3521 [UTC]
CMOS IC; CMOS IC
Unisonic Technologies 
UTC 3521
CMOS IC
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.
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
DIP-16
* Power good circuitry for PCs.
*Pb-free plating product number: 3521L
PIN CONFIGURATION
16
15
V33
V5
VADJ
1
2
3
4
OPNEGIN
OPOUT
VCC
V12
PT
14
13
12
11
10
9
UTC 3521
GND
CT
5
6
7
8
DET
PG
TPG
REM
C1
C2
PIN DESCRIPTION
PIN NO.
PIN NAME
V33
TYPE
FUNCTIONS
1
2
3
I
I
I
OVP/UVP INPUT FOR 3.3V
OVP/UVP INPUT FOR 5V
OVP/UVP INPUT FOR 12V
V5
V12
4
5
6
7
8
9
10
11
12
13
14
15
16
PT
GND
CT
C1
C2
REM
TPG
PG
I
P
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
O
O
I
O
I
P
O
I
DET
VCC
OPOUT
OPNEGIN
VADJ
OP AMP NEGATIVE INPUT
VOLTAGE ADJUST PIN
I
UTC UNISONIC TECHNOLOGIES CO., LTD.
1
www.unisonic.com.tw
QW-R502-034,A
UTC 3521
CMOS IC
BLOCK DIAGRAM
-
UV
UV
UV
(1)
(2)
V33
V5
+
-
+
-
+
UVP
OVP
(3)
V12
250ms delay
OUT
IN
CLR
-
+
S
Q
OV
OV
OV
OV
R
QN
-
+
-
+
-
+
1.25V
-
+
(4)
PT
0.625V
QOUT
REMONF
REMON
36mS
Delay
(10)
(11)
TPG
PG
(9) REM
4.5mS
Delay
4k
-
+
(12)
DET
0.625V
OSC
CLR
(6)
CT
C1
C2
(7)
(8)
PWM CONTROL
PWMCMP
D
C
Q
ERROR AMP
+
-
+
(16)
VADJ
QN
-
(15)
OPNEGIN
2.45V
0.4V
+
-
(14)
OPOUT
DETCMP
DEAD TIME CONTROLER
ABSOLUTE MAXIMUM RATINGS
(Vcc=5.5V, unless otherwise noted.)
PARAMETER
SYMBOL
VCC
RATINGS
5.5
UNIT
Supply Voltage
V
V
Drain output voltage
Drain output current
Power Dissipation
Vcc1, Vcc2
Icc1, Icc2
PD
5.5
200
mA
mW
℃
200
Operating Temperature
Storage Temperature
Topr
-10 ~ +70
-65 ~ +150
℃
Tstg
UTC UNISONIC TECHNOLOGIES CO., LTD.
2
www.unisonic.com.tw
QW-R502-034,A
UTC 3521
ELECTRICAL CHARACTERISTICS
CMOS IC
(Ta=25℃, VCC =5V, unless otherwise noted.)
PARAMETER
SYMBOL
TEST CONDITIONS
ZERO DUTY CYCLE
MIN
TYP
MAX
3.3
UNIT
V
DEAD TIME CONTROL SECTION
Input Threshold Voltage
3.0
0.1
Vthdt
MAX. DUTY CYCLE
ERROR AMP SECTION
Close Loop Voltage Gain
Cross Over Point
0.5V ~ 3.5V
0dB
65
dB
KHz
V
320
2.45
Opneg Bias Voltage
OUTPUT SECTION
Output Saturation Voltage
Drain Off-State Current
Rising Time
OPNEG OPEN
2.38
2.52
Vdssat
Idoff
Tr
Id=200mA
1.1
2
1.3
10
V
μA
Vcc=Vd=Vs=0V
100
50
200
200
ns
ns
Falling Time
Tf
PROTECTION SECTION
Over Voltage Protection (OVP)
V33
V5
3.8
5.8
4.1
6.2
4.3
6.6
V
V
V12
PT
4.41
1.2
4.64
1.25
1.98
3.00
2.37
0.62
250
4.90
1.3
Under Voltage Protection (UVP)
V33
V5
V12
PT
1.78
2.70
2.11
0.55
100
2.18
3.30
2.63
0.68
500
UVP Disable Voltage
V
UVP Delay Time
Td,uvp
ms
REMOTE ON/OFF SECTION
REM High Input Voltage
REM Low Input Voltage
REM Pull High Voltage
REM Delay Time
Vremh
Vreml
Vremo
Trem
Toff
2.0
V
V
0.8
5.25
42
2.0
30
V
36
ms
ms
REM Off Delay Time
3.5
4.5
5.5
POWER GOOD SECTION
Detecting Input Voltage
PG Output Pull-up Resistor
PG Output Load Resistor
Charging Current For TPG
PG Delay Time
Vdet
Rpup.pg
Rpg
0.55
0.5
0.62
4
0.68
2
V
KΩ
KΩ
μA
1
Ichg.tpg
Td.pg
30
250
0.2
C=2.2μF
100
500
0.4
ms
V
Output Saturation Voltage
TOTAL DEVICE
Vsat.pg
Ipg=10mA
Standby Supply Current
OSCILLATION SECTION
Oscillation Frequency
Frequency Change With TEMP.
Icc
10
2
20
60
mA
Fosc
CT=2200P
CT=2200P
50
KHz
%
Fosc/T
UTC UNISONIC TECHNOLOGIES CO., LTD.
3
www.unisonic.com.tw
QW-R502-034,A
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
www.unisonic.com.tw
QW-R502-034,A
相关型号：
©2020 ICPDF网 联系我们和版权申明