DVDD

DGND

AGND

AINP

AINN

AVDD

AMC1306Mx

HV+

HV-

To Load

Floating

Power Supply

20 V

3.0 V,

3.3 V,

or 5.0 V

5.1 V

R1

800

Z1

1N751A

C1

10 F

C2

0.1 F

C4

0.1 F

C5

2.2 F

Gate Driver

Gate Driver

Copyright © 2017, Texas Instruments Incorporated

DOUT

CLKIN

SD-Cx

SD-Dx

TMS320F2837x

PWMx

29

AMC1306E05, AMC1306E25, AMC1306M05, AMC1306M25

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SBAS734 – MARCH 2017

Product Folder Links: AMC1306E05 AMC1306E25 AMC1306M05 AMC1306M25

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Copyright © 2017, Texas Instruments Incorporated

10 Power Supply Recommendations

In a typical frequency-inverter application, the high-side power supply (AVDD) for the device is directly derived

from the floating power supply of the upper gate driver. For lowest system-level cost, a Zener diode can be used

to limit the voltage to 5 V or 3.3 V (±10%). Alternatively a low-cost low-drop regulator (LDO), for example the

LM317-N, can be used to adjust the supply voltage level and minimize noise on the power-supply node. A low-

ESR decoupling capacitor of 0.1 µF is recommended for filtering this power-supply path. Place this capacitor (C2

in Figure 56) as close as possible to the AVDD pin of the AMC1306 for best performance. If better filtering is

required, an additional 10-µF capacitor can be used.

The floating ground reference (AGND) is derived from the end of the shunt resistor that is connected to the

negative input (AINN) of the device. If a four-pin shunt is used, the device inputs are connected to the inner leads

and AGND is connected to one of the outer leads of the shunt.

For decoupling of the digital power supply on the controller side, a 0.1-µF capacitor is recommended to be

placed as close to the DVDD pin of the AMC1306 as possible, followed by an additional capacitor in the range of

1 µF to 10 µF.

Figure 56. Decoupling the AMC1306