SG6521 Datasheet, PDF (1/12 Pages) Fairchild Semiconductor – PC Power Supply Supervisors

September 2008
SG6521 — PC Power Supply Supervisors
Features
ƒ Two 12V Sense Input Pins: VS12 and VS12B
ƒ Over-Voltage Protection (OVP) for 3.3V, 5V, and
two 12V
ƒ Over-Current Protection (OCP) for 3.3V, 5V, and
two 12V
ƒ Under-Voltage Protection (UVP) for 3.3V, 5V, and
two 12V
ƒ Open-Drain Output for PGO and FPO Pins
ƒ 300ms Power-Good Delay
ƒ 2.8ms PSON Control to FPO Turn-off Delay
ƒ 48ms PSON Control Delay
ƒ No Lock-up During the Fast AC Power On/Off
ƒ Wide Supply Voltage Range: 4V to 15V
ƒ Over-Temperature Protection (OTP)
ƒ Additional Protection Input (Pext)
Applications
ƒ Switch-Mode Power Supplies with Active PFC
ƒ Servo System Power Supplies
ƒ PC-ATX Power Supplies
Description
The SG6521 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
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, PGO
signal is pulled LOW.
Ordering Information
Part Operating Temperature
Number
Range
SG6521DZ
SG6521SZ
-40°C to +85°C
-40°C to +85°C
Eco
Status
RoHS
RoHS
Package
16-pin Dual In-Line Package (DIP)
16-pin Small Outline Package (SOP)
Packing
Method
Rail
Tape & Reel
For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2007 Fairchild Semiconductor Corporation
SG6521 • Rev. 1.0.0
www.fairchildsemi.com