- 您现在的位置：买卖IC网 > PDF目录17146 > LM3423MHBKBSTEV/NOPB (National Semiconductor)BOARD EVAL BUCK BOOST LM3423 PDF资料下载
参数资料
| 型号： | LM3423MHBKBSTEV/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 27/67页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL BUCK BOOST LM3423 |
| 标准包装： | 1 |
| 系列： | PowerWise® |
| 电流 - 输出 / 通道： | 1A |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 35V |
| 特点： | 可调光 |
| 输入电压： | 4.5 ~ 35 V |
| 已供物品： | 板 |
| 已用 IC / 零件： | LM3423 |
| 其它名称： | LM3423MHBKBSTEV |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页当前第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页
Boost Inrush Diode
SNVS574E – JULY 2008 – REVISED MAY 2013
V IN
L1
D1
V O
Q1
Figure 35. Boost Topology with Inrush Diode
CIRCUIT LAYOUT
The performance of any switching regulator depends as much upon the layout of the PCB as the component
selection. Following a few simple guidelines will maximimize noise rejection and minimize the generation of EMI
within the circuit.
Discontinuous currents are the most likely to generate EMI, therefore care should be taken when routing these
paths. The main path for discontinuous current in the LM3421/23 buck regulator contains the input capacitor
(C IN ), the recirculating diode (D1), the N-channel MosFET (Q1), and the sense resistor (R LIM ). In the LM3421/23
boost regulator, the discontinuous current flows through the output capacitor (C O ), D1, Q1, and R LIM . In the buck-
boost regulator both loops are discontinuous and should be carefully layed out. These loops should be kept as
small as possible and the connections between all the components should be short and thick to minimize
parasitic inductance. In particular, the switch node (where L1, D1 and Q1 connect) should be just large enough
to connect the components. To minimize excessive heating, large copper pours can be placed adjacent to the
short current path of the switch node.
The RT, COMP, CSH, IS, HSP and HSN pins are all high-impedance inputs which couple external noise easily,
therefore the loops containing these nodes should be minimized whenever possible.
In some applications the LED or LED array can be far away (several inches or more) from the LM3421/23, or on
a separate PCB connected by a wiring harness. When an output capacitor is used and the LED array is large or
separated from the rest of the regulator, the output capacitor should be placed close to the LEDs to reduce the
effects of parasitic inductance on the AC impedance of the capacitor.
Copyright ? 2008–2013, Texas Instruments Incorporated
27
Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1
相关PDF资料 |
PDF描述 |
|---|---|
| EEM06DRST-S288 | CONN EDGECARD 12POS .156 EXTEND |
| HPL1005-13N | INDUCTOR 13NH 2% 0402 SMD |
| MC33342DR2G | IC CTRLR BATTERY FAST CHRG 8SOIC |
| 18R683C | INDUCTOR RADIAL 68UH 1.35A |
| EEV-FC1C470P | CAP ALUM 47UF 16V 20% SMD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM3423MHBSTEVAL | 制造商:Texas Instruments 功能描述:N-Channel Controllers For Constant Current LED Drivers Evaluation Board |
| LM3423MHBSTEVAL/NOPB | 功能描述:BOARD EVAL BOOST FOR LM3423 RoHS:是 类别:编程器，开发系统 >> 评估板 - LED 驱动器 系列:PowerWise® 标准包装:1 系列:PowerWise® 电流 - 输出 / 通道:20mA 输出及类型:1，非隔离 输出电压:17V 特点:可调光 输入电压:2.7 ~ 5.5 V 已供物品:板 已用 IC / 零件:LM3508 相关产品:LM3508TLX-ND - IC LED DRVR WHT BCKLGT 9USMDLM3508TLDKR-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLCT-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLTR-ND - IC LED DRVR WHT BCKLGT 9MICROSMD |
| LM3423MHX | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| LM3423MHX/NOPB | 功能描述:LED照明驱动器 RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| LM3423Q0 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:N-Channel Controllers for Constant Current LED Drivers |
发布紧急采购，3分钟左右您将得到回复。