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| 型号： | LM2735YSDEVAL |
| 厂商： | National Semiconductor |
| 文件页数： | 24/58页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL LM2735 520KHZ 6LLP |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步升 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 12V |
| 电流 - 输出： | 500mA |
| 输入电压： | 3 ~ 5.5 V |
| 稳压器拓扑结构： | 升压 |
| 频率 - 开关： | 520kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | LM2735 |
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SNVS485F – JUNE 2007 – REVISED APRIL 2013
Example from previous calculations:
Pdiss = 475 mW
Ta @ Shutdown = 139°C
Tc @ Shutdown = 155°C
R T JA =
T J - T A
P Dissipatio n
: R < JC =
T J - T Case-Top
P Dissipatio n
(48)
R θ JA WSON = 55°C/W
R ψ JC WSON = 21°C/W
WSON & MSOP-PowerPAD typical applications will produce R θ JA numbers in the range of 50°C/W to 65°C/W,
and R ψ JC will vary between 18°C/W and 28°C/W. These values are for PCB’s with two and four layer boards with
0.5 oz copper, and four to six thermal vias to bottom side ground plane under the DAP.
For 5-pin SOT-23 package typical applications, R θ JA numbers will range from 80°C/W to 110°C/W, and R ψ JC will
vary between 50°C/W and 65°C/W. These values are for PCB’s with two & four layer boards with 0.5 oz copper,
with two to four thermal vias from GND pin to bottom layer.
Here is a good rule of thumb for typical thermal impedances, and an ambient temperature maximum of 75°C: If
your design requires that you dissipate more than 400mW internal to the LM2735, or there is 750mW of total
power loss in the application, it is recommended that you use the 6 pin WSON or the 8 pin MSOP-PowerPAD
package.
NOTE
NOTE: To use these procedures it is important to dissipate an amount of power within the
device that will indicate a true thermal impedance value. If one uses a very small internal
dissipated value, one can see that the thermal impedance calculated is abnormally high,
and subject to error. The graph below shows the nonlinear relationship of internal power
dissipation vs R θ JA .
500
450
400
350
300
250
200
150
100
50
0
0
0.1
0.2
0.3 0.4
0.5 0.6
0.7 0.8
P DISS
Figure 31. R θ JA vs Internal Dissipation for the WSON
and MSOP-PowerPAD Package
24
Product Folder Links: LM2735
Copyright ? 2007–2013, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2735YSDEVAL | 制造商:Texas Instruments 功能描述:EVAL BOARD, LM2735Y 12V, 500mA SEPIC CON |
| LM2735YSDX | 制造商:NSC 制造商全称:National Semiconductor 功能描述:520kHz/1.6MHz - Space-Efficient Boost and SEPIC DC-DC Regulator |
| LM2735YSDX/NOPB | 功能描述:直流/直流开关调节器 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| LM2736 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Thin SOT23 750mA Load Step-Down DC-DC Regulator |
| LM2736X | 制造商:TI 制造商全称:Texas Instruments 功能描述:LM2736 Thin SOT 750mA Load Step-Down DC-DC Regulator |
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