Datasheet > CRCW060316K2FKEA

CRCW060316K2FKEA

更新时间： 2024-09-15 09:31:35

品牌	Logo	应用领域
美国国家半导体 - NSC		转换器升压转换器
页数	文件大小	规格书
8页	601K
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Evaluation Board Reference Design integrates a boost converter

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CRCW060316K2FKEA 数据手册

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

301233

www.national.com

12 3 4 5 6 7 8

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与CRCW060316K2FKEA相关器件

型号	品牌	获取价格	描述	数据表
CRCW060316K2FKEAC	VISHAY	获取价格	Fixed Resistor, Metal Glaze/thick Film, 0.1W, 16200ohm, 75V, 1% +/-Tol, 100ppm/Cel, Surfac
CRCW060316K2FKEAHP	VISHAY	获取价格	RES SMD 16.2K OHM 1% 1/4W 0603
CRCW060316K2FKEB	VISHAY	获取价格	RES SMD 16.2K OHM 1% 1/10W 0603
CRCW060316K2FKEBC	VISHAY	获取价格	RES 16.2K OHM 1% 1/10W 0603
CRCW060316K2FKEC	VISHAY	获取价格	RES SMD 16.2K OHM 1% 1/10W 0603
CRCW060316K2FKTC	VISHAY	获取价格	RES SMD 16.2K OHM 1% 1/10W 0603
CRCW060316K5CHEDP	VISHAY	获取价格	Fixed Resistor, Metal Glaze/thick Film, 0.1W, 16500ohm, 75V, 0.25% +/-Tol, 50ppm/Cel, Surf
CRCW060316K5FKEA	VISHAY	获取价格	6 A, microBUCK SiC414, SiC424 Integrated Buck Regulator with 5 V LDO
CRCW060316K5FKEAC	VISHAY	获取价格	RES 16.5K OHM 1% 1/10W 0603
CRCW060316K5FKEAHP	VISHAY	获取价格	暂无描述

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