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伟诠电子股份有限公司 Weltrend Semiconductor, Inc.WT7522POWER SUPPLY PWM SUPERVISOR Data Sheet Version 0.3 February 11, 2009The information in this document is subject to change without notice. Weltrend Semiconductor, Inc. All Rights Reserved.新竹市科学工业园区工业东九 24 号 2
2F, No. 24, Industry E. 9th RD., Science-Based Industrial Park, Hsin-Chu, Taiwan TEL:886-3-5780241 FAX:886-3-0419 Email:.twWT7522Data Sheet Rev. 0.3GENERAL DESCRIPTIONThe WT7522 is a pulseCwidth 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), Remote 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.FEATURES
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 Remote ON/OFF function DeCbounce Time Soft-Start function built-in 20CPin Dual InCline PackagePIN CONFIGURATIONWT7522 PSON V33 V5 PT DET NVP V12 C2 C1 PG1 2 3 4 5 6 7 8 9 1020 19 18 17 16 15 14 13 12 11VCC RT SS VADJ COMP GND OP1 IN1 IN2 OP2Ordering Number WT7522-NG200WTPackage Type DIP 20Weltrend Semiconductor, Inc.Page 2WT7522Data Sheet Rev. 0.3PIN DESCRIPTIONPin No. Pin Name 1 PSON 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 V33 V5 PT DET NVP V12 C2 C1 PG OP2 IN2 IN1 OP1 GND COMP VADJ SS RT VCC TYPE I I I I I I I O O O O I I O P O I I I P FUNCTION Remote on/off input. PSON=&low& that means the main SMPS is turned-on. PSON=&high&, the main SMPS is turned-off. OVP/UVP sense input FOR 3.3V. OVP/UVP sense input for 5V. Over-power sense input. Power good detection input. UVP sense input for negative voltage. OVP/UVP sense input for 12V. PWM totem-pole output. PWM totem-pole output. Power good signal. PG= &high& means &power good&. Output for second Opamp loop. Input for second Opamp loop. Input for first Opamp loop. Output for first Opamp loop. Ground Error amplifier output. Input of error amplifier. The soft-start function set through an external capacitor. Reference setting by an external resistor. Supply voltage.Weltrend Semiconductor, Inc.Page 3WT7522Data Sheet Rev. 0.3BLOCK DIAGRAMVCC DET R DET Delay 75/300ms RVCCPGDelay 300ms RV12 V5 V33VCCIN1NVP UVP R VREFVREFOP1 IN2rs S Q VREFOVP R PTOP2ROPP RI2C1 PWM Control RVCCVCC res_p1 50K I1C2VCC ON/OFF Delay R PORPORPSONRDelay IREFGNDSS VADJCOMPRTABSOLUTE MAXIMUM RATINGS, VCC=5.5VCHARACTERISTICS Supply voltage Power dissipation Operating temperature Storage temperature SYMBOL VCC Pd Topr Tstg V33,V5 PSON,IN1,IN2,PT,DET, RT,NVP,VADJ,COMP,PG,SS V12,C1,C2,OP1,OP2 Sink current at OP1,OP2,PG pin VALUE 5.5 200 -25 ~ +85 -55 ~ +150 -0.3 ~ (VCC+0.3) -0.3 ~ (VCC+0.3) -0.3 ~ 16 30 Unit V mW ℃ ℃ V V V mAPIN Voltage ISINKWeltrend Semiconductor, Inc.Page 4WT7522Data Sheet Rev. 0.3ELECTRICALCHARACTERISTICS,TA=25℃, VCC=5V,CHARACTERISTICS TOTAL DEVICE STANDBY SUPPLY CURRENT ERROR AMP SECTION OPEN LOOP VOLTAGE GAIN UNIT GAIN BANDWIDTH REFERENCE VOLTAGE PROTECTION SECTION OVER VOLTAGE PROTECTION V33 (OVP) V5 V12 UNDER VOLTAGE SENSE for PG V33 Low (UVS) V5 V12 UNDER VOLTAGE PROTECTION V33 (UVP) V5 V12 PT Protection with Delay Time VPT Negative Voltage Protection (NVP) VNVP NVP Source current INVP OVP Debounce Time TOVP UVP Debounce Time TUVP UVS Debounce Time TUVS Debounce Timing of NVP TNVP PT Debounce Time TPT Note 1 : VNVP & 2.1 (TYP) =& Protection REMOTE ON/OFF SECTION PSON HIGH INPUT VOLTAGE PSON LOW INPUT VOLTAGE PSON to ON Debounce TIME PSON to OFF Debounce TIME PSON to OFF DELAY TIME VPSONH VPSONL TPSON_ON TPSON_OFF TOFF SYMBOL TEST CONDITION Min. Typ. Max. UnitIVCCPG=High510mA2.4690 1 2.52.54dB MHz VNote 1 RT=75K RT =75K RT =75K RT =75K RT =75K RT =75K3.9 5.8 13.9 2.5 4.0 9.4 2.0 3.0 6.0 2.02 2.0 63 0.37 0.8 0.37 1.65 1.654.1 6.1 14.5 2.8 4.3 10.1 2.6 3.6 7.2 2.4 2.1 67 0.7 2.4 1.2 3.5 3.54.3 6.5 14.9 3.0 4.5 10.4 2.8 3.9 8.0 2.66 2.2 71 1.35 3.75 1.88 5.1 5.1V V V V V V V V V V V μA ms ms ms ms ms2.0 RT =75K RT =75K RT =75K 30 7 1.5 40 14 2 0.8 50 21 6.3V V ms ms msPOWER GOOD SECTION 0.68 0.7 0.72 V DET SENSE VOLTAGE VDET PG DELAY TIME TPG RT =75 K 200 300 400 ms OUTPUT LOW VOLTAGE VPGL IPG=5mA 0.5 V SINK CURRENT OF PG IPG 30 mA Internal UVP Delay Time (RT=75K) VDET & 0.7V 50 75 100 ms (Power On Mode) (Note 3) VDET & 0.7V 200 300 400 ms UVP disable Voltage (Normal Mode) VDET VDET & 0.7V 0.68 0.7 0.72 V Note 3 : When SS go High will enter Power On Mode at first and then jump to Normal Mode when PG are rightWeltrend Semiconductor, Inc.Page 5WT7522Data Sheet Rev. 0.3CHARACTERISTICS SOFT START SECTION CHARGE CURRENT OF SS SYMBOL TEST CONDITION Min. Typ. Max. UnitISSRT =75 K789μAOSCILLATION SECTION OSCILLATION FREQUENCY OPAMP SECTION Reference Voltage SINK CURRENT OF OP PWM OUTPUT SECTION SINK CURRENT OF C1, C2 Output Voltage Low Output Voltage HighFOSCRT =75K65KHZVREF IOP2.4752.52.525 30V mAIC1, IC2 VOL VOHIO=20mA V12=12V20 0.8 4mA V VWeltrend Semiconductor, Inc.Page 6WT7522Data Sheet Rev. 0.3TIMING DIAGRAM1. PSON ON/OFF:VCCPSON3.3V/5V/12V TOVP NVP TOFF SS TPSON_ON TPSON_OFF TNVP TUVPPGTPGVCCPSON Voltage & VDET DETPT TPT SSPGWeltrend Semiconductor, Inc.Page 7WT7522Data Sheet Rev. 0.3 APPLICATION :Weltrend Semiconductor, Inc.Page 8WT7522Data Sheet Rev. 0.3MECHANICAL INFORMATIONPLASTIC DUALCINCLINE PACKAGENOTE 1:All linear dimensions are in inches(millimeters). NOTE 2:This drawing is subject to change without notice. NOTE 3:Falls within JEDEC MSC001Weltrend Semiconductor, Inc.Page 9
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