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AMC384XBDM Datasheet(PDF) 7 Page - ADDtek Corp |
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AMC384XBDM Datasheet(HTML) 7 Page - ADDtek Corp |
7 / 11 page AMC3842B/43B/44B/45B Copyright © 2006 ADDtek Corp. 7 DD019_F -- OCTOBER 2006 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 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 GND ISENSE COMP Error Amp RS Rf Cf R 2R 1V Current Sense Comparator 4.7K 1K Error AMP Adjust 4.7K 2N2222 100K 5K ISENSE Adjust COMP VFB ISENSE RT/CT GND VREF VCC Output 0.1 µF Output 1K, 1W VCC VREF 0.1 µF GND CT RT 2.5V Zf Zi 0.5mA VFB COMP Error Amp GND RT/CT VREF CT RT |
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