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UTC3843D Dataheets PDF



Part Number UTC3843D
Manufacturers YOUWANG
Logo YOUWANG
Description PWM CONTROLLER
Datasheet UTC3843D DatasheetUTC3843D Datasheet (PDF)

UTC3843D/E LINEAR INTEGRATED CIRCUIT CURRENT MODE PWM CONTROL CIRCUITS DESCRIPTION The UTC3843D/E provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include under-voltage lockout featuring start up current less than 1mA,a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current l.

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UTC3843D/E LINEAR INTEGRATED CIRCUIT CURRENT MODE PWM CONTROL CIRCUITS DESCRIPTION The UTC3843D/E provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include under-voltage lockout featuring start up current less than 1mA,a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control,and a totem pole output stage designed to source or sink high peak current.The output stage, suitable for driving N channel MOSFETs,is low in the off state. DIP-8 FEATURES *Optimized for off-line and DC to DC converts *Low start up current(<1mA) *Automatic feed forward compensation *Pulse-by-Pulse current limiting *Enhanced load response characteristics *Under-voltage lockout with hysteresis *Double pulse Suppression *High current totem pole output *Internally trimmed bandgap reference *500kHz operation *Low Ro error amp SOP-8 ORDERING INFORMATION Device Package UTC3248D DIP-8-300-2.54 UTC3248E SOP-8-225-1.27 BLOCK DIAGRAM Vref 8 Internal Bias VFB 2 COMP 1 CURRENT SENSE 3 RT/CT 4 1/2Vref ERROR AMPLIFIER 5V REF S/R Vref Good Logic 1/3Vref U.V.L.O CURRENT SENSE COMPAREATOR 1V R PWM LATCH S OSCILLATOR 7 Vcc 5 GND 7 Vcc 6 OUTPUT 5 GND YOUWANG ELECTRONICS CO.LTD 1 2006.07.11 UTC3843D/E LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS(Ta=25°C) Characteristic Symbol Value Unit Supply Voltage(Low Impedence Source) VCC 30 V Supply Voltage(Icc<30mA) Vcc Self Limiting V Output Current Io ±1 A Output Energy(capacitive Load) 5 µJ Analog Inputs(pin 2,3) VI(ANA) -0.3 to +6.3 V Error Amplifier Output Sink Current ISINK(EA) 10 mA Power Dissipation PD at Tamb≤25°C 1.0 W Lead Temperature Tlead 300 °C Storage Temperature Tstg -65~+150 °C Note 1: Ta>25°C,PD derated with 8mW/°C. ELECTRICAL CHARACTERISTICS (0≤Ta≤70°C,VCC=15V,RT=10kΩ,CT=3.3nF,unless otherwise specified) Characteristic Symbol Test Conditions Min Typ Max Units Reference Section Output Voltage VREF Tj=25°C,Io=1mA 4.90 5.00 5.10 V Line Regulation ∆VREF 12≤VIN≤25V 6 20 mV Load Regulation ∆VREF 1≤Io=20mA 6 25 mV Temp Dtability (Note 2) 0.2 0.4 mV/°C Total Output Variation Line,Load,Temp(note 2) 4.82 5.18 µV Output Noise Voltage Vosc 10Hz≤f≤10kHz,Tj=25°C (note 2) 50 mV Long term stability Ta=25°C,1000Hrs(note 2) 5 25 mV Output Short Circuit ISC -30 -100 -180 mA Oscillator Section Initial Accurcy f Tj=25°C 47 52 57 kHz Voltage Stability ∆f/∆Vcc 12≤Vcc≤25V 0.2 1 % Temp stability Tmin≤TA≤Tmax(note 2) 5 % Amplitude Vosc Vpin 4 peak to peak 1.7 V Error Amplifier Section Input Voltage VI(EA) Vpin 1=2.5V 2.42 2.50 2.58 V Input Bias current IBIAS -0.3 -2 µA AVOL 2 ≤Vo≤4V 60 90 dB Unity Gain Bandwidth Tj=25°C (note 2) 0.7 1 mHz PSRR I2≤Vcc≤25V 60 70 dB Output S.


MM50G3U120BMX UTC3843D UTC3843E


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