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A2918SWH Datasheet(PDF) 5 Page - Allegro MicroSystems |
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A2918SWH Datasheet(HTML) 5 Page - Allegro MicroSystems |
5 / 8 page 2918 DUAL FULL-BRIDGE PWM MOTOR DRIVER www.allegromicro.com LOAD CURRENT PATHS General To avoid excessive voltage spikes on the LOAD SUPPLY pin (VBB), a large-value capacitor ( ≥47 µF) should be connected from VBB to the ground pin as close as possible to the device. Under no circumstances should the voltage at VBB exceed 45 V. The PHASE input to each bridge determines the direction motor winding current flows. An internally generated deadtime, of approximately 3 µs, prevents crossover currents that can occur when switching the PHASE input. All four drivers in the bridge output can be turned OFF, with VEN ≥ 2.4, resulting in a fast current decay through the internal ground clamp and flyback diodes. The fast current decay is desirable in half-step and high-speed applications. The ENABLE input must be tied low if it is not used. Varying the reference voltage (VREF) provides continuous control of the peak load current. Thermal protection circuitry turns OFF all drivers when the junction temperature reaches approximately +170 °C. It is intended only to protect the device from failures due to excessive junction temperature and should not imply that output short circuits are permitted. The output drivers are re-enabled when the junction temperature cools to approximately +145 °C. Dwg. EP-006-1 R S BB V BRIDGE ON SOURCE OFF ALL OFF The products described here are manufactured in Japan by Sanken Electric Co., Ltd. for sale by Allegro MicroSystems, Inc. Sanken Electric Co., Ltd. and Allegro MicroSystems, Inc. reserve the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of their products. Therefore, the user is cautioned to verify that the information in this publication is current before placing any order. These products are not authorized for use as critical components in life-support appliances, devices, or systems without express written approval. The information included herein is believed to be accurate and reliable. However, Sanken Electric Co., Ltd. and Allegro MicroSystems, Inc. assume no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use. |
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