DRV3201-Q1_16 Datasheet, PDF (47/60 Pages) Texas Instruments – DRV3201-Q1 3 Phase Motor Driver-IC for Automotive Safety Applications

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Typical Application (continued)
8.2.3 Current Sense
External
Reference
Voltage
DRV3201-Q1
SLVSBD6D – MAY 2012 – REVISED AUGUST 2015
RI
+
í
AGND
Internal
External
Application Setting Example:
Gain A1 = 20
R1 = 250
R2 = 5k
2 Channels
RO
VShift = 0.1 to 2.5V
I_IN
R1
R1
PGND
O1,2
O3,4
ADREF
Clamp
+
í ₁st _Stage
R2
+
í ₂^nd _Stage
External resistor network for
higher flexibility (A1 = 5 to 20V/V)
SPI Programmable Gain
A2 = 2, 4, 6, 8V/V
Figure 35. Application Circuit for Current Sense
8.2.3.1 Design Requirements
For more information, see Section 8.2.1.1.
8.2.3.2 Detailed Design Procedure
The output voltage at O1/2 is:
O_{1/ 2}
=
IR_S
R₂
R₁
+ V_RO
(9)
The output voltage at O3/4 is:
O_3/4 = g ´ (O_1/2 - V_RO ) + V_RO
where
• g is the SPI adjusted gain in the second stage.
(10)
For more information, see the Power Consumption and Boost Converter sections.
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