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BTN8962 データシート(PDF) 11 Page - Infineon Technologies AG |
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BTN8962 データシート(HTML) 11 Page - Infineon Technologies AG |
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11 / 94 page  • C_IS: Ceramic capacitor for EMI improvement. GND connection with at least two GND-vias. A good value is 1 nF. In case the current should be measured during the PWM-phase, this capacitor must be adapted to the ON-time inside the PWM-phase. • R1 and R2: Device protection in case of µC pins shorted to Vs. 3.2 DC-link capacitor For the stability of the DC-link voltage a sufficient capacitor is mandatory (in Figure 2, Figure 3 and Figure 5 it is C10). This is one of the most important component in a motor design with semiconductor switches. The DC-link capacitor could be insufficient, because: • The capacitor value is too small. • The ESR of the capacitor is too high. • When cold the capacitor value is too small. • The distance between the DC-link capacitor and the NovalithIC™ is too large. • The wiring between the DC-link capacitor and the NovalithIC™ is too long (see Chapter 2). The value must be chosen carefully, taking the undervoltage toggling into account, which is described in Chapter 3.2.2. 3.2.1 Calculation of the DC-link capacitor and Pi-filter As already mentioned in the design- and layout-rules of Figure 5 the voltage ripple at the NovalithIC™Vs-pin must not exceed 1 V peak-to-peak. The necessary DC-link capacitor can be estimated in the following way: Motor control with PWM means for the DC-link voltage to provide energy pulses during the “ON-phase” of the PWM cycle. The DC-link pulses are shown in Figure 7. This energy must be provided by the DC-link capacitor. This can generally be described with E = 1 2 ⋅ C ⋅ V 2 = P ⋅ T Equation 2 C = CDC − link Equation 3 The voltage at the DC-link capacitor consists of the DC-part and the delta voltage from the supply ripple: V = VS,DC + ΔVS Equation 4 The total power in this system consists of the DC-power plus the power of the energy pulse (Epulse), which provides the energy to the motor during the ON-phase of the half bridge. P = PDC + ΔP Equation 5 The maximum pulse length is determined by the PWM frequency, theoretically at a duty cycle of 100%: BTN8960 /62 /80 /82 High Current PN Half Bridge Design Guideline Application Note 11 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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