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參數(shù)資料
| 型號： | L5980TR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 0.7A step-down switching regulator |
| 中文描述： | 0.7A的降壓開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 24/37頁 |
| 文件大?。?/td> | 959K |
| 代理商： | L5980TR |
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Application informations
L5980
24/37
The guidelines for positioning the poles and the zeroes and for calculating the component
values can be summarized as follow:
1.
Choose a value for R
1
, usually between 1k and 5k, in order to have values of C4 and
C5 not comparable with parasitic capacitance of the board.
2.
Choose a gain (R
4
/R
1
) in order to have the required bandwidth (BW), that means:
Equation 22
Where f
ESR
is the ESR zero:
Equation 23
and Vs is the saw-tooth amplitude. The voltage feed forward keeps the ratio Vs/Vin
constant.
3.
Calculate C
4
by placing the zero one decade below the output filter double pole:
Equation 24
4.
Then calculate C
3
in order to place the second pole at four times the system bandwidth
(BW):
Equation 25
For example with V
OUT
=1.2V, V
IN
=12V, I
O
=0.7A, L=22
μ
H, C
OUT
=220
μ
F, ESR=50m
,
the
type II compensation network is:
In
Figure 15
is shown the module and phase of the open loop gain. The bandwidth is about
35kHz and the phase margin is 49°.
R
4
f
f
LC
-----------
2
f
ESR
-----------
V
S
V
IN
--------
R
1
=
f
ESR
2
π
ESR C
OUT
-------------------------------------------
=
C
4
2
π
R
4
f
LC
------------------------------
=
C
5
C
2
π
R
4
C
4
4 BW
1
–
-------------------------------------------------------------
=
R
1
1.1k
=
R
2
249
=
R
4
12k
=
C
4
47nF
=
C
5
68pF
=
,
,
,
,
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L5980TR-CUT TAPE | 制造商:ST 功能描述:L5980 Series 15 V 250 kHz 0.7 A Step Down Switching Regulator - VFQFPN-8 |
| L5981 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1A STEP-DOWN SWITCH REG RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L5981_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1 A step-down switching regulator |
| L5981TR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1a Step-Down Switching Reg RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L5983 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.5A STEP-DOWN SWITCHING REGULATOR RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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