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Datasheet: SG6520 (System General)

PC Power Supply Supervisors

 

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Product Specification

PC Power Supply Supervisors
SG6520

System General Corp.
- 1 -
www.sg.com.tw
Version 1.0 (IAO33.0041.B0) Sep.05,2006
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, 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
Product Specification

PC Power Supply Supervisors
SG6520

System General Corp.
- 2 -
www.sg.com.tw
Version 1.0 (IAO33.0041.B0) Sep.05,2006
MARKING INFORMATION
PIN CONFIGURATION











ORDERING INFORMATION
Part Number
Package Type
SG6520DZ
16 pin DIP Plastic (Lead Free)
SG6520SZ
16 pin SOP Plastic (Lead Free)

PIN DESCRIPTIONS
Pin No. Pin Name
Type
Description
1 PGI
Analog
input
Power Good Input. For ATX SMPS, it detects AC line voltage through the main
transformer.
2 GND
Supply Ground.
3 FPO
Logic
output
Fault Protection Output. Output signal to control the primary PWM IC through an
opto-coupler. When FPO is low, the PWM IC is enabled.
4 PSON Logic
input
Remote On/Off logic input from CPU or main-board. The power supply will be turned on/off
after 48mS delay.
5 IS12
Analog
input
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.
6 RI
Analog
input
Reference setting. One external resistor Ri connected between RI and GND pin will
determine a reference current, Iref = 1.25/Ri, for OCP programming.
7 IS12B
Analog
input
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.
8
VS12B
Analog input
Second 12V over/under-voltage control sense input.
9
OTP
Analog input
For over-temperature protection.
10
IS5
Analog input
5V over current protection sense input.
11
IS33
Analog input
3.3V over current protection sense input.
12
VS12
Analog input
12V over/under-voltage control sense input.
13
VS33
Analog input
3.3V over/under-voltage control sense input.
14
VS5
Analog input
5V over/under-voltage control sense input.
15
VDD Supply
Supply voltage. 4.2V ~ 15V. For ATX SMPS, it is connected to 5V-standby and 12V
through diodes respectively.
16 PGO
Logic
output
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.
SG6520
TP
XXXXXXXXYWWV
T
: D = DIP, S = SOP
P:
Z = Lead Free
Null=regular package
XXXXXXXX
: Wafer Lot
Y
: Year;
WW
: Week
V
: Assembly Location
Product Specification

PC Power Supply Supervisors
SG6520

System General Corp.
- 3 -
www.sg.com.tw
Version 1.0 (IAO33.0041.B0) Sep.05,2006
BLOCK DIAGRAM
Product Specification

PC Power Supply Supervisors
SG6520

System General Corp.
- 4 -
www.sg.com.tw
Version 1.0 (IAO33.0041.B0) Sep.05,2006
FUNCTION TABLE
PGI
PSON UV Protection 12V & OC Protection OV Protection FPO
PGO
PGI<1.25V L No
No
L
L
PGI<1.25V L No
Yes
H
L
PGI<1.25V L Yes
No
L
L
PGI<1.25V L Yes
Yes
H
L
PGI>1.25V L No
No
L
H
PGI>1.25V L No
Yes
H
L
PGI>1.25V L Yes
No
H
L
PGI>1.25V L Yes
Yes
H
L
X H
X
X
H
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
Product Specification

PC Power Supply Supervisors
SG6520

System General Corp.
- 5 -
www.sg.com.tw
Version 1.0 (IAO33.0041.B0) Sep.05,2006
TIMING DIAGRAM
PSON On/Off and 3.3V, 5V OVP Function
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