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| 型号： | LM2735YSDEVAL |
| 厂商： | National Semiconductor |
| 文件页数： | 10/58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
CURRENT LIMIT
The LM2735 uses cycle-by-cycle current limiting to protect the internal NMOS switch. It is important to note that
this current limit will not protect the output from excessive current during an output short circuit. The input supply
is connected to the output by the series connection of an inductor and a diode. If a short circuit is placed on the
output, excessive current can damage both the inductor and diode.
Design Guide
ENABLE PIN / SHUTDOWN MODE
The LM2735 has a shutdown mode that is controlled by the Enable pin (EN). When a logic low voltage is applied
to EN, the part is in shutdown mode and its quiescent current drops to typically 80 nA. Switch leakage adds up to
another 1 μA from the input supply. The voltage at this pin should never exceed V IN + 0.3V.
THERMAL SHUTDOWN
Thermal shutdown limits total power dissipation by turning off the output switch when the IC junction temperature
exceeds 160°C. After thermal shutdown occurs, the output switch doesn’t turn on until the junction temperature
drops to approximately 150°C.
SOFT-START
This function forces V OUT to increase at a controlled rate during start up. During soft-start, the error amplifier’s
reference voltage ramps to its nominal value of 1.255V in approximately 4.0ms. This forces the regulator output
to ramp up in a more linear and controlled fashion, which helps reduce inrush current.
INDUCTOR SELECTION
The Duty Cycle (D) can be approximated quickly using the ratio of output voltage (V O ) to input voltage (V IN ):
1 - D ?1
V OUT
V IN
§ 1 ·
= ¨
?
=
1
D c
(1)
10
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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