SG6105A — Power Supply Supervisor+Regulator+PWM
July 2009
SG6105A Power Supply Supervisor + Regulator + PWM
Features
PC Half-Bridge (or 494) Power Supply Supervisor + two 431 + PWM High Integration with Few External Components Over-Voltage Protection for 3.3V, 5V, and 12V Under-Voltage Protection for 3.3V, 5V, and 12V Under-Voltage Protection for -12V and/or -5V Over-Power and Short-Circuit Protection Power-Down Warning Circuitry Power-Good Circuitry Delay Time for PSON and PG Signal Remote ON/OFF Function On-Chip Oscillator and Error Amplifier Two Shunt Regulators for 3.3V and 5V-Standby Latching PWM for Cycle-by-Cycle Switching Push-Pull PWM Operation and Totem Pole Outputs Soft-Start and Maximum 93% Duty Cycle
Description
SG6105A controller is designed for switching-mode power supplies for desktop PCs. It provides all the functions necessary to monitor and control the output of the power supply. Remote ON/OFF control, power-good circuitry, and protection features against over-voltage and over-power are implemented. It directly senses all the output rails for OVP without the need for external dividers. An innovative AC-signal sampling circuitry provides a sufficient power-down warning signal for PG. A built-in timer generates accurate timing for the control circuit, including the PS-off delay. The cycle-by-cycle PWM switching prevents the power transformer from saturation and ensures the fastest response for the short-circuit protection, which greatly reduces stress for power transistors. Two internal precision TL431 shunt regulators provide stable reference voltage and a driver for 3.3V and 5V standby regulation. Utilizing minimum external components, the SG6105A includes the functions for push-pull and/or half-bridge topology, decreasing production cost and PCB space, and increasing the MTBF for power supply.
Applications
Switching mode power supply for computers: AT NLX SFX (micro-ATX)
Ordering Information
Part Number
SG6105ADZ SG6105ADY
Operating Temperature Range
-40 to +105°C -40 to +105°C
Eco Status
RoHS Green
Package
20-pin Dual In-Line Package (DIP) 20-pin Dual In-Line Package (DIP)
Packing Method
Tube Tube
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2
www.fairchildsemi.com
SG6105A — Power Supply Supervisor+Regulator+PWM
Application Diagram
Figure 1. Typical Application
SG6105A
© 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2
www.fairchildsemi.com 2
SG6105A — Power Supply Supervisor+Regulator+PWM
Block Diagram
V33
V5
V12
UVAC
RI
PG
GND
VCC
2
3
7
5
2 μA
19
VREF
10
15
20
0.7V
DSD
UV Detector OV Protector UV Protector
Delay 300ms
Delay 3ms
OP1
D
SET
Q
9
OP2
CLR
Q
S
SET
Q
8
FB1
3.2V
VCC 5V
D
SET
R
CLR
Q
Q
NVP
64μA Buffer
O.S.C
CLR
14 13
VREF1 FB2
2.1V
6 4
OPP
Delay 7ms
Q
2.5V
8μ A
2.4V
Buffer
Delay 7ms
Delay 15ms
11 12
VCC
PSON
1.4V
1
On/Off Delay 50ms 16ms
Delay 2ms
VREF2
18
SS
17
IN
16
COMP
Figure 2. Function Block Diagram
© 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2
www.fairchildsemi.com 3
SG6105A — Power Supply Supervisor+Regulator+PWM
Marking Information
20
T : D = DIP P : Z = Lead Free Null=Regular Ppackage XXXXXXXX: Wafer Lot Y: Year; WW: Week V: Assembly Location
SG6105ATP
XXXXXXXXYWWV
1
※Marking for SG6105ADZ (Pb-free)
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: Y:Green Package M: Manufacture Flow Code
※Marking for SG6105ADY(Green compound) Figure 3. Top Mark
Pin Configuration
Figure 4. Pin Configuration (Top View)
© 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2
www.fairchildsemi.com 4
SG6105A — Power Supply Supervisor+Regulator+PWM
Pin Definitions
Pin #
1 2 3 4 5 6 7 9/8 10 11 12 13 14 15 16 17 18 19 20
Name
PSON V33 V5 OPP UVAC NVP V12 OP1/OP2 PG FB2 VREF2 VREF1 FB1 GND COMP IN SS RI VCC
Description
Remote on/off logic input for CPU or controller. Turn on/off the PWM output after the 7.5ms / 26ms delay. PSON=0, the main SMPS is operational. PSON =1, the main SMPS is off and the latch is reset. 3.3V over-voltage/under-voltage control sense input. 5V over-voltage/under-voltage control sense input. Over-power sense input. This pin is connected to driver transformer or the output of current transformer. When not in use, this pin should be grounded. AC fail detection. Detect main AC voltage under-voltage and/or failure. The protection input for negative output, such as –12V and/or –5V. Trip voltage=2.1V. 12V over-voltage/under-voltage control sense input. The totem-pole output drivers of push-pull PWM. The outputs are enabled (LOW) only when the NAND gate inputs are HIGH. The maximum duty cycle on an output (OP1 or OP2) is 46%. Power-good logic output, 0 or 1 (open-collector). PG=1, the power is good for operation. The PG delay is 300ms. Output for second converter regulation loop. Reference comparison input for second converter regulation loop, 2.5V. Reference comparison input for first converter regulation loop, 2.5V. Output for first converter regulation loop. Ground. Error amplifier output and the input of the PWM comparator. The negative input of error amplifier. The positive input of error amplifier is a 2.5V reference voltage. Soft-start, settable through an external capacitor. The current source output at this pin is 8µA and the voltage is clamped at 2.5V. Connected to external resistor for the reference setting. RI=75kΩ. Supply voltage. 4.5V ~ 5.5V connected to 5V-standby.
© 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2
www.fairchildsemi.com 5
SG6105A — Power Supply Supervisor+Regulator+PWM
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
VCC IOUT VPIN
Parameter
DC Supply Voltage at Pin 20 Output Current at PG, Fb1, Fb2 Pins V12, OP1, OP2, FB1, FB2, SS PSON, V33, V5, VREF1, VREF2, OPP, UVAC, RI, NVP, IN, COMP, PG Power Dissipation Storage Temperature Range Thermal Resistance, Junction-To-Air Operating Junction Temperature Operating Ambient Temperature Lead Temperature (Soldering, 10 Seconds) Human Body Model, JESD22-A114 (TA=25°C) (TA=90°C)
Min.
Max.
16 30
Unit
V mA V V W °C °C/W °C °C °C KV
-0.3 -0.3
16.0 7.0 1.5 0.5
PD TSTG θJA TJ TA TL ESD
-55
+150 82.5 +150
-30
+125 +260 3
Notes: 1. All voltage values, except differential voltages, 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 Range
Min.
-40
Max.
+105
Unit
°C
© 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2
www.fairchildsemi.com 6
SG6105A — Power Supply Supervisor+Regulator+PWM
Electrical Characteristics
VCC=5V, TA= 25°C, RI=75KΩ, unless noted operating specs.
Symbol
ICC VOVP
Parameter
Total Supply Current 3.3V Over-Voltage Protection 5.0V 12.0V 3.3V
Conditions
PG High
Min.
3.9 5.8 13.9 2.0 3.0 6.0 2.5 4.0 9.4
Typ.
5 4.1 6.1 14.5 2.6 3.6 7.2 2.8 4.3 10.1 2.32 3.2 0.3 2.1 67 0.70 2.40 1.20 7 7.0
Max.
10 4.3 6.5 14.9 2.8 3.9 8.0 3.0 4.5 10.4 2.39 3.4 0.4 2.2 71 1.35 3.75 1.88 9 10.2
Units
mA V
VUVP
Under-Voltage Protection
5.0V 12.0V 3.3V 5.0V 12.0V
V
VUVS
Under-Voltage Sense for PG Low Over-Power Protection (3) (With TOPP Delay Time) Over-Power Protection (Without Delay Time)
V
VOPP VOPPH VX VNVP INVP TOVP TUVP TUVS TOPP TNVP
VUVAC=1.5V
2.25 3.0 0.2 2.0 63 0.37 0.80 0.37 5 3.3
V V V V µA ms ms ms ms Ms
Disable Under-Voltage / Over-Power Protection Threshold Negative Voltage Protection: Voltage Level Negative Voltage Protection: Source Current Timing for Over-Voltage Protection Timing for Under-Voltage Protection Timing for Under-Voltage Sense for PG Low Timing for Over-Power Protection Timing for Negative Voltage Protection
Shunt Regulator Section Current
VREF VDEV, I VDEV, T REGLI-FB IOUT-FB** Reference Voltage Deviation of VREF Over FB Current Line Regulation
(4) (4) (4) (4)
IFB=0.5mA, TA=25°C IFB=0.5mA to 10mA
2.475
2.500 10
2.525 20 30
V mV mV mV/V mA
Deviation of VREF Over Temperature Output Sinking Current Capability
4 ≦ VFB ≦ 15V VFB=2V 10
1
Notes: 3. VOPPS=(2/3) x VOPP + (1/3) x VUVAC. 4. Not tested in production. Continued on following page…
© 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2
www.fairchildsemi.com 7
SG6105A — Power Supply Supervisor+Regulator+PWM
Electrical Characteristics (Continued)
VCC=5V, TA= 25°C, RI=75KΩ, unless noted operating specs.
Symbol
TPG VUVAC TR TF VOL2 ION2
Parameter
Timing for PG Delay UVAC Voltage Sense for PG Power-Good Output Rising (5) Time Power-Good Falling Time Power-Good Output Saturation Level Power-Good Leakage Current Collector
(5)
Conditions
RI=75kΩ
Min.
200 0.68
Typ.
300 0.70 1 300
Max.
400 0.72 3 500 0.5 1
Units
ms V µs ns V µA
Power-Good Section
CL=100pF, Pull 2.2K to 5V CL=100pF, Pull 2.2K to 5V IPG=5mA VPG=5V
Remote On/Off Section
VIH VIL VHYSTERESIS IPSON TPSON(ON) TPSON(OFF) TPSOFF High-Level Input Voltage Low-Level Input Voltage PSON Input Hysteresis Voltage Remote Input Driving Current Timing PSON to On RI=75kΩ 38 8 1.5 50 16 2.0 Timing PSON to Off (PS-off) RI=75kΩ Timing PG Low to Power Off RI=75kΩ 0.3 0.5 62 24 6.3 2 0.8 V V V mA ms ms ms
Error Amplifier Section
V2.5 IIB AVOL BW PSRR Reference Voltage Input Bias Current
(5) (5)
TA=25°C
2.46 50 0.3 50
2.50 60 1.0
2.54 0.1
V µA dB MHz dB
Open-Loop Voltage Gain Unity Gain Bandwidth
(5)
Power Supply Rejection (5) Ratio
Oscillator Section
fOSC PWM Frequency RI=75kΩ 62 65 68 KHz
Soft-Start Section
ISS Charge Current 7 8 9 µA
Comparator Section
DC Duty Cycle 85 93 %
PWM Output Section
VOL VOH RO Output Voltage Low Output Voltage High Output Impedance of VOH IO=20mA V12=12V 4 1.5 3.3 0.8 V V KΩ
Note: 5. Not tested in production.
© 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2
www.fairchildsemi.com 8
SG6105A — Power Supply Supervisor+Regulator+PWM
Typical Performance Characteristics
5. 7
2 .6 0 0
5. 5
2 .5 5 0
ICC-OP(mA)
5. 3
VREF (V)
-40 -25 -10 5 20 35 50 65 80 95 110 125
2 .5 0 0
5. 1
2 .4 5 0
4. 9
2 .4 0 0 -40 -2 5 -10 5 20 35 50 65 80 95 1 10 1 25
Temperature (°C)
Temperature (°C)
Figure 5. Operating Supply Current vs. Temperature
Figure 6. Reference Voltage vs. Temperature
6.000
67.000
66.000
fOSC (KHz)
5.000
VOH (V)
65.000
4.000
64.000
3.000 -40 -25 -10 5 20 35 50 65 80 95 110 125
6 3.000 -40 -25 -10 5 20 35 50 65 80 95 110 125
Temperature (°C)
Temperature (°C)
Figure 7. PWM Output Voltage vs. Temperature
Figure 8. Frequency vs. Temperature
89.500 89.450 89.400
2.600
DCMAX (%)
89.350 89.300 89.250 89.200 89.150 89.100 -40 -25 -10 5 20 35 50 65 80 95 110 125
2.550
V2.5 (V)
2.500
2.450 -40 -25
-10
5
20
35
50
65
80
95
110 125
Temperature (°C)
Temperature (°C)
Figure 9.
MAX Duty Cycle vs. Temperature
Figure 10.
Reference Voltage vs. Temperature
© 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2
www.fairchildsemi.com 9
SG6105A — Power Supply Supervisor+Regulator+PWM
Typical Performance Characteristics (Continued)
4.180
2.610 2.600 2.590
4.160
VUVP (V)
2.580 2.570 2.560 2.550 2.540 -40 -25 -10
VOVP (V)
5 20 35 50 65 80 95 110 125
4.140
4.120
4.100 -40 -25 -10 5 20 35 50 65 80 95 110 125
Temperature (°C)
Temperature (°C)
Figure 11. 3.3V VUVP vs. Temperature
Figure 12. 3.3V VOVP vs. Temperature
3.700
6.180
3.600
6.160
VOVP (V)
5 20 35 50 65 80 95 110 125
VUVP (V)
3.500
6.140
3.400
6.120
3.300 -40 -25 -10
Temperature (°C)
6.100 -40 -25 -10
5
20
35
50
65
80
95
110 125
Temperature (°C)
Figure 13. 5V VUVP vs. Temperature
Figure 14. 5V VOVP vs. Temperature
7.060
14.600
7.050
VUVP (V)
14.550
VOVP (V)
-40 -25 -10 5 20 35 50 65 80 95 110 125
7.040
14.500
7.030
Temperature (°C)
14.450 -40 -25 -10
5
20
35
50
65
80
95 110 125
Temperature (°C)
Figure 15. 12V VUVP vs. Temperature
Figure 16.
12V VOVP vs. Temperature
© 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2
www.fairchildsemi.com 10
SG6105A — Power Supply Supervisor+Regulator+PWM
Functional Description
Protection against over-voltage, short-circuit, and fault conditions is mandatory in PC power supplies. These protection circuits can be realized by using many discrete components and comparators, which occupy a lot of PCB space and add to assembling costs. This single chip controller IC provides complete protection circuits, shunt regulators, and PWM control function with fewer components. SG6105A is an ideal controller IC for PC switching mode power supplies. The features and benefits of this device are: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. Over-voltage and under-voltage protection for 3.3V, 5V, and 12V without external divider. Over-power protection. UV protection for -12V and/or -5V. Power-down warning for power-good signal. Power-good signal and power-fail lockup. Remote on/off control. Delay time for PSON and PS-off signal. Two shunt regulators for 3.3V and 5V-standby regulation. Complete pulse width modulation (PWM) control circuitry. On-chip oscillator. Programmable soft-start. Maximum 93% duty cycle. Few external components. More reliable system. Little space on PCB. Easy trouble-shooting and implementation. 6. 4. 5. 3.
Feature Descriptions
1. Over-voltage protection can be implemented without any additional components. Overvoltage sense levels for 3.3V, 5V, 12V, are 4.1V, 6.1V, 14.5V, respectively. Over-current and/or short-circuit protection can also be achieved using over-power protection, in which the OPP pin is connected to the current transformer (driver transformer). The power-good signal is asserted to indicate the 3.3V, 5V, and 12V is above the undervoltage threshold level. PG pin goes high when the above condition is reached. A 2K pull-up resistor may connect to 5V. The VCC can be supplied from the 5V-standby. When the VCC voltage is higher than 7V, besides the shunt regulator, the circuit is shutdown and reset. No extra power supply is needed. Two internal high-precision 431 regulators are built-in to provide reference voltages. shunt stable
2.
7.
Complete PWM control circuitry, including the error amplifier for push-pull or half-bridge operation.
Supervisory Circuit Operation
The PC generates the remote ON/OFF logic (PSON), which is LOW for power supply on and HIGH to switch off the power supply. The remote ON/OFF is connected to PSON input.
© 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2
www.fairchildsemi.com 11
SG6105A — Power Supply Supervisor+Regulator+PWM
Application Information
Introduction
The application guide shows the key features of SG6105A and illustrates how to design in an ATX switching mode power supply (SMPS). SG6105A is suitable for half-bridge, push-pull topology and incorporates with a four-channel supervisor, including 5V-standby. The PWM section of SG6105A comprises a built-in 65kHz oscillator and high-immunity circuits, which protect the system from noise interference and provide more noise margins for improper PCB layout. SG6105A has OVP and UVP for 12V, 5V, and 3.3V. NVP is used for negative voltage protection, such as – 12V and/or –5V. The UVAC (AC fails detection) is applied to detect AC line condition. Two built-in internal precision TL431 shunt regulators can be used for 3.3V or 5V auxiliary standby power. VDD
OP1
OP2 R1 R2 C1 R3 OPP
AC Fails Detection
Through a resistor divider, UVAC is connected to the secondary power transformer for detecting the AC line condition. Once the voltage of UVAC is lower than 0.7V for a period of time, such as 200µs, the PG (powergood) signal is pulled low to indicate an AC line powerdown condition. The voltage amplitude of the PWM switching signal in the secondary power transformer is proportional to the AC line voltage. Adjust the ratio of resistor divider to decide the threshold of power-down warning. A small capacitor is connected from UVAC to ground for filtering the switching noise.
VS VO
Figure 18. OPP Protection Circuit
Negative Voltage Protection (NVP)
The NVP provides an under-voltage protection (UVP) for negative voltage outputs. An under-voltage represents the phenomenal of the overload condition in negative voltage output. For example, the –12V output may drop to –10V during the overload situation. A resistor determining the threshold of the protection is connected from pin NVP to the negative voltage output. Via this resistor, NVP outputs a 64µA constant current to the negative voltage output. When the NVP voltage is over 2.1V and the situation kept for longer than 7ms, SG6105A locks the power outputs off: VNVP=64µA × (R1 + R2) – V-12V (1) The power outputs are locked off when VNVP ≥ 2.1V.
R1
0.7V
UVAC
R2
C1
Figure 19. NVP Protection Circuit Figure 17. AC Detection Circuit
Over-Power Protection (OPP)
The OPP is used for detecting over-power and/or shortcircuit conditions. When OPPS voltage (p.4, Note-1) is higher than 2.1V and this situation exists for longer than 7ms, SG6105A pulls the PG low and locks off the power outputs.
© 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2
www.fairchildsemi.com 12
SG6105A — Power Supply Supervisor+Regulator+PWM
Timing Diagram
VCC
PSON
3.3V,5V,12V tPSON(ON) NVP tPSON(OFF) tUVP tNVP
SS(on/off)
tPSOFF
PG
tPG
VCC PSON Voltage < VUVAC UVAC OPP tOPP SS(on/off) PG
Figure 20. Timing Diagram
© 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2
www.fairchildsemi.com 13
SG6105A — Power Supply Supervisor+Regulator+PWM
Reference Circuit
Figure 21. Reference Circuit
SG6105A
© 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2
www.fairchildsemi.com 14
SG6105A — Power Supply Supervisor+Regulator+PWM
BOM
Reference
D1,D2,D6 D3 D4,D5 D7,D8,D9,D10,D11 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13
Component
PR1004 2A45V 30C40 1N4148 62KΩ 1/8W 3.2KΩ 1/8W 510Ω 1% 1.5KΩ 1% 100Ω 1/8W 100Ω 1/8W 1KΩ 1/8W 47~100Ω 1KΩ 95.3KΩ 93.7KΩ 75 KΩ 14.2KΩ
Reference
R14 R15 R16 R17 R18 R19 R20 R21 R22 C1 C2,C5 C3,C6 C4 Q1 Q2,Q3 U1 U2
Component
100KΩ 1% 47KΩ 1/8W 9.47KΩ 1/8W 1.5KΩ 1% 1.45KΩ 1% 39Ω 1/8W 1KΩ 1/8W 96.7KΩ 1/8W 10KΩ 1/8W 101/50V 2.2µF/50V 103/50V 333/50V A928 2SC945 PC817 SG6105A
© 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2
www.fairchildsemi.com 15
SG6105A — Power Supply Supervisor+Regulator+PWM
Physical Dimensions
24.892-26.924
PIN #1
6.223-6.477
1.524 3.175-3.429
7.620
2.921-3.810
5.334 MAX 2.540 0.381 MIN
0-15 9.017 TYP
0.457
NOTES:
A. CONFORMS TO JEDEC REGISTRATION MS-001, VARIATIONS AD B. ALL DIMENSIONS ARE IN MILLIMETERS C. DOES NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.25MM. D. DOES NOT INCLUDE DAMBAR PROTRUSIONS. DAMBAR PROTRUSIONS SHALL NOT EXCEED 0.25MM. E. DRAWING FILE NAME: N20SREV1
Figure 22. 20-Lead Dual Inline Package (DIP)
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/.
© 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2
www.fairchildsemi.com 16
SG6105A — Power Supply Supervisor+Regulator+PWM
© 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2
www.fairchildsemi.com 17