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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN4376 датащи(PDF) 24 Page - STMicroelectronics |
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AN4376 датащи(HTML) 24 Page - STMicroelectronics |
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24 / 37 page  PFC waveforms AN4376 24/37 DocID025380 Rev 1 7.2 Transition mode operation During ON-time, the peak drain current is modulated by a signal proportional to the ILED pin. This reference sets the turn-off of the MOSFET. The MOSFET turn-on depends on the DMG signal that senses the demagnetization of the drain current realizing a transition mode operation. A primary inductance of 1.1 mH has been selected in order to obtain the converter switching frequency into the interval [35 - 70] kHz (Magnetica PN-2267.0001). Figure 22. Transition mode operation at 100 VAC - 50 Hz Figure 23. Transition mode operation at 100 VAC - 50 Hz -zoom of signals CH1: DRAIN CH2: CS CH3: ILED CH4: DMG CH1: DRAIN CH2: CS CH3: ILED CH4: DMG Figure 24. Transition mode operation at 230 VAC - 50 Hz Figure 25. Transition mode operation at 230 VAC - 50 Hz - zoom of signals CH1: DRAIN CH2: CS CH3: ILED CH4: DMG CH1: DRAIN CH2: CS CH3: ILED CH4: DMG |
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