SLVSE94G September   2018  – June 2024

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 Timing Requirements
    7. 6.7 Typical Characteristics
  8. 7 Parameter Measurement Information
  9. 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 Inrush Current Control
        1. 8.3.1.1 Thermal Regulation Loop
      2. 8.3.2  PGOOD and PGTH
        1. 8.3.2.1 PGTH as VOUT Sensing Input
      3. 8.3.3  Undervoltage Lockout (UVLO)
      4. 8.3.4  Overvoltage Protection (OVP)
      5. 8.3.5  Input Reverse Polarity Protection (B_GATE, DRV)
      6. 8.3.6  Reverse Current Protection
      7. 8.3.7  Overload and Short-Circuit Protection
        1. 8.3.7.1 Overload Protection
          1. 8.3.7.1.1 Active Current Limiting at 1 × IOL (TPS26630 and TPS26632 Only)
          2. 8.3.7.1.2 Active Current Limiting With 2 × IOL Pulse Current Support (TPS26631, TPS26633, TPS26635, TPS26636, and TPS26637 Only)
        2. 8.3.7.2 Short-Circuit Protection
          1. 8.3.7.2.1 Start-Up With Short Circuit on Output
      8. 8.3.8  Output Power Limiting, PLIM (TPS26632, TPS26633, TPS26635, TPS26636, and TPS26637 Only)
      9. 8.3.9  Current Monitoring Output (IMON)
      10. 8.3.10 FAULT Response (FLT)
      11. 8.3.11 IN_SYS, IN, OUT, and GND Pins
      12. 8.3.12 Thermal Shutdown
      13. 8.3.13 Low Current Shutdown Control (SHDN)
    4. 8.4 Device Functional Modes
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application: Power Path Protection in a PLC System
      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 Output Buffer Capacitor – COUT
        4. 9.2.2.4 PGTH Set Point
        5. 9.2.2.5 Setting Output Voltage Ramp Time—(tdVdT)
          1. 9.2.2.5.1 Support Component Selections— RPGOOD and C(IN)
        6. 9.2.2.6 Selecting Q1, Q2 and TVS Clamp for Surge Protection
      3. 9.2.3 Application Curves
    3. 9.3 System Examples
      1. 9.3.1 Simple 24-V Power Supply Path Protection
      2. 9.3.2 Priority Power MUX Operation
      3. 9.3.3 Input Protection for a Compact 24-V Auxiliary Power Supply for Servo Drives
    4. 9.4 Dos and Do Nots
    5. 9.5 Power Supply Recommendations
      1. 9.5.1 Transient Protection
    6. 9.6 Layout
      1. 9.6.1 Layout Guidelines
      2. 9.6.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

8.3.8 Output Power Limiting, PLIM (TPS26632, TPS26633, TPS26635, TPS26636, and TPS26637 Only)

The TPS26630 and TPS26631 devices with a fixed overcurrent limit threshold the maximum output power limit increases linearly with supply input. Electrical industrial process control equipment such as PLC CPU must comply with standards like IEC61010-1 and UL1310 for fire safety, which require limited energy and power circuits. Limiting the output power becomes a challenge in such high power applications where the operating supply voltage range is wide. The TPS26632, TPS26633, TPS26635, and TPS26636 devices integrate adjustable output power limiting functionality that simplifies the system design requiring compliance in accordance to this standard.

Connect a resistor from PLIM to GND as shown in Figure 8-18 to set the output power limiting value. If output power limiting is not required then connect PLIM to GND directly. This action disables the PLIM functionality.

During an over power load event, the TPS26632 limits the output power at the programmed value set by PLIM resistor. This action indirectly results in the device operation in current limiting mode with steady state output voltage and current set by the load characteristics and PLIM = VOUT × IOUT. Figure 6-12 shows the output power limit and current limit characteristics of TPS26632 with 100-W power limit setting. The maximum duration for the device in power limiting mode is 162 ms (typical), tCL_PLIM(dly). After this time, the device operates either in auto-retry or latch-off mode based on MODE pin configuration in Table 8-1.

During an over power load event, the TPS26633, TPS26635, TPS26636 and TPS26637 allows the extra power for a maximum duration of tCB(dly), 25.5 ms (typical). The maximum power during this time is limited to VOUT × 2 × IOL where IOL is the overload current limit set by the R(ILIM) resistor. After the tCB(dly) time, the output power gets limited to the value programmed by the PLIM resistor. Use Equation 6 to set the power limit.

Equation 6. P(PLIM) = 1 × R(PLIM)

Here, P(PLIM) is output power limit in watts, R(PLIM) is the power limit setting resistor in kΩ. Figure 8-19 and Figure 8-20 illustrate output power limiting performance of TPS26632 and TPS26633 devices respectively.

Refer to Figure 7-2 for more information on tCB(dly) and tCL_PLIM(dly) parameter measurement information.

TPS2663 TPS26632, TPS26633, TPS26635, TPS26636, and TPS26637 Typical Application Schematic Figure 8-18 TPS26632, TPS26633, TPS26635, TPS26636, and TPS26637 Typical Application Schematic
TPS2663 100-W Class 2, Output Power Limiting Response of TPS26632
RPLIM = 100 kΩ RILIM = 3 kΩ
Figure 8-19 100-W Class 2, Output Power Limiting Response of TPS26632
TPS2663 100-W Class 2, Output Power Limiting Response of TPS26633
RPLIM = 100 kΩ RILIM = 3 kΩ
Figure 8-20 100-W Class 2, Output Power Limiting Response of TPS26633
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