DRV8839_16 Datasheet, PDF (13/25 Pages) Texas Instruments – Low-Voltage Dual H-Bridge Driver IC

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DRV8839
SLVSBN4B – JANUARY 2013 – REVISED DECEMBER 2015
8.2.2 Detailed Design Procedure
The following design procedure can be used to configure the DRV8839 in a brushed motor application.
8.2.2.1 Motor Voltage
The appropriate motor voltage depends on the ratings of the motor selected and the desired RPM. A higher
voltage spins a brushed DC motor faster with the same PWM duty cycle applied to the power FETs. A higher
voltage also increases the rate of current change through the inductive motor windings.
8.2.2.2 Low-Power Operation
When entering sleep mode, TI recommends setting all inputs as a logic low to minimize system power.
8.2.2.3 Application Curves
The following scope captures show a typical motor startup and running. Channel 1 is VM, Channel 2 is IN1,
Channel 3 is IN2, and Channel 4 is motor current. the motor used is a NMB Technologies, PPN7PA12C1.
Figure 10. Motor Startup With VCC = 3.3 V, VM = 5 V
Figure 11. Motor Running With VCC = 3.3 V, VM = 5 V
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