Texas Instruments SIMPLE SWITCHER® Synchronous 1MHz 0.75A Step-Down Voltage Regulator Evaluation Module LM3103EVAL/NOPB LM3103EVAL/NOPB 数据表
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LM3103EVAL/NOPB
User's Guide
SNVA268A – October 2007 – Revised April 2013
AN-1678 LM3103 Demonstration Board Reference Design
1
Introduction
The LM3103 Step Down Switching Regulator features all required functions to implement a cost effective,
efficient buck power converter capable of supplying 0.75A to loads. The Constant On-Time (COT)
regulation scheme requires no loop compensation, results in a fast load transient response and simple
circuit implementation which allows a low component count, and consequently very small overall board
space is required for a typical application. The regulator can function properly even with an all ceramic
output capacitor network, and does not rely on the output capacitor’s ESR for stability. The operating
frequency remains constant with line variations due to the inverse relationship between the input voltage
and the on-time. Protection features include output over-voltage protection, thermal shutdown, V
efficient buck power converter capable of supplying 0.75A to loads. The Constant On-Time (COT)
regulation scheme requires no loop compensation, results in a fast load transient response and simple
circuit implementation which allows a low component count, and consequently very small overall board
space is required for a typical application. The regulator can function properly even with an all ceramic
output capacitor network, and does not rely on the output capacitor’s ESR for stability. The operating
frequency remains constant with line variations due to the inverse relationship between the input voltage
and the on-time. Protection features include output over-voltage protection, thermal shutdown, V
CC
under-
voltage lock-out, gate drive under-voltage lock-out. The LM3103 is available in the thermally enhanced
HTSSOP-16 package.
HTSSOP-16 package.
2
Demonstration Board Schematic and PCB
Figure 1. LM3103 Demonstration Board Schematic
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1
SNVA268A – October 2007 – Revised April 2013
AN-1678 LM3103 Demonstration Board Reference Design
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