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LM3842A Arkusz danych(PDF) 3 Page - HTC Korea TAEJIN Technology Co. |
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LM3842A Arkusz danych(HTML) 3 Page - HTC Korea TAEJIN Technology Co. |
3 / 6 page CURRENT MODE PWM CONTROLLER LM3842A/3A/4A/5A Note: 1. Adjust Vcc above the start threshould before setting at 15V. 2. Parameter measured at trip point of latch with VFB - 0. 3. Comparator Gain defined as: Fig.1 Open Loop Test Circuit High peak currents associated with capacitive loads necessitate careful grounding techniques Timing and bypass capacitors should be connected close to pin 5 in a single point ground. The transistor and 5KΩ potentiometer are used to sample the oscillator waveform and apply an adjustable ramp to pin 3. Fig.2 Under Voltage Lockout LM3842A LM3843/5A VON 16V 8.4V VOFF 10V 7.6V During Under-Voltage Lock-Out, the output driver is biased to a high impedance state. Pin 6 should be shunted to ground with a bleeder resistor to prevent activating the power switch with output leakage current. HTC − 3 − ΔV Output Compensation(pin FB) ΔV Current Sanseinput(pin CS) A = ; 1 2 3 4 8 7 6 5 COMP VREF VFB VC OUTPUT GND ISENSE RT/CT LM3842A 0.1 0.1 A CT OUTPUT 1K/1W VREF V1 RT 100K 2N 2222 4.7K E/A ADJUST 1K 5K ISENSE ADJUST 4.7K 7 ON/OFF COMMAND TO REST OF IC < 15mA < 1mA VOFF VON VCC ICC |
Podobny numer części - LM3842A |
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Podobny opis - LM3842A |
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