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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
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Datasheet
OB_DOC_DS_2226A3

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BLOCK DIAGRAM
OVP
OB2226
High Precision Low Cost MCM Power Switch
©On-Bright Electronics
Confidential
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Datasheet
OB_DOC_DS_2226A3

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OB2226
High Precision Low Cost MCM Power Switch
ELECTRICAL CHARACTERISTICS
(TA = 25, VDD=16V, if not otherwise noted)
Symbol
Parameter
Test Conditions
Min
Supply Voltage (VDD) Section
I DD ST
Standby Current
VDD=13V
I DD op
Operation Current
Operation supply current
CS=0V,
-
VDD=18V
UVLO(ON)
VDD Under Voltage Lockout
Enter
VDD falling
8.2
UVLO(OFF)
VDD Under Voltage Lockout
Exit
VDD rising
13.5
OVP
Over voltage protection Ramp VDD until gate
Threshold
shut down
26
VDD Regulation
Voltage
In normal regulation, VDD
will be regulated to 19.3V
Ramp VDD until Comp
voltage lower than 2.5V
18.6
Current Sense Input Section
TLEB
LEB time
Vth_oc
Over current threshold
910
Td_oc
OCP propagation delay
ZSENSE_IN
Input Impedance
Frequency Section
50
Freq_Max
IC Maximum frequency
40
f/Freq
Frequency shuffling range
Error Amplifier Section
Gain
DC gain of EA
I_COMP_MAX
Max. Cable compensation
current
VDD=18V, Comp=0V
Protection
VTH_OLP
Over loading protection
threshold voltage
Td_OLP
OTP enter
Over load, debounce Time
OTP exit
Power MOSFET Section
BVdss
MOSFET
Drain-Source
Breakdown Voltage
600
Rdson
On Resistance(DIP7)
On Resistance(SOP8)
Static, Id=0.45A
Static, Id=0.45A
Typ Max
5 20
1.5 2.5
9.0 10.5
14.8 16.0
27.5 29
19.3 20.0
200
940 970
110
45 50
+/-6
60
3.3
4
100
150
130
15
15
Unit
uA
mA
V
V
V
V
ns
mV
ns
Kohm
KHz
%
dB
uA
V
ms
V
Ώ
Ώ
©On-Bright Electronics
Confidential
-5-
Datasheet
OB_DOC_DS_2226A3