DRV8701_15 Datasheet, PDF (28/42 Pages) Texas Instruments – DRV8701 Brushed DC Motor Full-Bridge Gate Driver

DRV8701
SLVSCX5B – MARCH 2015 – REVISED JULY 2015
8 Application and Implementation
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NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The DRV8701 is used in brushed-DC, solenoid, or relay control.
8.2 Typical Applications
8.2.1 Brushed-DC Motor Control
The following design procedure can be used to configure the DRV8701.
0.1 µF 1 µF
VM
R1
R2
VM
+
0.1 µF
Bulk
7
24
AVDD
GH2
1 µF
8
DVDD
23
SH2
1 µF
10 kŸ
10 kŸ
9
nFAULT
10
SNSOUT
GND
(PPAD)
22
GL2
21
SP
50 mŸ
11
20
BDC
SO
SN
12
19
IDRIVE
GL1
33 kŸ
VM
Figure 34. Typical Application Schematic
8.2.1.1 Design Requirements
Table 10 gives design input parameters for system design.
Table 10. Design Parameters
Design Parameter
Nominal supply voltage
Supply voltage range
FET total gate charge⁽¹⁾
FET gate-to-drain charge⁽¹⁾
Target FET gate rise time
Motor current chopping level
Reference
VM
VM_MIN, VM_MAX
Q_G
Q_GD
RT
I_CHOP
(1) FET part number is CSD88537ND.
Example Value
18 V
12 to 24 V
14 nC (typically)
2.3 nC (typically)
100 to 300 ns
3A
28
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