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 * Power good circuitry for PCs. DIP-16 *Pb-free plating product number: 3521L PIN CONFIGURATION V33 1 16 VADJ V5 2 15 OPNEGIN V12 3 14 OPOUT PT 4 13 VCC GND 5 12 DET CT 6 11 PG C1 7 10 TPG C2 8 9 REM UTC 3521 PIN DESCRIPTION PIN NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 UTC 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 1 QW-R502-034,A UTC 3521 CMOS IC BLOCK DIAGRAM (1) V33 UV + (2) V5 UV + (3) V12 UV + UVP 250ms delay IN OV + CLR OUT S Q OVP R QN OV + OV + OV + 1.25V (4) PT + 0.625V QOUT REMONF 36mS Delay (9) REM 4.5mS Delay (12) DET TPG (10) PG (11) C1 (7) C2 (8) REMON 4k + 0.625V OSC CLR (6) CT PWM CONTROL PWMCMP ERROR AMP (16) VADJ + + (15) OPNEGIN D Q C QN 2.45V 0.4V + - (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 UTC SYMBOL VCC Vcc1, Vcc2 Icc1, Icc2 PD Topr Tstg RATINGS 5.5 5.5 200 200 -10 ~ +70 -65 ~ +150 UNISONIC TECHNOLOGIES CO., LTD. www.unisonic.com.tw UNIT V V mA mW ℃ ℃ 2 QW-R502-034,A UTC 3521 CMOS IC ELECTRICAL CHARACTERISTICS (Ta=25℃, VCC =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) 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 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. UTC SYMBOL Vthdt Vdssat Idoff Tr Tf TEST CONDITIONS MIN TYP MAX ZERO DUTY CYCLE MAX. DUTY CYCLE 3.0 0.1 3.3 0.5V ~ 3.5V 0dB OPNEG OPEN 65 320 2.45 2.52 1.1 2 100 50 1.3 10 200 200 4.1 6.2 4.64 1.25 1.98 3.00 2.37 0.62 250 4.3 6.6 4.90 1.3 2.18 3.30 2.63 0.68 500 V ms 36 4.5 0.8 5.25 42 5.5 V V V ms ms 2.38 Id=200mA Vcc=Vd=Vs=0V V33 V5 V12 PT V33 V5 V12 PT Td,uvp 3.8 5.8 4.41 1.2 1.78 2.70 2.11 0.55 100 Vremh Vreml Vremo Trem Toff 2.0 Vdet Rpup.pg Rpg Ichg.tpg Td.pg Vsat.pg 0.55 2.0 30 3.5 0.5 C=2.2μF 100 Ipg=10mA Icc Fosc Fosc/T CT=2200P CT=2200P www.unisonic.com.tw V dB KHz V V μA ns ns V V 0.62 4 1 30 250 0.2 0.68 500 0.4 ms V 10 20 mA 60 KHz % 50 UNISONIC TECHNOLOGIES CO., LTD. UNIT 2 2 V KΩ KΩ μA 3 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. www.unisonic.com.tw 4 QW-R502-034,A