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DRV8876PWPR Datasheet(PDF) 29 Page - Texas Instruments

Part # DRV8876PWPR
Description  DRV8876 H-Bridge Motor Driver With Integrated Current Sense and Regulation
PDF  51 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

DRV8876PWPR Datasheet(HTML) 29 Page - Texas Instruments

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DRV887x
EN/IN1
1
PH/IN2
2
nSLEEP
3
nFAULT
4
VREF
5
IPROPI
6
IMODE
7
OUT1
8
PMODE
16
GND
15
CPL
14
CPH
13
VCP
12
VM
11
OUT2
10
PGND
9
Thermal
Pad
BDC
Controller
PWM
PWM
I/O
I/O
ADC
0.1 …F
C
Bulk
V
M
0.1 …F
0.022 …F
10 k
V
CC
R
IPROPI
V
CC
V
CC
X
BDC
V
M
V
M
29
DRV8876
www.ti.com
SLVSDS7B – AUGUST 2019 – REVISED NOVEMBER 2019
Submit Documentation Feedback
Copyright © 2019, Texas Instruments Incorporated
Figure 37. Typical Application Schematic
8.2.2.1 Design Requirements
Table 11. Design Parameters
REFERENCE
DESIGN PARAMETER
EXAMPLE VALUE
VM
Motor and driver supply voltage
24 V
VCC
Controller supply voltage
3.3 V
IRMS1
Output 1 RMS current
0.5 A
IPEAK1
Output 1 peak current
1 A
IRMS2
Output 2 RMS current
0.25 A
IPEAK2
Output 2 peak current
0.5 A
fPWM
Switching frequency
20 kHz
AIPROPI
Current sense scaling factor
1000 µA/A
RIPROPI
IPROPI external resistor
2.2 kΩ
VADC
Controller ADC reference voltage
3.3 V
TA
PCB ambient temperature
–20 to 85 °C
TJ
Device max junction temperature
150 °C
RθJA
Device junction to ambient thermal resistance
35 °C/W
8.2.2.2 Detailed Design Procedure
Refer to the Primary Application Detailed Design Procedure section for a detailed design procedure example.
The majority of the design concepts apply to the alternative application example. A few changes to the procedure
are outlined below.
8.2.2.2.1
Current Sense and Regulation
In the alternative application for two half-bridge loads, the IPROPI output will be the combination of the two
outputs currents. The current sense feedback resistor RIPROPI should be scaled appropriately to stay within the
dynamic voltage range of the controller ADC. An example of this is shown
RIPROPI <= VADC / ((IPEAK1 + IPEAK2) x AIPROPI)
(23)
RIPROPI = 2.2 kΩ <= 3.3 V / ((1 A + 0.5 A) x 1000 µA/A)
(24)



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