Texas Instruments Emulated Peak Current Mode Buck Controller for Low Output Voltage LM3495EVAL/NOPB LM3495EVAL/NOPB Scheda Tecnica
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LM3495EVAL/NOPB
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User's Guide
SNVA149B – March 2006 – Revised April 2013
AN-1446 LM3495 Evaluation Board
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Specifications Of The Board
The evaluation board has been designed for testing of various circuits using the LM3495 buck regulator
controller. A complete schematic for all the components is shown in
controller. A complete schematic for all the components is shown in
. The board is four layers,
consisting of signal/power traces on top and bottom, one internal ground plane, and an internal split power
plane. The top and bottom planes are 1oz. copper, internal planes are 1/2 oz., and the board is 62mil FR4
laminate.
plane. The top and bottom planes are 1oz. copper, internal planes are 1/2 oz., and the board is 62mil FR4
laminate.
2
Example Circuit
The example circuit that comes on the evaluation board steps input voltages of 12V ±10% down to 1.2V at
currents up to 10A with a switching frequency of 500 kHz. The measured efficiency of the converter is
86% at an output current of 7A.
currents up to 10A with a switching frequency of 500 kHz. The measured efficiency of the converter is
86% at an output current of 7A.
Figure 1. Efficiency for V
IN
= 12V
3
Powering The Converter
The example circuit for the LM3495 evaluation board is optimized to run at inputs of 12V, however the
circuit will operate with input voltages ranging from 2.9V to 18.0V connected between the ‘Vin’ and ‘GND’
terminals at the top of the board. Fixed loads, resistors, and variable electronic loads can be connected
between the ‘Vo’ and ‘GND’ terminals.
circuit will operate with input voltages ranging from 2.9V to 18.0V connected between the ‘Vin’ and ‘GND’
terminals at the top of the board. Fixed loads, resistors, and variable electronic loads can be connected
between the ‘Vo’ and ‘GND’ terminals.
lists all the components used in the example circuit.
4
Enabling The Converter
The SPDT switch ON/OFF controls the state of the converter while power is applied to the input terminals.
While in the OFF position the COMP/SD* pin of the LM3495 is grounded, the output is disabled, and the
IC enters a low power state. While in the ON position the output voltage is regulated and is capable of
delivering current to a load connected at the output terminals.
While in the OFF position the COMP/SD* pin of the LM3495 is grounded, the output is disabled, and the
IC enters a low power state. While in the ON position the output voltage is regulated and is capable of
delivering current to a load connected at the output terminals.
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SNVA149B – March 2006 – Revised April 2013
AN-1446 LM3495 Evaluation Board
Copyright © 2006–2013, Texas Instruments Incorporated