SLVSGD3B December   2022  – August 2024 TPS281C30

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 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 Electrical Characteristics
    6. 6.6 SNS Timing Characteristics
    7. 6.7 Switching Characteristics
    8. 6.8 Typical Characteristics
  8. 7 Parameter Measurement Information
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Device Functional Modes
      1. 8.3.1 Working Mode
    4. 8.4 Feature Description
      1. 8.4.1 Accurate Current Sense
        1. 8.4.1.1 High Accuracy Sense Mode
      2. 8.4.2 Programmable Current Limit
        1. 8.4.2.1 Short-Circuit and Overload Protection
        2. 8.4.2.2 Capacitive Charging
      3. 8.4.3 Inductive-Load Switching-Off Clamp
      4. 8.4.4 Inductive Load Demagnetization
      5. 8.4.5 Full Protections and Diagnostics
        1. 8.4.5.1 Open-Load Detection
        2. 8.4.5.2 Thermal Protection Behavior
        3. 8.4.5.3 Undervoltage Lockout (UVLO) Protection
        4. 8.4.5.4 Overvoltage (OVP) Protection
        5. 8.4.5.5 Reverse Polarity Protection
        6. 8.4.5.6 Protection for MCU I/Os
        7. 8.4.5.7 Diagnostic Enable Function
        8. 8.4.5.8 Loss of Ground
        9. 8.4.5.9 Enhanced EFT Immunity
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
        1. 9.2.1.1 IEC 61000-4-5 Surge
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Selecting RILIM
        2. 9.2.2.2 Selecting RSNS
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
        1. 9.4.1.1 EMC Considerations
      2. 9.4.2 Layout Example
        1. 9.4.2.1 PWP Layout without a GND Network
        2. 9.4.2.2 PWP Layout with a GND Network
        3. 9.4.2.3 RGW Layout with a GND Network
      3. 9.4.3 Thermal Considerations
  11. 10Device and Documentation Support
    1. 10.1 Receiving Notification of Documentation Updates
    2. 10.2 Support Resources
    3. 10.3 Trademarks
    4. 10.4 Electrostatic Discharge Caution
    5. 10.5 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.4.5 Full Protections and Diagnostics

Current Sensing is active when DIAG_EN enabled. When DIAG_EN is low, current sense is disabled. The SNS output is internally clamped to around 1V if there is an external voltage appear at SNS pin.

Table 8-2 DIAG_EN Logic Table
DIAG_ENEN ConditionProtections and Diagnostics
HIGH

HIGH

See Fault Table
LOW
LOWHIGHDiagnostics disabled and SNS output is clamped internally to around 1V. Protection is normal and FAULT continues to indicate TSD or ILIM.
LOW

Table 8-3 Status Table (DIAG_EN=HIGH )

Conditions

EN

VOUT

OL_ON

FAULT

SNS

Behavior

Recovery

Normal

Standard Sensing

L

L

L

Hi-Z

0

Normal

H

H

L

Hi-Z

ILoad / Ksns1

Normal

High Accuracy Sense

Invalid Range

HHHL

ILoad / Ksns1

FAULT is asserted signaling that high accuracy sensing is not enabled since ILoad>IKsns2_EN

Clears when load falls below IKSNS2_EN or OL_ON is reset to LO.

High Accuracy Sense

Normal Operation

HHH

Hi-Z

ILoad / Ksns2

Enables x50 sense ratio for high accuracy sensing and FAULT stays Hi-Z since valid condition is met ILoad<IKsns2_EN.

Overcurrent

H

VS - ILIM*RLOAD

x

L

VSNSFH

Holds the current at the current limit until thermal shutdown

STG, Relative Thermal Shutdown, Absolute Thermal Shutdown

H

H/L

x

L

VSNSFH

Shuts down when devices hits relative or absolute thermal shutdown

Auto retries when THYSis met and it has been longer than tRETRY amount of time

Open Load (not available in Ver. E)

H

H

L

Hi-Z

ILoad / Ksns1 = ~0

Normal behavior, user can judge if it is an open load or not

H

H

H

Hi-Z

ILoad / Ksns2 = ~0Normal behavior, user can judge if it is an open load or not

L

H

L

L

VSNSFH

Internal pullup resistor is active. If VS – VOUT < VOL then fault active

Clears when fault goes away

Reverse Polarity

x

x

x

x

x

Channel turns on to lower power dissipation. Current into ground pin is limited by external ground network