undervoltage sense input for 3.3 V.Over/undervoltage sense input for 5.0 V.Over/undervoltage sense input for 12 V.
May be used for an additional overvoltage protection signal.Power good input signal.
Adjustable undervoltage blanking delay during power−up.Ground
Precision 2.5 V reference output.
Input remote control from the microcontroller. Acts as a resetsignal after a fault condition.Adjustable remote delay.Adjustable power good delay.
Power good output. Active high when no fault conditions arepresent.
Detects over/undervoltage conditions. Active high during a faultcondition.
Power supply voltage.
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NCP112
VCC14VREFVS33VS5VS12
123OVDetectorOVFaultDelayVCC13SETFAULT
SQRCLRQRemoteOn/OffDelay3.4 VUVDetector10CTREMOTE
VREF82.5 VReferenceUV BlankingDelay atPower Up−++−1.28 V9REMOTE
1.28 V4+−1.28 V5PGI
ADJ
VCCGND
712PowerGoodDelayPGO
6CTUV11CTPGFigure 1. Block Diagram
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NCP112
MAXIMUM RATINGS
Rating
Power Supply Voltage (Note 1)Power Good Output CurrentFault Output Current
Voltage Reference Output CurrentVoltage Rating (Pins 4, 5, 6, 9, 10, 11)Voltage Rating (Pins 12, 13)
Power Dissipation and Thermal Characteristics (PDIP−14)
Thermal Resistance, Junction−to−AirThermal Resistance, Junction−to−CaseMaximum Power Dissipation @ 25°CPower Dissipation and Thermal Characteristics (SOIC−14)
Thermal Resistance, Junction−to−AirThermal Resistance, Junction−to−CaseMaximum Power Dissipation @ 25°COperating Junction TemperatureOperating Ambient TemperatureStorage Temperature Range
SymbolVCCIPGOIFAULTIREF
ADJ, PGI, CTUV, REMOTE,
CTREMOTE, CTPG
PGO, FAULT
RqJARqJCPDRqJARqJCPDTJTATstg
Value18303020VCC18100451.25125301.0+150−40 to +125−55 to +150
UnitVmAmAmAVV°C/W°C/WW°C/W°C/WW°C°C°C
ELECTRICAL CHARACTERISTICS (VCC = 5.0 V, TA = 25°C for typical values and TA = 0°C to 85°C for min and max values, unless
otherwise noted.)
Characteristic
OPERATING CONDITIONSDC Power SupplyPower Supply Current
OVERVOLTAGE/UNDERVOLTAGE PROTECTIONOvervoltage Protection3.3 V Output SenseHysteresis*5.0 V Output SenseHysteresis*12 V Output SenseHysteresis*
Undervoltage Protection3.3 V Output SenseHysteresis*5.0 V Output SenseHysteresis*12 V Output SenseHysteresis*
VUV33VUVhys33VUV5VUVhys5VUV12VUVhys12
2.3−3.7−9.2−
2.51004.010010100
2.7−4.3−10.8−
VmVVmVVmV
VOV33VOVhys33VOV5VOVhys5VOV12VOVhys12
3.8−5.8−13.4−
4.0406.16014.2130
4.2−6.4−15−
VmVVmVVmV
VCCICC
4.5−
−3.0
165.0
VmA
Symbol
Min
Typ
Max
Unit
*Hysteresis is measured in direction from threshold point back to nominal value of input voltage (i.e. 3.3 V, 5.0 V or 12 V).1.This device contains ESD protection and exceeds the following tests:
Human Body Model JESD 22−A114−B: 2.0 kVMachine Model JESD 22−A115−A: 200 V
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NCP112
ELECTRICAL CHARACTERISTICS (continued) (VCC = 5.0 V, TA = 25°C for typical values and TA = 0°C to 85°C for min and max
values, unless otherwise noted.)
Characteristic
OVERVOLTAGE/UNDERVOLTAGE PROTECTION (continued)Undervoltage Protection (continued)
Adjustable Overvoltage Protection ThresholdHysteresis
UNDERVOLTAGE BLANKING DURING POWER UPUndervoltage Blanking Time (CTUV = 100 nF)Undervoltage Blanking Threshold Voltage (Pin 6)POWER GOOD
Power Good Input Threshold VoltagePower Good Input Hysteresis
Low State Open Collector Saturation Voltage(I = 20 mA)
High State Open Collector Leakage Current(V = 5.0 V)
Power Good Transient (See Application Note Section)Rise TimeFall Time
Adjustable Delay Time (CTPG = 100 nF)Power Good Threshold Voltage (Pin 11)FAULT
Fault Sink Current
Fault Saturation Voltage (I = 20 mA)Fault Leakage Current (V = 5.0 V)Fault Delay Time Before LatchingREMOTE CONTROL
Remote Input Voltage ThresholdRemote Hysteresis
Remote Pin Internal Pull−Up VoltageRemote Low State Saturation CurrentRemote Time Delay (CTREMOTE = 100 nF)Remote OnRemote Off
Remote Delay Threshold Voltage (Pin 10)Low LevelHigh Level
VOLTAGE REFERENCE
Internal Voltage Reference (IO = 1.0 mA) @ 25°CInternal Voltage Reference (IO = 1.0 mA) 0°C to 85°CLine Regulation (4.5 V < VCC < 16 V)Iout = 0 mAIout = 10 mA
Load Regulation (VCC = 5.0 V)0 mA < Iout < 10 mA
VREFVREFVREFlineVREFlineVREFload
2.462.42−−−
2.502.504.01525
2.542.5810−−
mVVmV
VRthVRhysVRhIRlTREMonTREMoffTREMth loTREMth hi
−−3.3−3535−−
1.28253.4−45450.22.3
−−3.60.56060
V
−−
VmVVmAms
IFAULTVFAULTsatIFAULTleakTFAULT
20−−−
−−−100
−0.41.0−
mAVmAms
VPGIthVPGIhysVLsatIHleak
−−−−
1.2825−−
−−0.41.0
VmVVmAms
TPGraiseTPGfallTPGTPGth
−−100−
1.01.03002.5
−−500−
msV
TUVTUVth
100−
3002.5
500−
msV
VADJthVADJth
−−
1.28100
−−
VmV
Symbol
Min
Typ
Max
Unit
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NCP112
VCCREMOTE
FAULT
PGI
PGO
OVPUVP3.3 V, 5 V, 12 V
TpgTremote (ON)
Tremote (OFF)
Tfault (OV)
Figure 2. Timing Diagram
Table 1. FUNCTION TABLE
PGI<1.28 V (L)<1.28 V (L)<1.28 V (L)<1.28 V (L)<1.28 V (L)<1.28 V (L)>1.28 V (H)>1.28 V (H)>1.28 V (H)>1.28 V (H)>1.28 V (H)>1.28 V (H)
X
REMOTE
LLLLLLLLLLLLH
ADJ<1.28 V (L)<1.28 V (L)<1.28 V (L)>1.28 V (H)>1.28 V (H)>1.28 V (H)<1.28 V (L)<1.28 V (L)<1.28 V (L)>1.28 V (H)>1.28 V (H)>1.28 V (H)
X
Undervoltage
NoNoYesNoNoYesNoNoYesNoNoYesX
Overvoltage
NoYesNoNoYesNoNoYesNoNoYesNoX
FAULTHHHLHHHHHLHHH
PGOLLLLLLLLLHLLL
2.X = > Don’t care.
3.FAULT = L means main PWM is Enable.
4.PGO = H means power supply is working within ATX specifications.
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NCP112
XPRIMARYRECTIFIERMAINCONVERTER12 V12 V5 V3.3 V5 V3.3 VPWM + OPTO+ VrefAUXILIARYCONVERTERVCC5 V STBY5 V STBYPWM + OPTO+ VrefNCP112FAULT− Over and Undervoltage Protection− Reference− Logic− SequencerPGREMFigure 3. Simplified Application Schematic
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NCP112
PIN FUNCTION DESCRIPTION
Main Line Sensing − VS33, VS5 and VS12
These pins are used to monitor the main power outputs.The internal circuitry of the NCP112 provides over andundervoltage detection and indicates an error state. Theover and undervoltage levels meet the ATX specification.In order to avoid unexpected oscillation of the device, theNCP112 features both over and undervoltage hysteresis.The overvoltage detection circuitry incorporates a faultdelay, which helps to filter short positive voltage spikesbelow 100 ms. To avoid triggering a false undervoltagesignal during power−up, a timing capacitor (CTUV) maybe used to introduce a user defined blanking delay.
Additional Overvoltage Protection – ADJ
internal current sources for charging and/or dischargingcapacitors.
Remote Control – REMOTE
This pin can be used as another user−defined monitoringinput and has a hysteresis feature similar to VS33, VS5 andVS12. When the input voltage is below the threshold levelof 1.28 V, a fault condition is asserted. Note that the ADJpin is logically ORed with the overvoltage detector output,thus there is a 100 ms fault delay.
Power Good Input – PGI
A reset signal can be realized with the REMOTE pin.When the Remote pin is in the active low state, the externallink (the Fault signal) between the NCP112 and the PulseWidth Modulator (PWM) generator of the external powersupply is enabled (Figure 3). In order to effectively resetthe latch, a minimum width remote pulse should beapplied. The width of this pulse should be greater thanTREM, which is determined by adding an external capacitor(CTREMOTE). Note that the REMOTE pin is internallypulled up to 3.4 V.
Power Good Output – PGO
The Power Good Input (PGI) can be used to monitor anadditional logic event, for example, the temperature insidean ATX power supply unit. When the input voltage at thePGI input is below the threshold level of 1.28 V, the PowerGood Output (PGO) signal remains in a low state, even ifall three sense inputs are within voltage limits. The PGIsignal, along with the REMOTE, and the over andundervoltage singles encounter a power good delay circuitas depicted in Figure 1.
Timing Capacitors – CTUV, CTREMOTE, CTPG
The purpose of the PGO function is to warn themotherboard that the voltage of at least one of the threemain power lines is out of range, independent of the ADJinput. Please refer to Table 1 for a functional Truth table.The PGO is subject to a delay TPG, which can be adjustedwith an external capacitor (CTPG). The Power GoodOutput pin is capable of sinking 20 mA of current.
Fault Output – FAULT
The NCP112 timing circuitry is optimized for utilizinglow cost, 100 nF ceramic capacitors. The time delays ofCTUV, CTREMOTE, and CTPG can be adjusted by simplychanging external capacitor values. The time delay is alinear function of the capacitance because the NCP112 uses
ORDERING INFORMATION
Device
NCP112PNCP112PGNCP112DNCP112DGNCP112DR2NCP112DR2G
In a typical application such as Figure 3, the fault pin(FAULT), is activated when any one of the three mainpower lines (3.3 V, 5.0 V, 12 V) is out of range or the ADJpin is below 1.28 V. This is independent of the PGI input.The Fault output is the external link between the NCP112and the primary PWM. In the event of a short circuitcondition, the overvoltage circuitry provides an additionaldelay time TFAULT which provides adequate protection.
Voltage Reference – VREF
The VREF is a 2.5V precision reference output, withcurrent sourcing capability of 20 mA. No bypass capacitoror minimum output current is required to maintain stability.
PackagePDIP−14PDIP−14(Pb−Free)SOIC−14SOIC−14(Pb−Free)SOIC−14SOIC−14(Pb−Free)
Shipping†25 Units / Rail
55 Units / Rail
2500 / Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel PackagingSpecifications Brochure, BRD8011/D.
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NCP112
PACKAGE DIMENSIONS
PDIP−14CASE 646−06ISSUE P
148B17NOTES:1.DIMENSIONING AND TOLERANCING PER ANSIY14.5M, 1982.2.CONTROLLING DIMENSION: INCH.3.DIMENSION L TO CENTER OF LEADS WHENFORMED PARALLEL.4.DIMENSION B DOES NOT INCLUDE MOLD FLASH.5.ROUNDED CORNERS OPTIONAL.INCHESMINMAX0.7150.7700.2400.2600.1450.1850.0150.0210.0400.0700.100 BSC0.0520.0950.0080.0150.1150.1350.2900.310−−−10 _0.0150.039MILLIMETERSMINMAX18.1619.566.106.603.694.690.380.531.021.782.54 BSC1.322.410.200.382.923.437.377.87−−−10 _0.381.01AFN−T−SEATINGPLANELCHGD14 PLKMJMDIMABCDFGHJKLMN0.13 (0.005)http://onsemi.com
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NCP112
PACKAGE DIMENSIONS
SOIC−14CASE 751A−03
ISSUE H
−A−148NOTES:
1.DIMENSIONING AND TOLERANCING PERANSI Y14.5M, 1982.
2.CONTROLLING DIMENSION: MILLIMETER.3.DIMENSIONS A AND B DO NOT INCLUDEMOLD PROTRUSION.
4.MAXIMUM MOLD PROTRUSION 0.15 (0.006)PER SIDE.
5.DIMENSION D DOES NOT INCLUDEDAMBAR PROTRUSION. ALLOWABLEDAMBAR PROTRUSION SHALL BE 0.127(0.005) TOTAL IN EXCESS OF THE DDIMENSION AT MAXIMUM MATERIALCONDITION.
−B−P7 PL0.25 (0.010)MBM17GC−T−SEATINGPLANERX 45_FD14 PL0.25 (0.010)KMMSJTBASSOLDERING FOOTPRINT*7XDIMABCDFGJKMPRMILLIMETERSMINMAX8.558.753.804.001.351.750.350.490.401.251.27 BSC0.190.250.100.250 7 __5.806.200.250.50INCHES
MINMAX0.3370.3440.1500.1570.0540.0680.0140.0190.0160.0490.050 BSC0.0080.0090.0040.0090 7 __0.2280.2440.0100.0197.0410.5814X14X1.521.27PITCHDIMENSIONS: MILLIMETERS
*For additional information on our Pb−Free strategy and solderingdetails, please download the ON Semiconductor Soldering andMounting Techniques Reference Manual, SOLDERRM/D.
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