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L6207 数据表(PDF) 28 Page - STMicroelectronics |
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L6207 数据表(HTML) 28 Page - STMicroelectronics |
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28 / 53 page  AN1762 APPLICATION NOTE 28/53 Figure 29. Maximum output current vs. selectable devices. 3.15.2 Power Dissipation Formulae for different sequences Figure 30 to Figure 33 are screenshots of a spreadsheet that helps calculating power dissipation in specified conditions (application and motor data), and estimates the resulting junction temperature for a given package and copper area available on the PCB [4]. The model assumes that the device is driving a two-phase bipolar stepper motor and that a PWM current control with slow decay recirculation technique is implemented (L6207 integrates the PWM controller); it considers pow- er dissipation during the on-time and the off-time, rise and fall time (when a phase change occurs) considering the operating sequence (Normal, Wave or Half Step Mode), the switching losses and the quiescent current pow- er dissipation. 0.50 1.00 1.50 2.00 2.50 3.00 Load Current [A] |
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