TLV914X datasheet(27/46 Pages) TI

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7 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

7.1 Application Information

The TLV914x family offers excellent DC precision and AC performance. These devices operate up to 18V supply

rails and offer true rail-to-rail input and output, low offset voltage and offset voltage drift, as well as 125kHz

bandwidth and high output drive. These features make the TLV914x a robust, high-performance operational

amplifier for high-voltage industrial applications.

7.2 Typical Applications

7.2.1 Low-Side Current Measurement

Figure 7-1 shows the TLV9141 configured in a low-side current sensing application. For a full analysis of the

circuit shown in Figure 7-1 including theory, calculations, simulations, and measured data, see TI Precision

Design TIPD129, 0A to 1A Single-Supply Low-Side Current-Sensing Solution.

–

120

LOAD

5.76 k

LM7705

5 V

OUT

SHUNT

100 m

Figure 7-1. TLV914x in a Low-Side, Current-Sensing Application

7.2.1.1 Design Requirements

The design requirements for this design are as follows:

• Load current: 0A to 1A

• Max output voltage: 4.9V

• Maximum shunt voltage: 100mV

7.2.1.2 Detailed Design Procedure

The transfer function of the circuit in Figure 7-1 is given in Equation 1:

VOUT =ILOAD × RSHUNT × Gain

(1)

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TLV914X Datasheet(PDF) 27 Page - Texas Instruments