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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. 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.
CMOS IC
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 Lead Free Plating Halogen Free 3521L-D16-T 3521G-D16-T Package DIP-16 Packing Tube
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 (c) 2010 Unisonic Technologies Co., Ltd
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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 VADJ OPNEGIN OPOUT VCC DET PG TPG REM
CMOS IC
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
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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BLOCK DIAGRAM
CMOS IC
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www.unisonic.com.tw
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ABSOLUTE MAXIMUM RATINGS (VCC=5.5V, unless otherwise specified)
CMOS IC
PARAMETER SYMBOL RATINGS UNIT Supply Voltage VCC 5.5 V Drain Output Voltage VCC1, VCC2 5.5 V Drain Output Current ICC1, ICC2 200 mA Power Dissipation PD 200 mW Operating Temperature TOPR -10 ~ +70 Storage Temperature TSTG -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 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 VI(THR) TEST CONDITIONS ZERO DUTY CYCLE MAX. DUTY CYCLE OPNEG OPEN 0.5V ~ 3.5V 0dB ID=200mA VCC=VD=VS=0V R PULL-UP=1 K R PULL-UP=1 K 3.8 5.8 4.38 1.2 1.78 2.70 2.11 0.54 100 2.0 2.0 30 3.5 0.54 IPG=10mA 0.8 5.25 42 5.5 0.70 0.4 2.35 MIN TYP 3.0 0.1 2.45 65 320 1.1 2 100 50 4.1 6.2 4.64 1.25 1.98 3.00 2.37 0.62 250 MAX UNIT 3.5 V V dB KHz V A ns ns
2.55
GVC
VDSSAT ID(OFF) tR tF V33 V5 V12 PT V33 V5 V12 PT tDLY VIH VIL VH(PULL) tDLY tDLY (OFF) VI(DET) VO(SAT) ICHAR
1.3 10 200 200 4.4 6.6 4.90 1.3 2.18 3.30 2.63 0.70 500
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 A K K ms mA KHz % 4 of 6
36 4.5 0.62 0.2 30 5 1 250 10
RO(PULL-UP)) RO(LOAD) tDLY C=2.2F ICC Fosc Fosc/T CT=2200P CT=2200P
0.5 100
2 500 20 70
50 2
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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FUNCTION DESCRIPTION
(1) REMOTE ON/OFF
CMOS IC
REM
REMONF
trem
trem
REMON
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
www.unisonic.com.tw
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APPLICATION CIRCUIT
CMOS IC
V33
V5
V12
PT
V5
V12
R1
R2 V33 V5 V12 VADJ OPENGIN C7 OUTPUT R9
R10
R11
V5 VCC R8 PG
C1
C2
R4
C3
PT GND C4 2200pF CT C1 C2
UTC 3521
VCC DET PG TPG REM C5 2.2uF
VCC
R5 R6
R7 C6
REM
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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