UTC 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 3510 circuits.
CMOS IC
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.
DIP-16
*Pb-free plating product number: 3521L
PIN CONFIGURATION
V33
V5
V12
PT
GND
CT
C1
C2
1
2
3
4
5
6
7
8
UTC 3521
16
15
14
13
12
11
10
9
VADJ
OPNEGIN
OPOUT
V
CC
DET
PG
TPG
REM
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
VCC
OPOUT
OPNEGIN
VADJ
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
UTC
UNISONIC TECHNOLOGIES CO., LTD.
1
QW-R502-034,A
www.unisonic.com.tw
UTC 3521
BLOCK DIAGRAM
(1) V33
(2) V5
(3) V12
-
UV
+
-
UV
+
-
UV
+
UVP
250ms delay
IN
-
OV
+
-
OV
+
-
OV
+
-
OV
+
CLR
OUT
S
OVP
R
QN
Q
CMOS IC
1.25V
(4) PT
0.625V
-
+
QOUT
(9) REM
36mS
Delay
4.5mS
Delay
REMONF
TPG
4k
(10)
REMON
PG
(11)
(12) DET
0.625V
-
+
(6) CT
ERROR AMP
OSC
CLR
PWM CONTROL
PWMCMP
-
+
C1
D
Q
C QN
(7)
(16) VADJ
(15)
OPNEGIN
+
-
2.45V
0.4V
C2
(8)
(14) OPOUT
+
-
DETCMP
DEAD TIME CONTROLER
ABSOLUTE MAXIMUM RATINGS
(Vcc=5.5V, unless otherwise noted.)
PARAMETER
Supply Voltage
Drain output voltage
Drain output current
Power Dissipation
Operating Temperature
Storage Temperature
SYMBOL
V
CC
Vcc1, Vcc2
Icc1, Icc2
P
D
T
opr
T
stg
RATINGS
5.5
5.5
200
200
-10 ~ +70
-65 ~ +150
UNIT
V
V
mA
mW
℃
℃
UTC
UNISONIC TECHNOLOGIES CO., LTD.
2
QW-R502-034,A
www.unisonic.com.tw
UTC 3521
ELECTRICAL CHARACTERISTICS
(Ta=25℃, V
CC
=5V, unless otherwise noted.)
PARAMETER
DEAD TIME CONTROL SECTION
Input Threshold Voltage
ERROR AMP SECTION
Close Loop Voltage Gain
Cross Over Point
Opneg Bias Voltage
OUTPUT SECTION
Output Saturation Voltage
Drain Off-State Current
Rising Time
Falling Time
PROTECTION SECTION
Over Voltage Protection (OVP)
SYMBOL
TEST CONDITIONS
ZERO DUTY CYCLE
MAX. DUTY CYCLE
0.5V ~ 3.5V
0dB
OPNEG OPEN
V
dssat
I
doff
T
r
T
f
V
33
V
5
V
12
P
T
V
33
V
5
V
12
P
T
T
d,uvp
V
remh
V
reml
V
remo
T
rem
T
off
V
det
R
pup.pg
R
pg
I
chg.tpg
T
d.pg
V
sat.pg
Icc
F
osc
F
osc/T
C
T
=2200P
C
T
=2200P
50
2
Id=200mA
Vcc=Vd=Vs=0V
MIN
TYP
3.0
0.1
65
320
2.45
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
0.5
C=2.2μF
I
pg
=10mA
100
4.1
6.2
4.64
1.25
1.98
3.00
2.37
0.62
250
CMOS IC
MAX
3.3
UNIT
V
thdt
V
2.38
2.52
1.3
10
200
200
4.3
6.6
4.90
1.3
2.18
3.30
2.63
0.68
500
dB
KHz
V
V
μA
ns
ns
V
Under Voltage Protection (UVP)
V
V
ms
V
V
V
ms
ms
V
KΩ
KΩ
μA
ms
V
mA
KHz
%
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
PG Output Pull-up Resistor
PG Output Load Resistor
Charging Current For TPG
PG Delay Time
Output Saturation Voltage
TOTAL DEVICE
Standby Supply Current
OSCILLATION SECTION
Oscillation Frequency
Frequency Change With TEMP.
36
4.5
0.62
4
1
30
250
0.2
10
0.8
5.25
42
5.5
0.68
2
500
0.4
20
60
UTC
UNISONIC TECHNOLOGIES CO., LTD.
3
QW-R502-034,A
www.unisonic.com.tw
UTC 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.
UTC
UNISONIC TECHNOLOGIES CO., LTD.
4
QW-R502-034,A
www.unisonic.com.tw
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