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データシートサーチシステム |
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データシートサーチシステム |
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BTN8962 データシート(PDF) 13 Page - Infineon Technologies AG |
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BTN8962 データシート(HTML) 13 Page - Infineon Technologies AG |
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13 / 94 page  CDC − link ≥ ΔP ⋅ TPWM VS,DC ⋅ ΔVS Equation 10 Based on Equation 2 and referring to the energy of on single pulse, as marked with Epulse (≈ ΔP • TPWM) in Figure 7: ΔP = VS ⋅ Inom ≈ VS ⋅ IOUT,min + 1 2 ΔIOUT Equation 11 The DC-link capacitor is primarily the energy buffer for the switching process of the PWM motor control. Secondly it is part of the Pi-filter. This means first the DC-link capacitor must be calculated according to Equation 10. Based on this, it is recommended that the second capacitor of the Pi-filter C1 be estimated with: C1 = 1 10 ⋅ CDC − link = 1 10 ⋅ C10 Equation 12 Generally the border frequency of the L1-C1-filter is determined with fg = 1 2 ⋅ Π ⋅ L1 ⋅ C1 Equation 13 We recommend setting the border frequency fg to half the value of the PWM -frequency fPWM. fg = 1 2 ⋅ f PWM = 1 2 ⋅ Π ⋅ L1 ⋅ C1 Equation 14 L1 = 1 Π2 ⋅ fPWM 2 ⋅ C 1 Equation 15 Summary 1. Calculate the DC-link capacitor with Equation 10. 2. Calculate the other capacitor of the Pi-filter with Equation 12. 3. Calculate the inductor of the Pi-filter with Equation 15. 4. Do not forget the important layout rules and how to measure the supply voltage correctly. 3.2.2 Undervoltage toggling The power supply cable of most modules in a car are several meters long. The longer the supply cable is, the higher its parasitic inductance. In addition, most modules have a Pi-filter at the supply line with a inductor for EMC reasons. The sum of the supply line inductances have a significant influence on the Vs-voltage. When switching the motor ON during a normal motor start or PWM control, with a insufficient DC-link capacitor the supply voltage drops below the undervoltage threshold and the NovalithIC™ is switched to tristate. The supply BTN8960 /62 /80 /82 High Current PN Half Bridge Design Guideline Application Note 13 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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