VOUTP

VOUTN

VDD2

GND2

GND1

VINP

VINN

VDD1

AMC1100

HV+

HV-

to load

Floating

Power Supply

20 V

3.3 V, or 5.0 V

Gate Driver

Gate Driver

5.1 V

R1

800

Z1

1N751A

C1

0.1 F

R2

12

R3

12

C3

330pF

C4

0.1 F

ADS7263

RSHUNT

21

AMC1100

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SBAS562B – APRIL 2012 – REVISED DECEMBER 2019

Product Folder Links: AMC1100

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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 41. 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.

Figure 41. 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.