3515A
DESCRIPTION
The UTC 3515A is specially designed for switching power supply system. it provides protection circuits, power good output (PGO) indicator, fault protection output (FPOB) and a PSONB control.
The protection circuits include over voltage protection (OVP), under voltage protection (UVP) and over current protection (OCP) monitoring for system voltages and currents.
When 3.3V, 5V or 12V voltage is decreasing to 2.68V, 4.3V and 9.9V respectively, the under voltage protection (UVP) function will be enabled. FPOB will be set to high to turn off the PWM controller IC. Toggling the PSONB from low to high will reset the fault protection latch.
The voltage difference across external current shunt is used for OCP functions. An external resistor can be used to adjust protection threshold.
The power supply is turned on after 38m S delay time when PSONB signal is set from high to low. To turn off power supply, PSONB signal is set from low to high with the delay time 38m S. The PGI circuitry...
