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SG6520A -- PC Power Supply Supervisors
August 2008
SG6520A PC Power Supply Supervisors
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 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)
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. 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 the 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, the PGO signal is pulled LOW.
Applications
Switch-Mode Power Supplies with Active PFC Servo System Power Supplies PC-ATX Power Supplies
Ordering Information
Part Number
SG6520ADY
Operating Temperature Range
-40C to +85C
Eco Status
Green
Package
16-pin Dual In-Line Package (DIP)
Packing Method
Tube
For Fairchild's definition of "green" Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
(c) 2008 Fairchild Semiconductor Corporation SG6520A * Rev. 1.0.3
www.fairchildsemi.com
SG6520A -- PC Power Supply Supervisors
Application Diagram
Figure 1.
Typical Application
(c) 2008 Fairchild Semiconductor Corporation SG6520A * Rev. 1.0.3
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SG6520A -- PC Power Supply Supervisors
Block Diagram
Figure 2. Function Block Diagram
(c) 2008 Fairchild Semiconductor Corporation SG6520A * Rev. 1.0.3 www.fairchildsemi.com 3
SG6520A -- PC Power Supply Supervisors
Marking Information
F - Fairchild logo Z - Plant code X - 1 digit year code Y - 1 digit week code TT - 2 digits die run code T - Package type (D:DIP) P - Z:Pb free, Y:Green package M - Manufacture flow code
Figure 3. Top Mark
Pin Configuration
Figure 4. Pin Configuration (Top View)
(c) 2008 Fairchild Semiconductor Corporation SG6520A * Rev. 1.0.3
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SG6520 -- PC Power Supply Supervisors
Pin Definitions
Pin #
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Name
PGI GND FPO PSON IS12 RI IS12B VS12B OTP IS5 IS33 VS12 VS33 VS5 VDD PGO
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 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. 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.
(c) 2008 Fairchild Semiconductor Corporation SG6520A * Rev. 1.0.3
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SG6520A -- PC Power Supply Supervisors
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only.
Symbol
VDD VIN VOUT TJ TSTG TL ESD DC Supply Voltage Input Voltage Output Voltage
(1, 2)
Parameter
PSON, PGI, VS5, IS5, VS33, IS33, OTP VS12, VS12B, IS12, IS12B FPO, PGO
Min.
-0.3 -0.3 -0.3 -40 -55
Max.
16 7.0 15.0 7.0 +125 +150 +260 3.0 200
Unit
V V V V C C C KV V
Operating Junction Temperature Storage Temperature Range Lead Temperature (Soldering) Electrostatic Discharge Capability, Human Body Model, JESD22-A114 Electrostatic Discharge Capability, Machine Model, JESD22-A115
Notes: 1. All voltage values, except differential voltage, are given with respect to GND pin. 2. Stresses beyond those listed under "absolute maximum ratings "may cause permanent damage to the device.
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol
TA
Parameter
Operating Ambient Temperature
Min.
-40
Typ.
Max.
+85
Unit
C
(c) 2008 Fairchild Semiconductor Corporation SG6520A * Rev. 1.0.3
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SG6520A -- PC Power Supply Supervisors
Electrical Characteristics
VDD = 5V, TA = 25C, unless otherwise noted.
Symbol
Parameter
Conditions
Min.
4.2
Typ.
Max.
15.0 2.6 1.5 4.2
Units
V mA mA ms V
VDD Section VDD DC Supply Voltage IDD1 Supply Current PSON = LOW IDD2 Supply Current PSON = HIGH tR Supply Voltage Rising Time VST VDD Start Threshold Voltage Over-Voltage (OVP) and Over-Current (OCP) Protections VS33 VOVP Over-Voltage Protection VS5 VS12, VS12B Ratio of Current-Sense Sink Current RI = 18.5k ~ 75k IREF to Current-Sense Setting Pin (RI) (temperature = Source Current -40C ~ +80C) VOFFSET OCP Comparator Input Offset Voltage ILKG-FPO Leakage Current (FPO) FPO = 5V VOL-FPO Low-Level Output Voltage (FPO) ISINK 20mA tOVP OVP Delay Time tOCP OCP Delay Time VRI RI Pin Voltage IRI Output Current RI 0.6V < PGI < 1.25V; tST-OCP Start-up OCP / UVP Protection Time FPO = Low Under-Voltage Protection and PGI, PGO VPGI_1 Input Threshold Voltage PGI 1 VPGI_2 Input Threshold Voltage PGI 2 VS33 VUVP Under-Voltage Protection VS5 VS12, VS12B tOND Under-Voltage Turn-on Delay PGI>0.6V tUVP UVP Delay PGI>1.25V ILKG-PGO Leakage Current (PGO) PGO = 5V VDD = 12V; ISINK VOL-PGO Low-Level Output Voltage (PGO) 10mA tPG Timing PG Delay tND1 Noise Deglitch Time PSON = 0V PSON Control IPSON Input Pull-up Current VIH High-Level Input Voltage VIL Low-Level Input Voltage tPSON Timing PSON to On/Off
1.7 1.0 1
3.830 5.80 13.70 7.80 -3
3.965 6.15 14.05 8.05
4.100 6.50 14.40 8.30 3 5 0.4 110 27.5 1.01*Typ. 62.5 114 1.02*Typ. 1.03*Typ. 2.95 4.5 10.8 114 4.0 5 0.4
V
33 12.5 0.98*Typ. 12.5 49 0.98*Typ. 0.96*Typ. 2.65 3.7 9.2 49 2.4
75 20.0 1.25 75 1.25 0.60 2.80 4.1 10.0 75 3.2
mV A V s ms V A ms V V V ms ms A V ms s A V V ms
200 90
300 150 120
450 210
2 0.8 PSON LOW to FPO LOW PSON HIGH to PGO LOW 34 34 1.6 2.4 0.18 48 48 2.8 2.5 67 67 4.5 2.6 0.23
tPSOFF Timing PGO LOW to FPO HIGH Over-Temperature Section VTH Over-Temperature Threshold VHYST Hysteresis
ms V V
(c) 2008 Fairchild Semiconductor Corporation SG6520A * Rev. 1.0.3
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SG6520A -- PC Power Supply Supervisors
Functional Description
The SG6520A provides over-current protection for the 3.3V, 5V, and two 12V rails. Whenever an OCP condition occurs at any of the voltage rails, PGO is LOW and FPO is open. The internal OCP comparators have a very small offset voltage ( 3mV). The sink currents of IS33, IS5, and IS12 are eight times the current at the RI pin. The current at the RI pin is VRI/RI. Here is an example demonstrating how to set the over current protection. If I1xR1 > IRIxR2, OCP is active. If R1=5m, RI=30K, and the OCP active level is 35A, the R2 resistor is:
R2 = I1 x R 1 = 525 IRI x 8
(1) Figure 5. OCP Set Up
where C is bypass noise; suggested value is between 1F ~ 2.2F.
(c) 2008 Fairchild Semiconductor Corporation SG6520A * Rev. 1.0.3
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SG6520A -- PC Power Supply Supervisors
Timing Chart
Figure 6. Timing Diagram
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SG6520A -- PC Power Supply Supervisors
Typical Performance Characteristics
1.251 1.250
2.10 2.00 1.90 IDD1 (mA)
VPGI(V)
1.249 1.248 1.247
1.80 1.70 1.60 1.50
1.246 -40 -25 -10 5 20 35 50 65 80 95 110 125 Temperature ()
1.40 -40 -25 -10 5 20 35 50 65 Temperature () 80 95 110 125
Figure 7. VPGI vs. TA
Figure 8. IDD1 vs. TA
6.00 4.00 VOFFSET (mV) 2.00
35.0 30.0 25.0
TOCP (ms)
20.0 15.0 10.0 5.0 0.0
0.00 -2.00 -4.00 -6.00 -40 -25 -10 5 20 35 50 65 Temperature () 80 95 110 125
-40
-25
-10
5
20
35
50
65
80
95
110
125
Temperature ()
Figure 9. VOFFSET vs. TA
Figure 10. TOCP vs. TA
1.30
1.28
VRI (V)
1.26
1.24
1.22
1.20 -40 -25 -10 5 20 35 50 65 80 95 110 125
Temperature ()
Figure 11. VRI vs. TA
(c) 2008 Fairchild Semiconductor Corporation SG6520A * Rev. 1.0.3
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SG6520A -- PC Power Supply Supervisors
Physical Dimensions
16
19.68 18.66
A
9
6.60 6.09
1
8
(0.40)
TOP VIEW
0.38 MIN 5.33 MAX 3.42 3.17 3.81 2.92 2.54 0.58 A 0.35 1.78 1.14 17.78
SIDE VIEW NOTES: UNLESS OTHERWISE SPECIFIED A THIS PACKAGE CONFORMS TO JEDEC MS-001 VARIATION BB B) ALL DIMENSIONS ARE IN MILLIMETERS. C) DIMENSIONS ARE EXCLUSIVE OF BURRS, MOLD FLASH, AND TIE BAR PROTRUSIONS D) CONFORMS TO ASME Y14.5M-1994 E) DRAWING FILE NAME: N16EREV1
Figure 12. 16-pin, Dual In-Line Package (DIP)
8.13 7.62
0.35 0.20 8.69
15 0
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild's worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor's online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/.
(c) 2008 Fairchild Semiconductor Corporation SG6520A * Rev. 1.0.3
www.fairchildsemi.com 11
SG6520A -- PC Power Supply Supervisors
(c) 2008 Fairchild Semiconductor Corporation SG6520A * Rev. 1.0.3
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