Differential Input Voltage (mV)

-50

-40

-30

-20

-10

0

10

20

30

40

50

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

D026

VOUTN

VIN

VOUTP

24

AMC1302-Q1

SBAS920 – OCTOBER 2018

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Copyright © 2018, Texas Instruments Incorporated

8.2.3 Application Curves

In traction inverter applications, the power switches must be protected in case of an overcurrent condition. To

allow for fast powering off of the system, a low delay caused by the isolated amplifier is required. Figure 54

shows the typical full-scale step response of the AMC1302-Q1. Consider the delay of the required window

comparator and the MCU to calculate the overall response time of the system.

Figure 54. Step Response of the AMC1302-Q1

The high linearity and low temperature drift of the offset and gain errors of the AMC1302-Q1 (see the Typical

Characteristics section) allows design of motor drives with low torque ripple.

Figure 55. Typical Nonlinearity of the AMC1302-Q1

8.3 What to Do and What Not to Do

Do not leave the inputs of the AMC1302-Q1 unconnected (floating) when the device is powered up. If both

device inputs are left floating, the input bias current drives these inputs to the output common-mode of the

analog front-end of approximately 2 V. If the high-side supply voltage VDD1 is below 4 V, the internal common-

mode overvoltage detector turns on and the output functions as described in the Fail-Safe Output section, which

may lead to an undesired reaction on the system level.