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DRV8843PWP Datasheet(数据表) 8 Page - Texas Instruments

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部件型号  DRV8843PWP
说明  DUAL H-BRIDGE DRIVER IC
下载  19 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
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DRV8843PWP Datasheet(HTML) 8 Page - Texas Instruments

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xOUT1
xOUT2
1
2
3
Forward drive
Slow decay
Fast decay
VM
1
2
1
2
3
Reverse drive
Slow decay
Fast decay
xOUT1
xOUT2
3
VM
1
2
3
FORWARD
REVERSE
DRV8843
SLVSAS8A
– APRIL 2011 – REVISED MAY 2011
www.ti.com
Bridge Control
The AIN1 and AIN2 input pins directly control the state of the AOUT1 and AOUT2 outputs; similarly, the BIN1
and BIN2 input pins directly control the state of the BOUT1 and BOUT2 outputs. Either input can also be used
for PWM control of the load. Table 2 shows the logic.
Table 2. H-Bridge Logic
xIN1
xIN2
xOUT1
xOUT2
0
0
Z
Z
0
1
L
H
1
0
H
L
1
1
L
L
The inputs can also be used for PWM control of the motor speed. When controlling a winding with PWM, when
the drive current is interrupted, the inductive nature of the motor requires that the current must continue to flow.
This is called recirculation current. To handle this recirculation current, the H-bridge can operate in two different
states, fast decay or slow decay. In fast decay mode, the H-bridge is disabled and recirculation current flows
through the body diodes; in slow decay, the motor winding is shorted.
To PWM using fast decay, the PWM signal is applied to one xIN pin while the other is held low; to use slow
decay, one xIN pin is held high.
The control inputs have internal pulldown resistors of approximately 100 k
Ω.
Table 3. PWM Function
xIN1
xIN2
FUNCTION
PWM
0
Forward PWM, fast decay
1
PWM
Forward PWM, slow decay
0
PWM
Reverse PWM, fast decay
PWM
1
Reverse PWM, slow decay
The drawings below show the current paths in different drive and decay modes:
Figure 2. Current Paths
8
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Copyright
© 2011, Texas Instruments Incorporated
Product Folder Link(s): DRV8843




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