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 respon for low cost and component count. With preci inner resistor divider, preci 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 Load
ing 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 respon
∙ 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
APPLICATIONS Low Power AC/DC offline SMPS for ∙ Electrical Appliance ∙ Linear Regulator/RCC Replacement .
TYPICAL APPLICATION
DRAIN DRAIN
GND GND COMP CS
VDD ENB
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GENERAL INFORMATION
Pin Configuration
The pin map is shown as below for DIP8
CS
VDD
GND
DRAIN
ENB
DRAIN
GND
Ordering Information Part Number Description OB2223CP SOP8, Pb-free, Tube OB2223CPA SOP8, Pb-free, T&R OB2223AP DIP8, Pb-free, Tube
Package Dissipation Rating Package R θJA (℃/W) SOP8 90 DIP8 75
Note: Drain Pin Connected 100mm 2 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 ENB Voltage
-0.3 to 7V
Min/Max Operating
Junction Temperature T J -40 to 150 ℃
Min/Max Storage
Temperature T stg -55 to 150 ℃
Lead Temperature
(Soldering, 10cs)
260 ℃
Note: Stress beyond tho listed under “absolute
maximum ratings” may cau permanent damage to the device. The are stress ratings only, functi
onal operation of the device at the or any other conditions beyond tho 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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Marking Information
TERMINAL ASSIGNMENTS
Pin Num Pin Name I/O Description 1 VDD P Power Supply and Output Voltage Feedback 2 COMP I Compensation Pin. Connect a Cap to GND
国军抗日
3 ENB I
Connected to GND for 12V output 4 CS I Current n input
5/6 DRAIN O
梦见洪水淹没道路
HV MOSFET Drain Pin. The Drain pin is connected to the primary lead
of the transformer / inductance.
7/8 GND P Ground
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BLOCK DIAGRAM
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牛蒡茎叶l
ELECTRICAL CHARACTERISTICS
(T A = 25℃, VDD=16V, if not otherwi noted) Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
Supply Voltage (VDD) Section I DD ST
Standby Current
VDD=UVLO(off) -1V
3
10
uA
Operation supply current
CS=0V, VDD=12V
- 0.9 1.5 mA
I DD op Operation Current Operation supply current
CS=0V, VDD=12V, CL=0.5nF
1.2 1.7 mA
UVLO(ON) VDD Under Voltage Lockout
Enter
VDD falling
6.0
7.0
8.0 V UVLO(OFF) VDD Under Voltage Lockout
Exit
VDD rising
11.5
12.5
13.5 V
OVP Over voltage protection Threshold Ramp VDD until gate
shut down 23 25 27 V
Vpmos
Pull-up PMOS Active
蜡笔小新图
CS=0V,Comp=3V
10
V VDD Regulation Voltage In normal regulation, VDD will be regulated to 12.5V Ramp VDD until Comp
voltage lower than 2.5V
12.0 12.5 13
以诚相待
V黄河鲶鱼
Current Sen Input Section TLEB LEB time
200 ns
Vth_oc Over current threshold
890 925 960 mV Td_oc
OCP Propagation delay
炸面条的做法
100
ns
Z SENSE _IN Input Impedance
50 Kohm Frequency Section
Freq_Max Note 1 IC Maximum frequency 45
50 55 KHz △f/Freq Frequency shuffling range
+/-6
% F_shuffling Shuffling frequency
200
Hz
F_Burst
Burst Mode Switch
Frequency
22 KHZ
PWM Section
Dmax
Maximum Duty Cycle 50 % Vref_green
Threshold enter green mode
1.75 V Vref_burst_H Threshold exit burst mode
1.35 V Vref_burst_L Threshold enter burst mode 1.25 V Error Amplifier ction
Gain DC gain of EA
70 dB Gm
Trans-conductance of EA
110
uS
Protection Section O
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