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| 型号： | LM22673MRE-ADJ/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 9/27页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 8PSOP |
| 产品培训模块： | SIMPLE SWITCHER® Regulators LM315x & LM2267x SIMPLE SWITCHER® and WEBENCH |
| 特色产品： | LM2267x/LM22680 SIMPLE SWITCHER? Series |
| 标准包装： | 1 |
| 系列： | SIMPLE SWITCHER® |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 1.285V |
| 输入电压： | 4.5 V ~ 42 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-PSOP-EP |
| 产品目录页面： | 1307 (CN2011-ZH PDF) |
| 配用： | 551600236-001-ND - WEBENCH BUILD IT LM2267X 8-PSOP LM22673EVAL/NOPB-ND - BOARD EVALUATION FOR LM22673 |
| 其它名称： | LM22673MRE-ADJDKR |
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SNVS586N – SEPTEMBER 2008 – REVISED APRIL 2013
Where V sc is the value of output voltage during the overload and F sw is the normal switching frequency. If the
input voltage should exceed this value, while in foldback mode, the regulator and/or the diode may be
damaged. It is important to note that the voltages in these equations are measured at the inductor. Normal trace
and wiring resistance will cause the voltage at the inductor to be higher than that at a remote load. Therefore,
even if the load is shorted with zero volts across its terminals, the inductor will still see a finite voltage. It is this
value that should be used for V x and V sc in the calculations. In order to return from foldback mode, the load must
be reduced to a value much lower than that required to initiate foldback. This load "hysteresis" is a normal aspect
of any type of current limit foldback associated with voltage regulators.
The safe operating area, when in short circuit mode, is shown in Figure 13 . Operating points below and to the
right of the curve represent safe operation.
45
40
35
30
25
20
15
10
5
SAFE OPERATING ARE A
0.0
0.2 0.4 0.6 0.8 1.0
1.2
SHORT CIRCUIT VOLTAGE (v)
Figure 13. SOA
Current Limit Adjustment
A key feature of the LM22673 is the ability to adjust the peak switch current limit. This can be useful when the full
current capability of the regulator is not required for a given application. A smaller current limit may allow the use
of power components with lower current ratings, thus saving space and reducing cost. A single resistor between
the IADJ pin and ground controls the current limit in accordance with Figure 14 . The current limit mode is set
during start-up of the regulator. When V IN is applied, a weak pull-up is connected to the IADJ pin and, after
approximately 100 μs, the voltage on the pin is checked against a threshold of about 0.8V. With the IADJ pin
open, the voltage floats above this threshold, and the current limit is set to the default value of 4.2A (typ). With a
resistor present, an internal reference holds the pin voltage at 0.8V; the resulting current sets the current limit.
The accuracy of the adjusted current limit will be slightly worse than that of the default value; +35%/ -25% is to
Figure 14. Current Limit vs IADJ Resistor
Copyright ? 2008–2013, Texas Instruments Incorporated
Product Folder Links: LM22673
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM22673MRX-5.0 | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Inv/Step Down 4.5V to 42V 8-Pin HSOP EP T/R |
| LM22673MRX-5.0/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 |
| LM22673MRX-ADJ | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Inv/Step Down 4.5V to 42V 8-Pin PSOP EP T/R |
| LM22673MRX-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 |
| LM22673QMR-5.0/NOPB | 制造商:Texas Instruments 功能描述:IC REG BUCK 5V 3A 8SOPWRPAD 制造商:Texas Instruments 功能描述:42V, 3A SIMPLE SWITCHER Step-Down Volta |
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