3512
DESCRIPTION
The UTC 3512 is specially designed for switching power supply system. It provides over-voltage protection, over-current protection, under-voltage protection, on/off control and power good signal generating. OVP/UVP (Over/Under-Voltage Protection) monitors 3.3V, 5V and double 12V to protect our power supply and PC, FPO goes to high when one of these supply voltages exceeds their normal operation voltage range. OCP (Over Current Protection) monitors IS33, IS5, IS12 input current. The voltage difference across external current shunt is used for OCP functions. An external resistor which is connected between the RI pin and the GND pin can be used to adjust protection threshold. To achieve better immunity for lighting surge glitch and to prevent accidental power shut down during dynamic loading condition, the de-bounce time for UVP/OCP is 73us respectively. The deglitch time for OVP is 73u S for better noise immunity. .. The power supply is turned on after 38m S de-bounce time...
