AMC1200-Q1_16 Datasheet, PDF (18/30 Pages) Texas Instruments – Fully-Differential Isolation Amplifier

AMC1200-Q1
SBAS585A – SEPTEMBER 2012 – REVISED JANUARY 2016
www.ti.com
9 Power Supply Recommendations
In a typical frequency inverter application, the high-side power supply for the AMC1200-Q1 (VDD1) is derived
from the system supply, as shown in Figure 36. For lowest cost, a Zener diode can be used to limit the voltage to
5 V ± 10%. Using a 0.1-µF, low-ESR decoupling capacitor is recommended for filtering VDD1. Using a 0.1-µF
decoupling capacitor is also recommended for filtering the power-supply on the VDD2 side. For best
performance, place the decoupling capacitors (C₁ and C₄) as close as possible to the VDD1 and VDD2 pins,
respectively. If better filtering is required, an additional 1-µF to 10-µF capacitor can be used in parallel to C₁ and
C₄.
Floating
Power Supply,
HV+
20 V
To Load
RSHUNT
Gate Driver
Z1
1N751A
R1
800
5.1 V
C1
0.1 F
Gate Driver
R2
C3
12
330 pF
R3
12
AMC1200-Q1
VDD1
GND1
VDD2
GND2
C4
0.1 F
VINP
VOUTP
VINN
VOUTN
3.3 V or 5.0 V
ADS7263
HV-
Figure 36. Zener Diode Based High-Side Supply
For higher power efficiency and better performance, a buck converter can be used to generate VDD1; an
example of such an approach is based on the LM5017. The PMP9480 reference design (Isolated Bias Supplies
+ Isolated Amplifier Combo for Line Voltage or Current Measurement) with performance test results and layout
documentation is available from www.ti.com.
The AMC1200-Q1 does not require any particular power sequence and is operational when both power supplies,
VDD1 and VDD2, are applied.
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