OrderableDevice datasheet(28/76 Pages) TI1

28 / 76 page

0.2

0.4

0.6

0.8

LOAD (A)

C219

Gain

OUT MAX

OUT MIN

IN MAX

IN MIN

Gain

SHUNT MAX

SHUNT

LOAD MAX

100mV

100m

OUT

LOAD

SHUNT

Gain

TLV9051, TLV9052, TLV9054

SBOS942F – AUGUST 2018 – REVISED JUNE 2019

www.ti.com

Product Folder Links: TLV9051 TLV9052 TLV9054

Submit Documentation Feedback

Typical Low-Side Current Sense Application (continued)

9.2.2 Detailed Design Procedure

The transfer function of the circuit in Figure 41 is given in Equation 1.

(1)

The load current (ILOAD) produces a voltage drop across the shunt resistor (RSHUNT). The load current is set from

0 A to 1 A. To keep the shunt voltage below 100 mV at maximum load current, the largest shunt resistor is

defined using Equation 2.

(2)

Using Equation 2, RSHUNT equals 100 mΩ. The voltage drop produced by ILOAD and RSHUNT is amplified by the

TLV905x device to produce an output voltage of approximately 0 V to 4.95 V. Equation 3 calculates the gain

required for the TLV905x device to produce the required output voltage.

(3)

Using Equation 3, the required gain equals 49.5 V/V, which is set with the RF and RG resistors. Equation 4 sizes

the RF and RG, resistors to set the gain of the TLV905x device to 49.5 V/V.

(4)

Selecting RF to equal 165 kΩ and RG to equal 3.4 kΩ provides a combination that equals approximately 49.5

V/V. Figure 42 shows the measured transfer function of the circuit shown in Figure 41.

9.2.3 Application Curve

Figure 42. Low-Side, Current-Sense Transfer Function

OrderableDevice Scheda tecnica(PDF) 28 Page - Texas Instruments

OrderableDevice Scheda tecnica(HTML) 28 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76

Scheda tecnica Scarica

Link URL