OB2283MP电流模式PWM控制器-ob2283芯片中文资料_骊微电子.pdf
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1、OB2283 High Performance Current Mode PWM Controller GENERAL DESCRIPTION OB2283 is a highly integrated current mode PWM control IC optimized for high performance,low standby power and cost effective offline flyback converter applications.PWM switching frequency at normal operation is internally fixed
2、 and is 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.VCC low startup current and low operating current contribute to a reliable power on startup and lo
3、w standby design with OB2283.OB2283 offers comprehensive protection coverage with auto-recovery including Cycle-by-Cycle current limiting(OCP),over load protection(OLP),and VCC under voltage lockout(UVLO).It also provides the protections with latched shut down including over temperature protection(O
4、TP),and over voltage protection(OVP).Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling technique.The tone energy at below 25KHz is minimized in the design and audio noise is eliminated during operation.OB2283 is offered in SOT23-6 package.APPLICATIONS Offline AC/DC
5、 flyback converter for Printer,Storage power supplyPower AdapterFEATURES Power on soft start reducing MOSFET VdsstressFrequency shuffling for EMIExtended burst mode control for improvedefficiency and low standby power designAudio noise free operationPeak load operation with increased frequencyCompre
6、hensive protection coverageoVCC Under Voltage Lockout withhysteresis(UVLO)oVCC Over Voltage Protection(VCC OVP)oCycle-by-cycle over current thresholdsetting for constant output power limitingover universal input voltage rangeoOver Load Protection(OLP)with auto-recoveryoExternal(if NTC resistor is co
7、nnected atPRT pin)or internal Over TemperatureProtection(OTP)with latched shut downoOutput Over Voltage Protection(OutputOVP)with latched shut down,and theOVP triggered voltage can be adjusted bythe resistor connected between auxiliarywinding and PRT pinoOutput diode short protection with auto-recov
8、eryoGND open protection with auto-recoveryTYPICAL APPLICATION EMIFilterAC INDC OutOB2283VCCGNDGATEFB1236CS45 PRTVauxOB2283 High Performance Current Mode PWM Controller GENERAL INFORMATION Pin Configuration PRTVCCFBCSGate123456GNDOrdering Information Part Number Description OB2283MP SOT23-6,Pb-free i
9、n T&R Package Dissipation Rating Package R JA(/W)SOT23-6200Recommended operating condition Symbol Parameter Range VCC VCC Supply Voltage 12 to 28V TA Operating Ambient Temperature-20 to 85 Absolute Maximum Ratings Parameter Value VCC DC Supply Voltage VOVP-1V FB Input Voltage-0.3 to 7VCS Input Volta
10、ge-0.3 to 7VPRT Input Voltage -0.3 to 7VMin/Max Operating Junction Temperature TJ-40 to 150 Min/Max Storage Temperature Tstg-55 to 150 LeadTemperature(Soldering,10secs)260 Note:Stresses beyond those listed under“absolutemaximum ratings”may cause permanent damage to the device.These are stress rating
11、s 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.OB2283 X X High Performance Current Mode PWM Contro
12、ller PackageM:SOT23-6Package Pb-freeP:Pb-freeMarking Information 83YWW.ZZZSY:Year CodeWW:Week Code(01-52)s:Internal codeZZZ:Lot code OB2283 High Performance Current Mode PWM Controller TERMINAL ASSIGNMENTS Pin Name I/O Description VCCP Power SupplyCS I Current sense input Gate O Totem-pole gate driv
13、er output for power MOSFET GNDP GroundPRTI Dual functions pin.Connecting a NTC resistor to ground for OTP detection.Connecting a resistor from Vaux can adjust OVP trigger voltage.If both OTP and OVP are needed,a diode should be connected between PRT pin and the NTC resistor.FBI Feedback input pin.Th
14、e PWM duty cycle is determined by voltage level into this pin and the current-sense signal at Pin CS.OB2283 High Performance Current Mode PWM Controller FUNCTIONAL BLOCK DIAGRAM OLPPWM ComparatorOSCRSQSlope compensationAVDDVocpLEBSoft Driver LogicControlTimerPK/Green/BurstUVLOVref&IrefAVDDInternal b
15、locksOLPOCP ComparatorLatchOVPOVPOVPTemp senseEX OTPEX OVPOTPGND openDiode shortDiode shortDiode shortOB2283 High Performance Current Mode PWM Controller ELECTRICAL CHARACTERISTICS(TA=25,VCC=18V,unless otherwise noted)Symbol Parameter Test Conditions Min Typ MaxUnit Supply Voltage(VDD)Istartup VCC S
16、tart up Current VCC=UVLO(OFF)-1V,measure leakage current into VCC 3 10 uA I_VCC_Operation Operation Current VDD=18V,CS=4V,FB=3.5V,measure I(VCC)2.5 3 mA I_VCC_Burst Burst Current CS=0V,FB=0.5V,measure I(VCC)0.55 0.65mA UVLO(ON)VCC Under Voltage Lockout Enter 7 8 9VUVLO(OFF)VCC Under Voltage Lockout
17、Exit(Recovery)19 21 23VVpull-up Pull-up PMOS active 10 V OVP VCC Over Voltage Protection threshold voltage FB=3V,CS=0V.Slowly ramp VCC,until no gate switching.29 30 31 V Vlatch_release Latch release voltage 5 V Feedback Input Section(FB Pin)VFB_OpenVFB Open Loop Voltage 5.1 V Avcs PWM input gain VFB
18、/VCS3.5 V/V Maximum duty cycle Max duty cycle VCC=18V,VFB=3V,VCS=0V 75 78 81%Vref_green The threshold enter green mode1.85 V Vref_burst_H The threshold exits burst mode1.33 V Vref_burst_L The threshold entersburst mode 1.23 VIFB_Short FB pin short circuit current Short FB pin to GND and measure curr
19、ent 0.3 mA VTH_OLP Open loop protection,FB Threshold Voltage 4.4 VTd_OLP Open loop protection,Debounce Time 15 msZFB_INInput Impedance 16 KohmCurrent Sense Input(CS Pin)SST_CS Soft start time for CS peak 4 ms T_blanking Leading edge blanking time 250 ns Td_OC Over Current Detection and Control Delay
20、 From Over Current Occurs till the Gatedriver output start to turn off 90 ns VTH_OC Internal Current Limiting Threshold Voltage with zero duty cycle 0.43 0.45 0.47VVTH_OC_Clamp OCP CS voltage clamper 0.69 V Vdiode_scp Diode short protection voltage 1.4 V Td_dio Diode short debounce time 8 CyclesOB22
21、83 High Performance Current Mode PWM Controller Vgnd_open GND open protection voltage difference between GND and CS 0.3 VTd_gnd_open GND open protectiondebounce time 20 usTd_OCP Over Current protection debounce Time 60 msPRT pin IRT Output current for external OTP detection 95 100 105uAVOTP Threshol
22、d voltage for externalOTP 0.95 1 1.05VTd_OTP External OTP debounce time 5 CyclesIoutput_ovp Current threshold for adjustable output OVP 70 uATd_output_ovp Output OVP debounce time 5 CyclesIn-chip OTP OTP enter 150 OTP exit 120 Oscillator FOSC Normal Oscillation Frequency VDD=18V,FB=3V,CS=0V 60 65 70
23、 KHz Fosc_PKPeak frequencyVDD=18V,FB=4.5V,CS=0V 142 KHz SST_freq Soft start time of frequency 30 ms f_OSCFrequency jittering+/-6%F_shufflingShuffling frequency 32 Hzf_TempFrequencyTemperatureStability 1%f_VCCFrequency Voltage Stability 1%F_Burst Burst Mode Switch Frequency 25 KHz Gate driver VOL Out
24、put low level VDD=18V,Io=5mA 1VVOH Output high level VCC=18V,Io=20mA 6 VV_clamping Output clamp voltage 12 V T_r Output rising time 1.2V 10.8V CL=1000pF 160 nsT_f Output falling time 10.8V 1.2V CL=1000pF 50 nsOB2283 High Performance Current Mode PWM Controller CHARACTERIZATION PLOTS VDD=18V,TA=25 co
25、ndition applies if not otherwise noted.UVLO_ON vs Temperature77.27.47.67.88-40-10205080110140Temperature()UVLO _O N(V)UVLO_OFF vs Temperature2020.220.420.620.821-40-10205080110140Temperature()UVLO _O FF(V)Fosc vs Temperature606264666870-40-10205080110140Temperature()Fosc(KHz)Ton_comp vs Temperature7
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