SG6520 Datasheet, PDF (1/13 Pages) Fairchild Semiconductor – PC Power Supply Supervisors

PC Power Supply Supervisors
FEATURES
„ Two 12V sense input pins: VS12 and VS12B
„ Over voltage protection (OVP) for 3.3V, 5V, and
two 12V
„ Over current protection (OCP) for 3.3V, 5V, and two
12V
„ Under voltage protection (UVP) for 3.3V, 5V, and
two 12V
„ Open drain output for PGO and FPO pins
„ 300mS power good delay
„ 300mS turn on delay for 3.3V, 5V and two 12V
„ 2.8mS PSON control to FPO turn-off delay
„ 48mS PSON control delay
„ No lockup during the fast AC power on/off
„ Wide supply voltage range from 4.2V to 15V
„ Programmable over temperature protection(OTP)
DESCRIPTION
SG6520 is designed to provide the voltage, and current
supervisor function, remote on/off (PSON) function,
Product Specification
SG6520
power good (PGO) indicator function, and fault
protection (FPO) function for switching power systems.
For supervisor function, it provides the over voltage
protection (OVP) for 3.3V, 5V and two 12V; over current
protection (OCP) for 3.3V, 5V and two 12V; under
voltage protection (UVP) for 3.3V, 5V and two 12V.
When 3.3V, 5V or 12V voltage is decreasing to 2.3V,
3.5V and 9V respectively, the under voltage protection
(UVP) function will be enabled. FPO will be set to high to
turn off the PWM controller IC. 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 48mS delay time
when PSON signal is set from high to low. To turn off
power supply, PSON signal is set from low to high with
the delay time 48mS. The PGI circuitry provides a
power-down warning signal for PGO. When PGI input is
lower than the internal 1.25V reference voltage, PGO
signal is pulled low.
TYPICAL APPLICATION
© System General Corp.
Version 1.0.1 (IAO33.0041.B0)
-1-
www.sg.com.tw • www.fairchildsemi.com
September 28, 2007