1、 On-Bright Electronics -1-OB_DOC_DS_63B5 OB2263Current Mode PWM ControllerFrequency ShufflingGENERAL DESCRIPTION OB2263 is a highly integrated current mode PWM control IC optimized for high performance,low standby power and cost effective offline flyback converter applications in sub 30W range.PWM s
2、witching frequency at normal operation is externally programmable and trimmed to tight range.At no load or light load condition,the IC operates in extended burst mode to minimize switching loss.Lower standby power and higher conversion efficiency is thus achieved.VDD low startup current and low oper
3、ating current contribute to a reliable power on startup design with OB2263.A large value resistor could thus be used in the startup circuit to minimize the standby power.The internal slope compensation improves system large signal stability and reduces the possible sub-harmonic oscillation at high P
4、WM duty cycle output.Leading-edge blanking on current sense(CS)input removes the signal glitch due to snubber circuit diode reverse recovery and thus greatly reduces the external component count and system cost in the design.OB2263 offers complete protection coverage with automatic self-recovery fea
5、ture including Cycle-by-Cycle current limiting(OCP),over load protection(OLP),VDD over voltage clamp and under voltage lockout(UVLO).The Gate-drive output is clamped to maximum 18V to protect the power MOSFET.Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling techni
6、que together with soft switching control at the totem pole gate drive output.Tone energy at below 20KHZ is minimized in the design and audio noise is eliminated during operation.OB2263 is offered in SOT23-6,SOP-8 and DIP-8 packages.FEATURES On-Bright Proprietary Frequency Shuffling Technology for Im
7、proved EMI Performance.Extended Burst Mode Control For Improved Efficiency and Minimum Standby Power Design Audio Noise Free Operation External Programmable PWM Switching Frequency Internal Synchronized Slope Compensation Low VDD Startup Current and Low Operating Current(1.4mA)Leading Edge Blanking
8、on Current Sense Input Good Protection Coverage With Auto Self-Recovery o VDD Over Voltage Clamp and Under Voltage Lockout with Hysteresis(UVLO)o Gate Output Maximum Voltage Clamp(18V)o On-Bright Proprietary Line Input Compensated Cycle-by-Cycle Over-current Threshold Setting For Constant Output Pow
9、er Limiting Over Universal Input Voltage Range.o Overload Protection(OLP)APPLICATIONS Offline AC/DC flyback converter for Battery Charger Power Adaptor Set-Top Box Power Supplies Open-frame SMPS TYPICAL APPLICATION Confidential to Micro Bridge On-Bright Electronics -2-OB_DOC_DS_63B5 OB2263Current Mo
10、de PWM ControllerFrequency Shuffling GENERAL INFORMATION Pin Configuration The OB2263 is offered in SOT23-6,DIP8 and SOP8 packages,shown as below.Ordering Information Part Number Description OB2263MP SOT23-6,Pb-free OB2263AP DIP8,Pb-free OB2263CP SOP8,Pb-free Package Dissipation Rating Package RJA(C
11、/W)DIP8 90 SOP8 150 SOT23-6 200 Absolute Maximum Ratings Parameter Value VDD DC Supply Voltage 30 V VDD Zener Clamp VoltageNote VDD_Clamp+0.1VVDD DC Clamp Current 10 mA VFB Input Voltage -0.3 to 7V VSENSE Input Voltage to Sense Pin-0.3 to 7V VRI Input Voltage to RI Pin-0.3 to 7V Min/Max Operating Ju
12、nction Temperature TJ-20 to 150 oC Min/Max Storage Temperature Tstg-55 to 160 oC Note:#VDD_Clamp has a nominal value of 34V.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 o
13、r 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.Confidential to Micro Bridge On-Bright Electronics -3-OB_DOC_DS_63B5 OB2263Current Mode PWM ControllerF
14、requency Shuffling Marking Information TERMINAL ASSIGNMENTS Pin Name I/O Description GND P Ground FB I Feedback input pin.The PWM duty cycle is determined by voltage level into this pin and SENSE pin input.RI I Internal Oscillator frequency setting pin.A resistor connected between RI and GND sets th
15、e PWM frequency.SENSE I Current sense input pin.Connected to MOSFET current sensing resistor node.VDD P Chip DC power supply pin.GATE O Totem-pole gate drive output for the power MOSFET.RECOMMENDED OPERATING CONDITION Symbol Parameter Min Max Unit VDD VDD Supply Voltage 10 to 30 V RI RI Resistor Val
16、ue 100 Kohm TA Operating Ambient Temperature-20 to 85 oC Confidential to Micro Bridge On-Bright Electronics -4-OB_DOC_DS_63B5 OB2263Current Mode PWM ControllerFrequency ShufflingBLOCK DIAGRAM Confidential to Micro Bridge On-Bright Electronics -5-OB_DOC_DS_63B5 OB2263Current Mode PWM ControllerFrequency ShufflingELECTRICAL CHARACTERISTICS(TA=25OC if not otherwise noted)Symbol Parameter Test Conditions Min Typ Max Unit Supply Voltage(VDD)I_VDD_Startup VDD Start up Current VDD=12.5V,RI=100K Measure
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