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AN993 数据表(PDF) 9 Page - STMicroelectronics |
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AN993 数据表(HTML) 9 Page - STMicroelectronics |
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9 / 27 page  AN993 Device block description Doc ID 5656 Rev 10 9/27 That is to say: Equation 2 After the preheating time, the capacitor Cpre is first quickly discharged and then recharged by the current Ifs, generating a second voltage ramp which feeds a transconductance amplifier, as shown in Figure 6 (the switch is closed). Thus, this voltage signal is converted into a growing current which is subtracted from Imax to produce the frequency shifting from fmax to fmin. The current that drives the oscillator to set the frequency during this shifting is equal to: Equation 3 Figure 5. Timing block Figure 6. Timing oscillator block AM01313v1 Cpre Ifs Ipre DISCHARGE AM01314v1 Cpre Imin Imax TIMING C S O m g Iosc |
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