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| DRV8848_16 Datasheet, PDF (16/27 Pages) Texas Instruments – Dual H-Bridge Motor Driver | |||
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DRV8848
SLLSEL7A â OCTOBER 2014 â REVISED NOVEMBER 2015
www.ti.com
8.2.2 Detailed Design Procedure
8.2.2.1 Current Regulation
The chopping current (ICHOP) is the maximum current driven through either winding. This quantity depends on the
sense resistor value (RXISEN).
ICHOP
VVREF
6.6 u RXISEN
(2)
ICHOP is set by a comparator which compares the voltage across RXISEN to a reference voltage. Note that ICHOP
must follow Equation 3 to avoid saturating the motor.
ICHOP (A)
RL (:)
VVM (V)
2 u RDS(ON) (:)
RXISEN (:)
where
⢠VVM is the motor supply voltage.
⢠RL is the motor winding resistance.
(3)
8.2.3 Application Curves
AIN1
Current trip point
Fast decay
AIN2
Slow decay
I Motor
Figure 11. Current Regulation
Figure 12. Stepper Mode Operation
16
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