參數(shù)資料
型號(hào)： LM2641-ADJMDC
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, UUC
封裝： DIE
文件頁(yè)數(shù)： 10/22頁(yè)
文件大?。?/td> 531K
代理商： LM2641-ADJMDC
Design Procedure (Continued)
Output Diodes
It is recommended that diodes be placed between the regu-
lated outputs and ground to prevent the outputs from swing-
ing below ground. The diode used may be a Schottky or
silicon type, and should have a current rating of 1A or more.
If the outputs are allowed to swing below ground more than
a Vbe, the substrate of the LM2641 will become forward
biased which will cause the part to operate incorrectly. An-
other potential problem which could be caused by negative
output transients is damage to the output capacitors, since
tantalum capacitors can be damaged if a reverse voltage is
forced across them
The operating conditions where this can occur are not typi-
cal: it can happen if one or both of the outputs are very lightly
loaded, and an undervoltage (or overvoltage) condition is
detected. When this happens, the LM2641 turns off the
switching oscillator and turns on both of the low-side FET’s
which abruptly grounds one end of the inductor. When this
happens, the other end of the inductor (which is connected
to the regulated output) will experience a transient ringing
voltage as the energy stored in the inductor is discharged.
The amplitude and duration of the ringing is a function of the
R-L-C tank circuit made up the output capacitance, inductor,
and resistance of the inductor windings.
Because of this, the choice of inductor influences how large
in amplitude the ringing will be. In tests performed on the
Typical Application Circuit, the Sumida inductor showed less
ringing than the Pulse inductor, but both showed a voltage
transient that would go slightly below ground. For this rea-
son, the output diodes are recommended.
LM2641
www.national.com
18
相關(guān)PDF資料
PDF描述
LM2645MTD/NOPB SWITCHING CONTROLLER, 335 kHz SWITCHING FREQ-MAX, PDSO48
LM2651MTCX-2.5/NOPB 2.6 A SWITCHING REGULATOR, 345 kHz SWITCHING FREQ-MAX, PDSO16
LM2651MTC-2.5/NOPB 2.6 A SWITCHING REGULATOR, 345 kHz SWITCHING FREQ-MAX, PDSO16
LM2651MTC-1.8/NOPB 2.6 A SWITCHING REGULATOR, 345 kHz SWITCHING FREQ-MAX, PDSO16
LM2670-5.0MDC 5.4 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, UUC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2641MTC-ADJ 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
LM2641MTC-ADJ/NOPB 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
LM2641MTCX-ADJ 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
LM2641MTCX-ADJ/NOPB 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
LM2642 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*