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参数资料
| 型号： | LM3102EVAL/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 14/24页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR 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 |
SNVS515G – SEPTEMBER 2007 – REVISED JANUARY 2012
Figure 25. Alternate Shutdown Implementation
THERMAL PROTECTION
The junction temperature of the LM3102 should not exceed the maximum limit. Thermal protection is
implemented by an internal Thermal Shutdown circuit, which activates (typically) at 165°C to make the controller
enter a low power reset state by disabling the main MOSFET, disabling the on-timer, and grounding the SS pin.
Thermal protection helps prevent catastrophic failures from accidental device overheating. When the junction
temperature falls back below 145°C (typical hysteresis = 20°C), the SS pin is released and normal operation
resumes.
THERMAL DERATING
The LM3102 is capable of supplying 2.5A below an ambient temperature of 100°C. Under worst case operation,
with either input voltage up to 42V, operating frequency up to 1 MHz, or voltage of the RON pin below the
absolute maximum of 7V, the LM3102 can deliver a minimum of 1.9A output current without thermal shutdown
with a PCB ground plane copper area of 40cm 2 , 2 oz/Cu. Figure 26 shows a thermal derating curve for the
minimum output current without thermal shutdown against ambient temperature up to 125°C. Obtaining 2.5A
output current is possible by increasing the PCB ground plane area, or reducing the input voltage or operating
frequency.
Figure 26. Thermal Derating Curve
APPLICATIONS INFORMATION
EXTERNAL COMPONENTS
The following guidelines can be used to select external components.
R FB1 and R FB2 : These resistors should be chosen from standard values in the range of 1.0 k ? to 10 k ? ,
satisfying the following ratio:
R FB1 /R FB2 = (V OUT /0.8V) - 1
(7)
For V OUT = 0.8V, the FB pin can be connected to the output directly with a pre-load resistor drawing more than
20 μA. It is because the converter operation needs a minimum inductor current ripple to maintain good regulation
when no load is connected.
14
Product Folder Links: LM3102
Copyright ? 2007–2012, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LM3102QMH/NOPB | 功能描述:直流/直流开关调节器 SIMPLE SWITCHER Sync 1MHz 2.5A SD Vtg 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 |
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