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STPM098C 数据表(PDF) 92 Page - STMicroelectronics |
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STPM098C 数据表(HTML) 92 Page - STMicroelectronics |
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92 / 110 page  Figure 77. ADE activation timing diagram VOUTn VID ISEN1 0V ZC_OFFSET<0mV IPH1 0A ZC_OFFSET<0A SW1 PWM1 ZC OFFSET NEGATIVE t ZC OFFSET POSITIVE t VOUTn VID ISEN1 ZC_OFFSET>0mV 0V IPH1 ZC_OFFSET>0A 0A SW1 PWM1 Figure 78. ADE timing diagram with masking delay VOUTn VID ISEN1 ZC_TH>0mA 0V IPH1 ZC_TH>0A 0A SW1 PWM1 ZC NEGATIVE OFFSET and MASK DELAY t ZC_mask_delay In order to prevent pulse skipping frequency reduction to enter the audible band, switching frequency clamp to 30 kHz can be applied by means of a dedicated PMBus™ command as follows: Table 73. ADE frequency clamp enable bit ULTRASONIC_ENA Description 0 ADE frequency clamp disabled (default) 1 ADE frequency clamp enabled STPM098C Functional description DS14440 - Rev 1 page 92/110 |
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