Product Specification
Power Supply Supervisor + Regulator + PWM
SG6105
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.
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)
MARKING DIAGRAMS
20
PIN CONFIGURATION
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
FB1
VREF1
VREF2
FB2
SG6105T
XXXXXXXYYWWV
V33
V5
OPP
1
UVAC
NVP
V12
T:
D = DIP
XXXXXXX:
Wafer Lot
YY:
Year;
WW:
Week
V:
Assembly Location
OP2
OP1
PG
©System General Corp.
Version 2.3(IRO33.0011.B0)
-1-
www.sg.com.tw
June 19, 2003
Product Specification
Power Supply Supervisor + Regulator + PWM
SG6105
ORDERING INFORMATION
Part Number
SG6105D
Package
20-Pin DIP
PIN DESCRIPTIONS
Name
VCC
PG
V33
V5
V12
OPP
Pin
20
10
2
3
7
4
Type
Supply
Logic output
Analog input
Analog input
Analog input
Analog input
Function
Supply voltage. 4.5V ~ 5.5V. It is connected to 5V-standby.
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.
3.3V over-voltage/under-voltage control sense input.
5V over-voltage/under-voltage control sense input.
12V 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.
Remote On/Off logic input for CPU 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.
The protection input for negative output, such as –12V and/or –5V. Trip voltage = 2.1V.
AC fail detection, detect main AC voltage under-voltage and/or failure.
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. It is settable through external capacitor. The current source output at this pin is 8uA and
the voltage is clamped at 2.5V.
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%.
Output for first converter regulation loop.
Reference comparison input for first converter regulation loop. 2.5V.
Output for second converter regulation loop.
Reference comparison input for second converter regulation loop. 2.5V.
Connected to external resistor for the reference setting.
RI = 75k ohms.
Ground.
PSON
1
Logic input
NVP
UVAC
COMP
IN
SS
OP1/OP2
FB1
VREF1
FB2
VREF2
RI
GND
6
5
16
17
18
9/8
14
13
11
12
19
15
Analog input
Analog input
Analog output
Analog input
Analog input
Analog output
Analog output
Analog input
Analog output
Analog input
Program.
Analog input
Supply
©System General Corp.
Version 2.3(IRO33.0011.B0)
-2-
www.sg.com.tw
June 19, 2003
Product Specification
Power Supply Supervisor + Regulator + PWM
SG6105
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
Delay
3sec
FB2
VREF2
12
5V
3.2V
_ COMP
+
64uA
2.1V
_ COMP
+
_ COMP
+
NVP
6
Buffer
Delay
7msec
Vcc
2.5V
D
D
Q
8uA
_
Q
2.4V
OPP
4
Buffer
Delay
7msec
CK
R
+
_
+
CK
_
Q
COMP
9
OP1
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
©System General Corp.
Version 2.3(IRO33.0011.B0)
-3-
www.sg.com.tw
June 19, 2003
Product Specification
Power Supply Supervisor + Regulator + PWM
SG6105
TIMING DIAGRAM
VCC
PSON
3.3V,5V,12V
t
PSON(ON)
NVP
t
PSON(OFF)
t
UVP
t
NVP
SS(on/off)
t
PSOFF
PG
t
PG
VCC
PSON
Voltage < V
UVAC
UVAC
OPP
t
OPP
SS(on/off)
PG
©System General Corp.
Version 2.3(IRO33.0011.B0)
-4-
www.sg.com.tw
June 19, 2003
Product Specification
Power Supply Supervisor + Regulator + PWM
SG6105
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
V
FB
I
OUT
P
D,25
P
D,90
T
STG
R
θJA
T
J,MAX
T
A,MAX
T
L
Parameter
DC Supply Voltage at Pin 20
Shunt Regulator Output at Fb1, Fb2 Pins
Output Current at PG, Fb1, Fb2 Pins
Power Dissipation (T
A
=25
Power Dissipation (T
A
=90
Storage Temperature Range
Thermal Resistance, Junction-To-Air
Operating Junction Temperature
Operating Ambient Temperature
Lead Temperature (Soldering, 10sec)
ESD Capability, HBM model
)
)
Value
16
16
30
1.5
0.5
-55 to +150
82.5
150
-30 to +125
260
3.0
Unit
V
V
mA
W
W
/W
kV
Note: All voltage values, except differential voltage, are with respect to network ground terminal.
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
FB
T
OPER
Parameter
DC Supply Voltage at Pin 20
Shunt Regulator Output at Fb1, Fb2 Pins
Operating Ambient Temperature Range
Value
4.5 to 5.5
4 to 16
-25 to +85
Unit
V
V
ELECTRICAL CHARACTERISTICS (V
CC
= 5V, T
A
= 25°C)
°
Symbol
I
CC
V
OVP1
V
OVP2
V
OVP3
V
UVP1
V
UVP2
V
UVP3
V
UVS1
V
UVS2
V
UVS3
V
OPPS
*
V
NVP
I
NVP
t
OVP
t
UVP
t
UVS
t
OPP
t
NVP
1
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
Over-Power Protection.
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
Test Condition
PG High
-
-
-
-
-
-
-
-
-
V
UVAC
= 1.5V
-
RI = 75kΩ
RI = 75kΩ
RI = 75kΩ
RI = 75kΩ
RI = 75kΩ
RI = 75kΩ
Min.
-
3.9
5.8
13.9
2.0
3.0
6.0
2.5
4.0
9.4
2.02
2.0
57
0.37
0.8
0.37
3.3
3.3
Typ.
5
4.1
6.1
14.5
2.6
3.6
7.2
2.8
4.3
10.1
2.4
2.1
64
0.7
2.4
1.2
7
7
Max.
10
4.3
6.5
14.9
2.8
3.9
8.0
3.0
4.5
10.4
2.66
2.2
72
1.35
3.75
1.88
11.3
10.2
Unit
mA
V
V
V
V
V
V
V
V
V
V
V
uA
ms
ms
ms
ms
ms
Note
*1
: V
OPPS
= (2/3) x V
OPP
+ (1/3) x V
UVAC
;
©System General Corp.
Version 2.3(IRO33.0011.B0)
-5-
www.sg.com.tw
June 19, 2003
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