SG6521SZ

SG6521SZ Datasheet

SG6521 PC Power Supply Supervisors

Part	Datasheet
SG6521SZ	SG6521SZ (pdf)

Related Parts	Information
SG6521DZ	SG6521DZ

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SG6521 PC Power Supply Supervisors September 2008 SG6521 PC Power Supply Supervisors 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 2.8ms PSON Control to FPO Turn-off Delay 48ms PSON Control Delay No Lock-up During the Fast AC Power On/Off Wide Supply Voltage Range 4V to 15V Over-Temperature Protection OTP Additional Protection Input Pext Switch-Mode Power Supplies with Active PFC Servo System Power Supplies PC-ATX Power Supplies 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 overcurrent 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 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: SG6521 PC Power Supply Supervisors Application Diagram Figure Typical Application 2007 Fairchild Semiconductor Corporation SG6521 PC Power Supply Supervisors Block Diagram Figure Function Block Diagram SG6521 PC Power Supply Supervisors Pin Configuration Figure Pin Configuration Top View Pin Definitions Pin # 1 2 3 8 9 10 11 12 13 14 15 Name PGI GND FPO PSON IS12 IS12B VS12B Pext IS5 IS33 VS12 VS33 VS5 VDD 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 optocoupler. 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, 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 is enabled. Second 12V Over/Under-Voltage Control Sense Input. External Protection Detects Input. 5V Over-Current Protection Sense Input. 3.3V Over-Current Protection Sense Input. 12V Over/Under-Voltage Control Sense Input.

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SG6521 PC Power Supply Supervisors

September 2008

SG6521 PC Power Supply Supervisors

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 2.8ms PSON Control to FPO Turn-off Delay 48ms PSON Control Delay No Lock-up During the Fast AC Power On/Off Wide Supply Voltage Range 4V to 15V Over-Temperature Protection OTP Additional Protection Input Pext

Switch-Mode Power Supplies with Active PFC Servo System Power Supplies PC-ATX Power Supplies

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 overcurrent 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

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:

SG6521 PC Power Supply Supervisors

Application Diagram

Figure Typical Application
2007 Fairchild Semiconductor Corporation

SG6521 PC Power Supply Supervisors

Block Diagram

Figure Function Block Diagram

SG6521 PC Power Supply Supervisors

Pin Configuration

Figure Pin Configuration Top View

Pin Definitions

Pin # 1 2 3
8 9 10 11 12 13 14 15

Name PGI GND FPO

PSON

IS12

IS12B

VS12B Pext IS5 IS33 VS12 VS33 VS5 VDD

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 optocoupler. 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, 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 is enabled.

Second 12V Over/Under-Voltage Control Sense Input.

External Protection Detects Input.
5V Over-Current Protection Sense Input.
3.3V Over-Current Protection Sense Input.
12V Over/Under-Voltage Control Sense Input.

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Datasheet ID: SG6521SZ 634736