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AMC3301

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SBAS917 – AUGUST 2019

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Feature Description (continued)

7.3.3 Isolated DC/DC Converter

The AMC3301 offers a fully integrated isolated DC/DC converter stage that includes following components that

are shown in the Functional Block Diagram section:

•

A low-dropout regulator (LDO) on the primary side to stabilize the supply voltage VDD that drives the primary

side of the converter

•

Primary full-bridge inverter and drivers

•

Laminate-based, air-core transformer for high immunity to magnetic fields

•

Secondary full-bridge rectifier

•

Secondary LDO to stabilize the output voltage of the DC/DC converter for high analog performance of the

signal path

The DC/DC converter utilizes spread-spectrum clock generation technique to reduce the spectral density of the

electromagnetic radiation. The resonator frequency is synchronous to the operation of the ΔΣ modulator to

minimize the interference and support the high analog performance of the device.

The architecture of the DC/DC converter is optimized to drive the high-side circuitry of the AMC3301 (fully-

differential gain stage, modulator etc.) and to offer additional current for optional auxiliary circuit (i.e. active fllter

7.3.4 Fail-Safe Output

The AMC3301 offers a fail-safe output that simplifies diagnostics on system level. The fail-safe output is active in

two cases:

•

When the integrated DC/DC converter doesn't deliver the required supply voltage on the secondary side of

the device, or

•

Figure 7 and Figure 8 show the fail-safe output of the AMC3301 that is a negative differential output voltage

value that does not occur under normal device operation. As a reference value for the fail-safe detection on a

Figure 7. Typical Negative Clipping Output of the

AMC3301

Figure 8. Typical Failsafe Output of the AMC3301

7.4 Device Functional Modes

The AMC3301 is operational when the power supply VDD is applied, as specified in Recommended Operating

Conditions table.