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AV3842A Dataheets PDF



Part Number AV3842A
Manufacturers Avic Technology
Logo Avic Technology
Description (AV3842A / AV3843A) LINEAR INTEGRATED CIRCUIT
Datasheet AV3842A DatasheetAV3842A Datasheet (PDF)

@vic AV3842A / 3843A LINEAR INTEGRATED CIRCUIT CURRENT MODE PWM CONTROL CIRCUITS DESCRIPTION The @vic AV3842A/3843A provide the necessary functions to implement off-line or DC to DC fixed frequency current mode , controlled switching circuits with a minimal external part count SOP-8 FEATURES *Low external part count. *Low start up current ( Typical 0.12mA ) *Automatic feed forward compensation *Pulse-by-Pulse current limiting *Under-voltage lockout with hysteresis *Double pulse Suppression *H.

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@vic AV3842A / 3843A LINEAR INTEGRATED CIRCUIT CURRENT MODE PWM CONTROL CIRCUITS DESCRIPTION The @vic AV3842A/3843A provide the necessary functions to implement off-line or DC to DC fixed frequency current mode , controlled switching circuits with a minimal external part count SOP-8 FEATURES *Low external part count. *Low start up current ( Typical 0.12mA ) *Automatic feed forward compensation *Pulse-by-Pulse current limiting *Under-voltage lockout with hysteresis *Double pulse Suppression *High current totem pole output to drive MOSFET directly *Internally trimmed band gap reference *500kHz operation DIP-8 BLOCK DIAGRAM 7 Vcc Vref 8 Internal Bias 1/2Vref 5V REF S/R 5 GND Vref Good Logic 1/3Vref U.V.L.O www.DataSheet.net/ CURRENT SENSE COMPARATOR R PWM LATCH S 7 Vcc VFB COMP 2 1 ERROR AMPLIFIER 1V 6 OUTPUT CURRENT SENSE 3 RT/CT 4 5 GND OSCILLATOR ABSOLUTE MAXIMUM RATINGS(Ta=25°C) PARAMETER Supply Voltage(Low Impedance Source) Supply Voltage(Icc<30mA) Output Current ( Peak ) Output Energy(capacity Load) Analog Inputs(pin 2,3) Error Amplifier Output Sink Current Power Dissipation Lead Temperature( Soldering 10 Sec ) SYMBOL VCC Vcc Io VI(ANA) ISINK(EA) PD DIP-8 SOP-8 Tlead VALUE 30 Self Limiting +-1 5 -0.3 ~ +6.3 10 at Tamb<=25°C 1.0 at Tamb<=25°C 0.5 300 UNIT V V A µJ V mA W W °C QW-R103-002,B Datasheet pdf - http://www.DataSheet4U.co.kr/ @vic (continued) AV3842A / 3843A LINEAR INTEGRATED CIRCUIT PARAMETER SYMBOL Tstg Tj VALUE -65 ~ +150 +150 UNIT °C °C Storage Temperature Operating junction temperature Note 1: Ta>25°C, PD derated with 8mW/°C. ELECTRICAL CHARACTERISTICS (0°C <=Ta<=70°C,VCC=15V,RT=10kΩ,CT=3.3nF,unless otherwise specified) PARAMETER Reference Section Output Voltage Line Regulation Load Regulation Temperature Stability Total Output Variation Output Noise Voltage Long Term Stability Output Short Circuit SYMBOL VREF ∆VREF ∆VREF TEST CONDITIONS Tj=25°C,Io=1mA 12<=VIN<=25V 1<=Io=20mA (Note 2) Line, Load, Temp(note 2) 10Hz<=f<=10kHz,Tj=25°C (note 2) Ta=25°C,1000Hrs(note 2) MIN 4.9 TYP 5 6 6 0.2 50 5 -100 52 0.2 5 1.7 2.50 -0.3 90 1 70 6 -0.8 6 0.7 3 1 70 -2 150 0.1 1.5 13.5 13.5 50 50 16 8.4 10 7.6 MAX 5.1 20 25 0.4 5.18 25 -180 57 1 UNIT V mV mV mV/°C V uV mV mA kHz % % V V µA dB MHz dB mA mA V V V/V V dB µA ns V V V V ns ns V V 4.82 Vosc ISC f ∆f/∆Vcc Vosc VI(EA) IBIAS -30 Tj=25°C 12<=Vcc<=25V Tmin<=TA<=Tmax(note 2) Vpin 4 peak to peak Vpin 1=2.5V 2 <=Vo<=4V Tj=25°C (note 2) I2<=Vcc<=25V Vpin 2=2.7V,Vpin 1=1.1V Vpin 2=2.3V,Vpin 1=5V Vpin 2=2.3V, RL=15kΩ to GND Vpin 2=2.7V,Vpin 1=1.1V www.DataSheet.net/ Oscillator Section Initial Accuracy Voltage Stability Temperature Stability Amplitude 47 Error Amplifier Section Input Voltage Input Bias Current AVOL Unity Gain Bandwidth PSRR Output Sink Current Output Source Current Vout High Vout Low 2.42 60 0.7 60 2 -0.5 5 2.58 -2 Isink Isource VOH VOL GV VI(MAX) IBIAS 1.1 3.15 1.1 -10 300 0.4 2.2 Current Sense section Gain Maximum Input signal PSRR Input Bias Current Delay to Output (note 3,4) Vpin 1=5V( note 3) 12<=Vcc<=25V Vpin 3=0 to 2V VOL VOH tR tF VTH(ST) VOPR(min) Isink=20mA Isink=200mA Isource=20mA Isource=200mA Tj=25°C,CL=1nF(note 2) Tj=25°C,CL=1nF(note 2) UTC3842A UTC3843A After Turn On UTC3842A UTC3843A 2.85 0.9 Output Section Output Low Level Output High Level Rise Time Fall Time Start Threshold Min. Operating Voltage 13 12 150 150 17.5 9 11.5 8.2 Under-Voltage Lockout Output Section 14.5 7.8 8.5 7 V PWM Section QW-R103-002,B Datasheet pdf - http://www.DataSheet4U.co.kr/ @vic AV3842A / 3843A LINEAR INTEGRATED CIRCUIT SYMBOL D(MAX) D(MIN) PARAMETER Maximum Duty Cycle Minimum Duty Cycle TEST CONDITIONS MIN 95 TYP 97 MAX 100 0 UNIT % % Total Standby Current Start-up Current IST Operating Supply Current ICC(opr) Vpin 2=Vpin 3=0V Vcc Zener Voltage Vz Icc=25mA note 2:These parameters, although guaranteed ,are not 100% tested in production. note 3:Parameters measured at trip point of latch with Vpin 2=0. note 4:Gain defined as: 0.12 11 34 0.3 17 mA mA V A= ∆Vpin 1 ∆Vpin 3 ; 0<=Vpin3<=0.8V note 5:Adjust Vcc above the start threshold before setting at 15V. OPEN-LOOP LABORATORY TEST FIXTURE Vref 4.7kΩ RT 100kΩ 0.1 µF 1 2 8 7 6 A 0.1 µF Vcc Error Amp Adjust 4.7kΩ Isense Adjust 1kΩ / 1W OUTPUT 3 5kΩ 4 CT 5 High peak current associated with capacity loads necessitate careful grounding techniques. Timing and bypass capacitors should be connected close to pin 5 in single point GND. The transistor and 5kΩ potentio-meter are used to sample the oscillator waveform and apply an adjustable Ramp to Pin 3. www.DataSheet.net/ UNDER-VOLTAGE LOCKOUT Icc Vcc <15mA 7 ON/OFF Command to rest of IC Von=16V Voff=10V <1mA Voff Von Vcc During Under-Voltage Lockout, the output driver is biased to a high impedance state. Pin 6 should be shunt to GND with a bleeder resistor to prevent activating the power switch with output leakage currents. QW-R103-002,B Datasheet pdf - http://www.DataSheet4U.co.k.


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