3521_05资料

UNISONIC TECHNOLOGIES CO., LTD

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.

3521 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

Package Packing Normal Lead Free Plating

3521-D16-T 3521L-D16-T DIP-16 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

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Copyright © 2005 Unisonic Technologies Co., Ltd

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QW-R502-034,B

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3521 CMOS IC

󰂄 PIN CONFIGURATION

V33V5V12PTGNDCTC1C2

12345678161514131211109VADJOPNEGINOPOUTVCCDETPGTPGREMUTC 3521

󰂄 PIN DESCRIPTION

PIN NO. PIN NAME TYPE FUNCTIONS

1 V33 I OVP/UVP INPUT FOR 3.3V 2 V5 I OVP/UVP INPUT FOR 5V 3 V12 I OVP/UVP INPUT FOR 12V 4 PT I ADDITIONAL OVP PROTECTION 5 GND P GROUND 6 CT CAP FOR OSCIILATION FREQUENCY 7 C1 O OUTPUT 1 8 C2 O OUTPUT 2 9 REM I REMOTE ON/OFF PIN. 10 TPG POWER GOOD DELAY TIME SETTING 11 PG O POWER GOOD SIGNAL OUT. 12 DET I POWER GOOD SIGNAL DETECTION INPUT 13 VCC P SUPPLY VOLTAGE FOR IC 14 OPOUT O OP AMP OUTPUT 15 OPNEGIN I OP AMP NEGATIVE INPUT 16 VADJ I VOLTAGE ADJUST PIN

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3521 CMOS IC

󰂄 BLOCK DIAGRAM

(1)V33(2)V5(3)V12-+UV-+UV-+UVUVP250ms delayIN-+OV-+OV-+OV1.25V(4)PT0.625V36msDelay-OV+-+QOUTREMONF4.5msREMONDelay(12)DET0.625V-+OSCCLRERROR AMP+-2.45V(14)OPOUT4kTPG(10)OVPOUTCLRSQ QN R (9)REMPG(11)(6)CT(16)VADJ(15)OPNEGINPWM CONTROLPWMCMP-+0.4V+-QD QNC C1C2(7)(8)DETCMP DEAD TIME CONTROLER

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3521 CMOS IC

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󰂄 ABSOLUTE MAXIMUM RATINGS (VCC=5.5V, unless otherwise specified)

PARAMETER SYMBOLRATINGS UNIT =Supply Voltage VCC 5.5 V Drain Output Voltage VCC1, VCC25.5 V Drain Output Current ICC1, ICC2200 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 SYMBOLDEAD TIME CONTROL SECTION Input Threshold Voltage

VI(THR)

TEST CONDITIONS MIN TYP MAXUNIT

ZERO DUTY CYCLE

MAX. DUTY CYCLE

3.0 0.1

3.3

V

ERROR AMP SECTION ==Opneg Bias Voltage OPNEG OPEN 2.38 2.45 2.52V

Close Loop Voltage Gain GVC 0.5V ~ 3.5V 65 dBCross Over Point 0dB 320 KHzOUTPUT SECTION

Output Saturation Voltage VDSSAT ID200mA 1.1 1.3V Drain Off-State Current ID(OFF) VCC=VD=VS0V 2 10 µARising Time tR 100 200ns Falling Time tF 50 200ns PROTECTION SECTION

V33 3.8 4.1 4.3V5 5.8 6.2 6.6Over Voltage Protection (OVP) V

V12 4.41 4.64 4.90PT 1.2 1.25 1.3V33 1.78 1.98 2.18

Under Voltage Protection (UVP) V V5 2.70 3.00 3.30

V12 2.11 2.37 2.63

UVP Disable Voltage PT 0.55 0.62 0.68V tDLY 100 250 500msUVP Delay Time

REMOTE ON/OFF SECTION REM High Input Voltage VIH 2.0 V REM Low Input Voltage VIL 0.8V REM Pull High Voltage VH(PULL) 2.0 5.25V

tDLY 30 36 42 msREM Delay Time

tDLY (OFF) REM Off Delay Time 3.5 4.5 5.5ms

POWER GOOD SECTION Detecting Input Voltage VI(DET) 0.55 0.62 0.68V Output Saturation Voltage VO(SAT) IPG10mA 0.2 0.4V Charging Current For TPG ICHAR 30 µAPG Output Pull-up Resistor RO(PULL-UP)) 4 KΩPG Output Load Resistor RO(LOAD) 0.5 1 2 KΩ

tDLY C2.2µF 100 250 500msPG Delay Time

TOTAL DEVICE

Standby Supply Current ICC 10 20 mAOSCILLATION SECTION Oscillation Frequency Fosc CT2200P 50 60 KHzFrequency Change With TEMP. Fosc/T CT2200P 2 % www.unisonic.com.tw QW-R502-034,B UNISONIC TECHNOLOGIES CO., LTD 4 of 5 元器件交易网www.cecb2b.com

3521 CMOS IC

UTC assumes no responsibility for equipment failures that result from using products at values thatexceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, orother parameters) listed in products specifications of any and all UTC products described or containedherein. UTC products are not designed for use in life support appliances, devices or systems wheremalfunction of these products can be reasonably expected to result in personal injury. Reproduction inwhole or in part is prohibited without the prior written consent of the copyright owner. The informationpresented in this document does not form part of any quotation or contract, is believed to be accurateand reliable and may be changed without notice. www.unisonic.com.tw QW-R502-034,B UNISONIC TECHNOLOGIES CO., LTD 5 of 5