April 2013
A4915
Cost Effective BLDC System Controller
Simplifies Consumer and Industrial Designs
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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
What Is It?
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The A4915 Simplifies Designs
Existing Solution Allegro Solution
Save 75% 750 mm2
And Saves Space
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Product Webpage Datasheet Download
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
A4915 Features
Small Thermally Efficient Packaging
Offered in Leadless and Leaded Options with Exposed Pad
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0
20
40
60
80
100
0 20 40 60 80 100
Output Duty
Cycle Тon / Т (%)
VSPEED / VDD (%)
SPEED Input Characteristic
SPEED Pin
SPEED Pin
OR
Voltage
0
20
40
60
80
100
0 20 40 60 80 100
Output Duty Cycle (%)
Enable Duty Cycle
(%)
ENABLE
DIRECTION
Enable Input Characteristic
ENABLE Pin
DIRECTION Pin
Easy to Control with SPEED or ENABLE Pins
AND
DIRECTION Pin
DIRECTION
Option 1
Speed Input - Analog voltage on speed input is converted to output duty cycle
Option 2
Enable Input – Traditional PWM input
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Design Tools and Application Support
Spin a motor in minutes with evaluation kits
available for purchase on Allegro’s Storefront
Samples available from Allegro sales
Get Technical Support
Evaluation Kit PNs:
28L QFN APEK4915EET-01-T
28L TSSOP APEK4915ELP-01-T
A4915METTR-T
A4915MLPTR-T
