JAJSL99 August   2021 TPS1653

PRODUCTION DATA  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
  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 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Hot Plug-In and In-Rush Current Control
        1. 8.3.1.1 Thermal Regulation Loop
      2. 8.3.2  Undervoltage Lockout (UVLO)
      3. 8.3.3  Overload and Short Circuit Protection
        1. 8.3.3.1 Overload Protection
        2. 8.3.3.2 Short Circuit Protection
          1. 8.3.3.2.1 Start-Up With Short-Circuit On Output
      4. 8.3.4  Current Monitoring Output (IMON)
      5. 8.3.5  FAULT Response (FLT)
      6. 8.3.6  Power Good Output (PGOOD)
      7. 8.3.7  IN, P_IN, OUT and GND Pins
      8. 8.3.8  Thermal Shutdown
      9. 8.3.9  Low Current Shutdown Control (SHDN)
      10. 8.3.10 Enable Input (EN)
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Programming the Current-Limit Threshold R(ILIM) Selection
        2. 9.2.2.2 Undervoltage Lockout and Overvoltage Set Point
        3. 9.2.2.3 Setting Output Voltage Ramp Time (tdVdT)
          1. 9.2.2.3.1 Support Component Selections RPGOOD and C(IN)
      3. 9.2.3 Application Curves
    3. 9.3 System Examples
      1. 9.3.1 48-V Power Amplifier Protection for Telecom Radios
  10. 10Power Supply Recommendations
    1. 10.1 Transient Protection
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 サポート・リソース
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

8.3.3.1 Overload Protection

The TPS16530 device features accurate overload current limiting and fast short circuit protection feature. The device supports a pulse current up to 9A (2 × IOL) for transient loads. Table 8-1 describes the overload response of TPS16530 device.

Table 8-1 Overload Response of TPS16530 Device
Output Current Overload or Over-Current Response
IOUT < IOL No action. Device provides current up-to IOL.
IOL ≤ IOUT < 2 × IOL Device provides current up to 2 × IOL for a duration of tCB(dly) and then limits current to IOL for a maximum duration of tCL_ILIM(dly).
2 × IOL ≤ IOUT < 3 × IOL Device limits current to 2 × IOL for a maximum duration of tCB(dly) and then limits current to IOL for a maximum duration of tCL_ILIM(dly).
3 × IOL ≤ IOUT Device provides fast trip protection or short circuit protection and turns off the internal FET. See the Section 8.3.3.2 section.
The power dissipation across the device during this operation will be [(VIN – VOUT) × IOL] for IOUT < 2 × IOL or [(VIN – VOUT) × 2 × IOL] for 2 × IOL < IOUT < 3 × IOLand this could heat up the device and eventually enter into thermal shutdown.

For current limit of IOL, the maximum duration for current limiting is tCL_ILIM(dly), 162 msec (typical). For current limit of 2 × IOL, the maximum duration for current limiting is tCB(dly), 25 msec (typical) .

If the thermal shutdown occurs before this time the internal FET turns OFF and the device operates either in auto-retry or latch off mode based on MODE pin configuration in Table 8-2. Set the current limit using Equation 4.

Equation 4. GUID-F347EC70-4929-43BE-A5E7-2522A05F6F2E-low.gif

where

  • I(OL) is the overload current limit in Ampere
  • R(ILIM) is the current limit resistor in kΩ

During the overload current limiting, if the overload condition exists for more than tCL_ILIM_FLT(dly), 1.3 msec (typical), the FLT asserts to warn of impending turnoff of the internal FETs due to the subsequent thermal shutdown event or due to tCL_ILIM(dly) timer expiry. The FLT signal remains asserted until the fault condition is removed and the device resumes normal operation. Figure 8-4 shows the device behavior in case of overload event. The device provides a pulse current of 7 A for a duration of 25 ms and then turns off the internal FET due to thermal shutdown before the expiry of tCL_ILIM(dly).

The 2 × I(OL) pulse current support is activated only after PGOOD goes high. If PGOOD is in low state such as during start-up operation or during auto-retry cycles, the 2 × I(OL) pulse current support is not activated and the device limits the current at I(OL) level.

GUID-20210805-CA0I-RWTK-FPHT-MKV38ZVF7JJQ-low.png
VIN = 58 V ILIM = 4.5 A IOUT = 4 A to 7 A
Figure 8-4 Pulse Current Support

The TPS16530 device feature ILIM pin short and open fault detection and protection. The internal FET is turned OFF when ILIM pin is detected short or open to GND and it remains OFF till the ILIM pin fault is removed.