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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105A 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.
FEATURES
PC half-bridge (or 494) power supply supervisor + two 431 + PWM High integration & 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
APPLICATIONS
Switching mode power supply for computers: AT NLX SFX (micro-ATX)
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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105A
TYPICAL APPLICATION 1
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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105A
TYPICAL APPLICATION 2
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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105A PIN CONFIGURATION
MARKING DIAGRAMS 20
PSON
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
VCC RI SS IN COMP GND FB 1 VREF1 VREF2 FB 2
XXXXXXXXYWWV
SG6105ATP
V33 V5 OPP
1
T : D = DIP P : Z = Lead Free Null=regular package XXXXXXXX: Wafer Lot Y: Year; WW: Week V: Assembly Location
UVAC NVP V12 OP2 OP1 PG
ORDERING INFORMATION
Part Number
SG6105ADZ
Pb-Free
Package
20-Pin DIP
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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105A
PIN DESCRIPTIONS
Name Pin Type Function
Remote on/off logic input for CPU or controller. Turn on/off the PWM output after the 7.5ms PSON 1 Logic Input / 26ms delay. PSON = 0, the main SMPS is operational. PSON =1, the main SMPS is off and the latch is reset. V33 V5 OPP UVAC NVP V12 OP1/OP2 2 3 4 5 6 7 9/8 Analog Input Analog Input Analog Input Analog Input Analog Input Analog Input Analog Output 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 Output are enabled (low) only when the NAND gate inputs are high. The maximum duty cycle on an Output (OP1 or OP2) is 46%. PG FB2 VREF2 VREF1 FB1 GND COMP IN SS RI VCC 10 11 12 13 14 15 16 17 18 19 20 Logic Output Analog Output Analog Input Analog Input Analog Output Supply Analog Output Analog Input Analog Input Program Analog Input Supply 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. The soft-start, settable through an external capacitor. The current source output at this pin is 8A and the voltage is clamped at 2.5V. Connected to external resistor for the reference setting. RI = 75k. Supply voltage. 4.5V ~ 5.5V connected to 5V-standby.
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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105A
BLOCK DIAGRAM
V33 2
V5 3
V12 7
UVAC 5
RI 19
PG 10
GND 15
VCC 20
DSD
UV Detector 0.7V OV Protector 2uA _ COMP + Delay 300msec Vref
14 13
FB1 VREF1
11
UV Protector _ COMP + 64uA 2.1V _ COMP + _ COMP + Delay 7msec Delay 3sec
FB2 VREF2
12
5V
3.2V
NVP
6
Buffer 2.4V
Delay 7msec
Vcc
2.5V D D CK R + _ Q 8uA
_
Q
OPP
4
+
CK _ Q COMP
9
OP1
Buffer
Vcc
Delay 15msec
Error Amp
O.S.C
1.4V
_ COMP +
PSON
1
On/Off Delay 26msec 7.5msec
Delay 2msec
S R
Q
8
OP2
18 SS
17 IN
16 COMP
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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105A
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 SS(on/off)
tOPP
PG
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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105A
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC IOUT VPIN PD,25 PD, TSTG RJA TJ,MAX TA,MAX TL ESD
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 (TA=25C) Power Dissipation (TA=90C) Storage Temperature Range Thermal Resistance, Junction-To-Air Operating Junction Temperature Operating Ambient Temperature Lead Temperature (Soldering, 10 Seconds) Electrostatic Discharge Capability, Human Body Model
Value
16 30 -0.3 to 16 -0.3 to 7 1.5 0.5 -55 to +150 82.5 150 -30 to +125 260 3.0
Unit
V mA V V W W C C /W C C C KV
* All voltage values, except differential voltages, are given with respect to GND pin. * Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device.
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC VFB TA
Parameter
DC Supply Voltage Shunt Regulator Output Fb1, Fb2 Pins Operating Ambient Temperature Range
Test Condition
Value
4.5 to 5.5 4 to 16 -25 to +85
Unit
V V C
* For proper operation.
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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105A
ELECTRICAL CHARACTERISTICS
Values are provided for 4.5VVCC5.5V, TA = -25C~+85C, RI = 75K, unless noted. Symbol
ICC VOVP1 VOVP2 VOVP3 VUVP1 VUVP2 VUVP3 VUVS1 VUVS2 VUVS3 VOPP
(*)
Parameter
Total Supply Current Over-Voltage Protection 3.3V Over-Voltage Protection 5V Over-Voltage Protection 12V Under-Voltage Protection 3.3V Under-Voltage Protection 5V Under-Voltage Protection 12V Under-Voltage Sense 3.3V for PG Low Under-Voltage Sense 5V for PG Low Under-Voltage Sense 12V for PG Low
Test Condition
PG High
Min.
3.9 5.8 13.9 2.0 3.0 6.0 2.5 4.0 9.4 2.25 3.0 0.2 2.0 63 0.37 0.80 0.37 5 3.3
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
Unit
mA V V V V V V V V V V V V V A ms ms ms ms ms
Over-Power Protection (With TOPP Delay Time) VUVAC = 1.5V Over-Power Protection (Without Delay Time) 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
VOPPH VX VNVP INVP TOVP TUVP TUVS TOPP TNVP
Note *: VOPPS = (2/3) x VOPP + (1/3) x VUVAC.
Shunt Regulator Section Current
Symbol
VREF VDEV, I
(**) (**) (**)
Parameter
Reference Voltage Deviation of VREF Over FB Current Deviation of VREF Over Temperature Line Regulation Output Sinking Current Capability
Test Condition
IFB = 0.5mA, TA = 25 IFB = 0.5mA to 10mA
Min.
2.475
Typ.
2.500 10
Max.
2.525 20 30
Unit
V mV mV mV/V mA
VDEV, T IOUT-FB
REGLI-FB
4 VFB 15V VFB = 2V 10
1
** **
Note : Not tested in production.
Power-Good Section
Symbol
TPG VUVAC TR TF
(**) (**)
Parameter
Timing for PG Delay UVAC Voltage Sense for PG Power -Good Output Rising Time Power-Good Falling Time Power-Good Output Saturation Level Power-Good Leakage Current Collector
Test Condition
RI = 75k CL = 100pF, Pull 2.2K to 5V CL = 100pF, Pull 2.2K to 5V IPG = 5mA VPG = 5V
Min.
200 0.68
Typ.
300 0.70 1 300
Max.
400 0.72 3 500 0.5 1
Unit
ms V s ns V A
VOL2 ION2
**
Note : Not tested in production. (c) System General Corp. Version 1.0.1 (IAO33.0072.B0) -9www.sg.com.tw * www.fairchildsemi.com September 25, 2007
Product Specification Power Supply Supervisor + Regulator + PWM
SG6105A
Remote On/Off Section
Symbol
VIH VIL VHYSTERESIS IPSON TPSON(ON) TPSON(OFF) TPSOFF
Parameter
High-level Input Voltage Low-level Input Voltage PSON Input Hysteresis Voltage Remote Input Driving Current Timing PSON to On Timing PSON to Off (PS-off) Timing PG low to Power Off
Test Condition
Min.
2
Typ.
Max.
0.8
Unit
V V V mA ms ms ms
0.3 0.5 RI = 75k RI = 75k RI = 75k 38 8 1.5 50 16 2.0 62 24 6.3
Error Amplifier Section
Symbol
V2.5 IIB
(**) (**)
Parameter
Reference Voltage Input Bias Current Open-Loop Voltage Gain Unity Gain Bandwidth Power Supply Rejection Ratio
Test Condition
TA = 25C
Min.
2.46 50 0.3 50
Typ.
2.50 60 1.0
Max.
2.54 0.1
Unit
V A dB MHz dB
AVOL BW
(**) (**)
PSRR
Note **: Not tested in production.
Oscillator Section
Symbol
FOSC
Parameter
PWM Frequency
Test Condition
RI = 75k
Min.
62
Typ.
65
Max.
68
Unit
KHz
Soft-Start Section
Symbol
ISS
Parameter
Charge Current
Test Condition
Min.
7
Typ.
8
Max.
9
Unit
A
Comparator Section
Symbol
DC
Parameter
Duty Cycle
Test Condition
Min.
85
Typ.
Max.
93
Unit
%
PWM Output Section
Symbol
VOL VOH RO
Parameter
Output Voltage Low Output Voltage High Output Impedance of VOH
Test Condition
IO = 20mA V12=12V
Min.
4 1.5
Typ.
Max.
0.8 3.3
Unit
V V k
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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105A
TYPICAL CHARACTERISTICS
Operating Suppy Current VS Temperature
2. 600
5.700
Referenc e Voltage VS T emperature
5.500
2. 550
ICC-OP(mA)
VR E F (V)
-40 -25 -10 5 20 35 50 65 80 95 110 125
5.300
2. 500
5.100
2. 450
4.900
2. 400
-40 -25 -10 5 20 35 50 65 80 95 110 125
Temperature ( )
T emperature ()
PWM O ut Put Voltage VS T emperature
6.000
67.000
Frequency VS Temperature
VOH (V)
5.000
Fosc(KHZ)
66.000
65.000
4.000
64.000
63.000
3.000 -40 -25 -10 5 20 35 50 65 80 95 110 125
-40
-25
-10
5
20
35
50
65
80
95
110
125
T emperature ()
Temperature (
)
MAX Duty Cycle VS Temperature
89.500 89.450 89.400
2.600
Reference Voltage VS Temperature
) DCMAX(%
89.300 89.250 89.200 89.150 89.100 -40 -25 -10 5 20 35 50 65 80 95 110 125
V2.5(V)
89.350
2.550
2.500
2.450 -40 -25 -10 5 20 35 50 65 80 95 110 125
Temperature ( )
Temperature ( )
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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105A
3.3V VUVP VS Temperature
2.610 2.600 4.180
3.3V VOVP VS Temperature
VUVP(V)
2.580 2.570 2.560 2.550 2.540 -40 -25 -10 5 20 35 50 65 80 95 110 125
VOVP(V)
2.590
4.160
4.140
4.120
4.100 -40 -25 -10 5 20 35 50 65 80 95 110 125
Temperature ( )
Temperature ( )
5V VUVP VS Temperature
3.700
6.180
5V VOVP VS Temperature
3.600
6.160
3.500
VOVP(V)
VUVP(V)
6.140
3.400
6.120
3.300 -40 -25 -10 5 20 35 50 65 80 95 110 125
6.100 -40 -25 -10 5 20 35 50 65 80 95 110 125
Temperature ( )
Temperature ( )
12V VUVP VS T emperature
7.060
14.600
12V VO VP VS T emperature
VUVP(V)
VO VP(V)
7.050
14.550
7.040
14.500
7.030 -40 -25 -10 5 20 35 50 65 80 95 110 125
14.450 -40 -25 -10 5 20 35 50 65 80 95 110 125
T emperature ()
T emperature ()
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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105A
Example of Using SG6105A for the ATX Power Supply
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: 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 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 shunt regulators are built-in to provide stable reference voltages. 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.
APPLICATION GUIDES 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.
FEATURE DESCRIPTIONS
Over-voltage protection can be implemented without any additional components. Over-voltage 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 under-voltage threshold level. PG pin goes high when the above
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 200s, the PG (power-good) signal is pulled low to indicate an AC line power-down condition. The voltage amplitude of the PWM switching
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Product Specification Power Supply Supervisor + Regulator + PWM 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.
SG6105A 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 64A constant current to the negative voltage output. When the NVP voltage is over 2.1V and the situation kept for longer than 7ms, 6105A locks the power outputs off: VNVP = 64A x (R1 + R2) - V-12V (1)
The power outputs are locked off when VNVP 2 . 1 V .
Over-Power Protection (OPP)
The OPP (over-power protection) is used for detecting over-power and/or short-circuit conditions. When OPPS voltage (p.4, Note-1) is higher than 2.1V and this situation exists for longer than 7ms, 6105A pulls the PG low and locks off the power outputs.
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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105A
REFERENCE CIRCUIT
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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105A
BOM
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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105A
PACKAGE INFORMATION 20 PINS - DIP (D)
D
20 11
E1
1 10
E
eB
A2 L b1 b e A1
A
Dimensions:
Symbol
A A1 A2 b b1 D E E1 e L eB
Millimeter Min. Typ.
0.381 3.175 3.302 1.524 0.457 26.162 7.620 6.350 2.540 3.302 9.017 7
Max.
5.334 3.429
Inch Min.
0.015 0.125
Typ.
0.130 0.060 0.018 1.030 0.300 0.250 0.100 0.130 0.355 7
Max.
0.210 0.135
24.892 6.223 2.921 8.509 0
26.924 6.477 3.810 9.525 15
0.980 0.245 0.115 0.335 0
1.060 0.255 0.150 0.375 15
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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105A
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