AMC1304L05-Q1 Datasheet, PDF (30/39 Pages) Texas Instruments – High-Precision, Reinforced Isolated Delta-Sigma Modulators with LDO

AMC1304L05-Q1, AMC1304L25-Q1, AMC1304M05-Q1, AMC1304M25-Q1
SBAS799 – FEBRUARY 2017
10 Power-Supply Recommendations
www.ti.com
In a typical traction-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 58) as close as possible to
the LDOIN pin of the AMC1304-Q1 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-Q1 as possible, followed by an additional capacitor in the
range of 1 µF to 10 µF.
Floating
Power Supply
HV+ 18 V (max)
AMC1304-Q1
To Load
RSHUNT
Gate Driver
C1
C2
10 F 0.1 F
C3
0.1 F
Gate Driver
LDOIN
VCAP
DVDD
DGND
C4
0.1 F
C5
2.2 F
3.3 V or 5.0 V
AGND
AINN
AINP
DOUT
CLKIN
TMS320F28x7x
SD-Dx
SD-Cx
PWMx
HV-
Copyright © 2016, Texas Instruments Incorporated
Figure 58. Decoupling the AMC1304-Q1
30
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