WT7502R数据手册Weltrend中文资料规格书

描述 Description

The WT7502R 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 / Under Voltage Detector (OVD / UVD) monitors V33, V5 and VCC input voltage level. When OVD or UVD detects the fault voltage level, the FPOB is latched HIGH and PGO goes low. When PGI detects the fault voltage level, the FPOB would be kept LOW and PGO goes low. The latch can be reset by PSONB going HIGH. There is 3.5 ms delay time for PSONB turning off FPOB.When PGI, OVD and UVD detect the right voltage level, the power good output (PGO) will be issued.

特性 Features

• The Over / Under Voltage Detector (OVD / UVD) monitors V33, V5 and VCC input voltage
• Both of the power good output (PGO) and fault protection latch (FPOB) are Open Drain Output
• 75ms / 50ms time delay for UVD
• 125ms time delay for PGO
• 19ms for PSONB input signal De–bounce
• The UVP able to block PGO
• 73us for PGI / UVD internal signal De–bounce
• 55us / 35us for OVD internal signal De–bounce
• 2.4ms / 3.5ms time delay for PSONB turn-off FPOB
• The UVD would been disabled when PGI < 1.2V