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Power factor corrector - STMicroelectronics

L4981AL4981 BPOWER factor CORRECTORCONTROL boost PWM UP TO LINE CURRENT DISTORTION TO < 5%UNIVERSAL INPUT MAINSFEED FORWARD LINE AND LOAD REGULA-TIONAVERAGE CURRENT MODE PWM FORMINIMUM NOISE SENSITIVITYHIGH CURRENT BIPOLAR AND DMOS TO-TEM POLE OUTPUTLOW START-UP CURRENT ( TYP.)UNDER VOLTAGE LOCKOUT WITH HYS-TERESIS AND PROGRAMMABLE TURN ONTHRESHOLDOVERVOLTAGE, OVERCURRENT PROTEC-TIONPRECISE 2% ON CHIP REFERENCE EX-TERNALLY AVAILABLESOFT STARTDESCRIPTIONThe L4981 provides the necessary featuresto achieve a very high Power factor up to in BCD 60II technology this Power factorcorrector (PFC) pre-regulator contains all the con-trol functions for designing a high efficiency-modepower supply with sinusoidal line current con-sumption.

power factor corrector control boost pwm up to 0.99p.f. limit line current distortion to < 5% universal input mains feed forward line and load regula-tion average current mode pwm for minimum noise sensitivity high current bipolar and dmos to-tem pole output low start-up current (0.3ma typ.) under voltage lockout with hys-teresis and ...

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Transcription of Power factor corrector - STMicroelectronics

1 L4981AL4981 BPOWER factor CORRECTORCONTROL boost PWM UP TO LINE CURRENT DISTORTION TO < 5%UNIVERSAL INPUT MAINSFEED FORWARD LINE AND LOAD REGULA-TIONAVERAGE CURRENT MODE PWM FORMINIMUM NOISE SENSITIVITYHIGH CURRENT BIPOLAR AND DMOS TO-TEM POLE OUTPUTLOW START-UP CURRENT ( TYP.)UNDER VOLTAGE LOCKOUT WITH HYS-TERESIS AND PROGRAMMABLE TURN ONTHRESHOLDOVERVOLTAGE, OVERCURRENT PROTEC-TIONPRECISE 2% ON CHIP REFERENCE EX-TERNALLY AVAILABLESOFT STARTDESCRIPTIONThe L4981 provides the necessary featuresto achieve a very high Power factor up to in BCD 60II technology this Power factorcorrector (PFC) pre-regulator contains all the con-trol functions for designing a high efficiency-modepower supply with sinusoidal line current con-sumption.

2 The L4981 can be easily used in systems withmains voltages between 85V to 265V without anyline switch. This new PFC offers the possibility towork at fixed frequency (L4981A) or modulatedfrequency (L4981B) optimizing the size of the in-November 2001 BLOCK DIAGRAMORDERING NUMBERS: L4981X (DIP20) L4981XD (SO20)DIP20SO20 MULTIPOWER BCD TECHNOLOGY1/16put filter; both the operating frequency modesworking with an average current mode PWM con-troller, maintaining sinusoidal line current withoutslope Power MOSFET gate driver, precise volt-age reference (externally available), error ampli-fier, undervoltage lockout, current sense and thesoft start are included.

3 To limit the number of theexternal components, the device integrates pro-tections as overvoltage and overcurrent. Theovercurrent level can be programmed using asimple resistor for L4981A. For a better precisionand for L4981B an external divider must be MAXIMUM RATINGSS ymbolPinParameterValueUnitVCC19 Supply Voltage (ICC 50mA) (*)selflimitVIGDRV20 Gate driv. output peak current (t = 1 s) SINK2 . driv. output voltage t = s-1 VVoltages at pins 3, 14, 7, 6, 12, to 9 VVVA-OUT13 Error Amplifier Voltage to Input Current5mAVoltages at pin 8, to 7 VVCA-OUT5 Current Amplifier Volt.

4 (Isource = -20mA; Isink = 20mA) to at pin to 3V11, 18 Voltage at pin 11, to 7 VICOSC18 Input Sink Current15mAIFREQ-MOD16 Frequency Modulation Sink Current (L4981B)5mAVSYNC16 Sync. Voltage (L4981A) to 7 VVIPK2 Voltage at pin 2 Voltage at Pin 2 t = 1 to Dissipation at Tamb = 70 C (DIP20)1 WPower Dissipation at Tamb = 70 C (SO20) Ambient Temperature-40 to 125 CTstgStorageTemperature-55 to 150 C(*) Maximum package Power dissipation limits must be CONNECTIONS (Top views)L4981AL4981BL4981A - L4981B2/16 THERMAL DATAS ymbolParameterDIP 20SO 20 UnitRth j-ambThermal Resistance Junction-ambient 80120 C/WPIN peak current limiting.

5 A current limitation is obtained using a single resistor connectedbetween Pin 2 and the sense resistor. To have a better precision another resistor between Pin2 and a reference voltage (Pin 11) must be peak current limiting. A precise current limitation is obtained using two externalresistor only. These resistors must be connected between the sense resistor, Pin 2 and thereference protection. At this input are compared an internal precise (typ) voltagereference with a sample of the boost output voltage obtained via a resistive voltage divider inorder to limit the maximum output peak for the AC current. An input current proportional to the rectified mains voltage generates,via a multiplier, the current reference for the current amplifier output.

6 An external RC network determinates the loop feedforward; this voltage input pin allows to modify the multiplier output currentproportionally to the load, in order to give a faster response versus load transient. The bestcontrol is obtained working between and If this function is not used, connect this pinto the voltage reference (pin = 11).7 VRMSI nput for proportional RMS line voltage. the VRMS input compesates the line voltage a low pass filter between the rectified line and the pin 7, a DC voltage proportionalto the input line RMS voltage is obtained. The best control is reached using input voltagebetween and If this function is not used connect this pin to the voltage reference(pin = 11).

7 8 MULT-OUTM ultiplier output. This pin common to the multiplier output and the current amplifier input isan high impedence input like ISENSE. The MULT-OUT pin must be taken not below amplifier inverting input. Care must be taken to avoid this pin goes down reference voltage (typ = ).Voltage refence at 2% of accuracy externally available,it s internally current limited and can deliver an output current up to capacitor connected to ground defines the soft start time. An internal current generatordelivering 100 A (typ) charges the external capacitor defining the soft start time constant. Aninternal MOS discharge, the external soft start capacitor both in overvoltage and amplifier output, an RC network fixes the voltage loop gain error amplifier inverting input.

8 This feedback input is connected via a voltage divider tothe boost output under voltage lock out threshold input. A voltage divider between supplyvoltage and GND can be connected in order to program the turn on (L4981A)This synchronization input/output pin is CMOS logic compatible. Operating as SYNC in, arectangular wave must be applied at this pin. Opearting as SYNC out, a rectangular clockpulse train is available to synchronize other (L4981B)Frequency modulation current input. An external resistor must be connected between pin 16and the rectified line voltage in order to modulate the oscillator frequency. Connecting pin 16 toground a fixed frequency imposed by ROSC and COSC is external resistor connected to ground fixes the constant charging current of external capacitor connected to GND fixes the switching input gate driver.

9 Bipolar and DMOS transistors totem pole output stage can deliver peakcurrent in excess 1A useful to drive MOSFET or IGBT Power - L4981B3/16 ELECTRICAL CHARACTERISTICS (Unless otherwise specified VCC = 18V, COSC = 1nF, ROSC = 24K , CSS = 1 F, VCA-OUT = , VISENSE = 0V, VLFF = VREF, IAC = 100 A, VRMS = 1V,VFEED = GND, VIPK = 1V, VOVP = 1V, TJ = 25 CSymbolPrameterTest AMPLIFIER SECTIONVIOI nput Offset Voltage 25 C < TJ < 85 C 8mVIIBI nput Bias CurrentVFEED = 0V-500-50500nAOpen Loop Gain70100dBV13 HOutput High voltageVFEED = = Low VoltageVFEED = = Source CurrentVFEED = ; VVA-OUT = Sink CurrentVFEED = ; VVA-OUT = SECTIONVrefReference Output Voltage 25 C < TJ < 85 = 25 C Iref = VrefLoad Regulation1mA Iref 10mA 25 C < TJ < 85 C315mV VrefLine Regulation12V VCC 19V 25 C < TJ < 85 C310mVIref scShort Circuit CurrentVref = 0V203050mAOSCILLATOR SECTION foscInitial AccuracyTj = 25 C85100115 KHzFrequency Stability12V VCC 19V 25 C < TJ < 85 C80100120 KHzVsvpRamp Valley to CurrentVCOSC = CurrentVCOSC = Valley SECTION (Only for L4981A))

10 TWOutput Pulse Width50% sI16 Sink Current with Low OutputVoltageVSYNC = = Current with High OutputVoltageVSYNC = = Input Input for Synchronization800nsFREQUENCY MODULATION FUNCTION (Only for L4981B)f18maxMaximum Oscillation FrequencyVFREQ-MOD = 0V (Pin 16) Ifreq = 085100115 KHzf18minMinimum Oscillator FrequencyIFREQ-MOD = 360 A (Pin 16)VVRMS = 4V (Pin 7)74 KHzIFREQ-MOD = 180 A (Pin 16)VVRMS = 2V (Pin 7)76 KHzSOFT START SECTIONISSSoft Start Source CurrentVSS = 3V60100140 AV12satOutput Saturation VoltageV3 = 6V, ISS = - L4981B4/16 ELECTRICAL CHARACTERISTICS (continued)SymbolParameterTest VOLTAGEVCCO perating Supply VOLTAGE PROTECTION COMPARATORVthrRising Threshold +20mVVV3 HysHysteresis180250320mVI3 Input Bias AtdPropagation delay to outputVOVP = Vthr +100mV12 sOVER CURRENT PROTECTION COMPARATORVthThreshold Voltage 30mVtdPropagation delay to OutputVOCP = Vthr sIipkCurrent Source GeneratorVIPK = only for L4981A6585105 AILL eakage CurrentVIPK = only for L4981B5 ACURRENT AMPLIFIER SECTIONV offsetInput Offset VoltageVMULT OUT = VSENSE = 2mVI9biasInput Bias CurrentVSENSE = 0V-50050500nAOpen Loop VCA OUT 6V70100dBSVRS upply Voltage Rejection12V VCC 19 VVMULT