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參數(shù)資料
| 型號(hào)： | LM2716MTX-ADJ |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Dual (Step-up and Step-down) PWM DC/DC Converter |
| 中文描述： | DUAL SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | TSSOP-24 |
| 文件頁數(shù)： | 10/17頁 |
| 文件大?。?/td> | 563K |
| 代理商： | LM2716MTX-ADJ |
Buck Operation
(Continued)
COMPENSATION COMPONENTS
In the control to output transfer function, the first pole F
P1
can be estimated as 1/(2
π
R
OUT
C
OUT
); The ESR zero F
Z1
of
the output capacitor is 1/(2
π
ESRC
OUT
); Also, there is a high
frequency pole F
P2
in the range of 45kHz to 150kHz:
F
P2
= F
SW
/(
π
n(1D))
where D = V
OUT
/V
IN
, n = 1+0.348L/(V
IN
V
OUT
) (L is in μHs
and V
IN
and V
OUT
in volts).
The total loop gain G is approximately 500/I
OUT
where I
OUT
is in amperes.
A Gm amplifier is used inside the LM2716. The output resis-
tor R
of the Gm amplifier is about 85k
. C
and R
together with R
o
give a lag compensation to roll off the gain:
F
PC1
= 1/(2
π
C
C1
(R
o
+R
C1
)), F
ZC1
= 1/2
π
C
C1
R
C1
.
In some applications, the ESR zero F
can not be cancelled
by F
. Then, C
is needed to introduce F
PC2
to cancel the
ESR zero, F
P2
= 1/(2
π
C
C3
R
o
\
R
C1
).
The rule of thumb is to have more than 45 phase margin at
the crossover frequency (G=1).
SCHOTTKY DIODE
The breakdown voltage rating of D
1
is preferred to be 25%
higher than the maximum input voltage. Since D1 is only on
for a short period of time, the average current rating for D1
only requires being higher than 30% of the maximum output
current.
L
www.national.com
10
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PDF描述 |
|---|---|
| LM2716MT-ADJ | Dual (Step-up and Step-down) PWM DC/DC Converter |
| LM2716 | Dual (Step-up and Step-down) PWM DC/DC Converter |
| LM2717 | Dual Step-down DC/DC Converter |
| LM2717MT | Dual Step-down DC/DC Converter |
| LM2717MTX | Dual Step-down DC/DC Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2717 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual Step-down DC/DC Converter |
| LM2717_08 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual Step-Down DC/DC Converter |
| LM2717-ADJ | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual Step-Down DC/DC Converter |
| LM2717-ADJ_08 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual Step-Down DC/DC Converter |
| LM2717MT | 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 |
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