AMC1306E05_017 Datasheet, PDF (32/38 Pages) Texas Instruments – Small, High-Precision, Reinforced Isolated Delta-Sigma Modulators with High CMTI

AMC1306E05, AMC1306E25, AMC1306M05, AMC1306M25
SBAS734A – MARCH 2017 – REVISED JULY 2017
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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 61) 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.
Floating
Power Supply
HV+
20 V
To Load
RSHUNT
Gate Driver
Z1
1N751A
R1
800
C1
10 F
AMC1306Mx
5.1 V
AVDD
DVDD
C2
0.1 F
C4
0.1 F
AGND
DGND
C5
2.2 F
3.0 V,
3.3 V,
or 5.0 V
AINN
DOUT
SD-Dx
Gate Driver
AINP
CLKIN
SD-Cx
PWMx
TMS320F2837x
HV-
Copyright © 2017, Texas Instruments Incorporated
Figure 61. Decoupling the AMC1306
32
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