AIC1686
Off-Line Power Supply Protection IC with Shunt
Regulator
Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC www.analog.com.tw
DS-1686-00 TEL: 886-3-5772500 FAX: 886-3-5772510 1
onesansinv FEATURES
tensans Overvoltage Protection for 3.3V, 5V, and 12V
Outputs.
tensans Power Good Signal for 5V Output.
tensans Remote ON/OFF Input.
tensans Uncommitted Protection Input.
tensans 5V Regulator with 25mA Source Current.
tensans 2.5V Precision Shunt Regulator.
tensans 8V to 16V Operation.
tensans Low Power Consumption.
onesansinv APPLICATIONS
tensans PC Off-Line Power Management.
onesansinv DESCRIPTION
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) is internally tied to a precision 2.5V
reference.
The 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.