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Supervisor ICs

WT7527T

The WT7527T 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 Protection (OVP) monitors VX, V33, V5, V12A and V12B input voltage level. The Under Voltage Protection (UVP) monitors V33, V5, V12A and V12B input voltage level. The Over Current Protection (OCP) monitor I33&V33, I5&V5, I12A&V12A and I12B&V12B input current sense. The pin VX provides an extra protection function. When OVP or UVP or OCP 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 OVP and UVP and OCP detect the right voltage level, the power good output (PGO) will be issue.

Features

- The Over Voltage Protection (OVP) monitors VX, V33, V5, V12A and V12B input voltage.
- The Under Voltage Protection (UVP) monitors V33, V5, V12A and V12B input voltage.
- The Over Current Protection (OCP) monitors I33&33, I5&V5, I12A&V12A and I12B&V12B input pins.
- Two Channels for I12A&V12A and I12B&V12B OCP 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.
- 75 ms time delay for UVP / OCP / VX.
- 300 ms time delay for PGO. (*T2) (*T4) (*T7) (*T8)
- 180 ms time delay for PGO. (*T3)
- 38 ms for PSONB input signal De–bounce.
- 14 us for OVP internal signal De–bounce.
- 60 us for UVP / VX internal signal De–bounce. (*T2) (*T7) (*T8)
- 1 ms for UVP / VX internal signal De–bounce. (*T3) (*T4)
- 25 ms for OCP internal signal De–bounce. (*T2)
- 20 ms for OCP internal signal De–bounce. (*T3) (*T4)
- 80 ms for OCP internal signal De–bounce.(*T7)
- 100 ms for OCP internal signal De–bounce.(*T8)
- 73 us for PGI internal signal De–bounce.
- 4 ms for PSONB turn-off FPOB.

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