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LM3845AD Fiches technique(PDF) 6 Page - HTC Korea TAEJIN Technology Co. |
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LM3845AD Fiches technique(HTML) 6 Page - HTC Korea TAEJIN Technology Co. |
6 / 7 page CURRENT MODE PWM CONTROLLER Fig.1 Output Dead Time Fig.2 Timing Resistor vs Frequency Fig.3 Output Saturation Characteristics Fig.4 Error Amplifier Open Loop Gain and Phase Frequency PIN FUNCTION DESCRIPTION Pin No. Function Description 1 Compensation This pin is the Error Amplifier output and is made available for loop compensation. 2 Voltage This is the inverting input of the Error Amplitier. It is normally connected Feedback to the switching power supply output through a resister divider. 3 Current Sense A voltage proportional to inductor current is connected to this input. The PWM uses this information to terminate the output switch conduction. 4 RT/CT 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. 5 GND This pin is the combined control circuitry and power ground. 6 Output This output directly drives the gate of a power MOSFET. Peak currents up to 1.0A are sourced and sunk by this pin. 7 Vcc This pin is the positive supply of the control IC. 8 VREF This is the reference output. It provides charging current for capacitor CT through resistor RT. HTC 6 LM3842A/3A/4A/5A 10 -3 24 6 8 10-1 24 8 6 4 2 0 1 3 SINK (VOL) VCC=15V TA=25℃ SOURCE (V CC-VOH) Io, Output Load Current (A) 80 50 20 8.0 5.0 1.0M 2.0 0.8 10k 20k 50k100k 500k 200k fosc, Frequency (kHz) CT=10nF CT=5.0nF CT=2.0nF CT=1.0nF CT=500pF CT=200pF CT=100pF 100 30 10 3 1M 100k 10k 1k 100 fosc, Frequency(Hz) CT=100nF CT=47nF CT=22nF CT=10nF CT=4.7nF CT=2.2nF CT=10nF 80 60 40 10K 100K 1M 1K 100 0 -135 10 -180 0 -45 20 Fosc, Frequency (Hz) -90 10M Gain Phase |
Numéro de pièce similaire - LM3845AD |
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Description similaire - LM3845AD |
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