SLVUCY3 October   2024 LM65680-Q1

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Test Setup and Procedure
      1. 2.1.1 EVM Connections
      2. 2.1.2 Test Equipment
      3. 2.1.3 Recommended Test Setup
        1. 2.1.3.1 Input Connections
        2. 2.1.3.2 Output Connections
      4. 2.1.4 Test Procedure
        1. 2.1.4.1 Line, Load Regulation, and Efficiency
  8. 3Implementation Results
    1. 3.1 Performance Data and Results
      1. 3.1.1 EVM Characteristics
      2. 3.1.2 Conversion Efficiency
      3. 3.1.3 Operating Waveforms
        1. 3.1.3.1 Switching
        2. 3.1.3.2 Load Transient Response
        3. 3.1.3.3 Short-Circuit Recovery
        4. 3.1.3.4 Start-Up and Shutdown With EN
        5. 3.1.3.5 Start-Up With VIN
      4. 3.1.4 Bode Plot
      5. 3.1.5 CISPR 25 EMI Performance
      6. 3.1.6 Thermal Performance
  9. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layout
      1. 4.2.1 Component Drawings
      2. 4.2.2 Multi-Layer Stackup
    3. 4.3 Bill of Materials
  10. 5Compliance Information
    1. 5.1 Compliance and Certifications
  11. 6Related Documentation
    1. 6.1 Supplemental Content
      1. 6.1.1 Development Support
      2. 6.1.2 PCB Layout Resources
      3. 6.1.3 Thermal Design Resources
  12. 7Additional Information
    1. 7.1 Trademarks

2.1.1 EVM Connections

Referencing the EVM connections described in Table 2-1, the recommended test setup to evaluate the LM65680-Q1 is shown in Figure 2-1. Working at an ESD-protected workstation, make sure that any wrist straps, boot straps, or mats are connected and referencing the user to earth ground before handling and applying power to the EVM.

Figure 2-1 EVM Test Setup
Note:

Refer to the LM65680-Q1 70V, 8A, Automotive Buck Converter Optimized for Low EMI and High Power Density data sheet, LM65680-Q1 Quickstart Calculator, and WEBENCH® Power Designer for additional guidance pertaining to component selection and converter operation.

Table 2-1 EVM Power Connections
LABELDESCRIPTION
VIN+Positive input power connection
VIN–Negative input power connection
VOUT+Positive output power connection
VOUT–Negative output power connection
Table 2-2 EVM Signal Connections
LABEL DESCRIPTION
PG Power-Good indicator
BIAS Input to internal voltage regulator. Connect to VOUT or optional external bias supply for higher efficiency
VOUT Output voltage
VCC Internal regulator output. Do not connect this pin to any external loads.
CONFIG Loop compensation selection. Connect CONFIG to VCC for internal compensation. Floating the CONFIG pin or connecting CONFIG to GND for external compensation.
GND GND connection
INJ 50Ω injection point for loop response
GND GND connection
EN ENABLE input – tie to GND to disable the device
VIN Input voltage
VAUX Requires functional safety IC variant. Auxiliary pull-up voltage for nFault. Connect to VIN, VCC, or optional external bias supply.
VCC Internal regulator output. Do not connect this pin to any external loads.
VCC Internal regulator output. Do not connect this pin to any external loads.
MODE/SYNC PFM / FPWM selection and synchronization input. Connect MODE/SYNC to GND for AUTO mode or to VCC for FPWM mode. The MODE/SYNC pin can also be driven by an external synchronization clock signal to operate in FPWM mode.
GND GND connection
nFAULT Requires functional safety IC variant. Test point used to monitor if any faults has occurred in the regulator or the system. nFAULT is an active low fault signal.