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GRM32ER72A225KA35L

更新时间： 2024-11-05 12:46:23
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美国国家半导体 - NSC 转换器升压转换器
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8页 607K
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Evaluation Board Reference Design integrates a boost converter

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National Semiconductor  
Application Note 2056  
L.K. Wong  
LM3492 Evaluation Board  
Reference Design  
September 21, 2010  
DHC also facilitates a single BOM for different number of LED  
in a string, which is required for backlight panels of different  
size, thereby reducing overall development time and cost.  
The LM3492 comes with a versatile COMM pin which serves  
as a bi-directional I/O pin interfacing with an external MCU for  
the following functions: power-good, over-temperature, IOUT  
over- and under-voltage indications, switching frequency tun-  
ing, and channel 1 disabling. Other supervisory functions of  
the LM3492 include precise enable, VCC under-voltage lock-  
out, current regulator Over-Power protection, and thermal  
shutdown protection. The LM3492 is available in the thermally  
enhanced eTSSOP-20 package.  
Introduction  
The LM3492 integrates a boost converter and a two-channel  
current regulator to implement a high efficient and cost effec-  
tive LED driver for driving two individually dimmable LED  
strings with a maximum power of 15W and an output voltage  
of up to 65V. The boost converter employs a proprietary Pro-  
jected-On-Time control method to give a fast transient re-  
sponse with no compensation required, and a nearly constant  
switching frequency programmable from 200 kHz to 1 MHz.  
The application circuit is stable with ceramic capacitors and  
produces no audible noise on dimming. The programmable  
peak current limit and soft-start features reduce current  
surges at startup, and an integrated 190 mΩ, 3.9A N-Channel  
MOSFET switch minimizes the solution size. The fast slew  
rate current regulator allows high frequency and narrow pulse  
width dimming signals to achieve a very high contrast ratio of  
1000:1 at a dimming frequency of more than 3 kHz. The LED  
current is programmable from 50 mA to 200 mA by a single  
resistor.  
This application note details the design of a LM3492 evalua-  
tion board which drives 2 LED strings, each of which consists  
of 10 LEDs running at 150 mA and the forward voltage of each  
LED is typically 3.8V. The input voltage is from 9V to 16V. The  
evaluation board schematic, PCB layout, Bill of Materials, and  
circuit design descriptions are shown. Typical performance  
and operating waveforms are also provided for reference.  
To maximize the efficiency, Dynamic Headroom Control  
(DHC) automatically adjusts the output voltage to a minimum.  
Evaluation Board Schematic and PCB Layout  
30123301  
FIGURE 1. LM3492 Evaluation Board Schematic  
© 2010 National Semiconductor Corporation  
301233  
www.national.com  
12345678

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