Product Specification Power Supply Supervisor + Regulator + PWM SG6105
©System General Corp. - 1 - www.sg.com.tw Version 2.3(IRO33.0011.B0) June 19, 2003
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 regulator 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, such as:
ATX NLX SFX (micro-ATX)
DESCRIPTION SG6105 controller is designed for switching mode
power supply 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, some protection features against over-voltage and over-power are implemented. It directly senses all the output rails for OVP without the need of external dividers. An innovated AC-signal sampling circuitry provides a sufficient power-down warning signal for PG. A built-in timer generates accuracy timing for control circuit including the PS-off delay. The cycle-by-cycle PWM switching prevents the power transformer from the saturation and ensures the fastest response for the short-circuit protection which greatly reduce the stress for power transistors. Two internal precision TL431 shunt regulators provide stable reference voltage and driver for 3.3V and 5V-standby regulation. Utilizing minimum number of external components, the SG6105 includes all of the functions for push-pull and/or half-bridge topology, decreasing the production cost and PCB space, and increasing the MTBF for power supply.
MARKING DIAGRAMS PIN CONFIGURATION
T: D = DIP XXXXXXX: Wafer Lot YY: Year; WW: Week V: Assembly Location
20
1
SG6105TXXXXXXXYYWWV
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
PSON
V33
V5
OPP
UVAC
NVP
V12
OP2
OP1
PG FB2
VREF2
VREF1
FB1
GND
COMP
IN
SS
RI
VCC
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Product Specification Power Supply Supervisor + Regulator + PWM SG6105
©System General Corp. - 2 - www.sg.com.tw Version 2.3(IRO33.0011.B0) June 19, 2003
ORDERING INFORMATION Part Number Package SG6105D 20-Pin DIP
PIN DESCRIPTIONS Name Pin Type Function VCC 20 Supply Supply voltage. 4.5V ~ 5.5V. It is connected to 5V-standby.
PG 10 Logic output Power Good logic output, 0 or 1 (open-collector). PG = 1 means that the power is good for operation. The PG delay is 300 msec.
V33 2 Analog input 3.3V over-voltage/under-voltage control sense input. V5 3 Analog input 5V over-voltage/under-voltage control sense input. V12 7 Analog input 12V over-voltage/under-voltage control sense input.
OPP 4 Analog 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.
PSON 1 Logic input
Remote On/Off logic input forCPU or controller. Turn on/off the PWM Output after the 7.5 msec / 26 msec delay. PSON = 0 means that the main SMPS is operational. PSON =1 means that the main SMPS is off and the latch is reset.
NVP 6 Analog input The protection input for negative output, such as –12V and/or –5V. Trip voltage = 2.1V. UVAC 5 Analog input AC fail detection, detect main AC voltage under-voltage and/or failure. COMP 16 Analog output Error amplifier output and the input of the PWM comparator. IN 17 Analog input The negative input of error amplifier. The positive input of error amplifier is a 2.5V reference voltage.
SS 18 Analog input The soft-start. It is settable through external capacitor. The current source output at this pin is 8uA and the voltage is clamped at 2.5V.
OP1/OP2 9/8 Analog output 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%.
FB1 14 Analog output Output for first converter regulation loop. VREF1 13 Analog input Reference comparison input for first converter regulation loop. 2.5V. FB2 11 Analog output Output for second converter regulation loop. VREF2 12 Analog input Reference comparison input for second converter regulation loop. 2.5V.
RI 19 Program. Analog input
Connected to external resistor for the reference setting. RI = 75k ohms.
GND 15 Supply Ground.
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Product Specification Power Supply Supervisor + Regulator + PWM SG6105
©System General Corp. - 3 - www.sg.com.tw Version 2.3(IRO33.0011.B0) June 19, 2003
BLOCK DIAGRAM
SS
2.5V
8uA
Vcc
NVP + 6 Delay 7msecBuffer
2.1V
3.2V
V33
V5
2 3
5V
64uA
UVAC
V12
7
5
UV Detector
OV Protector
UV Protector
COMP_
COMP
+
_
COMP_
DSD
0.7V +
2uA
2.4V
OPP 4 Buffer
Vcc
PSON 1 +
1.4V _ Delay 2msec
Delay15msec
COMP_
+ Delay 7msec
On/Off Delay26msec7.5msec
COMP
QD
CKR
18
OP1
PG
10
RI
19
GND
15 20
VCC
Delay300msec
Vref
Delay 3sec
FB2 11
VREF1 13
FB1 14
VREF2 12
+
Error Amp
_
COMP
_
+
O.S.C
COMP
16 17
IN
Q_CK
D Q
R
S Q
OP2 8
9
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Product Specification Power Supply Supervisor + Regulator + PWM SG6105
©System General Corp. - 4 - www.sg.com.tw Version 2.3(IRO33.0011.B0) June 19, 2003
TIMING DIAGRAM
VCC
PSON
3.3V,5V,12V
tPSON(ON) tUVP
NVP tPSON(OFF) tNVP
SS(on/off) tPSOFF
PG tPG
VCC
PSON
Voltage < VUVAC
UVAC
OPP tOPP
SS(on/off)
PG
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Product Specification Power Supply Supervisor + Regulator + PWM SG6105
©System General Corp. - 5 - www.sg.com.tw Version 2.3(IRO33.0011.B0) June 19, 2003
ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit VCC DC Supply Voltage at Pin 20 16 V VFB Shunt Regulator Output at Fb1, Fb2 Pins 16 V IOUT Output Current at PG, Fb1, Fb2 Pins 30 mA PD,25 Power Dissipation (TA=25) 1.5 W PD,90 Power Dissipation (TA=90) 0.5 W TSTG Storage Temperature Range -55 to +150 RθJA Thermal Resistance, Junction-To-Air 82.5 /W TJ,MAX Operating Junction Temperature 150 TA,MAX Operating Ambient Temperature -30 to +125 TL Lead Temperature (Soldering, 10sec) 260 ESD Capability, HBM model 3.0 kV
Note: All voltage values, except differential voltage, are with respect to network ground terminal.
RECOMMENDED OPERATING CONDITIONS Symbol Parameter Value Unit VCC DC Supply Voltage at Pin 20 4.5 to 5.5 V VFB Shunt Regulator Output at Fb1, Fb2 Pins 4 to 16 V TOPER Operating Ambient Temperature Range -25 to +85
ELECTRICAL CHARACTERISTICS (VCC = 5V, TA = 25°°°°C) Symbol Parameter Test Condition Min. Typ. Max. Unit ICC Total Supply Current PG High - 5 10 mA VOVP1 Over-Voltage Protection 3.3V - 3.9 4.1 4.3 V VOVP2 Over-Voltage Protection 5V - 5.8 6.1 6.5 V VOVP3 Over-Voltage Protection 12V - 13.9 14.5 14.9 V VUVP1 Under-Voltage Protection 3.3V - 2.0 2.6 2.8 V VUVP2 Under-Voltage Protection 5V - 3.0 3.6 3.9 V VUVP3 Under-Voltage Protection 12V - 6.0 7.2 8.0 V VUVS1 Under-Voltage Sense 3.3V for PG Low - 2.5 2.8 3.0 V VUVS2 Under-Voltage Sense 5V for PG Low - 4.0 4.3 4.5 V VUVS3 Under-Voltage Sense 12V for PG Low - 9.4 10.1 10.4 V VOPPS* 1 Over-Power Protection. VUVAC = 1.5V 2.02 2.4 2.66 V VNVP Negative Voltage Protection: Voltage Level - 2.0 2.1 2.2 V INVP Negative Voltage Protection: Source Current RI = 75kΩ 57 64 72 uA tOVP Timing for Over-Voltage Protection RI = 75kΩ 0.37 0.7 1.35 ms tUVP Timing for Under-Voltage Protection RI = 75kΩ 0.8 2.4 3.75 ms tUVS Timing for Under-Voltage Sense for PG Low RI = 75kΩ 0.37 1.2 1.88 ms tOPP Timing for Over-Power-Protection RI = 75kΩ 3.3 7 11.3 ms tNVP Timing for Negative Voltage Protection RI = 75kΩ 3.3 7 10.2 ms
Note *1: VOPPS = (2/3) x VOPP + (1/3) x VUVAC ;
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Product Specification Power Supply Supervisor + Regulator + PWM SG6105
©System General Corp. - 6 - www.sg.com.tw Version 2.3(IRO33.0011.B0) June 19, 2003
Shunt Regulator (FB1, VREF1, FB2, VREF2) Symbol Parameter Test Condition Min. Typ. Max. Unit VREF Reference Voltage IFB = 0.5mA, TA = 25 2.475 2.5 2.525 V VDEV, I
*2 Deviation of VREF Over Load Current IFB = 0.5mA to 10mA - - 20 mV VDEV, T * 2 Deviation of VREF Over Temperature TA = -25 to 85 - 10 30 mV REGLI-FB
*2 Line Regulation 4 < VFB < 16V - 1 - mV/VIOUT-FB
*2 Output Sinking Current Capability VFB > 2V 10 - - mA Note *2: Not tested in production test.
Power Good Section Symbol Parameter Test Condition Min. Typ. Max. Unit tPG Timing for PG Delay RI = 75kΩ 200 300 400 ms VUVAC UVAC Voltage Sense for PG - 0.65 0.7 0.75 V tR
*2 PG Good Output Rising Time CL = 100pF - 1 - us tF
*2 PG Good Falling Time CL = 100pF - 300 - ns VOL2 Power Good Output Saturation Level IPG = 5mA - - 0.5 V ION2 Power Good Leakage Current Collector VPG = 5V - - 1 uA
Remote On/Off Symbol Parameter Test Condition Min. Typ. Max. Unit VPSON PSON Input Threshold Level - 1 1.4 2.0 V IPSON Remote Input Driving Current - - - 0.5 mA
tPSON(ON)
tPSON(OFF)
Timing PSON to On/Off On Off (PS-off)
RI = 75kΩ 17 5
26 7.5
45 28.8
ms
tPSOFF Timing PG low to Power Off RI = 75kΩ 1.5 2 6.3 ms
Error Amplifier Symbol Parameter Test Condition Min. Typ. Max. Unit V2.5 Reference Voltage - 2.45 2.5 2.55 V IIB
*2 Input Bias Current - - - 0.1 uA AVOL * 2 Open-Loop Voltage Gain - 50 60 - dB BW * 2 Unity Gain Bandwidth - 0.3 1 - MHz PSRR * 2 Power Supply Rejection Ratio - 50 - - dB
Oscillator Section Symbol Parameter Test Condition Min. Typ. Max. Unit FOSC PWM Frequency RI = 75kΩ 60 65 70 KHz
Soft-Start Section Symbol Parameter Test Condition Min. Typ. Max. Unit ISS Charge Current RI = 75kΩ 6 8 9.3 uA
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Product Specification Power Supply Supervisor + Regulator + PWM SG6105
©System General Corp. - 7 - www.sg.com.tw Version 2.3(IRO33.0011.B0) June 19, 2003
Comparator Section Symbol Parameter Test Condition Min. Typ. Max. Unit DC Duty Cycle - 85 - 93 %
PWM Output Section (OP1, OP2) Symbol Parameter Test Condition Min. Typ. Max. Unit VOL Output Voltage Low Io = 5mA - - 0.5 V VOH Output Voltage High V12 = 12V 4 - - V RO Output Impedance of VOH - 1.5 - 3.3 kΩ
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Product Specification Power Supply Supervisor + Regulator + PWM SG6105
©System General Corp. - 8 - www.sg.com.tw Version 2.3(IRO33.0011.B0) June 19, 2003
APPLICATION 1
+
+
+
+
1Kohm
47~100ohm
3.3V
V33
V5
V12
VCC
GND
PG
RI
PSON
NVP
STBY Transformer
+
5Vsb
3.3V
FB2
VREF1
FB1
OPP
UVAC
VREF2
-5V
-12V
PSon
Pok
5Vsb
MAIN Transformer
5V
-12V
12V
Vdd
OP1
OP2
IN
COMP
SS
5V
12V
SG6105
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Product Specification Power Supply Supervisor + Regulator + PWM SG6105
©System General Corp. - 9 - www.sg.com.tw Version 2.3(IRO33.0011.B0) June 19, 2003
APPLICATION 2
FB1
3.3V
-12V
3.3V
12V
12V
OP2
12V
-5V5V
V5
5V
UVAC
PG
5V
OP2
PSON
-5V
OPP
OPP
VREF2
VREF1
V5
-12V
VREF1
FB2
OP1
OP1
HHV
HHV
5VSB
FB1
UVAC
3.3VSENCE
VREF2
FB2
T5
2
13
4
CN2
123
T64 23
9
5 10 8
6
L12
12
F2
12
L11
12
C47
C44
R63
C46
BD1
2
1
3
4
+
C54
+
C53
TR2
12
R96
VZ312
VZ412
R81 R82
R88C59
D402 1
C58
D392 1
Q16
1
3 2
R80
Q15
1
3 2
R77 R78
R79
R75R74
D35
21
+C49
+C50
D30
21
R65
D34
21
C39
D282 1
R62
D292 1
R61
D27
21
Q12
2
1 3
Q13
2
1 3
+
C42
U7LM7905
2
1
3V
I
GND
VO
D26
21
C65 C66
L16
12
L18
12 L19
12
L20
12
+
C72
+
C70
R107
R110
+
C77
+
C71
+
C76
+
C75
+
C73
R104
R116
R103
R101
D46
21
D45
21
L1412
C67
R98 R99D43
21
D44
21
Q17
132
L17
12
R95 C64
R111
Q18
132
C61
R89
L131
2
T8
57
149813121011
R85
C56+
C51
+
C52
D37
21
D38
21
R84
+
C57
U5
123 4
R76
R86
R83
R87
D48
21
D4721
U6
SG6105
1
2
3
4
5
6
7
8 13
14
15
16
17
18
19
20
9
10 11
12
PSON
V33
V5
OPP
UVAC
NVP
V12
OP2 VREF1
FB1
GND
COMP
IN
SS
RI
VCC
OP1
PG FB2
VREF2
Q20
1
32
R115
R112
R113
R109R105 R106
R91
C62
R90
R94
+C74
C63
VR3
31
2
R93
R97
D42
21
R92
D332
1
R100
R73
T7E16-D
108654 12
L15
12
7810
9 356 4
C60
C55
C40
D41+
C78
+
C79
C69
R69
R71R68
R70
R67
C48
R66
D31
21
U4SG6848
1234
5 6 7 8
GateVDDNCSEN
RI NC FB GND
C45
R64
D32
21
Q141
23
Q19
132
R102
C68
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Product Specification Power Supply Supervisor + Regulator + PWM SG6105
©System General Corp. - 10 - www.sg.com.tw Version 2.3(IRO33.0011.B0) June 19, 2003
Example of Using SG6105 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 also add to assembling costs. This single chip controller IC provides complete protection circuits, shunt regulators, and PWM control function and with less number of components. SG6105 is an ideal controller IC for PC switching mode power supplies.
The features and benefits of this device are listed below:
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 regulator 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
FEATURE DESCRIPTIONS Over voltage protection can be implemented without
any additional components. Over-voltage sense Levels or 3.3V, 5V, 12V are 4.1V, 6.1V, 14.5V respectively.
Over current and/or short circuit protection can also be achieved by using over-power protection, in which 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 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 of SG6105 will be shutdown and reset. No extra power supply is needed.
Two internal high precision 431 shunt regulators are built-in. It provides 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-feature of SG6105 and illustrates how to use in an ATX switching mode power supply (SMPS). SG6105 is suitable for half-bridge, push-pull topology. It incorporates with a 4-channel supervisor, including 5V-standby. The PWM section of SG6105 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. SG6105 has OVP and UVP for 12V, 5V and 3.3V. Besides, the 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.
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 200usec, the PG (power good) signal will be pulled low to indicate an AC line power-down condition. The voltage amplitude of the
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Product Specification Power Supply Supervisor + Regulator + PWM SG6105
©System General Corp. - 11 - www.sg.com.tw Version 2.3(IRO33.0011.B0) June 19, 2003
+ R2R1
2.1V
64uA
-12V
-5V
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.
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 existed for longer than 7 msec, 6105 will pull the PG low and lock off the power outputs.
Vdd
OPP
OP2
OP1
R1 R2
R3C1
Negative Voltage Protection The NVP provides an UVP (under voltage protection)
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 64uA constant current to the negative voltage output. When the NVP voltage is over 2.1V and the situation kept for longer than 7 msec, 6105 will lock the power outputs off.
VNVP = 64 uA × (R1 + R2) – V-12V
The power outputs will be locked off when VNVP ≥ 2.1V.
+UVAC
Vo
0.7V
R1
R2 C1
VS
Vin
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Product Specification Power Supply Supervisor + Regulator + PWM SG6105
©System General Corp. - 12 - www.sg.com.tw Version 2.3(IRO33.0011.B0) June 19, 2003
MECHANICAL DIMENSIONS 20 PINS – DIP (D)
eBE
AA2
e
A1
L
b
b1
101
D20 11
E1
Dimension
Millimeter InchSymbol Min. Typ. Max. Min. Typ. Max. A 5.334 0.210 A1 0.381 0.015 A2 3.175 3.302 3.429 0.125 0.130 0.135 b 1.524 0.060 b1 0.457 0.018 D 24.892 26.162 26.924 0.980 1.030 1.060 E 7.620 0.300 E1 6.223 6.350 6.477 0.245 0.250 0.255 e 2.540 0.100 L 2.921 3.302 3.810 0.115 0.130 0.150 eB 8.509 9.017 9.525 0.335 0.355 0.375 θ˚ 0 7 15 0 7 15
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Product Specification Power Supply Supervisor + Regulator + PWM SG6105
©System General Corp. - 13 - www.sg.com.tw Version 2.3(IRO33.0011.B0) June 19, 2003
DISCLAIMERS
LIFE SUPPORT
System General’s products are not designed to be used as components in devices intended to support or sustain human life. Use of System General’s products in components intended for surgical implant into the body, or other applications in which failure of the System General’s products could create a situation where personal death or injury may occur, is not authorized without the express written approval of System General’s Chief Executive Officer. System General will not be held liable for any damages or claims resulting from the use of its products in medical applications.
MILITARY
System General's products are not designed for use in military applications. Use of System General’s products in military applications is not authorized without the express written approval of System General’s Chief Executive Officer. System General will not be held liable for any damages or claims resulting from the use of its products in military applications.
RIGHT TO MAKE CHANGES
System General reserves the right to change this document and/or this product without notice. Customers are advised to consult their System General sales representative before ordering.
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