AMC3336 datasheet(23/41 Pages) TI

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7.3.5 Isolated DC/DC Converter

The AMC3336 offers a fully integrated isolated DC/DC converter stage that includes the following components

illustrated in the Functional Block Diagram:

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

of the DC/DC converter. This circuit does not output a constant voltage and is not intended for driving any

external load.

• Low-side full-bridge inverter and drivers

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

• High-side full-bridge rectifier

• High-side LDO to stabilize the output voltage of the DC/DC converter for high analog performance of the

signal path. The high-side LDO outputs a constant voltage and can provide a limited amount of current to

power external circuitry.

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

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

minimize interference with data transmission 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 AMC3336 and can

source up to IH of additional DC current for an optional auxiliary circuit such as an active filter, preamplifier, or

comparator. As shown in Figure 7-6, IH is specified up to an ambient temperature of 85°C and derates linearly at

higher temperatures.

TA (qC)

-40

-25

-10

110 125

0.25

0.5

0.75

1.25

D005

D048

Figure 7-6. Derating of IH at Ambient Temperatures >85°C

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AMC3336

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AMC3336 Datasheet(PDF) 23 Page - Texas Instruments