High Performance PFC Controller
OB6561PX
GENERAL DESCRIPTION
OB6561PX is an active transition-mode (TM)
power factor correction (PFC) controller for AC-
DC switching mode power supply applications.
OB6561PX features a one quadrant multiplier with
THD optimizer for near unity power factor, zero
current detector (ZCD) to ensure TM operation, a
current sensing comparator with built-in leading-
edge blanking, and a totem pole output ideally
suited for driving a power MOSFET.
OB6561PX offers great protection coverage
including system over-voltage protection (OVP) to
eliminate runaway output voltage due to load
removal, VCC under voltage lockout (UVLO),
cycle-by-cycle current limiting, multiplier output
clamping that limit maximum peak switch current,
and gate drive output clamping for external power
MOSFET protection.
With added system open loop protection feature,
OB6561PX shuts down system when the
feedback loop is open.
FEATURES
Transition Mode (TM) Operation
One quadrant multiplier with THD optimizer
Low Start-up Current and Operating Current
Cycle-by-Cycle Current Limiting
Internal RC Filter
Under Voltage Lockout with Hysteresis
Very Precise Adjustable Output Overvoltage
Protection
Disable Function
Totem Pole Output with High State Clamping
System Open Loop Protection
Audio Noise Free
9.5V to 28V wide range of VCC voltage
APPLICATIONS
Electronic Ballast
AC-DC SMPS
TYPICAL APPLICATION
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_6561PX00
High Performance PFC Controller
OB6561PX
GENERAL INFORMATION
Terminal Assignment
In SOP8 or DIP8 Package.
INV
COMP
MULT
CS
1
2
3
4
8
7
6
5
VCC
GD
GND
ZCD
Ordering Information
Part Number
Description
OB6561PXAP
8 Pin DIP, Pb free in Tube
OB6561PXCP
8 Pin SOP, Pb free in Tube
OB6561PXCPA
8 Pin SOP, Pb free in T&R
Package Dissipation Rating
Package
RJA
(℃/W)
DIP8
90
SOP8
150
Absolute Maximum Ratings
Symbol
Parameter
DC Supply
VCC
voltage
Zero Current
I_ZCD
Detector Max.
Current
CS
INV
Analog inputs &
COMP
outputs
MULT
Min/Max
Operating
Tj
Junction
Temperature
Min/Max Storage
Tstg
Temperature
Lead
(Soldering,
Temperature
10secs)
Note:
Stresses beyond those listed
Value
30 V
50mA(source)
-10mA(sink)
-0.3 to 7V
-40 to 150
℃
-55 to 150
℃
260℃
under “absolute
maximum ratings” may cause permanent damage to the
device. These are stress ratings only, functional operation of
the device at these or any other conditions beyond those
indicated under “recommended operating conditions” is not
implied. Exposure to absolute maximum-rated conditions for
extended periods may affect device reliability.
©On-Bright Electronics
Confidential
-2-
Preliminary Datasheet
OB_DOC_DS_6561PX00
High Performance PFC Controller
OB6561PX
Marking Information
TERMINAL DESCRIPTIONS
Pin Num
1
2
3
4
5
6
7
8
Pin Name
INV
COMP
MULT
CS
ZCD
GND
GD
VCC
I/O
I
O
I
I
I
P
O
P
Description
Inverting Input of Error Amplifier. Connected to Resistor Divider from
System Output. This pin is also used for system open loop protection.
Output of Error Amplifier. A feedback compensation network is placed
between COMP and the INV pin.
Input of Multiplier. Connected to Line Voltage after Bridge Diodes via A
Resistor Divider to Provide Sinusoidal Reference Voltage to the Current
Loop.
Current Sense Input Pin. Connected to MOSFET Current Sensing Node.
Zero Current Detection Input. When Activated, A New Switching Cycle
Starts. If it is connected to GND, the device is disabled.
Ground Pin
Gate driver output. Drive Power MOSFET.
DC Supply Voltage.
©On-Bright Electronics
Confidential
-3-
Preliminary Datasheet
OB_DOC_DS_6561PX00
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