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LM3842A Datasheet(PDF) 1 Page - HTC Korea TAEJIN Technology Co. |
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LM3842A Datasheet(HTML) 1 Page - HTC Korea TAEJIN Technology Co. |
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CURRENT MODE PWM CONTROLLER LM3842A/3A/4A/5A FEATURES ● Automatic feed forward compensation ● Optimized for offline converter ● Double pulse suppression ● Current mode operation to 500 KHz ● High gain totem pole output ● Internally trimmed bandgap reference ● Undervoltage lockout with hysteresis ● Low start up current :＜ 0.3 mA ORDERING INFORMATION Device Package DESCRIPTION LM3842A/3A/4A/5A D 8 SOP LM3842A/3A/4A/5A N 8 DIP The LM3842A is fixed frequency current-mode PWM controller. It is specially designed for Off-Line and DC-to-DC converter applications with minimal external components. This integrated circuit features a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error 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. SIMPLIFIED BLOCK DIAGRAM ABSOLUTE MAXIMUM RATINGS (TA= 25℃) Characteristic Symbol Value Unit Power Supply Voltage Vcc 30 V Output Current I ± 1 A Analog Inputes Voltage VIN -0.3 to 5.5V V Error Amp Output Sink Current ISINK 10 mA Power Dissipation PD 1 W Storage Temperature RangeTstg -65 to 150 ℃ Lead Temperature (soldering 5 sec) T 260 ℃ HTC 1 5V Reference Vcc Undervoltage Lockout Latching PWM Oscillator VREF Undervoltage Lockout + - ⑦ Vcc ⑥ Output ⑤ Ground ③ Current Sense Input VREF ⑧ RT/CT ④ VFB ② COMP ① Error Amplifie r R R 1 2 3 4 8 7 6 5 Voltage Feedback Current Sense RT/CT Vcc OUTPUT GND VREF Compen sation 8 SOP/ 8 DIP PIN Configulation |
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