DRV8809 Datasheet, PDF (25/44 Pages) Texas Instruments – COMBINATION MOTOR DRIVERS WITH DC-DC CONVERTERS

DRV8809
DRV8810
www.ti.com ............................................................................................................................................................... SLVS854A – JULY 2008 – REVISED JULY 2008
Bipolar Current Regulated Stepper Motor Drive
The following functionality is common to all the H-bridge drives. A crossover delay is inherent to the control
circuitry to prevent cross conduction of the upper and lower switches on the same side of the H-bridge. A
blanking (deglitch) time is incorporated to prevent false triggering due to initial current spikes at turnon with a
discharged capacitive load.
The stepper motor current can be programmed to 16 different current levels using a 4-bit register. The average
current level for a particular angular rotation is shown in Table 14.
Enable
or Phase reversal
or Itrip detection
Sink or source
gate off to on
Sink or source
gate on to off
tPDON
tPDOFF
tCOD
Current sense
blanking time
tBLANK – DC motor blanking time
tab
Stepper blanking time
Figure 17. Crossover and Blanking Timing for H-Bridge
For stepper motor configured H-bridges, only tab (stepper blanking time) is set for current sensing. For DC
motor-configured H-bridges, tBLANK is included to ignore huge current spike due to rush current to varistor
capacitance.
Copyright © 2008, Texas Instruments Incorporated
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