Texas Instruments LM3000, User Manual

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User’s Guide
LM3000 Buck Controller Evaluation Module User's Guide
Table of Contents
1 Introduction ............................................................................................................................................................................. 2
2 Powering and Loading Considerations ................................................................................................................................ 3
2.1 Quick Setup Procedure...................................................................................................................................................... 3
3 Board Configuration ............................................................................................................................................................... 4
3.1 External Clock Synchronization......................................................................................................................................... 4
3.2 CLKOUT............................................................................................................................................................................. 4
3.3 Tracking.............................................................................................................................................................................. 4
3.4 Output Voltage Ripple........................................................................................................................................................ 5
4 Typical Performance Waveforms .......................................................................................................................................... 6
5 Evaluation Board Schematic ................................................................................................................................................. 7
6 Bill of Materials ....................................................................................................................................................................... 8
7 PCB Layout ............................................................................................................................................................................ 10
8 Revision History ................................................................................................................................................................... 13
List of Figures
Figure 2-1. Basic Test Setup for LM3000EVAL Board................................................................................................................. 3
Figure 3-1. Synchronization at 3.3-V Output............................................................................................................................... 4
Figure 3-2. Tracking with an External Ramp for 3.3-V Output..................................................................................................... 5
Figure 3-3. Output Voltage Ripple Measurement Setup.............................................................................................................. 5
Figure 4-1. Efficiency of 3.3-V Output at 500 kHz........................................................................................................................ 6
Figure 4-2. Efficiency of 1.2-V Output at 500 kHz........................................................................................................................ 6
Figure 4-3. Output Ripple Voltage for 3.3-V Output at 8-A Load................................................................................................. 6
Figure 4-4. Output Ripple Voltage for 1.2-V Output at 15-A Load............................................................................................... 6
Figure 4-5. Output Load Transient from 0 A to 6 A for 3.3-V Output........................................................................................... 6
Figure 4-6. Output Load Transient from 0 A to 10 A for 1.2-V Output......................................................................................... 6
Figure 5-1. Evaluation Board Full Schematic.............................................................................................................................. 7
Figure 7-1. Top Overlay as Viewed from Top............................................................................................................................. 10
Figure 7-2. Top Layer as Viewed from Top................................................................................................................................ 10
Figure 7-3. Bottom Overlay as Viewed from Top....................................................................................................................... 11
Figure 7-4. Bottom Layer as Viewed from Top........................................................................................................................... 11
Figure 7-5. Internal Layer 1 as Viewed from Top....................................................................................................................... 12
Figure 7-6. Internal Layer 2 as Viewed from Top....................................................................................................................... 12
List of Tables
Table 6-1. Bill of Materials............................................................................................................................................................ 8
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SNVA389B – JULY 2009 – REVISED FEBRUARY 2022
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LM3000 Buck Controller Evaluation Module User's Guide 1
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