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4 / 7 page RAMP GENERATOR IC 22nF 22nF 10 Ω 470 Ω V6 6 V5 5 V3 31 42 7 8 9 10 11 12 13 14 TEA2019 0V -1V AS1 10nF 10nF 10k Ω 8.2k Ω 4.7 µF 4.7 µF V12 V14 47nF 1.5nF 3.3nF 22nF 3.9k Ω 56k Ω 1% 59k Ω V10 100 Ω TYPICAL CIRCUIT GENERAL DESCRIPTION (see application note AN406/0591) Operating Principles (Figure 1) On every period, the beginning of the conduction time of the transistor is triggered by the fall of the oscillator saw-tooth which acts as clock signal. The period Tosc is given by : Tosc ≈ 0.69 Ct (Rt + 2000) (Tosc in seconds, Ct in Farad, Rt in Ω) The end of the conduction time is determined by a signal issued from comparing the following signals. a) the sawtooth waveform representing the collector current of the switching transistor, sampled across the emitter shunt resistor. b) the output of the error amplifier. Base Drive • Fast turn-on On each period, a current pulse ensures fast transistor switch-on. This pulse performs also the ton(min) function at the beginning of the conduction. • Proportional base drive In order to save power, the positive base current after the starting pulse becomes an image of the collector current. The ratio IC IB is programmed as follows (Figure 2). IC IB = RB RE Figure 1 : Current Mode Control C I SENSE OSCILLATOR ERROR SIGNAL ERROR AMPLIFIER COMPARATOR S R Q FLIP-FLOP V REF I C V i OUTPUT FILTER Re t t t Error Signal OSCILLATOR SAWTOOTH I (sample) FLIP-FLOP OUTPUT C TEA2019 4/7 |
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