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BTN8962 データシート(PDF) 80 Page - Infineon Technologies AG |
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BTN8962 データシート(HTML) 80 Page - Infineon Technologies AG |
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80 / 94 page  6.3 Power dissipation due to switching With PWM control, switching losses need to be taken into account because they generate most of the power dissipation for high PWM frequencies. The NovalithICTM devices are designed to drive motors or other inductive loads. This chapter deals with switching losses that are generated while driving an inductive load. M Vs OUT GND VDS(HS) D S D S HS LS t IHS ILS VOUT t IOUT VDS(HS) VOUT IHS ILS ESL ESL VRon,act VBE ON_OFF OFF tHS-off tHS-off tSL1 tSL2 VRon,FW Figure 85 High-side switching scenario of BTN89xy The current in an inductor cannot be changed abruptly (rule of Lenz). As shown in Figure 85, the current in the high-side (HS) MOSFET is driven by the motor inductance as long as the OUT voltage drops one VBE below GND and the current is flowing through the body diode of the low-side (LS) MOSFET. This means that the current IHS is flowing in the high-side (HS) MOSFET, even though this is in linear mode during tHS-off. The NovalithICTM has a cross-current protection mechanism which ensures that an output MOSFET is turned on only when the other one is off. This causes a free wheeling current through the MOSFET body diode (VBE in Figure 85) before the resistive path is switched on. The power dissipation caused by the body diode is negligible and thus not taken into account in this estimation. The rise- and fall- time in the data sheet is the period during which the output voltage decreases from 80% to 20%. In order to determine the switching losses, we need to determine the time required to decrease the output voltage from 100% to 0%. The tHS-off can be estimated from the data sheet parameters with the Equation 46 accordingly. tHS − off = tf HS 0.5 Factor 0.5 is related to ΔVOUT from 0 % to 100 % Equation 46 For the other switching times (tHS-on, tLS-off and tLS-on) Equation 46 can be used to perform the same calculation using the corresponding data sheet parameters (tr(HS), tf(LS) and tr(LS)). Other assumptions, with a minor effect on the result, include the following: • The load current during the switching process is constant. • VOUT and VDS(HS) have linear behavior. • The switching times are assumed as equal and in the following always referred to as tHS-off. The switching energy ESL is shown in Figure 85 and can be estimated using Equation 47 below: BTN8960 /62 /80 /82 High Current PN Half Bridge Power Dissipation Application Note 80 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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