Product Specification
Power Factor Controller
SG6961
DESCRIPTION
The SG6961 is an 8-pin boundary mode PFC controller IC
intended for controlling PFC pre-regulators. The SG6961
provides a controlled on-time to regulate the output DC
voltage and achieve natural power factor correction. The
maximum on-time of the external switch is programmable
to ensure safe operation during AC brownouts. An
innovative multi-vector error amplifier is built in to
provide rapid transient response and precise output
voltage clamping. A built-in circuit disables the controller
if the output feedback loop is opened. The start-up current
is lower than 20µA and the operating current is under
4.5mA. The supply voltage can be up to 20V, maximizing
application flexibility.
FEATURES
Boundary Mode PFC Controller
Low Input Current THD
Controlled On-Time PWM
Zero-Current Detection
Cycle-by-Cycle Current Limiting
Leading-Edge Blanking Instead of RC Filtering
Low Start-up Current (10µA Typical)
Low Operating Current (4.5mA Typical)
Feedback Open-Loop Protection
Programmable Maximum On-Time (MOT)
Output Over-Voltage Clamping Protection
Clamped Gate Output Voltage 16.5V
APPLICATIONS
Electric Lamp Ballasts
AC-DC Switching Mode Power Converter
Open-Frame Power Supplies and Power Adapters
Flyback Power Converters with ZCS/ZVS
TYPICAL APPLICATION
Vo
VAC
ZCD
VCC
MOT
COMP
INV
GD
SG6961
GND
CS
© System General Corp.
Version 1.3.1 (IRO33.0028.B6)
-1-
www.sg.com.tw • www.fairchildsemi.com
September 24, 2007
Product Specification
Power Factor Controller
SG6961
PIN CONFIGURATION
MARKING DIAGRAMS
SG6961TP
XXXXXXXXYWWV
T:
D=DIP, S=SOP
P :
Z=Lead Free + ROHS
Compatible
Null=regular package
XXXXXXXX:
Wafer Lot
Y:
Year;
WW:
Week
V:
Assembly Location
INV
COMP
MOT
CS
VCC
GD
GND
ZCD
ORDERING INFORMATION
Part Number
SG6961SZ
SG6961DZ
Pb-Free
Package
8-Pin SOP
8-Pin DIP
PIN DESCRIPTIONS
Pin No.
1
2
3
4
Symbol
INV
COMP
MOT
CS
Description
Inverting input of the error amplifier. INV is connected to the converter output via a resistive divider. This pin
is also used for over-voltage clamping and open-loop feedback protection.
The output of the error amplifier. To create a precise clamping protection, a compensation network between
this pin and GND is suggested.
A resistor from MOT to GND is used to determine the maximum on-time of the external power MOSFET. The
maximum output power of the converter is a function of the maximum on-time.
Input to the over-current protection comparator. When the sensed voltage across the sense resistor reaches
the internal threshold (0.82V), the switch is turned off to activate cycle-by-cycle current limiting.
Zero Current Detection. This pin is connected to an auxiliary winding via a resistor to detect the zero crossing
of the switch current. When the zero crossing is detected, a new switching cycle is started. If it is connected
to GND, the device is disabled.
The power ground and signal ground. Placing a 0.1µF decoupling capacitor between the VCC and GND pins
is recommended.
Totem-pole driver output to drive the external power MOSFET. The clamped gate output voltage is 16.5V.
Driver and control circuit supply voltage.
5
ZCD
6
7
8
GND
GD
VCC
© System General Corp.
Version 1.3.1 (IRO33.0028.B6)
-2-
www.sg.com.tw • www.fairchildsemi.com
September 24, 2007
Product Specification
Power Factor Controller
SG6961
BLOCK DIAGRAM
© System General Corp.
Version 1.3.1 (IRO33.0028.B6)
-3-
www.sg.com.tw • www.fairchildsemi.com
September 24, 2007
Product Specification
Power Factor Controller
SG6961
ABSOLUTE MAXIMUM RATINGS
Symbol
V
DD
V
HIGH
V
LOW
V
zcd
P
D
R
θ
J-A
T
J
T
STG
T
L
ESD
Parameter
DC Supply Voltage*
GD
Others (INV, COMP, MOT, CS,)
Input Voltage to ZCD Pin
Power Dissipation
Thermal Resistance (Junction-to-Air)
Operating Junction Temperature
Storage Temperature Range
Lead Temperature (Wave Soldering or Infrared, 10 Seconds)
Electrostatic Discharge Capability, Human Body Model
Electrostatic Discharge Capability, Machine Model
DIP-8
SOP-8
DIP-8
SOP-8
Value
25
-0.3 to 25.0
-0.3 to 7.0
-0.3 to 12.0
800
400
48.45
62.70
-40 to + 150
-65 to + 150
260
2.0
200
Unit
V
V
V
V
mW
°C/W
°C
°C
°C
kV
V
* 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.
ELECTRICAL CHARACTERISTICS
V
CC
=15V, T
A
=-20°C~125°C, unless otherwise noted.
V
CC
Section
Symbol
V
OP
V
TH-ON
V
TH-OFF
I
CC-ST
I
CC-OP
V
CC-OVP
T
VCC-OVP
Parameter
Continuously Operating Voltage
Turn-On Threshold Voltage
Turn-Off Voltage
Start-Up Current
Operating Current
V
CC
Over-Voltage Protection*
V
CC
OVP Debounce Time*
Test Condition
Min.
11
8.2
Typ.
12
9.5
10
4.5
24
30
Max.
20
13
10.5
20
6.0
Unit
V
V
V
µA
mA
V
µs
V
CC
=V
TH-ON
–0.16V
V
CC
=12V, V
CS
=0, C
L
=3nF,
F
SW
=50KHz
* Guaranteed by design.
Error Amplifier Section
Symbol
V
REF
Gm
V
INVH
V
INVL
V
OUT HIGH
V
OZ
V
INV-OVP
V
INV-UVP
I
COMP
Parameter
Reference Voltage
Transconductance*
Clamp High Feedback Voltage
Clamp Low Feedback Voltage
Output High Voltage
Zero Duty Cycle Output Voltage
Over-Voltage Protection for INV Input*
Under-Voltage Protection for INV Input
Source Current
Sink Current
Test Condition
T
A
=25°C
Min.
2.45
100
2.22
4.8
1.15
0.40
Typ.
2.50
125
2.65
2.30
1.35
2.75
0.45
20
800
20
Max.
2.55
150
2.70
Unit
V
µmho
V
V
V
1.45
0.50
V
V
V
µA
µA
µA
V
INV
=2.35V, V
COMP
=1.5V
V
INV
=1.5V
V
INV
=2.65V, V
COMP
=5V
7
450
10
* Guaranteed by design.
© System General Corp.
Version 1.3.1 (IRO33.0028.B6)
-4-
www.sg.com.tw • www.fairchildsemi.com
September 24, 2007
Product Specification
Power Factor Controller
SG6961
Current Sense Section (V
LIMIT
)
Symbol
V
PK
T
PKD
T
BNK
Parameter
Threshold Voltage for Peak Current Limit
Cycle–by-Cycle Limit
Propagation Delay
Leading-Edge Blanking Time
Test Condition
V
COMP
=5V
Min.
0.77
Typ.
0.82
Max.
0.87
200
Unit
V
ns
ns
R
MOT
=24kΩ
400
550
Gate Section
Symbol
VZ-
OUT
V
OL
V
OH
T
R
T
F
Parameter
Output Voltage Maximum (Clamp)
Output Voltage Low
Output Voltage High
Rising Time
Falling Time
Test Condition
V
CC
=20V
V
CC
=15V, I
O
=100mA
V
CC
=14V, I
O
=100mA
V
CC
=12V, C
L
=3nF,
20~80%
V
CC
=12V, C
L
=3nF,
80~20%
Min.
15.5
8
50
30
Typ.
16.5
Max.
17.5
1.4
Unit
V
V
V
80
40
160
70
ns
ns
Zero Current Detection Section
Symbol
V
ZCD
H
YS
of V
ZCD
V
ZCD-HIGH
V
ZCD-LOW
T
DEAD
T
RESTART
T
INHIB
V
DIS
T
ZCD-DIS
Parameter
Input Threshold Voltage Rising Edge
Threshold Voltage Hysteresis
Upper Clamp Voltage
Lower Clamp Voltage
Maximum Delay from ZCD to Output Turn-On
Restart Time
Disable Threshold
ZCD Disable Debounce Time
Test Condition
V
ZCD
Increasing
V
ZCD
Decreasing
I
ZCD
=3mA
I
ZCD
=-0.5mA
V
COMP
=5V, F
SW
=60KHz
Min.
1.9
0.25
8
0
100
Typ.
2.1
0.35
10
Max.
2.3
0.50
12
400
Unit
V
V
V
V
ns
µs
µs
mV
µs
Output Turned Off by ZCD 300
1.5
200
R
MOT
=24kΩ, ZCD=100mV 800
500
2.5
250
700
3.0
300
Inhibit Time (Maximum Switching Frequency Limit) R
MOT
=24kΩ
Maximum On-Time Section
Symbol
V
MOT
T
ON-MAX
Parameter
MOT Voltage
Maximum On-Time Programming (Resistor Based)
Test Condition
R
MOT
=24kΩ, V
CS
=0,
V
COMP
=5V
Min.
1.25
21
Typ.
1.30
25
Max.
1.35
27
Unit
V
µs
© System General Corp.
Version 1.3.1 (IRO33.0028.B6)
-5-
www.sg.com.tw • www.fairchildsemi.com
September 24, 2007
Microcontroller MCU
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