поискавой системы для электроныых деталей |
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KA7540 датащи(PDF) 7 Page - Samsung semiconductor |
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KA7540 датащи(HTML) 7 Page - Samsung semiconductor |
7 / 14 page KA7540 KA7540 KA7540 KA7540 7 7 7 7 Figure 2. Oscillator sawtooth & Output gate drive waveform Figure 2. Oscillator sawtooth & Output gate drive waveform Figure 2. Oscillator sawtooth & Output gate drive waveform Figure 2. Oscillator sawtooth & Output gate drive waveform As a result, the switching frequency is as following Ts = 2 × (∆Tch + ∆Tdis) = 40µs fsw = 1 / TS = 25kHz The explicit equation calculating the value of the timing capacitor for a certain switching frequency is written below. Soft Start Soft Start Soft Start Soft Start The switching frequency is decreasing linearly from the pre-heating frequency to the normal switching frequency. In KA7540, the normal timing capacitor charging current is increased by 25 µA during the pre-heating mode. This addition of the charging current sets the pre-heating frequency to be 1.33 times the switching frequency at the normal mode. Figure 3. Frequency & Soft start capacitor voltage variation during soft start and dimming mode Figure 3. Frequency & Soft start capacitor voltage variation during soft start and dimming mode Figure 3. Frequency & Soft start capacitor voltage variation during soft start and dimming mode Figure 3. Frequency & Soft start capacitor voltage variation during soft start and dimming mode Vct (Pin #2) Voutput (Pin #6, 7) Charging Period( ∆Tch) Discharging Period( ∆Tdis) Vhigh Vlow 14V 0V Ct 11.76 10 6 – × fsw --------------------------------- = fsw, VCS fsw (pre) fsw (dim) fsw (nor) 3.5V 2.7V 2V 0.95 ts/s td1 td2 |
Аналогичный номер детали - KA7540 |
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Аналогичное описание - KA7540 |
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