DRV8834 Datasheet, PDF (10/30 Pages) Texas Instruments – DUAL BRIDGE STEPPER OR DC MOTOR DRIVER

DRV8834
SLVSB19A – FEBRUARY 2012 – REVISED MARCH 2012
xVM
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1
xOUT1
2
xOUT2
1 Drive Current
2 Fast decay
3 Slow decay
3
Figure 2. Decay Modes
The DRV8834 supports fast, slow, and also mixed decay modes. With DC motors, slow decay is nearly always
used to minimize current ripple and optimize speed control; with stepper motors, the decay mode is chosen for a
given stepper motor and operating conditions to minimize mechanical noise and vibration.
In mixed decay mode, the current recirculation begins as fast decay, but at a fixed period of time (determined by
the state of the xDECAY pins shown in Table 2) switches to slow decay mode for the remainder of the fixed
PWM period.
RESISTANCE ON xDECAY PIN
< 1 kΩ
20 kΩ ±5%
50 kΩ ±5%
100 kΩ ±5%
kΩ
Table 2. Decay Pin Configuration
-OR- VOLTAGE FORCED ON xDECAY PIN
< 0.1 V
0.2 V ±5%
0.5 V ±5%
1 V ±5%
>2V
% OF PWM CYCLE IS FAST DECAY
0%
25%
50%
75%
100%
10
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