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L9680 数据表(PDF) 43 Page - STMicroelectronics |
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L9680 数据表(HTML) 43 Page - STMicroelectronics |
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43 / 286 page  DS11615 Rev 7 43/286 L9680 Start-up and power control 285 The user can decide the charge and discharge time based on the ER CAP used in application, in order to maximize the differential voltage and then improve the accuracy. Anyway, a timeout on ER Discharge current has been implemented to prevent thermal issue, so the discharge time cannot be longer than 350 ms. Figure 17. ER CAP measurement timing diagram The following formulas can be used to retrieve the ER CAP value from the voltage and timing measurements. T1 = discharge time T2 = charge time, same as discharge time T1 = T2 = T V1 = Vstart - Vstop V2 = Vend - Vstop I1 = discharge current I2 = charge current, same as discharge current I1 = I2 = I ILEAK = leakage current V1 V2 + I1 ILEAK + C ---------------------------T1 I2 ILEAK – C --------------------------T2 + = C 2 I T Vstart Vend 2 Vstop – + ---------------------------------------------------------------- = ESR > 0 VER (t) ER_DISCHARGE ER_CHARGE ESR = 0 Vstart Vstop Vend T1 T2 GAPGPS02262 |
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