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  • AMC3302 High-Precision, ±50-mV Input, Reinforced Isolated Amplifier With Integrated DC/DC Converter

    • SBASA11B August   2020  – July 2021 AMC3302

      PRODUCTION DATA  

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  • AMC3302 High-Precision, ±50-mV Input, Reinforced Isolated Amplifier With Integrated DC/DC Converter
  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Power Ratings
    6. 6.6  Insulation Specifications
    7. 6.7  Safety-Related Certifications
    8. 6.8  Safety Limiting Values
    9. 6.9  Electrical Characteristics
    10. 6.10 Switching Characteristics
    11. 6.11 Timing Diagram
    12. 6.12 Insulation Characteristics Curves
    13. 6.13 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Analog Input
      2. 7.3.2 Data Isolation Channel Signal Transmission
      3. 7.3.3 Analog Output
      4. 7.3.4 Isolated DC/DC Converter
      5. 7.3.5 Diagnostic Output
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Shunt Resistor Sizing
        2. 8.2.2.2 Input Filter Design
        3. 8.2.2.3 Differential to Single-Ended Output Conversion
      3. 8.2.3 Application Curve
    3. 8.3 What to Do and What Not to Do
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information
  13. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • DWE|16
    • MPSS091
Thermal pad, mechanical data (Package|Pins)
Orderable Information
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DATA SHEET

AMC3302 High-Precision, ±50-mV Input, Reinforced Isolated Amplifier With Integrated DC/DC Converter

1 Features

  • 3.3-V or 5-V single supply with integrated DC/DC converter
  • ±50-mV input voltage range optimized for current measurement using shunt resistors
  • Fixed gain: 41
  • Low DC errors:
    • Offset voltage: ±50 μV (max)
    • Offset drift: ±0.5 μV/°C (max)
    • Gain error: ±0.2% (max)
    • Gain error drift: ±35 ppm/°C (max)
    • Nonlinearity: ±0.03% (max)
  • High CMTI: 95 kV/µs (min)
  • System-level diagnostic features
  • Meets CISPR-11 and CISPR-25 EMI standards
  • Safety-related certifications:
    • 6000-VPK reinforced isolation per DIN VDE V 0884-11
    • 4250-VRMS isolation for 1 minute per UL1577
  • Fully specified over the extended industrial temperature range: –40°C to +125°C

2 Applications

  • Isolated current sensing in:
    • Protection relays
    • Motor drives
    • Power supplies
    • Photovoltaic inverters

3 Description

The AMC3302 is a precision, isolated amplifier optimized for shunt-based current measurements. The fully integrated, isolated DC/DC converter allows single-supply operation from the low-side of the device, which makes the device a unique solution for space-constrained applications. The reinforced capacitive isolation barrier is certified according to VDE V 0884-11 and UL1577 and supports a working voltage of up to 1.2 kVRMS.

The isolation barrier separates parts of the system that operate on different common-mode voltage levels and protects the low-voltage side from hazardous voltages and damage.

The input of the AMC3302 is optimized for direct connection to a low-impedance shunt resistor or another low-impedance voltage source with low signal levels. The excellent DC accuracy and low temperature drift supports accurate current measurements over the extended industrial temperature range from –40°C to +125°C.

The integrated DC/DC converter fault-detection and diagnostic output pin of the AMC3302 simplify system-level design and diagnostics.

Device Information(1)
PART NUMBER PACKAGE BODY SIZE (NOM)
AMC3302 SOIC (16) 10.30 mm × 7.50 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
GUID-20201216-CA0I-RL6S-RZL3-FJQ6Q6RMWNMH-low.gif Typical Application

4 Revision History

Changes from Revision A (February 2021) to Revision B (July 2021)

  • Changed link address for photovoltaic invertersGo
  • Changed LDO_OUT pin description in Pin Functions table to include that no external load is allowed on the LDO_OUT pinGo
  • Changed overvoltage category for rated mains voltage ≤ 600 V from I-IV to I-III and for rated mains voltage ≤1000 V from I-III to I-II Go
  • Changed CIO from ~3.5 pF to ~4.5 pFGo
  • Changed output bandwidth (BW) minimum value from 300 kHz to 290 kHzGo
  • Changed CMTI limits from 85 kV/µs (min), 135 kV/µs (typ) to 95 kV/µs (min), 155 kV/µs (typ)Go
  • Deleted histograms from Typical Characteristics sectionGo
  • Changed first bullet in Isolated DC/DC Converter section to include that the low-side LDO does not output a constant output voltage and is not intended for driving any external loadGo
  • Added discussion of high-side and low-side LDO to What to Do and What Not to Do sectionGo
  • Added information on reducing radiated emission to Power Supply Recommendations section, changed Recommended External Components tableGo
  • Added ferrite beads to Recommended Layout of the AMC3302 figureGo
  • Added EMI application note to Related Documentation sectionGo

Changes from Revision * (August 2020) to Revision A (February 2021)

  • Changed document status from advance information to production dataGo
  • Added VDDUV and VDDPOR specificationsGo

5 Pin Configuration and Functions

GUID-20201216-CA0I-8ZPH-C6HC-6VQML9PKTK7K-low.gif Figure 5-1 DWE Package, 16-Pin SOIC, Top View
Table 5-1 Pin Functions
PIN TYPE DESCRIPTION
NO. NAME
1 DCDC_OUT Power High-side output of the isolated DC/DC converter; connect this pin to the HLDO_IN pin.(1)
2 DCDC_HGND High-side power ground High-side ground reference for the isolated DC/DC converter; connect this pin to the HGND pin.
3 HLDO_IN Power Input of the high-side LDO; connect this pin to the DCDC_OUT pin(1)
4 NC — No internal connection; connect this pin to HGND or leave this pin unconnected.
5 HLDO_OUT Power Output of the high-side LDO.(1)
6 INP Analog input Noninverting analog input. Either INP or INN must have a DC current path to HGND to define the common-mode input voltage.(2)
7 INN Analog input Inverting analog input. Either INP or INN must have a DC current path to HGND to define the common-mode input voltage.(2)
8 HGND High-side signal ground High-side analog ground; connect this pin to the DCDC_HGND pin.
9 GND Low-side signal ground Low-side analog ground; connect this pin to the DCDC_GND pin.
10 OUTN Analog output Inverting analog output.
11 OUTP Analog output Noninverting analog output.
12 VDD Low-side power Low-side power supply.(1)
13 LDO_OUT Power Output of the low-side LDO; connect this pin to the DCDC_IN pin. The output of the LDO must not be loaded by external circuitry.(1)
14 DIAG Digital output Active-low, open-drain status indicator output; connect this pin to the pullup supply (for example, VDD) using a resistor or leave this pin floating if not used.
15 DCDC_GND Low-side power ground Low-side ground reference for the isolated DC/DC converter; connect this pin to the GND pin.
16 DCDC_IN Power Low-side input of the isolated DC/DC converter; connect this pin to the LDO_OUT pin.(1)
(1) See the Section 9 section for power-supply decoupling recommendations.
(2) See the Section 10 section for details.

 
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