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OB2226
High Precision Low Cost MCM Power Switch
GENERAL DESCRIPTION
OB2226 is a high performance, high precision and
low cost PWM Power switch for non-isolated buck
application. It combines a dedicated current mode
PWM controller (with a high voltage power
MOSFET with DIP7 package) and built-in error
amplifier for low cost and component count. With
precise inner resistor divider, precise reference of
EA and load compensation, accurate constant
voltage regulation at universal AC input can be
guaranteed. For high efficiency, oscillator with
frequency-reduction control is implemented. And
EMI performance is achieved with On-Bright
proprietary frequency shuffling technique.
OB2226 offers power on soft start control and
protection coverage with auto-recovery features
including Cycle-by-Cycle current limiting, over
loading protection, output short-circuit protection,
over temperature protection, VDD OVP, and
UVLO.
OB2226 is offered in SOP8 or DIP7 package.
FEATURES
Low cost and component count buck
application
Built-in error amplifier
Load compensation
Oscillator of fixed frequency with frequency-
reduction control for high efficiency
Frequency shuffling for EMI improvement
Power on Soft-start
Built-in Leading Edge Blanking (LEB)
Cycle-by-Cycle Current Limiting
Over Loading Protection
Output Short-Circuit Protection
Over Temperature Protection
VDD Under Voltage Lockout with Hysteresis
(UVLO)
VDD OVP
APPLICATIONS
Low Power AC/DC offline SMPS for
Electrical Appliance
Linear Regulator/RCC Replacement
TYPICAL APPLICATION
AC IN
VDD
GND
COMP GND*
NC DRAIN
CS DRAIN
Note : GND* Only in SOP8 package
DC
OUT
©On-Bright Electronics
Confidential
-1-
Datasheet
OB_DOC_DS_2226A3

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GENERAL INFORMATION
Pin Configuration
The pin map is shown as below for SOP8 and
DIP7.
VDD 1
8 GND
COMP
2
7 GND
SOP8
NC 3
6 DRAIN
CS 4
5 DRAIN
VDD 1
7 GND
COMP
2
NC 3
DIP7
6 DRAIN
CS 4
5 DRAIN
OB2226
High Precision Low Cost MCM Power Switch
Ordering Information
Part Number
Description
OB2226SP
DIP7, Pb-free, Tube
OB2226CP
SOP8, Pb-free, Tube
OB2226CPA
SOP8, Pb-free, T&R
Package Dissipation Rating
Package
RθJA (/W)
DIP7
75
SOP8
90
Note: Drain Pin Connected 100mm2 PCB copper
clad.
Absolute Maximum Ratings
Parameter
Value
Drain Voltage (off state)
-0.3V to BVdss
VDD Voltage
-0.3 to 40V
VDD Zener Clamp
Continuous Current
10 mA
COMP Voltage
-0.3 to 7V
CS Input Voltage
-0.3 to 7V
Min/Max Operating
Junction Temperature TJ
Min/Max Storage
Temperature Tstg
Lead Temperature
(Soldering, 10secs)
-40 to 150
-55 to 150
260
Note: Stresses beyond those listed 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-
Datasheet
OB_DOC_DS_2226A3

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Marking Information
OB2226
High Precision Low Cost MCM Power Switch
TERMINAL ASSIGNMENTS
Pin Num
1
2
3
4
Pin Name
VDD
COMP
NC
CS
5/6 DRAIN
7/8 GND
I/O Description
P Power Supply
I Loop Compensation for CV Stability
I Not connected
I Current sense input
O
HV MOSFET Drain Pin. The Drain pin is connected to the primary lead
of the transformer / inductance.
P Ground
OUTPUT POWER TABLE
Product
OB2226SP
OB2226CP
90~300VAC
Buck topology, open frame
6.6W
4.0W
90~264VAC
Flyback topology, open frame
10W
6.0W
©On-Bright Electronics
Confidential
-3-
Datasheet
OB_DOC_DS_2226A3