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| 型号： | LM2735YSDEVAL |
| 厂商： | National Semiconductor |
| 文件页数： | 25/58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
SEPIC Converter
The LM2735 can easily be converted into a SEPIC converter. A SEPIC converter has the ability to regulate an
output voltage that is either larger or smaller in magnitude than the input voltage. Other converters have this
ability as well (CUK and Buck-Boost), but usually create an output voltage that is opposite in polarity to the input
voltage. This topology is a perfect fit for Lithium Ion battery applications where the input voltage for a single cell
Li-Ion battery will vary between 3V & 4.5V and the output voltage is somewhere in between. Most of the analysis
of the LM2735 Boost Converter is applicable to the LM2735 SEPIC Converter.
SEPIC Design Guide:
SEPIC Conversion ratio without loss elements:
V o
V IN
=
D
D'
(49)
Therefore:
D=
V O
V O + V IN
(50)
Small ripple approximation:
In a well-designed SEPIC converter, the output voltage, and input voltage ripple, the inductor ripple and is small
in comparison to the DC magnitude. Therefore it is a safe approximation to assume a DC value for these
components. The main objective of the Steady State Analysis is to determine the steady state duty-cycle, voltage
and current stresses on all components, and proper values for all components.
In a steady-state converter, the net volt-seconds across an inductor after one cycle will equal zero. Also, the
charge into a capacitor will equal the charge out of a capacitor in one cycle.
Therefore:
= ¨ ' ? x I L1
I L2
§ D ·
? D 1
and
§ D · x § V O ·
¨ D ' ? ¨ R ?
I L1 =
? 1 ? 1
(51)
Substituting I L1 into I L2
I L2 =
V O
R
(52)
The average inductor current of L2 is the average output load.
V L ( t )
AREA 1
DT S
AREA 2
T S
t (s)
Figure 32. Inductor Volt-Sec Balance Waveform
Copyright ? 2007–2013, Texas Instruments Incorporated
Product Folder Links: LM2735
25
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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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