參數(shù)資料
型號(hào)： LM2698
文件頁(yè)數(shù)： 12/17頁(yè)
文件大小： 503K
代理商： LM2698
Operation
(Continued)
If the output capacitor is of high ESR (0.1
or higher), it may
be necessary to use C
. A rule of thumb is that if
1/(2
π
C
ESR) (Hz) is lower than f
S
/2 (Hz), C
C2
should be
used. Choose C
C2
such that:
(R
C
+ R
OUT
)(C
OUT
ESR) / (R
C
R
OUT
) (F)
where R
OUT
= output impedance of the error amp (875 k
).
Improving Transient Response Time
The above compensator design provides a loop gain with
high phase margin for a large stability margin. The transient
response time of this loop is limited by the lower
mid-frequency gain necessary to achieve a high phase mar-
gin. If it is desired to increase the transient response time,
C
may be decreased. Decreasing C
by 2x, 4x, and 6x
will yield increasingly shorter transient response times, how-
ever the loop phase margin will become progressively lower
as C
C1
is decreased. When optimizing the loop gain for
transient response time, it is recommended to keep the
phase margin above 40.
L
www.national.com
12
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LM2698MM-ADJ/NOPB 制造商:Texas Instruments 功能描述:DC/DC Converter (DC-DC) / Switching Regu
LM2698MMX-ADJ 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
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