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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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AS3658 Arkusz danych(PDF) 72 Page - ams AG |
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AS3658 Arkusz danych(HTML) 72 Page - ams AG |
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72 / 158 page  www.austriamicrosystems.com Revision 1v13 71 - 157 AS3658 Data Sheet Confidential - Detail ed Descri ption-Power Management Functions Figure 28. sdX_dis_curmin=1 operation 1: LX voltage, 2:coil current (1mV=1mA) 3: Vout High efficiency operation (default setting): Bit settings: sdX_dis_curmin=0 In this mode there is a minimum coil current necessary before switching off the PMOS. As result there are less pulses at low output load necessary, and therefore the efficiency at low output load is increased. This results in higher ripple, and noisy pulse skip operation up to a higher output current. Figure 29. sdX_dis_curmin=0 operation 1: LX voltage, 2:coil current (1mV=1mA) 3: Vout It’s also possible to switch between these two modes during operation: For Example: sdX_dis_curmin=0: System is in idle state. No audio, RF signal. Decreased supply current preferred. Increased ripple doesn’t affect system performance. sdX_dis_curmin=1: System is operating. Audio signal on and/or RF signal used. Decreased ripple and noise preferred. Increased power supply current can be tolerated. |
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