SLUSF58A December   2023  – April 2024 UCC23525

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Function
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  Recommended Operating Conditions
    4. 5.4  Thermal Information
    5. 5.5  Power Ratings
    6. 5.6  Insulation Specifications
    7. 5.7  Safety Limiting Values
    8. 5.8  Electrical Characteristics
    9. 5.9  Switching Characteristics
    10. 5.10 Thermal Derating Curves
    11. 5.11 Typical Characteristics
  7. 6 Parameter Measurement Information
    1. 6.1 Propagation Delay, Rise Time and Fall Time
    2. 6.2 IOH and IOL Testing
    3. 6.3 CMTI Testing
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Power Supply
      2. 7.3.2 Input Stage
      3. 7.3.3 Output Stage
      4. 7.3.4 Protection Features
        1. 7.3.4.1 Undervoltage Lockout (UVLO)
        2. 7.3.4.2 Active Pulldown
        3. 7.3.4.3 Short-Circuit Clamping
        4. 7.3.4.4 ESD Structure
    4. 7.4 Device Functional Modes
  9. 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 Selecting the Input Resistor
        2. 8.2.2.2 Gate Driver Output Resistor
        3. 8.2.2.3 Estimate Gate-Driver Power Loss
        4. 8.2.2.4 Estimating Junction Temperature
        5. 8.2.2.5 Selecting VDD Capacitor
  10. 9 Power Supply Recommendations
  11. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 PCB Material
  12. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    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
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information
    1. 13.1 Package Option Addendum
    2. 13.2 Tape and Reel Information
    3. 13.3 Mechanical Data

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • DWY|6
Thermal pad, mechanical data (Package|Pins)

8.2.2.1 Selecting the Input Resistor

The input resistor limits the current that flows into the e-diode when it is forward biased. The threshold current IFLH is 1 mA typ. The recommended operating range for the forward current is 5 mA to 20 mA (e-diode ON). All the electrical specifications are ensured in this range. The resistor should be selected such that for typical operating conditions, IF is 10 mA. Following are the list of factors that will affect the exact value of this current:

  1. Supply Voltage VSUP variation
  2. Manufacturer's tolerance for the resistor and variation due to temperature
  3. e-diode forward voltage drop variation (at IF=10 mA, VF= typ 1.7 V, min 1.4 V, max 2 V, with a temperature coefficient < 0.9 mV/°C and dynamic impedance < 1 Ω)

See Figure 8-2 for the schematic using a single buffer and anode resistor combination to drive the input stage of UCC23525. The input resistor can be selected using Equation 1.

GUID-20231214-SS0I-P3BL-1QTT-7BLPCKV1F0LL-low.svg Figure 8-2 Driving the Input Stage of UCC23525 with One Buffer and Anode Resistor
Equation 1. R E X T = V S U P - V F I F - R OH_buf

Table 8-2 shows the range of values for REXT for Figure 8-2. The assumptions used in deriving the range for REXT are as follows:

  1. Target forward current IF is 5 mA min, 10 mA typ and 20 mA max
  2. e-diode forward voltage drop is 1.4 V to 2.
  3. VSUP (Buffer supply voltage) is 5 V with ±5% tolerance
  4. Manufacturer's tolerance for REXT is 1%
  5. ROH (buffer output impedance in output "High" state) is 13 Ω min, 18 Ω typ and 22 Ω max

Table 8-2 REXT Values to Drive the Input Stage
REXT Ω

Configuration

 Min Typ Max
Single Buffer and REXT 115 312 757