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Texas Instruments AMC1311DWVR | Demoboard TIDA-010065

High-efficiency, low-emission, isolated DC/DC converter-based analog input module reference design

Overview

TopologyOther Topology
Input voltage2 V
IC revisionE2

Description

This reference design is a simplified architecture for generating an isolated power supply for isolated amplifiers for measuring isolated voltages and currents. A fully integrated DC/DC converter with reinforced isolation operating from a 5-V input with configurable 5-V or 5.4-V output (headroom for low dropout regulator (LDO)) generates the isolated power. Shunts that are interfaced to ±50-mV input range isolation amplifiers configured as channel isolated inputs measure the current. Potential divider output interfaced to ±250-mV or ±12-V input range isolation amplifiers configured as group isolated inputs measure the voltage. The outputs of the isolation amplifiers interface directly to 24-bit delta sigma analog-to-digital converter (ADC) or are scaled to ±10 V using gain amplifiers and interfaced to 16-bit SAR ADC for performance evaluation. On-board digital diagnostics improves reliability and enhances system performance.

Features

  • Generation of high efficiency isolated supply of 5 or 5.4V (LDO head room) from 4.5 to 5.5 V input providing reinforced isolation
  • Measures three group isolated voltage inputs with a range of 3-350V providing pin compatible basic or reinforced isolation and three isolated current inputs from 40mA-12.5A providing reinforced isolation
  • ISO224 with input range of ±12V input range connects directly to low power current transformer output as per IEC 60044-8
  • Measurement of DC voltage and current with 1us fast fault detection comparator path
  • Gain scaling of isolation amplifier output to ADS8588H input range of ±10V using instrumentation, precision or general purpose amplifiers
  • Achieves ±0.2% accuracy for both voltage and current using 16-bit SAR or 24-bit delta-sigma ADC

Typical applications

  • AC analog input module / Multifunction relay

Products

Order Code Data­sheet Downloads Product seriesCTol. CVR
(V (DC))
SizeDF
(%)
Ceramic TypeL
(mm)
W
(mm)
Fl
(mm)
Technical ReferenceZ @ 100 MHz
(Ω)
Zmax
(Ω)
Test Condition ZmaxIR
(mA)
RDC typ.
(mΩ)
Z @ 1 GHz
(Ω)
H
(mm)
Type Samples
885012206040SPEC

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

7 files WCAP-CSGP MLCCs 16 V(DC)10 nF ±10% 16 0603 3.5 X7R Class II 1.6 0.8 X7R0603103K016DFCT10000 0.8
74279228260SPEC
9 files WE-MPSB EMI Multilayer Power Suppression Bead 0603 1.6 0.8 0.3 26 39 515 MHz 6500 5 33 0.8 High Current
Order Code Data­sheet
885012206040SPEC

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

74279228260SPEC
Samples
Order Code Data­sheet Downloads Product seriesCTol. CVR
(V (DC))
SizeDF
(%)
Ceramic TypeL
(mm)
W
(mm)
Fl
(mm)
Technical ReferenceZ @ 100 MHz
(Ω)
Zmax
(Ω)
Test Condition ZmaxIR
(mA)
RDC typ.
(mΩ)
Z @ 1 GHz
(Ω)
H
(mm)
Type Samples