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LM3845A Datasheet(PDF) 1 Page - HTC Korea TAEJIN Technology Co. |
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LM3845A Datasheet(HTML) 1 Page - HTC Korea TAEJIN Technology Co. |
1 / 6 page 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 ● Moisture Sensitivity Level 3 ORDERING INFORMATION DESCRIPTION The LM384xA are fixed frequency current-mode PWM controller. They are specially designed for Off-Line and DC-to-DC converter applications with minimal external components. These integrated circuits 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 Io ± 1 A Analog Inputes Voltage VIN -0.3 to 5.5V V Error Amp Output Sink Current ISINK 10 mA Power Dissipation PD 1W Storage Temperature RangeTstg -65 to 150 ℃ Lead Temperature (soldering 5 sec) TL 260 ℃ 2008 - Ver. 1.0 HTC LM3842A/3A/4A/5A N 8 DIP − 1 − Device Package LM3842A/3A/4A/5A D 8 SOP 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 Voltage Feedback Current Sense RT/CT Vcc OUTPUT GND VREF Compen sation 8 SOP/ 8 DIP PIN Configulation 1 2 3 4 8 7 6 5 SOP-8 PKG DIP-8 PKG |
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