sg6105
Product Specification
SG6105
Power Supply Supervisor + Regulator + PWM
FEATURES
DESCRIPTION
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
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.
SFX (micro-ATX)
MARKING DIAGRAMS
PIN CONFIGURATION
20
PSON
1
20
VCC
SG6105T
V33
2
19
RI
XXXXXXXYYWWV
V5
3
18
SS
OPP
4
17
IN
UVAC
5
16
COMP
NVP
6
15
GND
V12
7
14
FB1
OP2
8
13
VREF1
OP1
9
12
VREF2
PG
10
11
FB2
1
T: D = DIP
XXXXXXX: Wafer Lot
YY: Year; WW: Week
V: Assembly Location
©System General Corp.
Version 2.3(IRO33.0011.B0)
-1-
www.sg.com.tw
June 19, 2003
Product Specification
SG6105
Power Supply Supervisor + Regulator + PWM
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 forʳCPU 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.
©System General Corp.
Version 2.3(IRO33.0011.B0)
-2-
www.sg.com.tw
June 19, 2003
Product Specification
SG6105
Power Supply Supervisor + Regulator + PWM
BLOCK DIAGRAM
V33
V5
V12
UVAC
RI
PG
GND
VCC
2
3
7
5
19
10
15
20
DSD
Vref
2uA
UV
Detector
0.7V
+
Delay
3sec
UV
Protector
3.2V
FB1
13
VREF1
11
FB2
12
VREF2
Delay
300msec
OV
Protector
5V
14
_ COMP
_ COMP
+
64uA
2.1V
NVP
6
2.4V
OPP
4
_ COMP
2.5V
D
D
_ COMP
_
8uA
Q
Q
CK _
Q
+
CK
Delay
7msec
+
Buffer
Vcc
Delay
7msec
+
Buffer
9
OP1
8
OP2
COMP
R
+
_
1.4V
PSON
1
_ COMP
+
On/Off Delay
26msec
7.5msec
©System General Corp.
Version 2.3(IRO33.0011.B0)
O.S.C
Error
Amp
Delay
15msec
Vcc
S
Delay
2msec
Q
R
18
17
16
SS
IN
COMP
-3-
www.sg.com.tw
June 19, 2003
Product Specification
SG6105
Power Supply Supervisor + Regulator + PWM
TIMING DIAGRAM
VCC
PSON
3.3V,5V,12V
tPSON(ON)
tUVP
NVP
SS(on/off)
PG
tNVP
tPSON(OFF)
tPSOFF
tPG
VCC
PSON
Voltage < VUVAC
UVAC
OPP
tOPP
SS(on/off)
PG
©System General Corp.
Version 2.3(IRO33.0011.B0)
-4-
www.sg.com.tw
June 19, 2003
Product Specification
SG6105
Power Supply Supervisor + Regulator + PWM
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,25к
Power Dissipation (TA=25
1.5
W
PD,90к
Power Dissipation (TA=90
0.5
TSTG
Storage Temperature Range
-55 to +150
RθJA
Thermal Resistance, Junction-To-Air
82.5
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
к)
к)
W
к
к/W
к
к
к
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
к
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 ;
©System General Corp.
Version 2.3(IRO33.0011.B0)
-5-
www.sg.com.tw
June 19, 2003
Product Specification
SG6105
Power Supply Supervisor + Regulator + PWM
Shunt Regulator (FB1, VREF1, FB2, VREF2)
Symbol
Parameter
Test Condition
VREF
Reference Voltage
IFB = 0.5mA, TA = 25
VDEV, I *2
Deviation of VREF Over Load Current
IFB = 0.5mA to 10mA
-
VDEV, T * 2
Deviation of VREF Over Temperature
TA = -25
-
REGLI-FB*2
Line Regulation
4 < VFB < 16V
-
IOUT-FB*2
Output Sinking Current Capability
VFB > 2V
10
к to 85к
к
Min.
Typ.
Max.
Unit
2.475
2.5
2.525
V
-
20
mV
10
30
mV
1
-
mV/V
-
-
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
©System General Corp.
Version 2.3(IRO33.0011.B0)
-6-
www.sg.com.tw
June 19, 2003
Product Specification
SG6105
Power Supply Supervisor + Regulator + PWM
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
©System General Corp.
Version 2.3(IRO33.0011.B0)
-7-
www.sg.com.tw
June 19, 2003
Product Specification
SG6105
Power Supply Supervisor + Regulator + PWM
APPLICATION 1
-12V
+
MAIN
Transformer
12V
+
5V
+
3.3V
+
UVAC
V33
V5
3.3V
V12
VCC
5Vsb
VREF2
5Vsb
47~100ohm
STBY
Transformer
PG
FB2
PSON
VREF1
+
OP1
SG6105
FB1
Pok
1Kohm
PSon
NVP
-12V
RI
-5V
GND
5V
Vdd
IN
12V
COMP
OP2
SS
OPP
©System General Corp.
Version 2.3(IRO33.0011.B0)
-8-
www.sg.com.tw
June 19, 2003
Product Specification
SG6105
Power Supply Supervisor + Regulator + PWM
APPLICATION 2
OPP
R61
CN2
3
2
1
R62
1
C39
F2
C40
2
2
1
OP1
D26
R63
L11
2
R65
2
D29
2
1
R66
+
1 Q13
C44
2
2
R71
R69
C48
OP2
1
1
2
3
2
4
5
10
TR2
2
2
2
10
6
8
U5
1
9
D35
D34
T7
E16-D
+
BD1
2
1
6
D33
5
2
4
R70
3
T6
C47
Q14
2
2
1
3
C46
D32
4
4
1
HHV
D31
3
1
T5
D30
R67
R68
3
1
+
3
1
2
U4
SG6848
NC FB GND
SEN NC VDD Gate
4
L12
D28
C42
C78
3
Q12
D27
8
2
7
8
RI
6
2
5
1
1
2 1
R64
1
C45
+
2
1
2
3
1
C50
R75
D37
D38
R73
1
2
2
1
2
4
1
C49
R74
R77
R78
C52
1
C51
R79
C53
R80
R81
R82
1
1
R85
3
C56
3
Q15
1 L13
C57
2
2
VZ3
Q16
D39
2
2
2
VZ4
1
2
1
D40
1
2
1
HHV
+
R87
C58
7
D41
R88
5
C59
5VSB
C69
14
9
8
13
12
11
UVAC
10
T8
C60
V5
5V
3
VCC
V33
RI
V5
SS
D45
20
19
18
C61
C62
R91
-12V
7
GND
V12
FB1
OP2
VREF1
OP1
VREF2
16
5V
R94
12V
C64
R95
15
R97
14
L14
FB1
R98
3
12V
NVP
COMP
8
13
VR3
2
VREF1
D43
R99
C65
C66
D44
2
OP2
1
1
6
UVAC
1
R96
5
2
UVAC
C63
1
R92
R93
3
1
IN
2
OPP
17
3
1
4
OPP
D42
D46
R90
2
PSON
2
2
3.3V
-5V
1
1
U6
PSON
R89
R103
1
R104
2
R86
R84
R83
+
C55
VREF1
C54
+
+
+
FB1
1
R76
Q17
Q18
2
VREF2
7
5
3
D48
SG6105
R101
R102
C68
2
2
Q19
C67
PG
1
FB2
L15
D47
2
8
6
4
10
1
2
11
2
12
9
FB2
3
1
PG
1
10
1
9
OP1
R100
3
C73
C72
2
+
1
C74
R113
VREF2
1
L20
R115
1
C71
L19
-12V
+
+
+
L16
1
Q20
2
C75
R110
R111
2
R112
V5
R107
2
C79
L17
2
1
L18
+
FB2
+
1
C70
+
1
R109
U7
LM7905
GND
3.3V
C77
+
3.3VSENCE
3
VO
R106
5V
VI
+
R116
R105
12V
2
2
C76
-5V
©System General Corp.
Version 2.3(IRO33.0011.B0)
-9-
www.sg.com.tw
June 19, 2003
Product Specification
SG6105
Power Supply Supervisor + Regulator + PWM
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.
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.
The features and benefits of this device are listed
below:
Supervisory Circuit Operation
Example of Using SG6105 for the ATX
Power Supply
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
©System General Corp.
Version 2.3(IRO33.0011.B0)
- 10 -
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
www.sg.com.tw
June 19, 2003
Product Specification
SG6105
Power Supply Supervisor + Regulator + PWM
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
Vin
R1
+
R2
C1
UVAC
0.7V
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
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.
The power outputs will be locked off when VNVP ≥
2.1V.
64uA
R1
+
OP1
R2
-12V
2.1V
-5V
Vdd
R1
OP2
R2
OPP
C1
©System General Corp.
Version 2.3(IRO33.0011.B0)
R3
- 11 -
www.sg.com.tw
June 19, 2003
Product Specification
SG6105
Power Supply Supervisor + Regulator + PWM
MECHANICAL DIMENSIONS
20 PINS – DIP (D)
Ӱ
D
11
20
E1
eB
E
10
1
A2
A
L
e
b1
A1
b
Dimension
Symbol
A
A1
A2
b
b1
D
E
E1
e
L
eB
θ˚
Millimeter
Min.
Typ.
Max.
Inch
Min.
Typ.
5.334
0.381
3.175
24.892
6.223
2.921
8.509
0̓
©System General Corp.
Version 2.3(IRO33.0011.B0)
3.302
1.524
0.457
26.162
7.620
6.350
2.540
3.302
9.017
7̓
3.429
0.015
0.125
26.924
0.980
6.477
0.245
3.810
9.525
15̓
0.115
0.335
0̓
- 12 -
Max.
0.210
0.130
0.060
0.018
1.030
0.300
0.250
0.100
0.130
0.355
7̓
0.135
1.060
0.255
0.150
0.375
15̓
www.sg.com.tw
June 19, 2003
Product Specification
SG6105
Power Supply Supervisor + Regulator + PWM
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.
©System General Corp.
Version 2.3(IRO33.0011.B0)
- 13 -
www.sg.com.tw
June 19, 2003
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