High Precision Low Cost MCM Power Switch
OB2223
GENERAL DESCRIPTION
OB2223 is a high performance, high precision and
low cost PWM Power switch for Non-isolated
buck/ buck-boost and flyback application. It
combines a dedicated current mode PWM
controller (with a high voltage power MOSFET
with SOP8/DIP8 package) and built-in error
amplifier optimized for good overshoot and
dynamic response for low cost and component
count. With precise inner resistor divider, precise
reference of EA
，
accurate constant voltage
regulation 12V at universal AC input can be
guaranteed. For high efficiency, oscillator with
frequency-reduction and burst mode control is
implemented. And EMI performance is achieved
with On-Bright proprietary frequency shuffling
technique and soft gate driver design.
OB2223 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, On-Chip OTP,VDD OVP, and UVLO.
OB2223 is offered in SOP8/DIP8 package
FEATURES
Low cost and component count buck
application
Current Mode Control
Multiple mode control with good dynamic
response
Oscillator of fixed maximum switching
frequency with frequency-reduction and burst
mode 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
VDD Under Voltage Lockout with Hysteresis
(UVLO)
VDD OVP
On-Chip OTP
TYPICAL APPLICATION
ht
C
ig
Br
on
fid
VDD
COMP
ENB
CS
en
GND
GND
DRAIN
DRAIN
APPLICATIONS
Low Power AC/DC offline SMPS for
Electrical Appliance
Linear Regulator/RCC Replacement
.
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简
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AC IN
©On-Bright Electronics
Confidential
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OB_DOC_DS_2223A0
氏
DC
OUT
High Precision Low Cost MCM Power Switch
OB2223
GENERAL INFORMATION
Pin Configuration
The pin map is shown as below for DIP8
Package Dissipation Rating
Package
RθJA (℃/W)
SOP8
90
DIP8
75
Note:
Drain Pin Connected 100mm
2
PCB copper
clad.
Absolute Maximum Ratings
Parameter
Drain Voltage (off state)
VDD Voltage
VDD Zener Clamp
Continuous Current
COMP Voltage
CS Input Voltage
ENB Voltage
Min/Max Operating
Junction Temperature T
J
Min/Max Storage
Temperature T
stg
Lead Temperature
(Soldering, 10secs)
Note:
Stresses beyond those
Value
-0.3V to Bvdss
-0.3 to 40V
10 mA
-0.3 to 7V
-0.3 to 7V
-0.3 to 7V
-40 to 150
℃
-55 to 150
℃
260
℃
VDD
1
8
GND
COMP
2
7
GND
ENB
3
6
DRAIN
O
n-
©On-Bright Electronics
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ig
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C
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Ordering Information
Part Number
Description
OB2223CP
SOP8, Pb-free, Tube
OB2223CPA
SOP8, Pb-free, T&R
OB2223AP
DIP8, Pb-free, Tube
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.
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CS
4
5
DRAIN
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OB_DOC_DS_2223A0
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High Precision Low Cost MCM Power Switch
OB2223
Marking Information
TERMINAL ASSIGNMENTS
Pin Num
1
2
3
4
5/6
7/8
Pin Name
VDD
COMP
ENB
CS
DRAIN
GND
I/O
P
I
I
I
O
P
Connected to GND for 12V output
O
n-
©On-Bright Electronics
Br
ig
ht
C
on
Current sense input
HV MOSFET Drain Pin. The Drain pin is connected to the primary lead
of the transformer / inductance.
Ground
fid
Confidential
-3-
en
Description
Power Supply and Output Voltage Feedback
Compensation Pin. Connect a Cap to GND
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OB_DOC_DS_2223A0
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High Precision Low Cost MCM Power Switch
OB2223
ELECTRICAL CHARACTERISTICS
(T
A
= 25℃, VDD=16V, if not otherwise noted)
Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
Supply Voltage (VDD) Section
I
DD ST
Standby Current
VDD=UVLO(off) -1V
Operation supply current
-
CS=0V, VDD=12V
I
DD op
Operation Current
Operation supply current
CS=0V, VDD=12V,
CL=0.5nF
6.0
11.5
23
3
0.9
1.2
10
1.5
uA
mA
UVLO(ON)
UVLO(OFF)
OVP
Vpmos
Over voltage
Threshold
protection Ramp VDD until gate
shut down
CS=0V,Comp=3V
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890
50
45
VDD Under Voltage Lockout
VDD rising
Exit
o
25
10
200
925
100
50
200
22
50
70
110
VDD Under Voltage Lockout
VDD falling
Enter
简
7.0
12.5
12.5
+/-6
1.75
1.35
1.25
Pull-up PMOS Active
VDD Regulation In normal regulation, VDD Ramp VDD until Comp
12.0
Voltage
will be regulated to 12.5V
voltage lower than 2.5V
TLEB
Vth_oc
Td_oc
Z
SENSE
_IN
Freq_Max
Note 1
△f/Freq
F_shuffling
F_Burst
LEB time
Over current threshold
Input Impedance
en
fid
Current Sense Input Section
OCP Propagation delay
on
Frequency Section
Frequency shuffling range
ht
IC Maximum frequency
Shuffling frequency
Switch
C
ig
PWM Section
Dmax
n-
Br
Burst
Mode
Frequency
Maximum Duty Cycle
Threshold enter green
mode
Threshold exit burst mode
Threshold enter burst mode
DC gain of EA
Trans-conductance of EA
氏
1.7
8.0
13.5
27
13
960
55
mA
V
V
V
V
V
ns
mV
ns
Kohm
KHz
%
Hz
KHZ
%
V
V
V
dB
uS
O
Gain
Gm
Vref_green
Vref_burst_H
Vref_burst_L
Error Amplifier section
Protection Section
©On-Bright Electronics
Confidential
-5-
OB_DOC_DS_2223A0
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