WT7515 PC POWER SUPPLY SUPERVISOR. Data Sheet REV May 07, 2004

Transcription

1 ` WT7515 PC POWER SUPPLY SUPERVISOR Data Sheet REV May 07, 2004 The information in this document is subject to change without notice. All Rights Reserved F, No. 24, Industry E. 9 th RD., ScienceBased Industrial Park, HsinChu, Taiwan TEL: FAX: support@weltrend.com.tw

2 GENERAL DESCRIPTION The WT7515 provides protection circuits, power good output (), fault protection latch (), and a protection detector function () control. It can minimize external components of switching power supply systems in personal computer. The Over / Under Voltage Detector (OVD / UVD) monitors 3.3V, 5V, 12V input voltage level. The Over Current Detector (OCD) monitor IS33, IS5, IS12 input current sense. When OVD or UVD or OCD detect the fault voltage level, the is latched HIGH and go low. The latch can be reset by go HIGH. There is 2.4 ms delay time for turn off. When OVD and UVD and OCD detect the right voltage level, the power good output () will be issue. FEATURES The Over / Under Voltage Detector (OVD / UVD) monitors 3.3V, 5V, 12V input voltage level. The Over Current Detector (OCD) monitors IS33, IS5, IS12 input current sense. Both of the power good output () and fault protection latch () are Open Drain Output. 75 / 300 ms time delay for UVD. 300 ms time delay for. 38 ms for input signal De bounce. 73 us for internal signal De glitches. 2.4 ms time delay for turnoff. PIN ASSIGNMENT AND PACKAGE TYPE Pin assignment WT WT WT WT GND VCC V5 V33 GND VCC V5 V33 IS12 RI NC IS33 IS5 IS12 RI IS VCC2 IS33 ORDERING INFORMATION PACKAGE 14 Pin Plastic DIP 14 Pin Plastic SOP WT7515 N140WT WT7515 N141WT WT7515 S140WT WT7515 S141WT Lead Free Pb WT7515 N140WT Pb WT7515 S140WT Pb WT7515 N141WT Pb WT7515 S141WT Pb The TopSide Marking would been added a dot in the right side for leadfree package. Page 2

3 PIN DESCRIPTION Pin Name TYPE Description I Power good input signal pin GND P Ground O Fault protection output pin, open drain output I On/Off switch input IS12 I 12V over current protection sense input RI I Current sense adjust input VCC2 I Current sense power supply IS5 I 5V over current protection sense input IS33 I 3.3V over current protection sense input I 12V over/under voltage input pin V33 I 3.3V over/under voltage input pin V5 I 5V over/under voltage input pin VCC I Power supply O Power good output signal pin, open drain output BLOCK DIAGRAM VCC Power On Reset PWR Bandgap Reference VREF = 1.2V PWR RST VCCI V33 UN OV 38ms debounce clr clr 2.4ms delay 75ms delay Internal Power PWR OSC VCCI = 3.6V CLK V5 UN RST R OV 73us debounce S Q UN VREF OV UN RST 73us debounce clr 300ms delay IS33 VCC2 OI IREF * 8 IS5 VCC2 OI IREF * 8 VREF IREF IS12 VCC2 OI RI IREF * 8 Page 3

4 ABSOLUTE MAXIMUM RATINGS Parameter Min. Max. Unit Supply voltage, VCC, VCC2, V Input voltage, V5, V33,, V I12, I5, I V Output voltage, V Operating temperature Storage temperature *Note: Stresses above those listed may cause permanent damage to the devices RECOMMENDED OPERATING CONDITIONS Parameter Conditions Min. Typ. Max. Unit Supply voltage, VCC V Supply voltage, VCC Input voltage, V5, V33, 7 V 15 V Output voltage, 7 V Output sink current 30 ma 10 ma Supply voltage rising time 1 ms Output current for RI RI ua ELECTRICAL CHARACTERISTICS, at Ta=25 C and V CC =5V. Over Voltage Detection Parameter Condition Min. Typ. Max. Unit V V Over voltage threshold V V V I LEAKAGE Leakage current () V() = 5V 5 ua V OL Low level output voltage () I sink =10mA 0.3 V I sink =30mA 0.7 and Parameter Condition Min. Typ. Max. Unit V V Under voltage threshold V V V Input threshold voltage() V I LEAKAGE Leakage current() = 5V 5 ua V OL Low level output voltage() I sink =10mA 0.4 V Input offset voltage of OCP comparators 5 5 mv Parameter Condition Min. Typ. Max. Unit Input pullup current = 0V 150 ua Highlevel input voltage 2.0 V Lowlevel input voltage 0.8 V Page 4

5 TOTAL DEVICE Parameter Condition Min. Typ. Max. Unit Icc Supply current PDON _N= 5V 1 ma Vcc low voltage 3.6 V SWITCHING CHARACTERISTICS, Vcc=5V Parameter Condition Min. Typ. Max. Unit Debounce time () ms t dleay1 Delay time ( to ) ms Debounce time () ms t g Deglitch time us to delay time ms t delay3 Internal UVD/OCD delay time after go low & ms > 1.2V after go low & < 1.2V ms Page 5

6 APPLICATION CIRCUIT 5VSB WT V 1K 1uF 5VSB 5VSB 10K 1K GND VCC V5 R0=47 5V uF 30K, 1% IS12 RI IS5 V33 VCC2 IS33 22uF R0=47 R2, 1% 3.3V 3.3V input 5V input 22uF R1, 1% 12V 22uF R3, 1% 12V input NOTE1 The R0 can not be omitted at V5 and V33. APPLICATION NOTE When the current cross inductor raised, inductor voltage raised. And when inductor voltage exceeded resistor voltage, the OCP active. We can setup OCP point by the following equation Let VR = VL R * IR = RL * IL IR = 8 * IREF R * (8 * VREF / RI) = RL * IL R = (RL * IL) / (8 * VREF / RI) (1) Page 6

7 APPLICATION TIMMING 1.) (UNDER_VOLTAGE) t delay1 t g t delay1 t g t delay1 t g Page 7

8 2.) V33, V5, (UNDER_VOLTAGE) or IS33 IS5 IS12 (OVER_CURRENT) t delay1 t g V33/V5/ IS33/IS5/IS12 t delay3 =75mS t delay3 t g t delay1 t g V33/V5/ IS33/IS5/IS12 t delay3 =300mS t delay3 t g t delay1 t g V33/V5/ IS33/IS5/IS12 Page 8

9 3.) V33, V5, (OVER_VOLTAGE) t delay1 t g V33/V5/ t g t delay1 t g V33/V5/ Page 9

10 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 10

11 PLASTIC SMALL OUTLINE 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 012 Page 11