- 您現(xiàn)在的位置：買賣IC網 > PDF目錄385477 > LM2633MTD (NATIONAL SEMICONDUCTOR CORP) Advanced Two-Phase Synchronous Triple Regulator Controller for Notebook CPUs PDF資料下載
參數(shù)資料
| 型號： | LM2633MTD |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Advanced Two-Phase Synchronous Triple Regulator Controller for Notebook CPUs |
| 中文描述： | SWITCHING CONTROLLER, 275 kHz SWITCHING FREQ-MAX, PDSO48 |
| 封裝： | TSSOP-48 |
| 文件頁數(shù)： | 34/40頁 |
| 文件大?。?/td> | 1350K |
| 代理商： | LM2633MTD |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁當前第34頁第35頁第36頁第37頁第38頁第39頁第40頁
Control Loop Design
(Continued)
(45)
(46)
Back to the previous example. Let B = K, f
z1
= f
p
, f
p2
= f
z
, f
z2
= 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 12 and
Figure 13 respectively.
It can be seen from Figure 13that 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
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
be higher
than the desired cross-over frequency, otherwise phase mar-
gin can be too low. Figure 14 shows a situation where f
is
placed at a higher frequency than the f
, 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
L
www.national.com
34
相關PDF資料 |
PDF描述 |
|---|---|
| LM2647LQX | Dual Synchronous Buck Regulator Controller |
| LM2647MTC | Dual Synchronous Buck Regulator Controller |
| LM2665M6 | Switched Capacitor Voltage Converter |
| LM2665M6X | Switched Capacitor Voltage Converter |
| LM2707 | Inductive-Boost Series LED Driver with Programmable Oscillator Frequency |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM2633MTD/NOPB | 功能描述:IC REG CTRLR 2-PHS SYNC 48TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,000 系列:- 應用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應商設備封裝:42-WLP 包裝:帶卷 (TR) |
| LM2633MTDX/NOPB | 制造商:Texas Instruments 功能描述:5 BIT DAC TRIPLE OUTPUT CONTR |
| 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: |
發(fā)布緊急采購，3分鐘左右您將得到回復。