Texas Instruments LM3152 - RD-164 - Demonstration Board LM3152-3.3DEMO LM3152-3.3DEMO Scheda Tecnica

National Semiconductor
RD-164
Maurice Eaglin
October 2008

VinMin=6V

Vout1=3.3V

VinMax=24V

Iout1=10A

The LM3152-3.3 demonstration board is part of the Power-
Wise® family of SIMPLE SWITCHER® Controllers.  It has
been designed to balance solution size and performance. 
The Constant-On-Time (COT) Emulated Ripple Mode (ERM)
Control allows for the use of low ESR output capacitors and
therefore decreases the output voltage ripple while maintain-
ing a fast transient response.  There is no loop compensation
required for the COT architecture, as there is in voltage-mode
and current mode control architectures, which helps to facili-
tate the ease of design and fast transient response.  The
demo board uses a 2-layer, 2 ounce copper PCB with all of
the components mounted on the top side.  The LM3152-3.3
IC has a fixed output voltage of 3.3V and will operate over the
input voltage range of 6V to 24V at 10A load current.  The
components within the dashed line of the board photo in Fig-
ure 3, represent the total design solution.  The aluminum
electrolytic input capacitor Cin1 is used for input filter damping
when using long leads,  which contributes to parasitic induc-

tance in the lab while using the demo board.  Cin1 along with
the input/output posts and EN test point connector may not
be needed when the final circuit is integrated in the system
design.

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Easy To Use with Webench and Offline Design Tools 

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No Loop Compensation Required

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Low Solution Component Count

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Ultra-Fast Transient Response

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Low Output Voltage Ripple (32mVpp)

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3.3V Fixed Output Voltage

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Optimized for 10A Average Load Current

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95% Peak Efficiency

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Constant-On-Time with Emulated Ripple Mode Control

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500kHz Switching Frequency

 

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