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L99LD01 Datasheet(PDF) 22 Page - STMicroelectronics |
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L99LD01 Datasheet(HTML) 22 Page - STMicroelectronics |
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22 / 69 page  Functional description L99LD01 22/69 DocID025319 Rev 3 The external resistor applied between pin RSF and ground is setting the converter working frequency. The voltage applied on pin RSF is the internal reference reported by the source follower structure which is a constant voltage of 1.21 V. The converter frequency is directly related to the current flowing through the RSF pin. Figure 12 reports the behavior of frequency converter as function of the external resistor RSF and IRSF as function of converter frequency. As above mentioned the converter oscillator spread parameters (dither effect) are adjustable via SPI. Dither effect is disabled by default during standalone operation, but it is possible enabling it simply connecting the SDI pin to 5 V voltage. Figure 11. Internal structure of main converter oscillator |
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