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参数资料
| 型号： | LMR10510YSDDEMO/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 15/26页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR LMR10510 |
| 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： | 1.8V |
| 电流 - 输出： | 1A |
| 输入电压： | 3 V ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 3MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | LMR10510 |
SNVS727B – OCTOBER 2011 – REVISED APRIL 2013
The first step is to determine R θ JA of the application. The LMR10510 has over-temperature protection circuitry.
When the silicon temperature reaches 165°C, the device stops switching. The protection circuitry has a
hysteresis of about 15°C. Once the silicon temperature has decreased to approximately 150°C, the device will
start to switch again. Knowing this, the R θ JA for any application can be characterized during the early stages of
the design one may calculate the R θ JA by placing the PCB circuit into a thermal chamber. Raise the ambient
temperature in the given working application until the circuit enters thermal shutdown. If the SW-pin is monitored,
it will be obvious when the internal PFET stops switching, indicating a junction temperature of 165°C. Knowing
the internal power dissipation from the above methods, the junction temperature, and the ambient temperature
R θ JA can be determined.
R T JA =
165° - Ta
P INTERNAL
Once this is determined, the maximum ambient temperature allowed for a desired junction temperature can be
found.
An example of calculating R θ JA for an application using the LMR10510 is shown below.
A sample PCB is placed in an oven with no forced airflow. The ambient temperature was raised to 147°C, and at
that temperature, the device went into thermal shutdown.
From the previous example:
P INTERNAL = 149 mW
R T JA =
165°C - 147°C
149 mW
= 121°C/W
Since the junction temperature must be kept below 125°C, then the maximum ambient temperature can be
calculated as:
T j - (R θ JA x P LOSS ) = T A
125°C - (121°C/W x 149 mW) = 107°C
WSON Package
Figure 24. Internal WSON Connection
For certain high power applications, the PCB land may be modified to a "dog bone" shape (see Figure 25 ). By
increasing the size of ground plane, and adding thermal vias, the R θ JA for the application can be reduced.
Copyright ? 2011–2013, Texas Instruments Incorporated
Product Folder Links: LMR10510
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LMR10510YSDE/NOPB | 功能描述:直流/直流开关调节器 SIMPLE SWITCHER 5.5 Vin,1A SD 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 |
| LMR10510YSDX | 制造商:TI 制造商全称:Texas Instruments 功能描述:SIMPLE SWITCHER?? 5.5Vin, 1A Step-Down Voltage Regulator in SOT-23 and LLP |
| LMR10510YSDX/NOPB | 功能描述:直流/直流开关调节器 SIMPLE SWITCHER 5.5 Vin,1A SD 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 |
| LMR10515 | 制造商:TI 制造商全称:Texas Instruments 功能描述:SIMPLE SWITCHER? 5.5Vin, 1.5A Step-Down Voltage Regulator in SOT-23 and LLP |
| LMR10515XMF | 制造商:Texas Instruments 功能描述:BUCK, 1.5A, 5.5VIN 制造商:Texas Instruments 功能描述:BUCK, 1.5A, 5.5VIN; Primary Input Voltage:5.5V; No. of Outputs:1; Output Voltage:4.5V; Output Current:1.5A; Voltage Regulator Case Style:SOT-23; No. of Pins:5; Operating Temperature Min:-40C; Operating Temperature Max:125C; SVHC:No;RoHS Compliant: Yes |
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