AIC1686

The AIC1686 is a supervisory and protection IC intended for use in off-line, multiple output power supplies. It consists of protection circuitry, power good indicator, remote ON/OFF control, and precision shunt regulator. The overvoltage protection (OVP) function is for 3.3V, 5V, and 12V outputs. In addition, an uncommitted fault detection input (PRIN) is available for use with other protection functions, such as overcurrent, undervoltage, and/or short-circuit protection of outputs.

The shunt regulator has been included to implement the feedback control for one of the power supply's outputs. The noniverting input (EAI) of AIC1686 is internally tied to a precision 2.5V reference.

The AIC1686 power good circuit monitors the 5V output and asserts, with a programmable delay, a TTL compatible high logic level at its output after the 5V output reaches the regulation range. The delay is programmed by a timing capacitor connected to CPG pin of the IC. The power good circuit sets its output low before the 5V output goes out of regulation range. The remote ON/OFF function enables the power supply to be turned on and off from the secondary side by a switch.