AMC131M01DFMR datasheet(18/81 Pages) TI

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8.3 Feature Description

8.3.1 Isolated DC/DC Converter

The AMC131M01 offers a fully integrated isolated DC/DC converter stage that includes the following

components, as illustrated in the Functional Block Diagram:

• Low-dropout regulator (LDO) on the primary side to stabilize the supply voltage 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 uses a 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 interference with data transmission and support the high analog performance of the device.

8.3.1.1 DC/DC Converter Failure Detection

A failure in the DC/DC converter is indicated by reading a logic high of the SEC_FAIL bit in the STATUS

but the DC/DC converter recovers from the failure and operates normally after this instance, the SEC_FAIL bit

remains in a logic high state until the STATUS register is read. Reading the status register clears the SEC_FAIL

bit. As described in the Start-Up Behavior After Power-Up section, use two consecutive STATUS register read

commands to verify correct operation of the DC/DC converter at a given point in time (for example, at device

power-up).

8.3.2 High-Side Current Drive Capability

The architecture of the DC/DC converter is optimized to drive the high-side circuitry of the AMC131M01

and can source up to IH of additional DC current for external circuitry (such as an active filter, preamplifier,

or comparator). Use the HLDO_OUT pin as a power supply for this external circuit. Because of the output

impedance at the HLDO_OUT pin, the voltage at HLDO_OUT depends on the magnitude of the drive current

and the selected power mode. For operation across all temperatures and power modes, components for the

external circuits must operate at a low supply voltage (such as 2.7 V). See the Clocking and Power Modes

section for details on the available power modes.

8.3.3 Isolation Channel Signal Transmission

The AMC131M01 uses an on-off keying (OOK) modulation scheme to transmit the modulator output bitstream

across the capacitive SiO2-based isolation barrier. After transmission across the isolation barrier, the modulator

output bitstream is decimated using the sinc filter to reconstruct the ADC conversion data, and is then

transferred to the digital control so that the data are accessible through the SPI interface. Figure 8-1 depicts

the block diagram of an isolation channel. The transmitter modulates the bitstream at TX IN with an internally

generated, 480-MHz carrier and sends a burst across the isolation barrier to represent a digital one and

sends a no signal to represent the digital zero. The receiver demodulates the signal after advanced signal

conditioning and produces the output. The symmetrical design of each isolation channel improves the common-

mode transient immunity (CMTI) performance and reduces the radiated emissions caused by the high-frequency

carrier.

AMC131M01

SBASA57 – SEPTEMBER 2023

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