LMP8481MM-SSLASHNOPB datasheet(13/24 Pages) TI

13 / 24 page

VREF

100 k:

VREFA

VREFB

100 k:

(6V Max)

-0.1 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7

VSENSE (V)

VCC> 14V

VREF= 1.2V

VCC = +4.5V to +76V

0.1 PF

VOUT

To Load

RSENSE

ISENSE

ADC

RSN

RSP

REFA

REFB

GND

LMP8481

LM4140ACM-1.2

VIN+

VIN-

VREF

0.1 PF

VSENSE

LMP8480, LMP8481

www.ti.com

SNVS829A – JUNE 2012 – REVISED AUGUST 2012

Figure 10. Bi-Directional current sensing using LMP8481

The VREFA and VREFB pins set the zero reference point. The output “zero” reference point is set by applying a

voltage to the REFA and/or REFB pins. See the BI-DIRECTIONAL OPERATION (LMP8481 ONLY) section

below. REFA AND REFB PINS (LMP8481 Only) below shows the output transfer function with a 1.2V reference

applied to the Gain-of-20 option

Figure 11. Bi-Directional Transfer Function using 1.2V Reference Voltage

REFA AND REFB PINS (LMP8481 Only)

The voltage applied to the VREFA and VREFB pins controls the output zero reference level.

The reference inputs consist of a pair of divider resistors with equal values to a common summing point, VREF’,

as shown in Figure 16 below.

Figure 12. VREF Input Resistor Network

VREF’ is the voltage at the resistor tap point that will be directly applied to the output as an offset.

VOUT = ( (VRSP – VRSN) * Av ) + VREF’

(2)

Where:

VREF’ = VREFA = VREFB (Equal Inputs)

(3)

(4)

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