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 mm
2
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A4915 Features
Wide Supply Voltage Range
5.0 V to 50 V
1uA Standby Current
Center aligned PWM reduces power losses
Fault Output
Latched Thermal Shutdown
Active Low Brake (normally active)
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
Datasheet Download
Extended Battery life
Designed For Safety
Easy to Control and Flexible
Small Thermally Efficient Packaging
Offered in Leadless and Leaded Options with Exposed Pad
Easy to Control with SPEED or ENABLE Pins
Option 1
Speed Input - Analog voltage on speed input is converted to output duty cycle
SPEED Pin
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100
Output Duty
Cycle Т
on
/ Т (%)
80
60
40
20
0
0
SPEED Input Characteristic
OR
Voltage
SPEED Pin
AND
DIRECTION
DIRECTION Pin
20
40
60
V
SPEED
/ VDD (%)
80
100
Option 2
Enable Input – Traditional PWM input
ENABLE Pin
Enable Input Characteristic
Enable Duty Cycle
(%)
100
80
60
40
20
0
0
20
40
60
Output Duty Cycle (%)
80
100
ENABLE
DIRECTION
DIRECTION Pin
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