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| 型号： | LM3102EVAL |
| 厂商： | National Semiconductor |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION LM3102 |
| 标准包装： | 1 |
| 系列： | PowerWise®, SIMPLE SWITCHER® |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 3.3V |
| 电流 - 输出： | 2.5A |
| 输入电压： | 8 ~ 42 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 500kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板，文档 |
| 已用 IC / 零件： | LM3102 |
| 相关产品： | LM3102MHX-ND - IC REG BUCK SYNC ADJ 20-TSSOP LM3102MH-ND - IC REG BUCK SYNC ADJ 20TSSOP |
SNVS515G – SEPTEMBER 2007 – REVISED JANUARY 2012
R ON : Equation 2 can be used to select R ON if a desired operating frequency is selected. But the minimum value
of R ON is determined by the minimum on-time. It can be calculated as follows:
R ON t
V IN(MAX) x 150 ns
1.3 x 10 -10
(8)
If R ON calculated from Equation 2 is smaller than the minimum value determined in Equation 8 , a lower frequency
should be selected to re-calculate R ON by Equation 2 . Alternatively, V IN(MAX) can also be limited in order to keep
On the other hand, the minimum off-time of 260 ns can limit the maximum duty ratio. Larger R ON should be
selected in any application requiring large duty ratio.
Figure 27. Maximum V IN for selected R ON
L: The main parameter affected by the inductor is the amplitude of inductor current ripple (I LR ). Once I LR is
selected, L can be determined by:
L=
V OUT x (V IN - V OUT )
I LR x f SW x V IN
where
?
V IN is the maximum input voltage
?
(9)
where and .
If the output current I OUT is determined, by assuming that I OUT = I L , the higher and lower peak of I LR can be
determined. Beware that the higher peak of I LR should not be larger than the saturation current of the inductor
and current limits of the main and synchronous MOSFETs. Also, the lower peak of I LR must be positive if CCM
operation is required.
Figure 28. Inductor selection for V OUT = 3.3V
Copyright ? 2007–2012, Texas Instruments Incorporated
Product Folder Links: LM3102
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM3102EVAL/NOPB | 功能描述:电源管理IC开发工具 LM3102 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 |
| LM3102MH | 制造商:Texas Instruments 功能描述:IC, V REG, SYNCH, 2.5A, POWERWISE |
| LM3102MH/NOPB | 功能描述:直流/直流开关调节器 SYNC 1MHZ 2.5A STEP- DOWN VLTG REG 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 |
| LM3102MHX | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Down 4.5V to 42V 20-Pin TSSOP EP T/R |
| LM3102MHX/NOPB | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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