AMC1304L05 Datasheet, PDF (28/39 Pages) Texas Instruments – High-Precision Reinforced Isolated Delta-Sigma Modulators

AMC1304L05, AMC1304L25, AMC1304M05, AMC1304M25
SBAS655C – SEPTEMBER 2014 – REVISED SEPTEMBER 2015
10 Power-Supply Recommendations
www.ti.com
In a typical frequency-inverter application, the high-side power supply (LDOIN) for the device is directly derived
from the floating power supply of the upper gate driver. A low-ESR decoupling capacitor of 0.1 µF is
recommended for filtering this power-supply path. Place this capacitor (C2 in Figure 55) as close as possible to
the LDOIN pin of the AMC1304 for best performance. If better filtering is required, an additional 10-µF capacitor
can be used. The output of the internal LDO requires a decoupling capacitor of 0.1 µF to be connected between
the VCAP pin and AGND as close as possible to the device.
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 AMC1304 as possible, followed by an additional capacitor in the
range of 1 µF to 10 µF.
Floating
Power Supply
HV+ 18 V (max)
AMC1304
to load
RSHUNT
Gate Driver
C1
10 F
C2
0.1 F
C3
0.1 F
LDOIN
VCAP
DVDD
DGND
C4
0.1 F
C5
2.2 F
3.3 V, or 5.0 V
AGND
AINP
AINN
DOUT
CLKIN
SD-Dx
SD-Cx
Gate Driver
TMS320F28x7x
HV-
Figure 55. Decoupling the AMC1304
28
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