參數(shù)資料
型號(hào)： LM2633MTDX/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 275 kHz SWITCHING FREQ-MAX, PDSO48
封裝： TSSOP-48
文件頁數(shù)： 28/40頁
文件大?。?/td> 1350K
代理商： LM2633MTDX/NOPB
Control Loop Design (Continued)
(45)
(46)
Back to the previous example. Let B = K, f
z1 =fp,fp2 =fz,fz2
=f
n, then:
f
c_o = 5.1 x 310Hz = 1581Hz
The corresponding Bode plots of the compensation network
and the loop transfer function are shown in
Figure 13 respectively.
It can be seen from
Figure 13 that the crossover frequency is
20kHz, and the phase margin is about 84 degrees.
One thing that should be pointed out is this Bode plot is only
for the 0.4
load. That is, when load current is 4A. If load
current is lower than 4A, the portion of the gain plot from the
corresponding f
p to 310Hz will be 40dB/dec. If load current
is higher than 4A, then the portion of the gain plot from
310Hz to fp will be flat. However, this usually does not have
much effect on the cross-over frequency and phase margin
because it happens at low frequencies.
If a shorter recovery time is desired during a load transient,
f
z1 can be increased so that the gain of the loop transfer
function becomes higher. However, try not to let f
z1 be higher
than the desired cross-over frequency, otherwise phase mar-
gin can be too low.
Figure 14 shows a situation where f
z1 is
placed at a higher frequency than the f
p, which results in a
40 dB/dec section before the cross-over frequency. Notice
the phase margin is lower.
Sometimes the slow transient response is caused by the
current source and sink capability of the error amplifier.
Reducing the value of the compensation capacitor helps, but
make sure the small-signal loop is stable.
The power stage component selection can be significantly
different from the example values.
Figure 15 shows how the
two high frequency poles of a current-mode-control buck
regulator change with the Q value.
20000876
FIGURE 12. Example Compensation Transfer Function
20000877
FIGURE 13. Example Loop Transfer Function
200008D6
FIGURE 14. Higher Low Frequency Gain
LM2633
www.national.com
34
相關(guān)PDF資料
PDF描述
LM2635MX/NOPB SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO20
LM26480QSQX-CF/NOPB 2.4 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, QCC24
LM26480QSQ-CF/NOPB 2.4 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, QCC24
LM26480SQ-BF/NOPB 2.4 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, QCC24
LM26480SQX-BF/NOPB 2.4 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, QCC24
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2635 制造商:NSC 制造商全稱:National Semiconductor 功能描述:5-Bit Programmable Synchronous Buck Regulator Controller
LM2635A WAF 制造商:Texas Instruments 功能描述:
LM2635M 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述:
LM2635M/NOPB 功能描述:IC REG SYNCH BUCK 5-BIT 20-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件
LM2635MX 功能描述:IC REG SYNCH BUCK 5-BIT 20-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件
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

*
*
*