POWER SUPPLY PWM SUPERVISOR
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1 偉 詮 電 子 股 份 有 限 公 司 WT7522 POWE SUPPLY PWM SUPEVISO Data Sheet Version 1.10 April 29, 2009 The information in this document is subject to change without notice. All ights eserved. 新 竹 市 科 學 工 業 園 區 工 業 東 九 路 24 號 2 樓 2F, No. 24, Industry E. 9 th D., Science-Based Industrial Park, Hsin-Chu, Taiwan TEL: FAX:
2 GENEAL DESCIPTION WT7522 Data Sheet ev The WT7522 is a pulse width modulation (PWM) control circuit with complete protection circuits for used in the SMPS (Switched Mode Power Supply). It contains various functions, which are Over Voltage Protection, Under Voltage Protection, Power Good Output (PG), emote On/Off control, Opamp and etc. It can minimize external components of switching power supply systems in personal computer. Over Voltage Protection (OVP) monitors 3.3V, 5V, 12V and PT input voltage level. Under Voltage Protection (UVP) monitors 3.3V, 5V, 12V and one negative voltage input voltage level. Power Good Output monitors the voltage level of power supply. FEATUES Complete PWM Control and Protection Circuitry Over Voltage Protection for 3.3V / 5V / V12 / PT 3.3V / 5V / 12V Under Voltage Warning for PG Low Under Voltage Protection for 3.3V / 5V / V12 Two Opamp loop function 300ms PG Time Delay Power Good Output is Open Drain Output Push-pull PWM Output emote ON/OFF function De bounce Time Soft-Start function built-in 20 Pin Dual In line Package PIN CONFIGUATION WT7522 PSON 1 20 V T V5 PT SS VADJ DET 5 16 COMP NVP 6 15 GND V OP1 C IN1 C IN2 PG OP2 Ordering Number Package Type WT7522-NG200WT Green DIP 20 WT7522-NN200WT Pb free DIP 20 Page 2
3 Data Sheet ev PIN DESCIPTION Pin No. Pin Name TYPE FUNCTION 1 PSON I emote on/off input. PSON= low that means the main SMPS is turned-on. PSON= high, the main SMPS is turned-off. 2 V33 I OVP/UVP sense input FO 3.3V. 3 V5 I OVP/UVP sense input for 5V. 4 PT I Over-power sense input. 5 DET I Power good detection input. 6 NVP I UVP sense input for negative voltage. 7 V12 I OVP/UVP sense input for 12V. 8 C2 O PWM totem-pole output. 9 C1 O PWM totem-pole output. 10 PG O Power good signal. PG= high means power good. 11 OP2 O Output for second Opamp loop. 12 IN2 I Input for second Opamp loop. 13 IN1 I Input for first Opamp loop. 14 OP1 O Output for first Opamp loop. 15 GND P Ground 16 COMP O Error amplifier output. 17 VADJ I Input of error amplifier. 18 SS I The soft-start function set through an external capacitor. 19 T I eference setting by an external resistor. 20 P Supply voltage. Page 3
4 Data Sheet ev BLOCK DIAGAM PG DET DET V12 V5 V33 Delay 75/300ms Delay 300ms IN1 NVP UVP VEF VEF OP1 IN2 PT PSON res_p1 50K I1 OPP OVP ON/OFF Delay Delay S rs I2 Q VEF PWM Control IEF OP2 C1 C2 PO PO GND SS VADJ COMP T ABSOLUTE MAXIMUM ATINGS, =5.5V CHAACTEISTICS SYMBOL VALUE Unit Supply voltage 5.5 V Power dissipation Pd 200 mw Operating temperature Topr -25 ~ +85 Storage temperature Tstg -55 ~ +150 V33,V5-0.3 ~ (+0.3) V PIN Voltage PSON,IN1,IN2,PT,DET, T,NVP,VADJ,COMP,PG,SS -0.3 ~ (+0.3) V V12,C1,C2,OP1,OP2-0.3 ~ 16 V I SINK Sink current at OP1,OP2,PG pin 30 ma Page 4
5 Data Sheet ev ELECTICALCHAACTEISTICS,TA=25, V CC =5V, CHAACTEISTICS SYMBOL TEST CONDITION Min. Typ. Max. Unit TOTAL DEVICE STANDBY SUPPLY CUENT I PG=High 5 10 ma EO AMP SECTION OPEN LOOP VOLTAGE GAIN 90 db UNIT GAIN BANDWIDTH 1 MHz EFEENCE VOLTAGE V POTECTION SECTION OVE VOLTAGE POTECTION V V (OVP) V V V V UNDE VOLTAGE SENSE for PG V V Low (UVS) V V V V UNDE VOLTAGE POTECTION V V (UVP) V V V V PT Protection with Delay Time V PT V Negative Voltage Protection (NVP) V NVP Note V NVP Source current I NVP T=75KΩ µa OVP Debounce Time T OVP T =75KΩ ms UVP Debounce Time T UVP T =75KΩ ms UVS Debounce Time T UVS T =75KΩ ms Debounce Timing of NVP T NVP T =75KΩ ms PT Debounce Time T PT T =75KΩ ms Note 1 : V NVP > 2.1 (TYP) => Protection EMOTE ON/OFF SECTION PSON HIGH INPUT VOLTAGE V PSONH 2.0 V PSON LOW INPUT VOLTAGE V PSONL 0.8 V PSON to ON Debounce TIME T PSON_ON T =75KΩ ms PSON to OFF Debounce TIME T PSON_OFF T =75KΩ ms PSON to OFF DELAY TIME T OFF T =75KΩ ms POWE GOOD SECTION DET SENSE VOLTAGE V DET V PG DELAY TIME T PG T =75 KΩ ms OUTPUT LOW VOLTAGE V PGL I PG =5mA 0.5 V SINK CUENT OF PG I PG 30 ma Internal UVP Delay Time (T=75KΩ) V DET > 0.7V ms (Power On Mode) (Note 3) V DET < 0.7V ms UVP disable Voltage (Normal Mode) V DET V DET < 0.7V V Note 3 : When SS go High will enter Power On Mode at first and then jump to Normal Mode when PG are right Page 5
6 Data Sheet ev CHAACTEISTICS SYMBOL TEST CONDITION Min. Typ. Max. Unit SOFT STAT SECTION CHAGE CUENT OF SS I SS T =75 KΩ µa OSCILLATION SECTION OSCILLATION FEQUENCY F OSC T =75KΩ 65 KHZ OPAMP SECTION eference Voltage VEF V SINK CUENT OF OP I OP 30 ma PWM OUTPUT SECTION SINK CUENT OF C1, C2 I C1, I C2 20 ma Output Voltage Low V OL I O =20mA 0.8 V Output Voltage High V OH V12=12V 4 V Page 6
7 Data Sheet ev TIMING DIAGAM 1. PSON ON/OFF: PSON 3.3V/5V/12V NVP T OVP T UVP SS T PSON_ON T PSON_OFF T OFF T NVP PG T PG PSON DET Voltage < V DET PT T PT SS PG Page 7
8 Data Sheet ev APPLICATION : Page 8
9 Data Sheet ev MECHANICAL INFOMATION PLASTIC DUAL IN LINE PACKAGE NOTE 1:All linear dimensions are in inches(millimeters). NOTE 2:This drawing is subject to change without notice. NOTE 3:Falls within JEDEC MS 001 Page 9
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