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| 型号： | LM2735YMFX/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 15/58页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SEPIC ADJ SOT23-5 |
| 标准包装： | 3,000 |
| 类型： | 升压（升压），Sepic |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 3 V ~ 24 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 520kHz |
| 电流 - 输出： | 2.1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | SOT-23-5 |
| 配用： | LM2735SD3.3EVAL-ND - BOARD EVALUATION FOR LM2735 |
| 其它名称： | LM2735YMFX |
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V FB
R 2
V O
C 3
R LOAD
SNVS485F – JUNE 2007 – REVISED APRIL 2013
R 1
Figure 25. Setting External Pole-Zero
F ZERO - CF =
1
2 S ( R 2 x C 3 )
(14)
There is an associated pole with the zero that was created in the above equation.
F POLE - CF =
1
2 S ((R 1 R 2 ) x C 3 )
(15)
It is always higher in frequency than the zero.
A right-half plane zero (RHPZ) is inherent to all boost converters. One must remember that the gain associated
with a right-half plane zero increases at 20dB per decade, but the phase decreases by 45° per decade. For most
applications there is little concern with the RHPZ due to the fact that the frequency at which it shows up is well
beyond crossover, and has little to no effect on loop stability. One must be concerned with this condition for large
inductor values and high output currents.
( D ' ) R Load
RHP ZERO =
2
2 S x L
(16)
There are miscellaneous poles and zeros associated with parasitics internal to the LM2735, external
components, and the PCB. They are located well over the crossover frequency, and for simplicity are not
discussed.
PCB Layout Considerations
When planning layout there are a few things to consider when trying to achieve a clean, regulated output. The
most important consideration when completing a Boost Converter layout is the close coupling of the GND
connections of the C OUT capacitor and the LM2735 PGND pin. The GND ends should be close to one another
and be connected to the GND plane with at least two through-holes. There should be a continuous ground plane
on the bottom layer of a two-layer board except under the switching node island. The FB pin is a high impedance
node and care should be taken to make the FB trace short to avoid noise pickup and inaccurate regulation. The
feedback resistors should be placed as close as possible to the IC, with the AGND of R1 placed as close as
possible to the GND (pin 5 for the WSON) of the IC. The V OUT trace to R2 should be routed away from the
inductor and any other traces that are switching. High AC currents flow through the V IN , SW and V OUT traces, so
they should be as short and wide as possible. However, making the traces wide increases radiated noise, so the
designer must make this trade-off. Radiated noise can be decreased by choosing a shielded inductor. The
remaining components should also be placed as close as possible to the IC. Please see Application Note AN-
1229 SNVA054 for further considerations and the LM2735 demo board as an example of a four-layer layout.
Copyright ? 2007–2013, Texas Instruments Incorporated
Product Folder Links: LM2735
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2735YMY | 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 |
| LM2735YMY/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 |
| LM2735YMYEVAL | 功能描述:电源管理IC开发工具 LM2735YMY EVAL BOARD RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| LM2735YMYEVAL | 制造商:Texas Instruments 功能描述:EVAL BOARD, LM2735Y 12V, 500mA SEPIC CON |
| LM2735YMYX | 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 |
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