AMC1100_15 Datasheet, PDF (19/33 Pages) Texas Instruments – AMC1100 Fully-Differential Isolation Amplifier

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AMC1100
SBAS562A – APRIL 2012 – REVISED DECEMBER 2014
9 Power Supply Recommendations
In a typical frequency inverter application, the high-side power supply for the AMC1100 (VDD1) is derived from
the system supply, as shown in Figure 39. For lowest cost, a Zener diode can be used to limit the voltage to 5 V
± 10%. A 0.1-µF decoupling capacitor is recommended for filtering this power-supply path. Place this capacitor
(C₁) as close as possible to the VDD1 pin for best performance. If better filtering is required, an additional 1-µF to
10-µF capacitor can be used.
Floating
Power Supply
HV+
20 V
to load
RSHUNT
Gate Driver
Z1
1N751A
R1
800 
5.1 V
C1
0.1F
Gate Driver
R2
12 
R3
12 
C3
330pF
AMC1100
VDD1
GND1
VDD2
GND2
C4
0.1F
VINP
VOUTP
VINN
VOUTN
3.3 V, or 5.0 V
ADS7263
HV-
Figure 39. Zener Diode Based High-Side Supply
For higher power efficiency and better performance, a buck converter can be used; an example of such an
approach is based on the LM5017. A reference design including performance test results and layout
documentation can be downloaded at PMP9480, Isolated Bias Supplies + Isolated Amplifier Combo for Line
Voltage or Current Measurement.
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