UNISONIC TECHNOLOGIES CO., LTD
3521
PWM CONTROLLER WITH
SUPERVISORY CIRCUIT FOR
SWITCHING POWER SUPPLY
DESCRIPTION
UTC
3521
PWM controller is designed for switching mode power
supply for PCs etc. It provides all the functions similar to
combinations of industrial 494 plus UTC 3510 circuits.
CMOS IC
DIP-16
FEATURES
* Over-voltage protection for 3.3V, 5V and 12V with delay
* Under-voltage detection for 3.3V, 5V and 12V with delay
* Remote ON/OFF function
* Power good circuitry for PCs.
*Pb-free plating product number: 3521L
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
3521-D16-T
3521L-D16-T
Package
DIP-16
Packing
Tube
3521L-D16-T
(1)Packing Type
(2)Package Type
(3)Lead Plating
(1) T: Tube
(2) D16: DIP-16
(3) L: Lead Free Plating, Blank: Pb/Sn
www.unisonic.com.tw
Copyright © 2005 Unisonic Technologies Co., Ltd
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QW-R502-034,B
3521
PIN CONFIGURATION
V33
V5
V12
PT
GND
CT
C1
C2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
ADJ
OPNEGIN
OPOUT
V
CC
DET
PG
TPG
REM
CMOS IC
UTC
3521
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
PIN NAME
V33
V5
V12
PT
GND
CT
C1
C2
REM
TPG
PG
DET
V
CC
OPOUT
OPNEGIN
V
ADJ
TYPE
I
I
I
I
P
O
O
I
O
I
P
O
I
I
FUNCTIONS
OVP/UVP INPUT FOR 3.3V
OVP/UVP INPUT FOR 5V
OVP/UVP INPUT FOR 12V
ADDITIONAL OVP PROTECTION
GROUND
CAP FOR OSCIILATION FREQUENCY
OUTPUT 1
OUTPUT 2
REMOTE ON/OFF PIN.
POWER GOOD DELAY TIME SETTING
POWER GOOD SIGNAL OUT.
POWER GOOD SIGNAL DETECTION INPUT
SUPPLY VOLTAGE FOR IC
OP AMP OUTPUT
OP AMP NEGATIVE INPUT
VOLTAGE ADJUST PIN
UNISONIC TECHNOLOGIES CO., LTD
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QW-R502-034,B
3521
BLOCK DIAGRAM
(1) V33
(2) V5
(3) V12
-
+UV
-
+UV
-
+UV
UVP
250ms delay
IN
-
+OV
-
+OV
-
+OV
1.25V
(4)
PT
0.625V
36ms
Delay
-
OV
+
-
+
QOUT
REMONF
4.5 ms REMON
Delay
(12 DET
)
0. 625V
-
+
OSC
CLR
ERROR AMP
+
-
2.45V
(14) OPOUT
4k
OVP
OUT
CLR
S
Q
QN R
CMOS IC
(9) REM
TPG
PG
(10)
(11)
(6) CT
(16) V
ADJ
(15) OPNEGIN
PWM
CONTROL
PWMCMP
-
+
0.4V
+
-
D Q
C QN
C1
C2
(7)
(8)
DETCMP
DEAD TIME CONTROLER
UNISONIC TECHNOLOGIES CO., LTD
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QW-R502-034,B
3521
ABSOLUTE MAXIMUM RATINGS
(V
CC
=5.5V, unless otherwise specified)
PARAMETER
CMOS IC
SYMBOL
RATINGS
UNIT
Supply Voltage
V
CC
5.5
V
Drain Output Voltage
V
CC
1, V
CC
2
5.5
V
Drain Output Current
I
CC
1, I
CC
2
200
mA
Power Dissipation
P
D
200
mW
Operating Temperature
T
OPR
-10 ~ +70
℃
Storage Temperature
T
STG
-65 ~ +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.
ELECTRICAL CHARACTERISTICS
(Ta=25℃, V
CC
=5V, unless otherwise specified)
PARAMETER
DEAD TIME CONTROL SECTION
Input Threshold Voltage
ERROR AMP SECTION
Opneg Bias Voltage
Close Loop Voltage Gain
Cross Over Point
OUTPUT SECTION
Output Saturation Voltage
Drain Off-State Current
Rising Time
Falling Time
PROTECTION SECTION
Over Voltage Protection (OVP)
SYMBOL
V
I(THR)
TEST CONDITIONS
ZERO DUTY CYCLE
MAX. DUTY CYCLE
OPNEG OPEN
0.5V ~ 3.5V
0dB
I
D
=200mA
V
CC
=V
D
=V
S
=0V
2.38
MIN
TYP
3.0
0.1
2.45
65
320
1.1
2
100
50
3.8
5.8
4.41
1.2
1.78
2.70
2.11
0.55
100
2.0
2.0
30
3.5
0.55
I
PG
=10mA
0.8
5.25
42
5.5
0.68
0.4
4.1
6.2
4.64
1.25
1.98
3.00
2.37
0.62
250
MAX UNIT
3.3
V
V
dB
KHz
V
µA
ns
ns
2.52
G
VC
V
DSSAT
I
D(OFF)
t
R
t
F
V33
V5
V12
P
T
V33
V5
V12
P
T
t
DLY
V
IH
V
IL
V
H(PULL)
t
DLY
t
DLY (OFF)
V
I(DET)
V
O(SAT)
I
CHAR
1.3
10
200
200
4.3
6.6
4.90
1.3
2.18
3.30
2.63
0.68
500
V
Under Voltage Protection (UVP)
UVP Disable Voltage
UVP Delay Time
REMOTE ON/OFF SECTION
REM High Input Voltage
REM Low Input Voltage
REM Pull High Voltage
REM Delay Time
REM Off Delay Time
POWER GOOD SECTION
Detecting Input Voltage
Output Saturation Voltage
Charging Current For TPG
PG Output Pull-up Resistor
PG Output Load Resistor
PG Delay Time
TOTAL DEVICE
Standby Supply Current
OSCILLATION SECTION
Oscillation Frequency
Frequency Change With TEMP.
V
V
ms
V
V
V
ms
ms
V
V
µA
KΩ
KΩ
ms
mA
KHz
%
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36
4.5
0.62
0.2
30
4
1
250
10
R
O(PULL-UP))
R
O(LOAD)
t
DLY
C=2.2µF
I
CC
Fosc
Fosc/T
C
T
=2200P
C
T
=2200P
0.5
100
2
500
20
60
50
2
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
QW-R502-034,B
3521
CMOS IC
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R502-034,B
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