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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN4346 датащи(PDF) 23 Page - STMicroelectronics |
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AN4346 датащи(HTML) 23 Page - STMicroelectronics |
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23 / 33 page  DocID025107 Rev 1 23/33 AN4346 Electrical waveform 33 3.2 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 demagnetization of the drain current realizing a transition mode operation. A primary inductance of 1.5 mH has been selected in order to obtain the converter switching frequency into the interval [45 - 90] kHz. Figure 26. ILED pin operation at 100 Vac - 50 Hz Figure 27. Transition mode operation at 100 Vac - 50 Hz - zoom on the peak - fsw = 51 kHz CH1: DRAIN pin CH2: CS pin CH3: ILED pin CH4: DMG pin CH1: DRAIN pin CH2: CS pin CH3: ILED pin CH4: DMG pin Figure 28. ILED pin operation at 230 Vac - 50 Hz Figure 29. Transition mode operation at 230 Vac - 50 Hz - zoom on the peak - fsw = 83 kHz CH1: DRAIN pin CH2: CS pin CH3: ILED pin CH4: DMG pin CH1: DRAIN pin CH2: CS pin CH3: ILED pin CH4: DMG pin |
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