- 您现在的位置：买卖IC网 > PDF目录20486 > LMZ14201EVAL/NOPB (National Semiconductor)EVAL BOARD FOR LMZ14201 PDF资料下载
参数资料
| 型号： | LMZ14201EVAL/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 15/27页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR LMZ14201 |
| 产品培训模块： | SIMPLE SWITCHER Power Modules |
| 标准包装： | 1 |
| 系列： | 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： | 1A |
| 输入电压： | 6 ~ 24 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 最高 1MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | LMZ14201 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页当前第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页
LMZ14201
www.ti.com
SNVS649F – JANUARY 2010 – REVISED OCTOBER 2013
Following is a comparison pair of waveforms of the showing both CCM (upper) and DCM operating modes.
Figure 33. CCM and DCM Operating Modes
V IN = 12V, V O = 3.3V, I O = 1 A / 0.25 A
500 mA/Div
2.00 2 s/Div
The approximate formula for determining the DCM/CCM boundary is as follows:
I DCB ? V O *(V IN –V O )/(2*10 μ H*f SW(CCM) *V IN )
Following is a typical waveform showing the boundary condition.
Figure 34. Transition Mode Operation
V IN = 24V, V O = 3.3V, I O = 0.29 A
(16)
500 mA/Div
2.00 2 s/Div
The inductor internal to the module is 10 μ H. This value was chosen as a good balance between low and high
input voltage applications. The main parameter affected by the inductor is the amplitude of the inductor ripple
current (I LR ). I LR can be calculated with:
I LR P-P =V O *(V IN - V O )/(10μH*f SW *V IN )
(17)
Where V IN is the maximum input voltage and f SW is determined from Equation 10 .
If the output current I O is determined by assuming that I O = I L , the higher and lower peak of I LR can be
determined. Be aware that the lower peak of I LR must be positive if CCM operation is required.
POWER DISSIPATION AND BOARD THERMAL REQUIREMENTS
For the design case of V IN = 24V, V O = 3.3V, I O = 1A, T AMB(MAX) = 85°C , and T JUNCTION = 125°C, the device must
see a thermal resistance from case to ambient of less than:
θ CA < (T J-MAX — T AMB(MAX) ) / P IC-LOSS - θ JC
(18)
Given the typical thermal resistance from junction to case to be 1.9 °C/W. Use the 85°C power dissipation curves
in the Typical Performance Characteristics section to estimate the P IC-LOSS for the application being designed. In
this application it is 0.52W.
θ CA = (125 — 85) / 0.52W — 1.9 = 75
To reach θ CA = 75, the PCB is required to dissipate heat effectively. With no airflow and no external heat, a good
estimate of the required board area covered by 1 oz. copper on both the top and bottom metal layers is:
Board Area_cm 2 = 500°C x cm 2 /W / θ JC
(19)
Copyright ? 2010–2013, Texas Instruments Incorporated
Product Folder Links: LMZ14201
Submit Documentation Feedback
15
相关PDF资料 |
PDF描述 |
|---|---|
| RH-1505D/HP | CONV DC/DC 1W 15VIN +/-05VOUT |
| 345-060-520-201 | CARDEDGE 60POS DUAL .100 GREEN |
| A3940KLWTR-T | IC CTRLR MOSFET FULL 28-SOIC |
| RMA06DTMS | CONN EDGECARD 12POS R/A .125 SLD |
| MIC4424BN | IC DRIVER MOSFET 3A DUAL 8DIP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LMZ14201EXT | 制造商:NSC 制造商全称:National Semiconductor 功能描述:1A SIMPLE SWITCHER? Power Module with 42V Maximum Input Voltage for Military and Rugged Applications |
| LMZ14201EXTEVAL/NOPB | 功能描述:电源管理IC开发工具 LMZ14201EXT 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 |
| LMZ14201EXTTZ | 制造商:NSC 制造商全称:National Semiconductor 功能描述:1A SIMPLE SWITCHER? Power Module with 42V Maximum Input Voltage for Military and Rugged Applications |
| LMZ14201EXTTZ/NOPB | 功能描述:直流/直流开关转换器 1A SIMPLE SWITCHER POWER MOD, 42V MAX 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 |
| LMZ14201EXTTZE | 制造商:NSC 制造商全称:National Semiconductor 功能描述:1A SIMPLE SWITCHER? Power Module with 42V Maximum Input Voltage for Military and Rugged Applications |
发布紧急采购，3分钟左右您将得到回复。