A4915: Cost Effective BLDC System Controller Simplifies Consumer and Industrial Designs

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
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Allegro Solution
And Saves Space
Save 75% 750 mm2
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A4915 Features
Wide Supply Voltage Range

5.0 V to 50 V
Extended Battery life
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1uA Standby Current
Center aligned PWM reduces power losses
Designed For Safety
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Fault Output
Latched Thermal Shutdown
Active Low Brake (normally active)
Easy to Control and Flexible
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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
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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
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Visit Allegromicro.com for datasheets,
samples and evaluation kits.
Visit www.allegromicro.com
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