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OB2223 Datasheet


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

APPLICATIONS
Low Power AC/DC offline SMPS for ? Electrical Appliance ? Linear Regulator/RCC Replacement .

TYPICAL APPLICATION

VDD COMP ENB CS

GND GND DRAIN DRAIN

AC IN

DC OUT

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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 100mm2 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 TJ Min/Max Storage Temperature Tstg 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

CS

4

5

DRAIN

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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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 Description Power Supply and Output Voltage Feedback Compensation Pin. Connect a Cap to GND
Connected to GND for 12V output

Current sense input HV MOSFET Drain Pin. The Drain pin is connected to the primary lead of the transformer / inductance. Ground

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High Precision Low Cost MCM Power Switch

OB2223

BLOCK DIAGRAM

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OB2223

ELECTRICAL CHARACTERISTICS
(TA = 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 7.0 12.5 25 10 12.5 13 10 1.5 1.7 8.0 13.5 27 uA mA mA V V V V V

UVLO(ON) UVLO(OFF) OVP Vpmos

VDD Under Voltage Lockout VDD falling Enter VDD Under Voltage Lockout VDD rising Exit Over voltage Threshold protection Ramp VDD until gate shut down CS=0V,Comp=3V

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 Current Sense Input Section TLEB Vth_oc Td_oc ZSENSE_IN Freq_MaxNote 1 △f/Freq F_shuffling F_Burst PWM Section Dmax Vref_green Vref_burst_H Vref_burst_L Gain Gm Maximum Duty Cycle Threshold enter green mode Threshold exit burst mode Threshold enter burst mode DC gain of EA Trans-conductance of EA LEB time Over current threshold OCP Propagation delay Input Impedance IC Maximum frequency Frequency shuffling range Shuffling frequency Burst Mode Frequency Switch 50 45 890

200 925 100 960

ns mV ns Kohm

Frequency Section 50 +/-6 200 22 55 KHz % Hz KHZ

50 1.75 1.35 1.25 70 110

% V V V dB uS

Error Amplifier section

Protection Section
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High Precision Low Cost MCM Power Switch

OB2223

Vth_OLP Debounce Time

Over loading protection Frequency=50Khz Exit Over temperature protection Enter Over temperature protection MOSFET Drain-Source Breakdown Voltage On Resistance(DIP8) On Resistance(SOP8) Static, Id=0.45A Static, Id=0.45A 66

3.6 71 105 135 76

V mS ℃ ℃

OTP

Power MOSFET Section BVdss Rdson 600 15 25 V ? ?

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OB2223

CHARACTERIZATION PLOTS
UVLO(ON) vs Temperature

UVLO(OFF) vs Temperature 13.5 13.3 13.1 12.9 12.7 12.5 -40 -10 20 50 80 110 140

UVLO(ON)(V)

7.4 7.3 7.2 7.1 7 -40 -10 20 50 80 110 140

UVLO(OFF) (V)

7.5

Temperature(℃)

Temperature( ℃) I_startup vs Temperature 15 12 I_startup(uA) 9 6 3 0 -40 -10 20 50 80 110 140

F_max vs Temperature 52 F_max(KHz) 51 50 49 48 47 -40 -10 20 50 80 Temperature(℃)
Vth_oc vs Temp 925 Vth_oc(mV) 924 923 922 921 920 -40 -10 20 50 80 110 140

110 140

Temperature( ℃ )

Temperature(℃)

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High Precision Low Cost MCM Power Switch

OB2223

OPERATION DESCRIPTION
OB2223 is a cost effective PWM power switch optimized for off-line Non-isolated buck/ buckboost and flyback applications including electrical appliance and linear regulator replacement. It operates in current mode and regulates output voltage with dedicated features. High integration can afford low cost and component count solution. z Startup Current and Start up Control Startup current of OB2223 is designed to be very low so that VDD could be charged up above UVLO threshold and starts up quickly. A large value startup resistor can therefore be used to minimize the power loss in application. z Operating Current The Operating current of OB2223 is as low as 1.2mA. Good efficiency is achieved with the low operating current together with ‘Multi-mode’ control features. z Oscillator operation The maximum switching frequency of OB2223 is internally fixed at 50KHZ. No external frequency setting components are required for PCB design simplification. At light load or zero load condition, most of the power dissipation in a switching mode power supply is from switching loss on the MOSFET. The magnitude of power loss is in proportion to the switching frequency. Lower switching frequency leads to the reduction on the power loss and thus conserves the energy. The frequency reduction and burst mode is implemented depends on loading condition. The minimum switching frequency is 22KHz. z Frequency shuffling for EMI improvement The frequency shuffling (switching frequency modulation) is implemented in OB2223. The oscillation frequency is modulated so that the tone energy is spread out. The spread spectrum minimizes the conduction band EMI and therefore eases the system design. Multiple mode control with good dynamic response In OB2223, the On-Bright proprietary on-chip EA (error amplifier) is implemented to regulate output voltage in either ON/OFF control mode or integration control mode. Through precise inner resistor divider and proprietary control network, the VDD voltage is detected at EA to regulate output voltage and achieve great stability and dynamic response. z Current Sensing and Leading Edge Blanking Cycle-by-Cycle current limiting is offered in OB2223 current mode PWM control. The switch current is detected by a sense resistor into the CS pin. An internal leading edge blanking circuit chops off the sensed voltage spike at initial internal power MOSFET on state so that the external RC filtering on sense input is no longer needed. The PWM duty cycle is determined by the current sense input voltage and the EA output voltage. z z Gate Drive The internal power MOSFET in OB2223 is driven by a dedicated gate driver for power switch control. Too weak the gate drive strength results in higher conduction and switch loss of MOSFET while too strong gate drive compromises EMI. A good tradeoff is achieved through the built-in totem pole gate design with right output strength control. z Protection Control Good power supply system reliability is achieved with its rich protection features including Cycle-byCycle current limiting (OCP), Over Loading Protection, Over Voltage Protection, Over Temperature Protection, Output Short-Circuit Protection and Under Voltage Lockout on VDD (UVLO).

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High Precision Low Cost MCM Power Switch

OB2223

PACKAGE MECHANICAL DATA

Symbol A A1 A2 b c D E E1 e L θ

Dimensions In Millimeters Min Max 1.350 1.750 0.050 0.250 1.250 1.650 0.310 0.510 0.170 0.250 4.700 5.150 3.800 4.000 5.800 6.200 1.270 (BSC) 0.400 1.270 0? 8?

Dimensions In Inches Min Min 0.053 0.069 0.002 0.010 0.049 0.065 0.012 0.020 0.006 0.010 0.185 0.203 0.150 0.157 0.228 0.244 0.05 (BSC) 0.016 0.050 0? 8?

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High Precision Low Cost MCM Power Switch

OB2223

Symbol A A1 A2 B B1 C D E E1 e L E2

Dimensions In Millimeters Min Max 3.710 5.334 0.381 2.921 4.953 0.350 0.650 1.524 (BSC) 0.200 0.360 9.000 10.160 6.096 7.112 7.320 8.255 2.540 (BSC) 2.921 3.810 7.620 10.920

Dimensions In Inches Min Max 0.146 0.210 0.015 0.115 0.195 0.014 0.026 0.06 (BSC) 0.008 0.014 0.354 0.400 0.240 0.280 0.288 0.325 0.1 (BSC) 0.115 0.150 0.300 0.430

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High Precision Low Cost MCM Power Switch

OB2223

IMPORTANT NOTICE
RIGHT TO MAKE CHANGES On-Bright Electronics Corp. reserves the right to make corrections, modifications, enhancements, improvements and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. WARRANTY INFORMATION On-Bright Electronics Corp. warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with its standard warranty. Testing and other quality control techniques are used to the extent it deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. On-Bright Electronics Corp. assumes no liability for application assistance or customer product design. Customers are responsible for their products and applications using On-Bright’s components, data sheet and application notes. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. LIFE SUPPORT On-Bright Electronics Corp.’s products are not designed to be used as components in devices intended to support or sustain human life. On-bright Electronics Corp. will not be held liable for any damages or claims resulting from the use of its products in medical applications. MILITARY On-Bright Electronics Corp.’s products are not designed for use in military applications. On-Bright Electronics Corp. will not be held liable for any damages or claims resulting from the use of its products in military applications.

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