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SLA7050M 데이터시트(PDF) 8 Page - Allegro MicroSystems |
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8 / 12 page 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 SLA7050M UNIPOLAR STEPPER-MOTOR TRANSLATOR/PWM DRIVER 8 Motor Driver Applications Information (cont’d) Allowable avalanche energy Waveforms during avalanche breakdown given +25°C limits, which may be caused by internal heating during normal operation. These power MOSFET outputs feature an excellent combination of fast switching, ruggedized device design, low on resistance, and cost effectiveness. Avalanche energy capability. There is a surge voltage expected when the output MOSFET turns off, and this voltage may exceed the MOSFET breakdown voltage (V (BR)DS). However, the MOSFETs are avalanche type and as long as the energy (E (AV)), which is imposed on the MOSFET by the surge voltage, is less than the maximum allowable value, it is considered to be within its safe operating area. Note that the maximum allowable ava- lanche energy is reduced as a function of temperature. In application, the avalanche energy (E (AV)) dissipated by the MOSFET is approximated as E (AV) = VDS(AV) x 1/2 x ID x t Output circuit for avalanche energy calculations |
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