WT7515 (Weltrend)
PC POWER SUPPLY SUPERVISOR

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Weltrend Semiconductor, Inc.
`
WT7515
PC POWER SUPPLY SUPERVISOR
Data Sheet
REV. 1.50
May 07, 2004
The information in this document is subject to change without notice.
©Weltrend Semiconductor, Inc. All Rights Reserved.
24 2
2F, No. 24, Industry E. 9th RD., Science-Based Industrial Park, Hsin-Chu, Taiwan
TEL:886-3-5780241 FAX:886-3-5794278.5770419
Email:support@weltrend.com.tw


WT7515 (Weltrend)
PC POWER SUPPLY SUPERVISOR

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WT7515
Rev. 1.50
GENERAL DESCRIPTION
The WT7515 provides protection circuits, power good output (PGO), fault protection latch (FPOB),
and a protection detector function (PSONB) control. It can minimize external components of switching
power supply systems in personal computer.
The Over / Under Voltage Detector (OVD / UVD) monitors 3.3V, 5V, 12V input voltage level. The
Over Current Detector (OCD) monitor IS33, IS5, IS12 input current sense. When OVD or UVD or OCD
detect the fault voltage level, the FPOB is latched HIGH and PGO go low. The latch can be reset by
PSONB go HIGH. There is 2.4 ms delay time for PSONB turn off FPOB.
When OVD and UVD and OCD detect the right voltage level, the power good output (PGO) will be
issue.
FEATURES
The Over / Under Voltage Detector (OVD / UVD) monitors 3.3V, 5V, 12V input voltage level.
The Over Current Detector (OCD) monitors IS33, IS5, IS12 input current sense.
Both of the power good output (PGO) and fault protection latch (FPOB) are Open Drain Output.
75 / 300 ms time delay for UVD.
300 ms time delay for PGO.
38 ms for PSONB input signal De–bounce.
73 us for internal signal De–glitches.
2.4 ms time delay for PSONB turn-off FPOB.
PIN ASSIGNMENT AND PACKAGE TYPE
Pin assignment
WT7515–140WT
PGI
GND
FPOB
PSONB
IS12
RI
NC
1 14
2 13
3 12
4 11
5 10
69
78
PGO
VCC
V5
V33
V12
IS33
IS5
WT7515–141WT
PGI
GND
FPOB
PSONB
IS12
RI
IS5
1 14
2 13
3 12
4 11
5 10
69
78
PGO
VCC
V5
V33
VCC2
V12
IS33
ORDERING INFORMATION
PACKAGE
14–Pin Plastic DIP
14–Pin Plastic SOP
WT7515–N140WT
WT7515–S140WT
WT7515–N141WT
WT7515–S141WT
Lead–Free Pb
WT7515–N140WT Pb WT7515–S140WT Pb
WT7515–N141WT Pb WT7515–S141WT Pb
The Top-Side Marking would been added a dot
in the right side for lead-free package.
Weltrend Semiconductor, Inc.
Page 2


WT7515 (Weltrend)
PC POWER SUPPLY SUPERVISOR

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WT7515
Rev. 1.50
PIN DESCRIPTION
Pin Name TYPE
PGI I
GND
P
FPOB
O
PSONB
I
IS12
I
RI I
VCC2
I
IS5 I
IS33
I
V12 I
V33 I
V5 I
VCC
I
PGO
O
Description
Power good input signal pin
Ground
Fault protection output pin, open drain output
On/Off switch input
12V over current protection sense input
Current sense adjust input
Current sense power supply
5V over current protection sense input
3.3V over current protection sense input
12V over/under voltage input pin
3.3V over/under voltage input pin
5V over/under voltage input pin
Power supply
Power good output signal pin, open drain output
BLOCK DIAGRAM
VCC
VCCI
PSONB
V33
V5
V12
PGI
IS33
IS5
IS12
PWR
38ms
debounce
-
+
UN
-
+
OV
-
+
UN
-
+
OV
-
+
UN
VREF
-
+
OV
-
+
UN
VCC2
-
+
OI
IREF * 8
VCC2
-
+
OI
IREF * 8
VCC2
-
+
OI
IREF * 8
Power On Reset
RST
2.4ms
clr
delay
75ms
clr
delay
PWR
RST
73us
debounce
Bandgap
Reference
VREF = 1.2V
Internal
Power
PWR
VCCI = 3.6V
OSC
CLK
R
SQ
FPOB
RST
73us
debounce
300ms
clr
delay
PGO
V12
VREF
V12
+
-
IREF
RI
Weltrend Semiconductor, Inc.
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WT7515 (Weltrend)
PC POWER SUPPLY SUPERVISOR

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WT7515
Rev. 1.50
ABSOLUTE MAXIMUM RAT INGS
Parameter
Min.
Max.
Supply voltage, VCC, VCC2, V12
Input voltage
PSONB, V5, V33, PGI,
I12, I5, I33
Output voltage
FPOB, PGO
Operating temperature
–0.3
–0.3
–0.3
–0.3
-40
16
7
V12+0.3
7
125
Storage temperature
-55 150
*Note: Stresses above those listed may cause permanent damage to the devices
Unit
V
V
V
V
RECOMMENDED OPERATING CONDITIONS
Parameter
Supply voltage, VCC
Supply voltage, VCC2
Input voltage
PSONB, V5, V33, PGI
V12
Output voltage
FPOB, PGO
Output sink current
FPOB
PGO
Supply voltage rising time
Output current for RI
RI
Conditions
Min.
4
9.5
1
10
Typ.
12
12
Max.
15
15
7
15
7
30
10
65
Unit
V
V
V
V
mA
mA
ms
uA
ELECTRICAL CHARACTERISTICS, at Ta=25°C and VCC=5V.
Over Voltage Detection
Parameter
Over voltage threshold
V33
V5
V12
ILEAKAGE Leakage current (FPOB)
VOL Low level output voltage (FPOB)
Condition
V(FPOB) = 5V
Isink =10mA
Isink =30mA
Min.
3.7
5.7
13.3
Typ.
3.9
6.1
13.8
5
0.3
0.7
PGI and PGO
Parameter
Under voltage threshold
V33
V5
V12
Input threshold voltage(PGI)
ILEAKAGE Leakage current(PGO)
VOL Low level output voltage(PGO)
Input offset voltage of OCP comparators
Condition
PGO = 5V
Isink =10mA
Min.
2.55
4.1
9.5
1.16
-5
Typ.
2.69
4.3
10
1.20
5
0.4
Max.
4.1
6.5
14.3
Unit
V
V
V
uA
V
Max.
2.83
4.47
10.5
1.24
5
Unit
V
V
V
V
uA
V
mV
PSONB
Parameter
Input pull-up current
High-level input voltage
Low-level input voltage
Condition
PSONB= 0V
Min.
2.0
Typ.
150
Max.
0.8
Unit
uA
V
V
Weltrend Semiconductor, Inc.
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WT7515 (Weltrend)
PC POWER SUPPLY SUPERVISOR

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WT7515
Rev. 1.50
TOTAL DEVICE
Parameter
Icc Supply current
Vcc low voltage
Condition
PDON _N= 5V
Min.
Typ.
3.6
Max.
1
Unit
mA
V
SWITCHING CHARACTERISTICS, Vcc=5V
Parameter
tdb1 De-bounce time (PSONB)
tdleay1 Delay time (PGI to PGO)
tdb2 De-bounce time (PSONB)
tg De-glitch time
tdelay2 PSONB to FPOB delay time
tdelay3 Internal UVD/OCD delay time
Condition
Min. Typ. Max.
32 38 61
200 300 490
32 38 61
63 73 120
tdb2+2.0 tdb2+2.4 tdb2+3.8
after FPOB go low & 65
75 122
PGI > 1.2V
after FPOB go low & 260 300 488
PGI < 1.2V
Unit
mS
mS
mS
uS
mS
mS
mS
Weltrend Semiconductor, Inc.
Page 5


WT7515 (Weltrend)
PC POWER SUPPLY SUPERVISOR

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WT7515
Rev. 1.50
APPLICATION CIRCUIT
PSONB
+5VSB
10K
300
0.01uF
+5VSB
1K
PGI
30K, 1%
WT7515-141
+5V
1K
1uF
PGI PGO
GND
FPOB
VCC
V5
R0=47
PSONB
V33
IS12
RI
IS5
VCC2
V12
IS33
R0=47
22uF
R2, 1%
22uF
R1, 1%
NOTE1 The R0 can not be omitted at V5 and V33.
APPLICATION NOTE
22uF
R3, 1%
+5VSB
+3.3V
+3.3V input
+5V
+5V input
+12V
+12V input
When the current cross inductor raised, inductor voltage raised.
And when inductor voltage exceeded resistor voltage, the OCP active.
We can setup OCP point by the following equation
Let VR = VL
R * IR = RL * IL
IR = 8 * IREF
R * (8 * VREF / RI) = RL * IL
R = (RL * IL) / (8 * VREF / RI) ––––– (1)
Weltrend Semiconductor, Inc.
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WT7515 (Weltrend)
PC POWER SUPPLY SUPERVISOR

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APPLICATION TIMMING
1.) PGI (UNDER_VOLTAGE)
PSONB
FPOB
PGO
PGI
tdb1 tdelay1+tg
PSONB
FPOB
PGO
PGI
tdb1 tdelay1+tg
WT7515
Rev. 1.50
tdelay2
tdb2
tdelay1+tg
tdelay2
tdb2
Weltrend Semiconductor, Inc.
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WT7515 (Weltrend)
PC POWER SUPPLY SUPERVISOR

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WT7515
Rev. 1.50
2.) V33, V5, V12 (UNDER_VOLTAGE) or IS33 IS5 IS12 (OVER_CURRENT)
PSONB
FPOB
PGO
V33/V5/V12
IS33/IS5/IS12
PSONB
FPOB
PGO
PGI
V33/V5/V12
IS33/IS5/IS12
PSONB
FPOB
PGO
PGI
V33/V5/V12
IS33/IS5/IS12
tdb1 tdelay1+tg
tdelay2
tdb2
tdelay3=75mS
tdelay3+t
g
tdb1
tdb1 tdelay1+tg
tdelay2
tdb2
tdelay3=300mS
tdelay3+tg
tdb1
tdb1 tdelay1+tg
tdelay2
tdb2
Weltrend Semiconductor, Inc.
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WT7515 (Weltrend)
PC POWER SUPPLY SUPERVISOR

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3.) V33, V5, V12 (OVER_VOLTAGE)
PSONB
FPOB
PGO
V33/V5/V12
tdb1 tdelay1+tg
WT7515
Rev. 1.50
tdelay2
tdb2
PSONB
FPOB
PGO
V33/V5/V12
tg
tdb1
tdb1 tdelay1+tg
tdelay2
tdb2
Weltrend Semiconductor, Inc.
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WT7515 (Weltrend)
PC POWER SUPPLY SUPERVISOR

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WT7515
Rev. 1.50
MECHANICAL INFORMATION
PLASTIC DUAL–IN–LINE PACKAGE
NOTE 1 All linear dimensions are in inches millimeters .
NOTE 2 This drawing is subject to change without notice.
NOTE 3 Falls within JEDEC MS–001
Weltrend Semiconductor, Inc.
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WT7515 (Weltrend)
PC POWER SUPPLY SUPERVISOR

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WT7515
Rev. 1.50
PLASTIC SMALL–OUTLINE PACKAGE
NOTE 1 All linear dimensions are in inches millimeters .
NOTE 2 This drawing is subject to change without notice.
NOTE 3 Falls within JEDEC MS–012
Weltrend Semiconductor, Inc.
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