UNISONIC TECHNOLOGIES CO., LTD
3515A
PC POWER SUPPLY
SUPERVISOR
DESCRIPTION
The UTC
3515A
is specially designed for switching power supply
system. it provides protection circuits, power good output (PGO)
indicator, fault protection output (FPOB) and a PSONB control.
The protection circuits include over voltage protection (OVP),
under voltage protection (UVP) and over current protection (OCP)
monitoring for system voltages and currents.
When 3.3V, 5V or 12V voltage is decreasing to 2.68V, 4.3V and
9.9V respectively, the under voltage protection (UVP) function will be
enabled. FPOB will be set to high to turn off the PWM controller IC.
Toggling the PSONB from low to high will reset the fault protection
latch.
The voltage difference across external current shunt is used for
OCP functions. An external resistor can be used to adjust protection
threshold.
The power supply is turned on after 38mS delay time when
PSONB signal is set from high to low. To turn off power supply,
PSONB signal is set from low to high with the delay time 38mS. The
PGI circuitry provides a power-down warning signal for PGO. When
PGI input is lower than the internal 1.20V reference voltage, PGO
signal is pulled low.
SOP-14
CMOS IC
DIP-14
* Pb-free plating product number: 3515AL
FEATURES
* OVP/UVP monitors 3.3V, 5V, 12V input voltage level.
* OCP monitors I
S33
, I
S5
, I
S12
input current sense.
* Fault protection output (FPOB) with Open Drain Output stage.
* Power good output (PGO) with Open Drain Output stage.
* 38ms de-bounce time for PSONB input signal.
* 300ms time delay from PGI to PGO.
* 2.4ms time delay for PSONB to turn off FPOB.
ORDERING INFORMATION
Ordering Number
Normal
Lead Free Plating
3515A-D14-T
3515AL-D14-T
3515A-S14-R
3515AL-S14-R
3515A-S14-T
3515AL-S14-T
Package
DIP-14
SOP-14
SOP-14
Packing
Tube
Tape Reel
Tube
3515AL-D14-T
(1)Packing Type
(2)Package Type
(3)Lead Plating
(1) R: Tape Reel, T: Tube
(2) D14: DIP-14, S14: SOP-14
(3) L: Lead Free Plating, Blank: Pb/Sn
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QW-R502-105,A
3515A
PIN ASSIGNMENT
PGI
GND
FPOB
PSONB
I
S12AB
RI
V
12B
1
2
3
4
5
6
7
14
13
12
11
10
9
8
PGO
V
DD
V
5
V
33
V
12A
I
S33
I
S5
CMOS IC
FUNCTION DESCRIPTION
PGI
PSONB
UV&OC Protection OV Protection
PGI<1.2V
L
No
No
PGI<1.2V
L
No
Yes
PGI<1.2V
L
Yes
No
PGI<1.2V
L
Yes
Yes
PGI>1.2V
L
No
No
PGI>1.2V
L
No
Yes
PGI>1.2V
L
Yes
No
PGI>1.2V
L
Yes
Yes
X
H
X
X
Note: FPOB=L means: fault is not latched. FPOB=H means: fault is latched
PGO=L means: fault. PGO=H means: No fault
X=do not care
FPOB
L
H
L
H
L
H
H
H
H
PGO
L
L
L
L
H
L
L
L
L
PIN DESCRIPTIONS
PIN NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
PIN NAME
PGI
GND
FPOB
PSONB
I
S12AB
RI
V
12B
I
S5
I
S33
V
12A
V
33
V
5
V
DD
PGO
TYPE
Input
Supply
Output
Input
Input
Input
Input
Input
Input
Input
Input
Input
Supply
Output
DESCRIPTION
Power Good Input. For ATX SMPS, it detects AC line voltage through the
main transformer.
Ground
Fault Protection Output. Output signal to control the primary PWM IC through
an opto-coupler. When FPOB is low, the PWM IC is enabled.
Remote On/Off logic input from CPU or main-board. The power supply will
be turned on/off after 38mS delay.
12V
AB
over current protection.
Reference setting. One external resistor Ri connected between RI and GND
pin will determine a reference current, I
REF
= 1.20/Ri, for OCP programming.
12V over/under voltage protection.
5V over current protection.
3.3V over current protection
12V over/under voltage protection.
3.3V over/under voltage protection
5V over/under voltage protection.
Power supply.
Power good logic output, 0 or 1(open-drain). Power good=1 means that the
power supply is good for operation. The power good delay is 300mS.
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QW-R502-105,A
3515A
BLOCK DIAGRAM
CMOS IC
V
cc
+
UN
-
PGO
PGI
Bandgap
Reference
V
REF
=1.2V
I
S33
73
μ
s
debounce
clr
225ms
delay
V
12A
+
-
I
REF
*8
V
S33
+
OV
-
+
UN
-
V
12A
I
S12AB
+
-
I
REF
*8
V
S12A
+
OV
-
+
UN
-
V
12A
+
-
Power On Reset
PWR
73
μs
debounce
RQ
S Q
FPOB
Internal
Power
V
CCI
=3.6V
PSONB
2.4ms
delay
38 ms
debounce
75ms/ 300ms
delay
V
S12B
+
OV
-
+
UN
-
V
12A
PWR
OSC
CLK
I
S5
+
-
I
REF
*8
+
OV
-
+
UN
-
V
12A
V
S5
V
REF
=1.2V
+
-
R
I
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QW-R502-105,A
3515A
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
CMOS IC
RATINGS
UNIT
Supply Voltage, V
DD
, V
12A
-0.3 ~ 16
V
V
5
,V
33
, PSONB, I
S5
, I
S33
-0.3 ~ 7
V
Input Voltage
V
IN
I
S12AB
, V
12B
-0.3 ~ 16
V
V
PGI
-0.3 ~ V
DD
+0.3
FPOB
-0.3 ~ 7
V
Output Voltage
V
OUT
PGO
-0.3 ~ 7
V
Operating Temperature
T
OPR
-40 ~ +125
℃
Storage Temperature
T
STG
-55 ~ +150
℃
Note Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Supply Voltage
V
DD
Supply Voltage
V
CC2
Input Voltage
Output Voltage
Output Sink Current
RI Output Current
Supply Voltage Rising Time (V
DD
)
V
5
,V
33
,PGI ,PSONB
V
12A
, V
12B
FPOB
PGO
FPOB
PGO
SYMBOL
V
DD
V
IN
V
OUT
I
O(SINK)
I
O(RI)
t
R
10
1
MIN
4
9.5
TYP
12
12
MAX
15
15
7
15
7
7
30
10
65
UNIT
V
V
V
V
V
V
mA
mA
uA
ms
ELECTRICAL CHARACTERISTICS
(Ta=25℃ and V
DD
=5V and V
12A
=12V)
PARAMETER
Over Voltage Detection
Over Voltage Threshold
Low Level Output Voltage (FPOB)
Output Leakage Current (FPOB)
PSONB
High-Level Input Voltage
Low-Level Input Voltage
Input Pull-up Current
PGI and PGO
Under Voltage Threshold
Input Threshold Voltage (PGI)
Low Level Output Voltage (PGO)
Output Leakage Current (PGO)
SYMBOL
V
12A,
V
12B
V
5
V
33
V
OL
I
LEAK
V
IH
V
IL
I
IN
I
SINK
=10mA
I
SINK
=30mA
V
(FPOB)
=5V
2
0.8
PSONB=0V
9.5
4.1
2.55
1.16
120
10
4.30
2.69
1.20
10.5
4.47
2.83
1.24
0.4
5
TEST CONDITIONS
MIN
13.2
5.7
3.7
TYP
13.8
6.1
3.9
MAX UNIT
14.4
6.5
4.1
0.3
0.7
5
V
V
V
V
uA
V
V
uA
V
V
V
V
V
uA
V
12A,
V
12B
V
5
V
33
V
I(THD)
V
OL
I
SINK
=10mA
I
LEAK
PGO=5V
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QW-R502-105,A
3515A
ELECTRICAL CHARACTERISTICS (Cont.)
PARAMETER
SWITCHING CHARACTERISTICS
PSONB ON(PSONB Low to FPOB Low)
PSONB OFF(PSONB Hi to PGO Low)
PGI to PGO Delay Time
Timing PGO Low to FPOB high
UVD/OCD Turn on Delay Time
Noise Deglitch Time
Noise Deglitch Time for Latch
TOTAL DEVICE
Low Voltage
Supply Current
SYMBOL
T
(PSONB ON)
T
(PSONB OFF)
T
PG
T
PSOFF
T
UVP1
T
UVP2
t
g1
t
g2
V
DD
I
DD
TEST CONDITIONS
MIN
32
32
200
2.0
65
260
63
63
TYP
38
38
300
2.4
75
300
75
75
3.0
PSONB=5V
CMOS IC
MAX UNIT
62
62
490
4
122
488
120
120
ms
ms
ms
ms
ms
ms
µs
µs
V
mA
V
DD
=5V
V
DD
=5V
V
DD
=5V
V
DD
=5V
FPOB=Low & PGI > 1.2V
FPOB=Low & PGI < 1.2V
1
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QW-R502-105,A
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