PC POWER SUPPLY PWM SUPERVISOR
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1 WT7520 PC POWER SUPPLY PWM SUPERVISOR Data Sheet REV. 0.9 February 21, 2005 The information in this document is subject to change without notice. All Rights Reserved. 2F, No. 24, Industry E. 9 th RD., ScienceBased Industrial Park, HsinChu, Taiwan TEL: FAX: support@weltrend.com.tw
2 GENERAL DESCRIPTION The WT7520 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 (PGO), Remote On/Off control 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 and 12V 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 / 12V / PT Under Voltage Protection for 3.3V / 5V / 12V 280ms PG Time Delay Power Good Output is Open Drain Output PWM Control Output are Open Drain Output 280 ms Time Delay for UVP Remote ON/OFF function De bounce Time SoftStart function builtin 16 Pin Dual In line Package PIN CONFIGURATION 7520 V VADJ V OPNEGIN V OPOUT PT 4 13 VCC GND 5 12 DET RT 6 11 PG C SS C2 8 9 REM Ordering Number WT7520 DIP 16 Package Type Page 2
3 PIN DESCRIPTION Pin No. Pin Name TYPE FUNCTION 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 Extra OVP protection input. 5 GND P Ground. 6 RT O Oscillation frequency set by external resistor. 7 C1 O PWM open drain output 1. 8 C2 O PWM open drain output 2. 9 REM I Remote on/off input. REM= low that means the main SMPS is turnedon. REM= high, the main SMPS is turnedoff. 10 SS O Soft start function set by external capacitor. 11 PG O Power good signal. PG= high means power good. PG= low means power fail. 12 DET I Extra protection input. 13 VCC P Supply voltage. 14 OPOUT O OP compensation output. 15 OPNEGIN I OP compensation negative input. 16 VADJ I OP compensation positive input, feedback voltage sense input. *The difference between WT7905 and WT7520 ITEM WT7905 WT7520 Pin6 (PWM frequency) CT; external capacitor RT; external resistor (ex. 120k ) Pin10 TPG; external capacitor (PG delaytime function) SS; external capacitor (Softstart function) OVP3.3V,5V,12V 100us (Typ.) 510us (Typ.) UVP3.3V,5V,12V 100us (Typ.) 110us (Typ.) SoftStart function Set by internal circuit Set by external capacitor (Pin10:SS) Pin4 (PT) PT default 0.8V (with internal voltage divided resistors) PT default 0.8V. (with internal voltage divided resistors) (24K4.6K) Page 3
4 BLOCK DIAGRAM [1] V33 UV [2] V5 UV [3] V12 UV UVP 110us 280ms delay OV OV OVP 510us IN CLR OUT S R Q OV OV [4] PT 0.62V 280ms delay QOUT 5K PG [11] IN OUT [9] [12] REM DET 0.62V 36mS Delay 4.5mS Delay REMONF REMON Vss SS [10] [6] [16] [15] RT VADJ OPNEGIN 2.45V ERROR AMP OSC CLR PWM CONTROL PWMCMP D C Q QN C1 C2 [7] [8] [14] OPOUT DETCMP SOFT_START CONTROLLER ABSOLUTE MAXIMUM RATINGS, VCC=5.5V CHARACTERISTICS SYMBOL VALUE Unit Supply voltage VCC 5.5 V Drain output voltage Vcc1, Vcc2 5.5 V Drain output current Icc1, Icc2 200 Power dissipation Pd 200 mw Operating temperature Topr 10 ~ 70 Storage temperature Tstg 65 ~ 150 Page 4
5 ELECTRICALCHARACTERISTICS,TA=25 V CC =5V, CHARACTERISTICS SYMBOL TEST CONDITION Min. Typ. Max. Unit DEAD TIME CONTROL SECTION INPUT THRESHOLD VOLTAGE Vthdt ZERO DUTY CYCLE MAX. DUTY CYCLE 0.1 ERROR AMP SECTION CLOSE LOOP VOLTAGE GAIN 0.5V ~ 3.5V 65 CROSS OVER POINT 0dB 320 OPNEG BIAS VOLTAGE OPNEG OPEN OUTPUT SECTION OUTPUT SATURATION VOLTAGE Vdssat Id=200mA DRAIN OFFSTATE CURRENT Idoff Vcc=Vd=Vs=0V 2 10 RISING TIME Tr FALLING TIME Tf PROTECTION SECTION OVER VOLTAGE PROTECTION OVP V V V PT UNDER VOLTAGE PROTECTION V UVP V V UVP DISABLE VOLTAGE PT UVP DELAY TIME Td.uvp REMOTE ON/OFF SECTION REM HIGH INPUT VOLTAGE Vremh 2.0 REM LOW INPUT VOLTAGE Vreml 0.8 REM PULL HIGH VOLTAGE Vremo REM DELAY TIME Trem REM OFF DELAY TIME Toff POWER GOOD SECTION DETECTING INPUT VOLTAGE Vdet PG OUTPUT PULL UP RESISTOR Rpup, pg 5 Ω PG OUTPUT LOAD RESISTOR Rpg Ω PG DELAY TIME OUTPUT SATURATION VOLTAGE Vsat.pg Ipg=10mA SOFT START SECTION SINK CURRENT OF SS Iss.sink 13 SOURCE CURRENT OF SS Iss.source 700 TOTAL DEVICE STANDBY SUPPLY CURRENT Icc OSCILLATION SECTION OSCILLATION FREQUENCY Fosc RT=120K Page 5
6 APPLICATION NOTE 1. Input impedance: Pin No. Pin Name Input impedance 1 V33 47K 2 V5 73K 3 V12 47K 4 PT 24 K 4.6 K 2. Sawtooth OSC. Funcition: Page 6
7 3.REMOTE ON/OFF REM REMONF trem trem REMON toff toff SS 4. Under Voltage Protection Delay Time REM REMON UVP td,uvp 5. Pulse Width Modulation Block The output pulse width modulation is generated by comparision of the saw tooth waveform from the capacitor C T to the feedback of the voltage. Therefore, an increase in feedback control signal amplitude cause a linear decrease of the output pulse width. Also, the SS(DTC and SoftStart) limits the output pulse width. The timing diagram is shown as below: CT DTC PWM OUT FFCLK FFQ FFQN C1 C2 Page 7
8 6. The function of PT : This signal is prepared for extra OVP/OPP (V PT > 1.25V) or another Disable Under Voltage Protection function (V PT < 0.62V) 7. Reference Application Ciruit: 8. In some application power system, adding an external resistor (R9) could reduce the peak value spike from the environments to pin 9 (REM) and avoid pin 9 (REM ) damaged by the external noise. Page 8
9 MECHANICAL INFORMATION 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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