SNVA389B July   2009  – February 2022 LM3000

 

  1.   Trademarks
  2. 1Introduction
  3. 2Powering and Loading Considerations
    1. 2.1 Quick Setup Procedure
  4. 3Board Configuration
    1. 3.1 External Clock Synchronization
    2. 3.2 CLKOUT
    3. 3.3 Tracking
    4. 3.4 Output Voltage Ripple
  5. 4Typical Performance Waveforms
  6. 5Evaluation Board Schematic
  7. 6Bill of Materials
  8. 7PCB Layout
  9. 8Revision History

1 Introduction

The LM3000 evaluation board is designed to provide the design engineer with a fully functional power converter-based solution using the LM3000 dual output emulated current mode controller. This evaluation board provides two output voltages of 3.3 V and 1.2 V. The 3.3-V output is designed to handle a maximum current of 8 A, whereas the 1.2-V output has a maximum current capability of 15 A. The switching frequency for the converter is set at 500 kHz. The gate signals for each output voltage will be 180 degree out of phase from each other. The printed circuit board consists of four layers of FR4 material with 2-ounce copper on top and bottom layer and 1-ounce copper for internal layers. This user's guide contains the evaluation board schematic, bill of materials (BOM), and a quick setup procedure. Refer to the LM3000 Dual Synchronous Emulated Current-Mode Controller data sheet for complete circuit design information.

The performance of the evaluation board is as follows:

Input Range 6 V to 18 V
Output voltage 1 (VO1) 3.3 V
Output current 1 0 A to 8 A
Output voltage 2 (VO2) 1.2 V
Output current 2 0 A to 15 A
Switching frequency 500 kHz
Load regulation 1%
Board size 2.68 × 3.146 × 0.068 inches