Document
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
www.DataSheet4U.com 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
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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
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© 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
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
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X
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.