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3521_10 [UTC]

PWM CONTROLLER WITH SUPERVISORY CIRCUIT FOR SWITCHING POWER SUPPLY; PWM控制器监控电路用于开关电源
3521_10
型号： 3521_10
厂家： Unisonic Technologies    Unisonic Technologies
描述：

PWM CONTROLLER WITH SUPERVISORY CIRCUIT FOR SWITCHING POWER SUPPLY
PWM控制器监控电路用于开关电源

开关 监控 控制器
文件： 总6页 (文件大小：210K)
中文：  中文翻译
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UNISONIC TECHNOLOGIES CO., LTD  
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. It provides all the functions necessary to monitor and  
control the output of the power supply. Remote ON/OFF control,  
power good circuitry, some protection features against over-voltage  
and over-power are implements.  
DIP-16  
„
FEATURES  
* Over-Voltage Protection for 3.3V, 5V and 12V  
* Under-Voltage Detection for 3.3V, 5V and 12V  
* Over-Power Protection  
* Remote ON/OFF Function  
* Power Good Circuitry  
* Delay Time for PG Signal  
* Delay Time for Over-Voltage and Under-Voltage Protection  
* On-Chip Oscillator and Error Amplifier  
„
ORDERING INFORMATION  
Ordering Number  
Package  
DIP-16  
Packing  
Tube  
Lead Free Plating  
3521L-D16-T  
Halogen Free  
3521G-D16-T  
3521L-D16-T  
(1)Packing Type  
(2)Package Type  
(3)Lead Free  
(1) T: Tube  
(2) D16: DIP-16  
(3) L: Lead Free, G: Halogen Free  
www.unisonic.com.tw  
Copyright © 2010 Unisonic Technologies Co., Ltd  
1 of 6  
QW-R502-034.D  
3521  
CMOS IC  
„
PIN CONFIGURATION  
33  
16  
V
VADJ  
OPNEGIN  
OPOUT  
VCC  
1
2
3
4
5
6
7
8
V5  
15  
14  
13  
12  
11  
10  
9
V12  
PT  
GND  
CT  
DET  
PG  
TPG  
C1  
REM  
C2  
„
PIN DESCRIPTION  
PIN NO.  
PIN NAME  
V33  
TYPE  
FUNCTIONS  
1
2
I
I
OVP/UVP Input For 3.3V  
OVP/UVP Input For 5V  
OVP/UVP Input For 12V  
Additional OVP Protection  
Ground  
V5  
3
V12  
I
4
PT  
I
5
GND  
CT  
P
6
Cap FOR Osciilation Frequency  
Output 1  
7
C1  
O
O
I
8
C2  
Output 2  
9
REM  
TPG  
PG  
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  
10  
11  
12  
13  
14  
15  
16  
O
I
DET  
VCC  
P
O
I
OPOUT  
OPNEGIN  
VADJ  
OP AMP Negative Input  
Voltage Adjust Pin  
I
UNISONIC TECHNOLOGIES CO., LTD  
2 of 6  
QW-R502-034. D  
www.unisonic.com.tw  
3521  
CMOS IC  
„
BLOCK DIAGRAM  
UNISONIC TECHNOLOGIES CO., LTD  
3 of 6  
QW-R502-034. D  
www.unisonic.com.tw  
3521  
CMOS IC  
„
ABSOLUTE MAXIMUM RATINGS (VCC=5.5V, unless otherwise specified)  
PARAMETER  
SYMBOL  
RATINGS  
UNIT  
V
Supply Voltage  
VCC  
5.5  
Drain Output Voltage  
Drain Output Current  
Power Dissipation  
VCC1, VCC  
2
5.5  
V
ICC1, ICC  
2
200  
mA  
mW  
℃
PD  
200  
Operating Temperature  
Storage Temperature  
TOPR  
TSTG  
-10 ~ +70  
-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℃, VCC =5V, unless otherwise specified)  
PARAMETER  
SYMBOL  
TEST CONDITIONS  
MIN TYP MAX UNIT  
DEAD TIME CONTROL SECTION  
ZERO DUTY CYCLE  
3.0  
0.1  
3.5  
Input Threshold Voltage  
VI(THR)  
V
MAX. DUTY CYCLE  
ERROR AMP SECTION  
Opneg Bias Voltage  
Close Loop Voltage Gain  
Cross Over Point  
OPNEG OPEN  
0.5V ~ 3.5V  
0dB  
2.35 2.45 2.55  
V
GVC  
65  
dB  
320  
KHz  
OUTPUT SECTION  
Output Saturation Voltage  
Drain Off-State Current  
Rising Time  
VDSSAT ID=200mA  
ID(OFF) VCC=VD=VS=0V  
tR  
1.1  
2
1.3  
10  
V
μA  
ns  
ns  
R PULL-UP=1 KΩ  
R PULL-UP=1 KΩ  
100  
50  
200  
200  
Falling Time  
tF  
PROTECTION SECTION  
V33  
V5  
3.8  
5.8  
4.1  
6.2  
4.4  
6.6  
Over Voltage Protection (OVP)  
Under Voltage Protection (UVP)  
V
V
V12  
PT  
4.38 4.64 4.90  
1.2 1.25 1.3  
V33  
V5  
1.78 1.98 2.18  
2.70 3.00 3.30  
2.11 2.37 2.63  
0.54 0.62 0.70  
V12  
PT  
UVP Disable Voltage  
V
tDLY  
UVP Delay Time  
100  
250  
500  
ms  
REMOTE ON/OFF SECTION  
REM High Input Voltage  
REM Low Input Voltage  
REM Pull High Voltage  
REM Delay Time  
VIH  
VIL  
2.0  
V
V
0.8  
5.25  
42  
VH(PULL)  
tDLY  
2.0  
30  
V
36  
ms  
ms  
tDLY (OFF)  
REM Off Delay Time  
3.5  
4.5  
5.5  
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  
VI(DET)  
0.54 0.62 0.70  
V
VO(SAT) IPG=10mA  
ICHAR  
0.2  
30  
5
0.4  
V
μA  
KΩ  
KΩ  
ms  
RO(PULL-UP))  
RO(LOAD)  
tDLY  
0.5  
1
2
C=2.2μF  
100  
250  
500  
TOTAL DEVICE  
Standby Supply Current  
OSCILLATION SECTION  
Oscillation Frequency  
Frequency Change With TEMP.  
ICC  
10  
2
20  
70  
mA  
Fosc  
CT=2200P  
50  
KHz  
%
Fosc/T CT=2200P  
UNISONIC TECHNOLOGIES CO., LTD  
4 of 6  
QW-R502-034. D  
www.unisonic.com.tw  
3521  
CMOS IC  
„
FUNCTION DESCRIPTION  
(1) REMOTE ON/OFF  
REM  
REMONF  
REMON  
trem  
trem  
toff  
toff  
(2) Under Voltage Protection Delay Time  
REM  
REMONF  
trem  
UVP  
td,uvp  
(3) Pulse Width Modulation  
The output pulse width modulation is generated by comparison of the saw-tooth waveform from the capacitor CT  
to the feedback of the voltage.  
Therefore, an increase in feedback control signal amplitude causes a linear decrease of the output pulse width.  
(4) 0Protection Control of the Soft-Start  
The soft-start function is to reduce the large current surge during power-up or preventing the output voltages  
(V33/V5/V12) reaches the Over Voltage Protection level.  
(5) The function of PT  
This signal is prepared for extra Over Voltage Protection Input (VPT>1.25V) or another Disable Under Voltage  
Protection function (VPT<0.62V).  
UNISONIC TECHNOLOGIES CO., LTD  
5 of 6  
QW-R502-034. D  
www.unisonic.com.tw  
3521  
CMOS IC  
„
APPLICATION CIRCUIT  
V33  
V5  
V12  
PT  
V12  
V5  
R1  
R2  
R10  
R11  
V33  
V5  
VADJ  
OPENGIN  
OUTPUT  
VCC  
R9  
C7  
V5  
V12  
PT  
C1  
C2  
R4  
C3  
VCC  
UTC  
3521  
R8  
GND  
CT  
DET  
C4  
PG  
PG  
2200pF  
R5  
VCC  
C1  
TPG  
R7  
C2  
REM  
REM  
R6  
C5  
C6  
2.2uF  
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  
6 of 6  
QW-R502-034. D  
www.unisonic.com.tw  

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