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UM1556 Datasheet(PDF) 52 Page - STMicroelectronics |
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UM1556 Datasheet(HTML) 52 Page - STMicroelectronics |
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52 / 87 page  Switching inductive loads UM1556 52/87 Doc ID 023520 Rev 2 4.4.2 Component selection guide for external transil-diode clamping This chapter shows how to select proper a diode (D) and transil (T) for external clamping circuitry 1). Figure 42. External clamping - transil and diode Transil selection ● Clamping voltage, V/A characteristic Table 11. External clamping circuitry examples (2/2) External clamping circuitry + – 4) Freewheeling diode and reverse battery FET Load is reverse battery protected Low peak power dissipation on D during demag. phase (suitable for high current inductive loads such as DC motors) High number of ext. components (cost) Slow demagnetization L R Vbat GND OUT Rgnd Dgnd GND GND Clamp Iout GND D PMOS 4k7 15V GND L R Vbat GND OUT Rgnd Dgnd GND GND Clamp Vout Iout T D GND |
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