SG6520A Fairchild Semiconductor, SG6520A Datasheet - Page 5

• Manufacturer Part Number: SG6520A
• 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
• Manufacturer: Fairchild Semiconductor

© 2008 Fairchild Semiconductor Corporation
SG6520A • Rev. 1.0.3
Pin Definitions
Pin #
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
VS12B
Name
PSON
IS12B
VS12
VS33
GND
VDD
PGO
FPO
IS12
OTP
IS33
VS5
PGI
IS5
RI
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 is turned on/off after
a 48ms delay.
12V over-current protection sense input. For typical applications, 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 is enabled.
Reference setting. One external resistor RI connected between the RI and GND pins
determines a reference current, I
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 is enabled.
Second 12V over/under-voltage control sense input.
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.
REF
= 1.25/R
I
, for OCP programming.
www.fairchildsemi.com