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BTN8962 データシート(PDF) 77 Page - Infineon Technologies AG |
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BTN8962 データシート(HTML) 77 Page - Infineon Technologies AG |
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77 / 94 page  Figure 83 The spread of the output duty cycle caused by process variation, RLOAD = 2 Ω, ILOAD = 37 µH, f = 20 kHz, for BTN8962TA The blue curve shows one output duty cycle based on the measurement of one BTN8962TA. When DCIN*T is lower than the total rising time, the MOSFET is not switched on, and the output duty cycle will be 0%. If the (1 - DCIN) * T is lower than the total falling time, the MOSFET can not be switched off, and the output duty cycle will be 100%. A and B are the saturation points for the measured device. All DCIN lower than saturation point A or higher than saturation point B will generate a DC voltage at output. The purple curve indicates the estimated worst case of the output duty cycle. In this extreme scenario, the range of the output duty cycle is calculated by using the maximum tdr(HS) and tdf(HS) in the datasheet. 5.7.2 Output duty cycle improvement methods For high end applications, output duty cycle improvement methods are highly recommended to improve the precision of the DCOUT. It can be implemented in two different improvement methods: by performing end of the line calibration or an output duty cycle control loop. • End of the line calibration: This method requires the measurement of some typical and predefined testing points(several DCIN) for each device. The set of the measurement data or a parameter set can be stored in a microctroller. Based on the data set, a proper input duty cycle could be selected by using curve fitting or interpolation to generate an expected output duty cycle. • Output duty cycle control loop: It is a real time operation. Instead of measuring the predefined test points once, the output duty cycle is measured by the microcontroller during the operation continuously as shown in Figure 84. The input duty cycle then is adapted accordingly by a control algorithm(e.g. PID- controller), to equal the value of a desired output duty cycle set-point. This real time calibration method BTN8960 /62 /80 /82 High Current PN Half Bridge Switching Timing Application Note 77 Rev. 0.6 2017-02-21 |
同様の部品番号 - BTN8962 |
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同様の説明 - BTN8962 |
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