A4915 Cost Effective BLDC System Controller Simplifies Consumer and Industrial Designs April 2013 Allegro Confidential Information What Is It? The A4915 drives a BLDC motor without a microprocessor or DSP Improves time to market by eliminating complicated software development Its powerful gate drive can support up to 150 A load current over a wide operating voltage range Capable of driving wide range of motors 50 V maximum rating for operation with wide range of input voltages. 5 V minimum supply rating is ideal for battery operated applications SLEEP function provides 10uA standby current Center Aligned PWM improved thermal management and noise reduction Integrated brake feature for safety critical applications The A4915 Simplifies Designs Existing Solution Allegro Confidential Information Allegro Solution And Saves Space Save 75% 750 mm2 Allegro Confidential Information A4915 Features Wide Supply Voltage Range 5.0 V to 50 V Extended Battery life 1uA Standby Current Center aligned PWM reduces power losses Designed For Safety Fault Output Latched Thermal Shutdown Active Low Brake (normally active) Easy to Control and Flexible Single Wire SPEED Input Converts Voltage to PWM Duty Direct PWM via ENABLE Pin Hall Commutation Table On-Chip Optional DIRECTION and BRAKE Inputs Dead-time adjustment allows operation with various MOSFETs Product Webpage Small Thermally Efficient Packaging Offered in Leadless and Leaded Options with Exposed Pad Datasheet Download Easy to Control with SPEED or ENABLE Pins Allegro Confidential Information Option 1 Speed Input - Analog voltage on speed input is converted to output duty cycle SPEED Pin Voltage SPEED Pin AND DIRECTION Output Duty Cycle Тon / Т (%) OR SPEED Input Characteristic 100 80 60 40 20 0 0 DIRECTION Pin Option 2 DIRECTION Pin Enable Duty Cycle (%) DIRECTION ENABLE Pin 40 60 VSPEED / VDD (%) 80 100 Enable Input Characteristic Enable Input – Traditional PWM input ENABLE 20 100 80 60 40 20 0 0 20 40 60 Output Duty Cycle (%) 80 100 Design Tools and Application Support Allegro Confidential Information A4915METTR-T A4915MLPTR-T Evaluation Kit PNs: 28L QFN APEK4915EET-01-T 28L TSSOP APEK4915ELP-01-T Spin a motor in minutes with evaluation kits available for purchase on Allegro’s Storefront Samples available from Allegro sales Get Technical Support Allegro Confidential Information Visit Allegromicro.com for datasheets, samples and evaluation kits. Visit www.allegromicro.com