 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
LM3842A Datasheet(PDF) 3 Page - HTC Korea TAEJIN Technology Co. |
|
||||||||||||||||||||||||||||||
LM3842A Datasheet(HTML) 3 Page - HTC Korea TAEJIN Technology Co. |
|
|
3 / 7 page 
CURRENT MODE PWM CONTROLLER LM3842A/3A/4A/5A 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 LM3843A/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. Fig.3 Error Amp Configuration HTC 3 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 1K 5K ISENSE ADJUST 4.7K E/A ADJUST Error amp can source or sink up to 0.5mA 2 1 - + Zi Zf COMP VFB 0.5mA 2.5V 7 ON/OFF COMMAND TO REST OF IC < 15mA < 1mA VOFF VON VCC ICC |
English ▼
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
