The Allegro A4915 Three-Phase MOSFET Driver’s innovative speed input and
fully integrated block commutation delivers simple speed control of a
BLDC motor with a single analog voltage. Presented by Dan Jacques,
Strategic Marketing Manager, Motor Driver ICs.
The A4915 is designed for pulse width modulated (PWM) current control of 3-phase brushless DC motors. The A4915 is capable of high current gate drive for 6 all N-channel power MOSFETs. An internal charge pump ensures gate drive down to 7 V supply and provides limited gate drive down to 5 V. A bootstrap capacitor is used to generate a supply voltage greater than the source voltage of the high side MOSFET, required for N-channel MOSFETs.
Internal synchronous rectification control circuitry is provided to improve power dissipation in the external MOSFETs during PWM operation. Internal circuit protection includes latched thermal shutdown, dead time protection, and undervoltage lockout. Special power up sequencing is not required.
The A4915 is supplied in a 28-pin TSSOP with an exposed thermal pad (suffix LP) and a 28-contact 5 × 5 mm QFN with an exposed thermal pad (suffix ET). These packages are lead (Pd) free, with 100% matte-tin leadframe plating.
To learn more about Allegro's A4915, click on the link below:
http://www.eeweb.com/company-blog/allegro_microsystems/allegro-a4915-demo-board/
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