AMC1303E0510 Datasheet, PDF (29/40 Pages) Texas Instruments – Small, High-Precision, Reinforced Isolated Delta-Sigma Modulators with Internal Clock

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AMC1303E0510, AMC1303M0510, AMC1303E0520, AMC1303M0520
AMC1303E2510, AMC1303M2510, AMC1303E2520, AMC1303M2520
SBAS771 – JUNE 2017
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 52) as close as possible to the AVDD pin of the AMC1303 for best performance. Further, an additional
capacitor with a value in the range of 2.2 µF to 10 µF is recommended.
The floating ground reference (AGND) is derived from the end of the shunt resistor, which 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, TI recommends using a 0.1-µF capacitor
assembled as close to the DVDD pin of the AMC1303 as possible, followed by an additional capacitor in the
range of 2.2 µF to 10 µF.
Floating
Power Supply
HV+
20 V
To Load
RSHUNT
Gate Driver
Z1
1N751A
R1
800
C1
2.2 F
AMC1303Mx
5.1 V
AVDD
C2
0.1 F
AGND
DVDD
DGND
C4
0.1 F
C5
2.2 F
3.0 V,
or 3.3 V
or 5.0 V
AINN
DOUT
SD-Dx
Gate Driver
AINP
CLKOUT
SD-Cx
TMS320F2837x
Note: no CLKOUT connection using AMC1303Ex,
pin 7 to be connected to DGND in this case
HV-
Copyright © 2017, Texas Instruments Incorporated
Figure 52. Decoupling the AMC1303
Copyright © 2017, Texas Instruments Incorporated
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