SBASA83 April   2021 AMC3336-Q1

PRODUCTION DATA  

  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 Diagrams
    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 Modulator
      3. 7.3.3 Isolation Channel Signal Transmission
      4. 7.3.4 Digital Output
        1. 7.3.4.1 Output Behavior in Case of a Full-Scale Input
        2. 7.3.4.2 Output Behavior in Case of a High-Side Supply Failure
      5. 7.3.5 Isolated DC/DC Converter
      6. 7.3.6 Diagnostic Output
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Digital Filter Usage
    2. 8.2 Typical Application
      1. 8.2.1 On-Board Charger Application
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Input Filter Design
          2. 8.2.1.2.2 Bitstream Filtering
        3. 8.2.1.3 Application Curve
      2. 8.2.2 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 Device Support
      1. 11.1.1 Device Nomenclature
        1. 11.1.1.1 Isolation Glossary
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Support Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary

9 Power Supply Recommendations

The AMC3336-Q1 is powered from the low-side power supply (VDD) with a nominal value of 3.3 V (or 5 V). TI recommends a low ESR decoupling capacitor of 1 nF (C8 in Figure 9-1) placed as close as possible to the VDD pin, followed by a 1-µF capacitor (C9) to filter this power-supply path.

The low-side of the DC/DC converter is decoupled with a low-ESR, 100-nF capacitor (C4) positioned close to the device between the DCDC_IN and DCDC_GND pins. Use a 1-µF capacitor (C2) to decouple the high-side in addition to a low-ESR, 1-nF capacitor (C3) placed as close as possible to the device and connected to the DCDC_OUT and DCDC_HGND pins.

For the high-side LDO, use low-ESR capacitors of 1-nF (C6), placed as close as possible to the AMC3336-Q1, followed by a 100-nF decoupling capacitor (C5).

The ground reference for the high-side (HGND) is derived from the terminal of the sense resistor that is connected to the negative input (INN) of the device. IIN and HGND can be shorted together directly at the device pins. The high-side DC/DC ground terminal (DCDC_HGND) is also shorted to HGND directly at the device pins.

GUID-20210327-CA0I-KFLN-Z5MR-WQPSZX8ZXLHC-low.svg Figure 9-1 Decoupling the AMC3336-Q1

Capacitors must provide adequate effective capacitance under the applicable DC bias conditions they experience in the application. MLCC capacitors typically exhibit only a fraction of their nominal capacitance under real-world conditions and this factor must be taken into consideration when selecting these capacitors. This problem is especially acute in low-profile capacitors, in which the dielectric field strength is higher than in taller components. Reputable capacitor manufacturers provide capacitance versus DC bias curves that greatly simplify component selection.

Table 9-1 lists components suitable for use with the AMC3336-Q1. This list is not exhaustive. Other components may exist that are equally suitable (or better), however these listed components have been validated during the development of the AMC3336-Q1.

Table 9-1 Recommended External Components
DESCRIPTION PART NUMBER MANUFACTURER SIZE (EIA, L x W)
VDD
C8 1 nF ± 10%, X7R, 50 V 12065C102KAT2A AVX 1206, 3.2 mm x 1.6 mm
C9 1 µF ± 10%, X7R, 25 V 12063C105KAT2A AVX 1206, 3.2 mm x 1.6 mm
DC/DC CONVERTER
C4 100 nF ± 10%, X7R, 50 V C0603C104K5RACAUTO Kemet 0603, 1.6 mm x 0.8 mm
C3 1 nF ± 10%, X7R, 50 V C0603C102K5RACTU Kemet 0603, 1.6 mm x 0.8 mm
C2 1 µF ± 10%, X7R, 25 V CGA3E1X7R1E105K080AC TDK 0603, 1.6 mm x 0.8 mm
HLDO
C1 100 nF ± 10%, X7R, 50 V C0603C104K5RACAUTO Kemet 0603, 1.6 mm x 0.8 mm
C5 100 nF ± 5%, NP0, 50 V C3216NP01H104J160AA TDK 1206, 3.2 mm x 1.6 mm
C6 1 nF ± 10%, X7R, 50 V 12065C102KAT2A AVX 1206, 3.2 mm x 1.6 mm