3521G-D16-T

3521_10 UTC | Alldatasheet

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UNISONIC TECHNOLOGIES CO., LTD

3521 CMOS IC

w w w . u n i s o n i c . c o m . t w 1 of 6 Copyright © 2010 Unisonic Technologies Co., Ltd QW-R502-034.D 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 s upply. Remote ON/OFF control, power good circuitry, some protection features against over-voltage and over-power are implements. „ 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 DIP-16 „ ORDERING INFORMATION Ordering Number Lead Free Plating Halogen Free Package Packing 3521L-D16-T 3521G-D16-T DIP-16 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

UNISONIC TECHNOLOGIES CO., LTD 2 of 6 www.unisonic.com.tw QW-R502-034. D „ PIN CONFIGURATION V33 V12 PT GND CT VADJ OPNEGIN OPOUT DET PG TPG REM VCC „ 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 V CC P Supply Voltage For IC

14 OPOUT O OP AMP Output

15 OPNEGIN I OP AMP Negative Input

16 V ADJ I Voltage Adjust Pin

UNISONIC TECHNOLOGIES CO., LTD 3 of 6 www.unisonic.com.tw QW-R502-034. D „ BLOCK DIAGRAM

UNISONIC TECHNOLOGIES CO., LTD 4 of 6 www.unisonic.com.tw QW-R502-034. D „ ABSOLUTE MAXIMUM RATINGS (VCC=5.5V, unless otherwise specified) PARAMETER SYMBOL RATINGS UNIT Supply Voltage V CC 5.5 V Drain Output Voltage V CC1, VCC2 5.5 V Drain Output Current I CC1, ICC2 200 mA Power Dissipation P D 200 mW Operating Temperature T OPR -10 ~ +70 ℃ Storage Temperature T STG -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 3.5Input Threshold Voltage V I(THR) MAX. DUTY CYCLE 0.1 V ERROR AMP SECTION Opneg Bias Voltage OPNE G OPEN 2.35 2.45 2.55 V Close Loop Voltage Gain G VC 0.5V ~ 3.5V 65 dB Cross Over Point 0dB 320 KHz OUTPUT SECTION Output Saturation Voltage V DSSAT I D=200mA 1.1 1.3 V Drain Off-State Current I D(OFF) V CC=VD=VS=0V 2 10 μA Rising Time t R R PULL-UP=1 KΩ 100 200 ns Falling Time t F R PULL-UP=1 KΩ 50 200 ns PROTECTION SECTION V33 3.8 4.1 4.4 V5 5.8 6.2 6.6 V12 4.38 4.64 4.90Over Voltage Protection (OVP) PT 1.2 1.25 1.3 V V33 1.78 1.98 2.18 V5 2.70 3.00 3.30Under Voltage Protection (UVP) V12 2.11 2.37 2.63 V UVP Disable Voltage P T 0.54 0.62 0.70 V UVP Delay Time tDLY 100 250 500 ms REMOTE ON/OFF SECTION REM High Input Voltage V IH 2.0 V REM Low Input Voltage V IL 0.8 V REM Pull High Voltage V H(PULL) 2.0 5.25 V REM Delay Time tDLY 30 36 42 ms REM Off Delay Time tDLY (OFF) 3.5 4.5 5.5 ms POWER GOOD SECTION Detecting Input Voltage V I(DET) 0.54 0.62 0.70 V Output Saturation Voltage V O(SAT) I PG=10mA 0.2 0.4 V Charging Current For TPG I CHAR 30 μA PG Output Pull-up Resistor R O(PULL-UP)) 5 K Ω PG Output Load Resistor R O(LOAD) 0.5 1 2 K Ω PG Delay Time tDLY C=2.2μF 100 250 500 ms TOTAL DEVICE Standby Supply Current I CC 10 20 mA OSCILLATION SECTION Oscillation Frequency Fosc C T=2200P 50 70 KHz Frequency Change With TEMP. Fosc/T C T=2200P 2 %

UNISONIC TECHNOLOGIES CO., LTD 5 of 6 www.unisonic.com.tw QW-R502-034. D „ FUNCTION DESCRIPTION (1) REMOTE ON/OFF REM REMONF REMON trem trem toff toff (2) Under Voltage Protection Delay Time REM REMONF UVP trem td,uvp (3) Pulse Width Modulation The output pulse width modulation is generated by compar ison of the saw-tooth waveform from the capacitor C T 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 prev enting 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 (V PT>1.25V) or another Disable Under Voltage Protection function (VPT<0.62V).

UNISONIC TECHNOLOGIES CO., LTD 6 of 6 www.unisonic.com.tw QW-R502-034. D „ APPLICATION CIRCUIT UTC 3521 V33 V12 PT GND CT VADJ OPENGIN OUTPUT VCC DET PG TPG REM V33 V5 V12 PT VCC V5 V12 PG VCC REM R1 R2 R10 R11 C1 C2 C3 C5 C6 2.2uF 2200pF 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.