AMC1306M25 datasheet(28/45 Pages) TI2

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SD-D3

TMS320F28x7x

DC link

SHUNT

SD-C3

SD-D4

SD-C4

SHUNT

3.3 V

DOUT

CLKIN

DVDD

DGND

AGND

AINN

AINP

AVDD

AMC1306Mx

3.3 V

DVDD

DGND

AGND

AINN

AINP

AVDD

AMC1306Mx

3.3 V

DVDD

DGND

AGND

AINN

AINP

AVDD

AMC1306Mx

3.3 V

DVDD

DGND

AGND

AINN

AINP

AVDD

AMC1306Mx

3.3 V

Power Board

Motor

Control Board

PWMx

DOUT

CLKIN

DOUT

CLKIN

DOUT

CLKIN

SD-D1

SD-C1

SD-D2

SD-C2

CDCLVC1104

AMC1306E05, AMC1306E25, AMC1306M05, AMC1306M25

SBAS734C – MARCH 2017 – REVISED JANAURY 2020

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Product Folder Links: AMC1306E05 AMC1306E25 AMC1306M05 AMC1306M25

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9.2 Typical Applications

9.2.1 Frequency Inverter Application

Isolated ΔΣ modulators are being widely used in frequency inverter designs because of their high ac and dc

performance. Frequency inverters are critical parts of industrial motor drives, photovoltaic inverters (string and

central inverters), uninterruptible power supplies (UPS), electrical and hybrid electrical vehicles, and other

industrial applications.

Figure 56 shows a simplified schematics of the AMC1306Mx in a typical frequency inverter application as used in

industrial motor drives with shunt resistors (RSHUNT) used for current sensing. Depending on the system design,

either all three or only two motor phase currents are sensed.

The Manchester coded bitstream output of the AMC1306Ex minimizes the wiring efforts of the connection

between the power board and the control board; see Figure 57. This bitstream output also allows the clock to be

generated locally on the power board without the having to adjust the propagation delay time of each DOUT

connection to fulfill the setup and hold time requirements of the microcontroller.

In both examples, an additional fourth AMC1306 is used to support isolated voltage sensing of the dc link. This

high voltage is reduced using a high-impedance resistive divider and is sensed by the device across a smaller

resistor. The value of this resistor can degrade the performance of the measurement, as described in the Isolated

Voltage Sensing section.

Figure 56. The AMC1306Mx in a Frequency Inverter Application

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