Weltrend | Products

Supervisor ICs

WT7578T

WT7578T is a switching power supply supervisor which monitors three channel of +12Voutputs. The protections include Over Voltage Protection (OVP), Under Voltage Protection (UVP),Over Current Protection (OCP), External Voltage Protection (VX), and Under Voltage Lockout(UVLO). When fault condition is detected, PGO is asserted to LOW and FPOB latched HIGH.

Features

- Three channels for 12V OVP, UVP
- Two channels for 12V OCP with auto calibration (12VA / 12VB)
- One channel for 12V OCP without auto calibration (12VC)
- External Voltage Protection (VX)
- Fault protection latch with open-drain output stage
- PGO(Power Good Output) with open-drain output stage
- 3 ms or 55μs UVP debounce. (Option)
- 14 μs OVP debounce
- 25 ms OCP debounce
- 1 ms VX debounce
- 38 ms PSONB debounce
- 73 μs PGI debounce
- 250 ms PGO delay
- Short-circuit turn-on protection
– 50 ms delay to enable UV/OC/VX detection, depends on PGI condition.

– Enable UV/OC/VX detection when PGI > 0.65V at power on mode

– Disable UV/OC/VX detection when PGI < 1.2V at normal mode
- 4ms PSONB control to FPOB turn-off delay
- VCC under voltage lockout
- Reduce the usage of VR
- Package Type: PDIP-14 and SOP-14

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