Product Specification
PC Power Supply Supervisors
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.
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,
TYPICAL APPLICATION
© System General Corp.
Version 1.0.1 (IAO33.0041.B0)
-1-
www.sg.com.tw • www.fairchildsemi.com
September 28, 2007
Product Specification
PC Power Supply Supervisors
SG6520
PIN CONFIGURATION
T:
D = DIP, S = SOP
P:
Z = Lead Free
Null=regular package
MARKING INFORMATION
SG6520TP
XXXXXXXXYWWV
XXXXXXXX:
Wafer Lot
Y:
Year;
WW:
Week
V:
Assembly Location
ORDERING INFORMATION
Part Number
SG6520DZ
SG6520SZ (Preliminary)
Pb-Free Package Type
16 pin DIP Plastic
16 pin SOP Plastic
PIN DESCRIPTIONS
Pin No. Pin Name
1
2
3
4
PGI
GND
FPO
PSON
Type
Analog input
Supply
Logic output
Logic input
Description
Power Good Input. For ATX SMPS, it detects AC line voltage through the main
transformer.
Ground.
Fault Protection Output. Output signal to control the primary PWM IC through an
opto-coupler. When FPO is low, the PWM IC is enabled.
Remote On/Off logic input from CPU or main-board. The power supply will be turned on/off
after 48mS delay.
12V over current protection sense input. For typical application, this pin is connected to the
positive end of a current shunt through one resistor. When the voltage on IS12 is higher
than that of VS12 by 5mV, OCP will be enabled.
Reference setting. One external resistor Ri connected between RI and GND pin will
determine a reference current, Iref = 1.25/Ri, for OCP programming.
12V over current protection sense input. For typical application, this pin is connected to the
positive end of a current shunt through one resistor. When the voltage on IS12 is higher
than that of VS12 by 5mV, OCP will be enabled.
Second 12V over/under-voltage control sense input.
For over-temperature protection.
5V over current protection sense input.
3.3V over current protection sense input.
12V over/under-voltage control sense input.
3.3V over/under-voltage control sense input.
5V over/under-voltage control sense input.
Supply voltage. 4.2V ~ 15V. For ATX SMPS, it is connected to 5V-standby and 12V
through diodes respectively.
Power good logic output, 0 or 1(open-drain). Power good=1 means that the power supply is
good for operation. The power good delay is 300mS.
5
IS12
Analog input
6
RI
Analog input
7
8
9
10
11
12
13
14
15
16
IS12B
VS12B
OTP
IS5
IS33
VS12
VS33
VS5
VDD
PGO
Analog input
Analog input
Analog input
Analog input
Analog input
Analog input
Analog input
Analog input
Supply
Logic output
© System General Corp.
Version 1.0.1 (IAO33.0041.B0)
-2-
www.sg.com.tw • www.fairchildsemi.com
September 28, 2007
Product Specification
PC Power Supply Supervisors
SG6520
BLOCK DIAGRAM
© System General Corp.
Version 1.0.1 (IAO33.0041.B0)
-3-
www.sg.com.tw • www.fairchildsemi.com
September 28, 2007
Product Specification
PC Power Supply Supervisors
SG6520
FUNCTION TABLE
PGI
PGI<1.25V
PGI<1.25V
PGI<1.25V
PGI<1.25V
PGI>1.25V
PGI>1.25V
PGI>1.25V
PGI>1.25V
X
PSON
L
L
L
L
L
L
L
L
H
UV Protection 12V & OC Protection OV Protection FPO
No
No
Yes
Yes
No
No
Yes
Yes
X
No
Yes
No
Yes
No
Yes
No
Yes
X
L
H
L
H
L
H
H
H
H
PGO
L
L
L
L
H
L
L
L
L
x = don’t care
FPO = L means: fault IS NOT latched
FPO = H means: fault IS latched
PGO = L means: fault
PGO = H means: No fault
© System General Corp.
Version 1.0.1 (IAO33.0041.B0)
-4-
www.sg.com.tw • www.fairchildsemi.com
September 28, 2007
Product Specification
PC Power Supply Supervisors
SG6520
TIMING DIAGRAM
PSON On/Off and 3.3V, 5V OVP Function
© System General Corp.
Version 1.0.1 (IAO33.0041.B0)
-5-
www.sg.com.tw • www.fairchildsemi.com
September 28, 2007
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