DRV8701_15 Datasheet, PDF (4/42 Pages) Texas Instruments – DRV8701 Brushed DC Motor Full-Bridge Gate Driver

DRV8701
SLVSCX5B – MARCH 2015 – REVISED JULY 2015
www.ti.com
PIN
NAME
NO.
VREF
6
nFAULT
9
SNSOUT
10
SO
11
SN
20
SP
21
GH1
17
GH2
24
GL1
19
GL2
22
SH1
18
SH2
23
Common Pins (continued)
TYPE
DESCRIPTION
Input
Open
Drain
Open
Drain
Output
Input
Input
Analog reference input
Fault indication pin
Sense comparator output
Shunt amplifier output
Shunt amplifier negative input
Shunt amplifier positive input
Controls the current regulation; apply a voltage between 0.3 V and
AVDD
Pulled logic low with fault condition; open-drain output requires an
external pullup
Pulled logic low when the drive current hits the current chopping
threshold; open-drain output requires an external pullup
Voltage on this pin is equal to the SP voltage times A_V plus an
offset; place no more than 1 nF of capacitance on this pin
Connect to SP through current sense resistor and to GND
Connect to low-side FET source and to SN through current sense
resistor
Output High-side gate
Connect to high-side FET gate
Output Low-side gate
Connect to low-side FET gate
Input Phase node
Connect to high-side FET source and low-side FET drain
External Passive Components
COMPONENT
PIN 1
PIN 2
RECOMMENDED
C_VM1
C_VM2
C_VCP
C_SW
C_DVDD
C_AVDD
R_IDRIVE
R_nFAULT
R_SNSOUT
R_SENSE
VM
VM
VCP
CPH
DVDD
AVDD
IDRIVE
VCC ⁽¹⁾
VCC ⁽¹⁾
SP
GND
GND
VM
CPL
GND
GND
GND
nFAULT
SNSOUT
SN/GND
0.1-µF ceramic capacitor rated for VM
≥10-µF capacitor rated for VM
16-V, 1-µF ceramic capacitor
0.1-µF X7R capacitor rated for VM
6.3-V, 1-µF ceramic capacitor
6.3-V, 1-µF ceramic capacitor
See Typical Applications for resistor sizing
≥10-kΩ pullup
≥10-kΩ pullup
Optional low-side sense resistor
(1) VCC is not a pin on the DRV8701, but a VCC supply voltage pullup is required for open-drain outputs nFAULT and SNSOUT. The
system controller supply can be used for this pullup voltage, or these pins can be pulled up to either AVDD or DVDD.
Component
Q_HS1
Q_LS1
Q_HS2
Q_LS2
Gate
GH1
GL1
GH2
GL2
Drain
VM
SH1
VM
SH2
External FETs
Source
SH1
SP or GND
SH2
SP or GND
Recommended
Supports up to 200-nC FETs at 40-kHz PWM; see
Detailed Design Procedure for more details
4
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