Weltrend | Products

Supervisor ICs

WT7579T

The WT7579T provides protection circuits, power good output (PGO), fault protection latch (FPOB), and a protection detector function (PSONB) control. It can minimize external components of switching power supply systems in personal computer. The Over Voltage Detector (OVD) monitors VX, V33, V5, V12A,V12B, V12Cand V12Dinput voltage level. The Under Voltage Detector (UVD) monitors V33, V5, V12A, V12B, V12C, V12Dinput voltage level. The Over Current Detector (OCD) monitor I33&V33, I5&V5, I12A&V12A,I12B&V12B, I12C&V12C, and I12D&V12Dinput current sense. The pinVX provides an extra protection function. When OVD or UVD or OCD or VX detect the fault voltage level, the FPOB is latched HIGH and PGO go low. The latch can be reset by PSONB go HIGH. There is 4 ms delay time for PSONB turn off FPOB. When OVD and UVD andOCD detect the right voltage level, the power good output (PGO) will be issue.

Features

- The Over Voltage Detector (OVD) monitors VX, V33, V5 and four channels for 12V input voltage.
- The Under Voltage Detector (UVD) monitors V33, V5 and four channels for 12V input voltage.
- The Over Current Detector (OCD) monitors I33&33, I5&V5 and four channels for I12&V12 input pins.
- Four Channels for I12V&V12 OCD with auto calibration
- The VX > 1.2V provide an extra protection.
- Both of the power good output (PGO) and fault protection latch (FPOB) are Open Drain Output.
- 180ms or 250ms time delay for PGO.(option)
- 38 ms for PSONB input signal De–bounce.
- 14 us for OVD internal signal De–bounce.
- 55 us or 3ms for UVD / VX internal signal De–bounce.(option)
- 30ms or 140ms for OCD internal signal De–bounce. (option)
- 73 us for PGI internal signal De–bounce.
- 4 ms for PSONB turn-off FPOB
- Short-circuit turn-on protection
- Package Type: PDIP-20 and SOP-20

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