- 您现在的位置：买卖IC网 > PDF目录240267 > LM22672QMRX-ADJ (NATIONAL SEMICONDUCTOR CORP) 1.8 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 PDF资料下载
参数资料
| 型号： | LM22672QMRX-ADJ |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.8 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | PLASTIC, PSOP-8 |
| 文件页数： | 5/18页 |
| 文件大小： | 430K |
| 代理商： | LM22672QMRX-ADJ |
LM22672 is to measure the total conversion losses (Pin –
Pout) then subtract the power losses in the Schottky diode
and output inductor. An approximation for the Schottky diode
loss is:
P = (1 - D) x I
OUT x VD
An approximation for the output inductor power is:
P = I
OUT
2
x R x 1.1,
where R is the DC resistance of the inductor and the 1.1 factor
is an approximation for the AC losses. The regulator has an
exposed thermal pad to aid power dissipation. Adding several
vias under the device to the ground plane will greatly reduce
the regulator junction temperature. Selecting a diode with an
exposed pad will aid the power dissipation of the diode. The
most significant variables that affect the power dissipated by
the LM22672 are the output current, input voltage and oper-
ating frequency. The power dissipated while operating near
the maximum output current and maximum input voltage can
be appreciable. The junction-to-ambient thermal resistance of
the LM22672 will vary with the application. The most signifi-
cant variables are the area of copper in the PC board, the
number of vias under the IC exposed pad and the amount of
forced air cooling provided. The integrity of the solder con-
nection from the IC exposed pad to the PC board is critical.
Excessive voids will greatly diminish the thermal dissipation
capacity. The junction-to-ambient thermal resistance of the
LM22672 PSOP-8 package is specified in the electrical char-
acteristics table under the applicable conditions.
13
www.national.com
LM22672/LM22672Q
相关PDF资料 |
PDF描述 |
|---|---|
| LK1601-7ERD5TB1 | 1-OUTPUT 150 W AC-DC REG PWR SUPPLY MODULE |
| LK1601-7ERDDTB1 | 1-OUTPUT 150 W AC-DC REG PWR SUPPLY MODULE |
| LT1508CSW#TR | POWER FACTOR CONTROLLER WITH POST REGULATOR, 115 kHz SWITCHING FREQ-MAX, PDSO20 |
| LS1001-7ERD1B1 | 1-OUTPUT AC-DC REG PWR SUPPLY MODULE |
| LS1001-9PD8T | 1-OUTPUT AC-DC REG PWR SUPPLY MODULE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM22672QMRX-ADJ/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 |
| LM22673 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:3A SIMPLE SWITCHER, Step-Down Voltage Regulator with Adjustable Soft-Start and Current Limit |
| LM22673EVAL | 制造商:Texas Instruments 功能描述:Step-Down Switching Regulator Eval. Boar |
| LM22673EVAL/NOPB | 功能描述:电源管理IC开发工具 LM22673 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 |
| LM22673MR-5.0 | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Inv/Step Down 4.5V to 42V 8-Pin PSOP EP Rail |
发布紧急采购，3分钟左右您将得到回复。