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SG6520A — PC Power Supply Supervisors
August 2008
SG6520A
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
2.8ms PSON Control to FPO Turn-off Delay
48ms PSON Control Delay
No Lock-up During the Fast AC Power On/Off
Wide Supply Voltage Range: 4V to 15V
Over-Temperature Protection (OTP)
Description
The SG6520A is designed to provide the supply
voltage, current supervisor, remote on/off (PSON),
power good (PGO) indicator, and fault protection (FPO)
functions for switching power systems.
For supervisory functions, 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 decreases to 2.3V,
3.5V, and 9V, respectively, the under-voltage protection
function is enabled. FPO is set HIGH to turn off the
PWM controller IC. The voltage difference across the
external current shunt is used for OCP functions. An
external resistor can be used to adjust protection
threshold. An additional protection input pin provides
the flexibility for designing protection circuits.
The power supply is turned on after a 48ms delay when
PSON signal is set from HIGH to LOW. To turn off the
power supply, the PSON signal is set from LOW to
HIGH with a delay of 48ms. The PGI circuitry provides a
power-down warning signal for PGO. When PGI input is
lower than the internal 1.25V reference voltage, the
PGO signal is pulled LOW.
Applications
Switch-Mode Power Supplies with Active PFC
Servo System Power Supplies
PC-ATX Power Supplies
Ordering Information
Part Number
SG6520ADY
Operating
Temperature Range
-40°C to +85°C
Eco Status
Green
Package
16-pin Dual In-Line Package (DIP)
Packing
Method
Tube
For Fairchild’s definition of “green” Eco Status, please visit:
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