A4931
3-Phase Brushless DC Motor Pre-Driver
Power-up and Standby Modes Timing Diagram
VBB
VBBUV
Charge
Pump
HBIAS
Voltage
Standby Mode
Turn off Hall
Bias Supply
3 ms
tdENB
ENB
Outputs Enabled
Outputs Disabled
Outputs Enabled
Power-up and Standby Modes Timing Diagram
VBB
VBBUV
VCPUV
VHBIAS
VBB+7.5 V
Charge
Pump
7.5V
HBIAS
Voltage
ENB
PWM
Outputs Enabled
Outputs Disabled
Allegro MicroSystems, Inc.
115 Northeast Cutoff
6
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com