WT7527
Rev. 1.20
ꢀ
GENERAL DESCRIPTION
TheꢀWT7527ꢀprovidesꢀprotectionꢀcircuits,ꢀpowerꢀgoodꢀoutputꢀ(PGO),ꢀfaultꢀprotectionꢀlatchꢀ(FPOB),ꢀ
andꢀaꢀprotectionꢀdetectorꢀfunctionꢀ(PSONB)ꢀcontrol.ꢀItꢀcanꢀminimizeꢀexternalꢀcomponentsꢀofꢀswitchingꢀ
powerꢀsupplyꢀsystemsꢀinꢀpersonalꢀcomputer.ꢀ
TheꢀOverꢀVoltageꢀDetectorꢀ(OVD)ꢀmonitorsꢀVX,ꢀV33,ꢀV5,ꢀV12AꢀandꢀV12Bꢀinputꢀvoltageꢀlevel.ꢀTheꢀ
UnderꢀVoltageꢀDetectorꢀ(UVD)ꢀmonitorsꢀV33,ꢀV5,ꢀV12AꢀandꢀV12Bꢀinputꢀvoltageꢀlevel.ꢀTheꢀOverꢀCurrentꢀ
Detectorꢀ(OCD)ꢀmonitorꢀI33&V33,ꢀI5&V5,ꢀI12A&V12AꢀandꢀI12B&V12Bꢀinputꢀcurrentꢀsense.ꢀTheꢀpinꢀVXꢀ
providesꢀanꢀextraꢀprotectionꢀfunction.ꢀWhenꢀOVDꢀorꢀUVDꢀorꢀOCDꢀorꢀVXꢀdetectꢀtheꢀfaultꢀvoltageꢀlevel,ꢀ
theꢀFPOBꢀisꢀlatchedꢀHIGHꢀandꢀPGOꢀgoꢀlow.ꢀTheꢀlatchꢀcanꢀbeꢀresetꢀbyꢀPSONBꢀgoꢀHIGH.ꢀThereꢀisꢀ4ꢀmsꢀ
delayꢀtimeꢀforꢀPSONBꢀturnꢀoffꢀFPOB.ꢀ
WhenꢀOVDꢀandꢀUVDꢀandꢀOCDꢀdetectꢀtheꢀrightꢀvoltageꢀlevel,ꢀtheꢀpowerꢀgoodꢀoutputꢀ(PGO)ꢀwillꢀbeꢀ
issue.ꢀ
ꢀ
FEATURES
•ꢀ ꢀ TheꢀOverꢀVoltageꢀDetectorꢀ(OVD)ꢀmonitorsꢀVX,ꢀV33,ꢀV5,ꢀV12AꢀandꢀV12Bꢀinputꢀvoltage.ꢀ
•ꢀ ꢀ TheꢀUnderꢀVoltageꢀDetectorꢀ(UVD)ꢀmonitorsꢀV33,ꢀV5,ꢀV12AꢀandꢀV12Bꢀinputꢀvoltage.ꢀ
•ꢀ ꢀ TheꢀOverꢀCurrentꢀDetectorꢀ(OCD)ꢀmonitorsꢀI33&33,ꢀI5&V5,ꢀI12A&V12AꢀandꢀI12B&V12Bꢀinputꢀpins.ꢀ
•ꢀ TheꢀVXꢀ>ꢀ1.2Vꢀprovideꢀanꢀextraꢀprotection.ꢀ
•ꢀ Bothꢀofꢀtheꢀpowerꢀgoodꢀoutputꢀ(PGO)ꢀandꢀfaultꢀprotectionꢀlatchꢀ(FPOB)ꢀareꢀOpenꢀDrainꢀOutput.ꢀ
•ꢀ ꢀ 75ꢀ/ꢀ600ꢀmsꢀtimeꢀdelayꢀforꢀUVDꢀ/ꢀOCDꢀ/ꢀVXꢀ.ꢀ
•ꢀ ꢀ 300ꢀmsꢀtimeꢀdelayꢀforꢀPGO.ꢀ
•ꢀ ꢀ 38ꢀmsꢀforꢀPSONBꢀinputꢀsignalꢀDe–bounce.ꢀ
•ꢀ ꢀ 14ꢀusꢀforꢀOVDꢀinternalꢀsignalꢀDe–glitch.ꢀ
•ꢀ ꢀ 60ꢀusꢀforꢀUVDꢀ/ꢀVXꢀinternalꢀsignalꢀDe–glitch.ꢀ
•ꢀ ꢀ 20ꢀmsꢀforꢀOCDꢀinternalꢀsignalꢀDe–glitch.ꢀ
•ꢀ ꢀ 73ꢀusꢀforꢀPGIꢀinternalꢀsignalꢀDe–glitch.ꢀ
•ꢀ ꢀ 4ꢀmsꢀforꢀPSONBꢀturnꢁoffꢀFPOB.ꢀ
ꢀ
PIN ASSIGNMENT AND PACKAGE TYPE
Pin assignment
WT7527
1
2
3
4
5
6
7
8ꢀ
16
15
14
13
12
11
10
9ꢀ
PGI
PGO
VCC
V5
GND
FPOB
PSONB
I12A
V33
V12A
I33
RI
I12B
I5
V12B
ꢀ
VX
ꢀ
Weltrend Semiconductor, Inc.
Pageꢀ2
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