DRV5023FAQDBZR datasheet(17/32 Pages) TI2

17 / 32 page

Frequency (Hz)

100

1000

10000

100000

-14

-12

-10

-8

-6

-4

-2

D011

OUT

10 kHz

S u

R1 C2

S u

3.4 V

3.2 V

30 mA

100 µA

ref

max

min

30 mA

100 µA

DRV5023

www.ti.com

SLIS151G – MAY 2014 – REVISED SEPTEMBER 2016

Product Folder Links: DRV5023

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8.2.1.2.1

Configuration Example

In a 3.3-V system, 3.2 V

≤ Vref ≤ 3.4 V. Use Equation 3 to calculate the allowable range for R1.

(3)

For this design example, use Equation 4 to calculate the allowable range of R1.

(4)

Therefore:

113 Ω ≤ R1 ≤ 32 kΩ

(5)

After finding the allowable range of R1 (Equation 5), select a value between 500

Ω and 32 kΩ for R1.

Assuming a system bandwidth of 10 kHz, use Equation 6 to calculate the value of C2.

(6)

For this design example, use Equation 7 to calculate the value of C2.

(7)

An R1 value of 10 k

Ω and a C2 value less than 820 pF satisfy the requirement for a 10-kHz system bandwidth.

A selection of R1 = 10 k

Ω and C2 = 680 pF would cause a low-pass filter with a corner frequency of 23.4 kHz.

8.2.1.3 Application Curves

R1 = 10-kΩ pullup

No C2

Figure 19. 10-kHz Switching Magnetic Field

R1 = 10-kΩ pullup

C2 = 680 pF

Figure 20. 10-kHz Switching Magnetic Field

R1 = 10-kΩ pullup

C2 = 680 pF

Figure 21. Low-Pass Filtering

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