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AMC384XBDF 数据表(PDF) 6 Page - List of Unclassifed Manufacturers |
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AMC384XBDF 数据表(HTML) 6 Page - List of Unclassifed Manufacturers |
6 / 10 page AMC DOC. #: AMC3842B_C (LF) AMC3842B/43B March 2004 CURRENT MODE PWM CONTROLLER Copyright © 2002, ADD Microtech Corp. 6 www.addmtek.com Application Information Fig. 1. Current Sense Circuit Peak current (IS) is set by: IS(MAX) = 1V/RS Fig. 3. Oscillator Section 1.72 Fig. 2. Error Amplifier Configuration - the amplifier can source or sink up to 0.5mA For RT < 5K, f = RTCT Error Amp 2R 1V R Current Sense Comparator COMP Rf ISENSE RS Cf GND VREF 2.5V 0.5mA Error Amp RT RT/CT VFB Zi CT GND COMP Zf Fig. 4. Open-loop laboratory test fixture: Careful grounding techniques are necessary for high peak currents associated with capacitive loads. Timing and bypass capacitors should be connected to GND pin in a single point ground. The transistor and 5K potentiometer are used to sample the oscillator waveform and apply an adjustable ramp to the ISENSE pin VREF RT VCC 2N2222 4.7K 100K VREF COMP 0.1 µF 1K Error AMP Adjust 1K, 1W VFB VCC 5K ISENSE Adjust Output ISENSE Output 4.7K 0.1 µF RT/CT GND GND CT |
类似零件编号 - AMC384XBDF |
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类似说明 - AMC384XBDF |
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