DRV8353FSRTAR datasheet(83/97 Pages) TI

83 / 97 page

9.2.2.1 Design Requirements

Table 9-4 lists the example design input parameters for system design.

Table 9-4. Design Parameters

EXAMPLE DESIGN PARAMETER

REFERENCE

EXAMPLE VALUE

Power supply voltage

VVM

12 V

Buck supply voltage

VVIN

48 V

MOSFET drain voltage

VVDRAIN

48 V

MOSFET part number

MOSFET

CSD19535KCS

MOSFET total gate charge

78 nC

PWM frequency

fPWM

20 kHz

Buck regulator output voltage

VVCC

12 V

Buck regulator output current

IVCC

150 mA

ADC reference voltage

VVREF

3.3 V

Winding sense current range

ISENSE

0 to 40 A

Motor RMS current

IRMS

28.3 A

Sense-resistor power rating

PSENSE

3 W

System ambient temperature

–20°C to +105°C

9.2.2.2 Detailed Design Procedure

9.2.2.2.1 Sense Amplifier Unidirectional Configuration

The sense amplifiers are configured to be unidirectional through the registers on SPI devices by writing a 0 to

the VREF_DIV bit.

The sense-amplifier gain and sense resistor values are selected based on the target current range, VREF,

sense-resistor power rating, and operating temperature range. In unidirectional operation of the sense amplifier,

use Equation 39 to calculate the approximate value of the dynamic range at the output.

VREF

0.25 V

0.5 V

(39)

Use Equation 40 to calculate the approximate value of the selected sense resistor.

SENSE

RMS

(40)

where

•

VREF

0.5 V

From Equation 39 and Equation 40, select a target gain setting based on the power rating of a target sense

resistor.

9.2.2.2.1.1 Sense-Amplifier Example

In this system example, the value of VVREF is 3.3 V with a sense current from 0 to 40 A. The linear range of the

SOx output for the DRV8353x device is 0.25 V to VVREF – 0.25 V (from the VLINEAR specification). The differential

range of the sense-amplifier input is –0.3 to +0.3 V (VDIFF).

3.3 V

0.5 V

2.8 V

(41)

2.8 V

3 W

28.3

3.75 m

40 A

(42)

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DRV8350F, DRV8353F, DRV8350RF, DRV8353RF

SLVSFV1 – SEPTEMBER 2020

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