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IL3842 Dataheets PDF



Part Number IL3842
Manufacturers IK Semiconductor
Logo IK Semiconductor
Description Current mode controller
Datasheet IL3842 DatasheetIL3842 Datasheet (PDF)

TECHNICAL DATA Fixed Frequency Current Mode PWM Controller IL3842 DESCRIPTION Fixed frequency current-mode PWM controller. It is specially designed for Off Line And DC-to-DC converter applications with minimal external component. This integrated circuit features a trimmed oscillator for precise duty cycle control. a temperature compensated reference, high gain arror amplifier, current sensing comparator, and a high current totempole output ideally suited for driving a power MOSFET. Protection.

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TECHNICAL DATA Fixed Frequency Current Mode PWM Controller IL3842 DESCRIPTION Fixed frequency current-mode PWM controller. It is specially designed for Off Line And DC-to-DC converter applications with minimal external component. This integrated circuit features a trimmed oscillator for precise duty cycle control. a temperature compensated reference, high gain arror amplifier, current sensing comparator, and a high current totempole output ideally suited for driving a power MOSFET. Protection circuitry includes built in under-voltage lockout and current limiting. FEATURES ♦ Automatic Feed Forward Compensation ♦High Gain Totem Pole Output ♦Internally Trimmed Bandgap Reference ♦Undervoltage Lockout with Hysteresis ♦Low Start Up Current ♦Optimized for offline converter ♦Double pulse suppression ♦Current mode operation to 500KHz w w w t a .D S a e h U 4 t e .c m o ORDERING INFORMATION Device IL3842 Operating Package Temperature Range TA=0° to +70°C DIP-8 1 www.DataSheet4U.com IL3842 PIN FUNCTION DESCRIPTION Pin Function No. 1 Compensation 2 3 4 5 6 7 8 Voltage Feedback Current Sense RT/CT GND Output Vcc VREF Description This pln is the Error Amplifier output and is made available for loop compensation This is the inverting input of the Error Amplifier. It is normally connected to the switching power supply outpul through a resistor divider. A voltage proportional to inductor current is connected to this input. The PWM uses this. information to terminate the output switch conduction The Oscillator frequency and maximum Output duty cycle are programmed by connecting resistor RT to VREF and capacitor CT to ground. Operation to 500kHz is possible. This pin is the combined conlrol circuitry and power ground This output directly drives the gate of a power MOSFET. Peak currents up to 1,0A are sourced and sunk by this pin. This pin is the positive supply of the control IC. This is the reference output. It provides chsarging current for capacitor CT through resistor RT ABSOLUTE MAXIMUM RATINGS Characteristic Total Power Supply and Zener Current Output Current Output Energy (Capacitive Load per Cycle) Error Amp Output Sink Current Current Sense and Voltage Feedback Inputs Maximum Power Dissipation @ TA= 25 C: Thermal Resistance,Junction-to-Air Operating Junction Temperature Storage Temperature Range o Symbol (ICC+ IZ) IO W IOE Vin PD RθJA TJ Tstg Value 30 ±1.0 5.0 10 -0.3 to 5.5 0.862 145 +150 -65 ~ +150 Unit mA A µJ mA V W °C/W o C o C 2 IL3842 ELECTRICAL CHARACTERISTICS (Vcc=15V unless otherwise noted) Characteristics REFERENCE SECTION Reference Output Voltage (IO=1.0mA, VCC=15V,TA=25±10°C) (IO=1.0mA, VCC=15V,TA= Tlow to Thigh) Line Regulation (VCC=12V to 25V,TA=Tlow to Thigh) Load Regulation (IO=1.0 to 20mA,TA=Tlow to Thigh) Total Output Variation over Line,Load,Temperature (Note1) (VCC=12V, IO=1.0mA,TA=Tlow to Thigh) (VCC=25V, IO=20mA,TA=Tlow to Thigh) Output Short Circuit Current (VCC=15V) Symbol Vref Regline Regload Vfinal ISC fosc ∆fosc/∆V Idisch VFB IIB AVOL BW PSRR ISink ISource VOH VOL 7.5 7.2 2.42 65 0.7 60 2.0 -0.5 5.0 1.1 4.82 -30 47 46 Min 4.9 4.865 Max 5.1 5.135 20 25 5.18 -180 57 60 1.0 9.3 9.5 2.58 -2.0 Unit V mV mV V mA kHz % mA V µA dB MHz dB mA V OSCILLATOR SECTION Frequency (VCC=15V,Tj=25°C,RT=10k,CT=3.3nF) (VCC=15V, TA=Tlow to Thigh,RT=10k,CT=3.3nF) Frequency Change with Voltage (VCC=12V to 25V, TA=Tlow to Thigh,RT=10k,CT=3.3nF) Discharge Current (Vosc=2.0V, VCC=15V) Tj=25°C TA=Tlow to Thigh ERROR AMPLIFIER SECTION Voltage Feedback Input (VO=2.5V,VCC=15V, TA=Tlow to Thigh) Input Bias Current (VFB=2.7V,VCC=15V, TA=Tlow to Thigh) Open Loop Voltage Gain (VO=2.0V to 4.0V,VCC=15V, TA=Tlow to Thigh) Unity Gain Bandwidth (VCC=15V, TA=Tlow to Thigh) Power Supply Rejection Ratio (VCC=12V to 25V, TA=Tlow to Thigh) Output Current Sink (VO=1.1V,VFB=2.7V, VCC=15V, TA=Tlow to Thigh) Source (VO=5.0V,VFB=2.3V, VCC=15V, TA=Tlow to Thigh) Output Voltage Swing High State (VFB=2.3V, VCC=15V,RL(GND)=15k, TA=Tlow to Thigh) Low State (VFB=2.7V, VCC=15V,RL(5.0)=15k, TA=Tlow to Thigh) CURRENT SENSE SECTION Current Sense Input Voltage Gain (VFB=0V, VCC=15V, TA=Tlow to Thigh) Maximum Current Sense Input Threshold (VFB=0V, VCC=15V, TA=Tlow to Thigh) Input Bias Current (VCC=15V, TA=Tlow to Thigh) Propagation Delay (Current Sense Input to Output) (VCC=15V, TA=Tlow to Thigh) Av Vth IIB tPLH 2.85 0.9 3.15 1.1 -10 300 V/V V µA ns 3 IL3842 ELECTRICAL CHARACTERISTICS (Vcc=15V unless otherwise noted) Characteristics OUTPUT SECTION Output Voltage Low State (Sink=20mA, VCC=15V) (Sink=200mA, VCC=15V) High State (Sink=20mA, VCC=15V) (Sink=200mA, VCC=15V) Output Voltage with UVLO Activated (VCC=6.0V, ISink,=1.0mA, TA=Tlow to Thigh) Output Voltage Rise Time (CL=1.0nF, VCC=15V, TA=Tlow to Thigh) Output Voltage Fall Time (CL=1.0nF, VCC=15V, TA=Tlow to Thigh) ONDERVOLTAGE LOCKOUT SECTION Startup Threshold (VCC=0V to 25V,TA=Tlow to Thigh) Minimum Operating Voltage After Turn-On (VCC=0V to 25V,TA=Tlow to Thigh) P.


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