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參數(shù)資料
| 型號(hào)： | L5953 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.2 A SWITCHING REGULATOR, 425 kHz SWITCHING FREQ-MAX, PDSO36 |
| 封裝： | LEAD FREE, SOP-36 |
| 文件頁數(shù)： | 20/31頁 |
| 文件大小： | 420K |
| 代理商： | L5953 |
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L5953
Application note
6.3.3
Output capacitor selection
The criteria for the selection of the capacitor C7 is based on the output voltage ripple
requirements. The ripple on the output voltage is due to a capacitive contribute, often
negligible, equal to
and a resistive contribute given by the ESR of the capacitor and which is equal to
ΔVC fixes the value for C7 while ΔVESR limits the ESR of the capacitor.Usually the capacitor
is chosen so that the total ripple on the output regulated voltage Vo is equal to 1% of the
value of Vo. If Vripple is the maximum allowed voltage ripple on Vo then it should result:
More often the minimum value of C7 is imposed by other considerations such as to get a
good dynamic behavior of the output voltage in case of large load variations.
6.4
Free-wheeling diode
The diode must withstand an average current Id equal to Id = Ilim (1- Dmin) where Ilim is the
current of intervention of the short circuit protection and Dmin is the minimum duty cycle. As
Dmin is very low, the current Id can be assumed equal to Ilim.
6.5
Compensation network
In continuous mode, the voltage controlled buck converter shows two poles due to the
output LC filter and one zero due to the ESR of the output capacitor. The suggested
compensation network introduces two zeros and two poles:
–
the zeros compensate the double poles of the LC filter
–
one pole compensates the zero due to ESR of the output capacitor
the second pole is nominally located in the origin which means an infinite gain at frequency
null. In the reality the DC value of the closed loop gain can not be greater than the DC value
of the EA open loop gain and the pole is located at very low frequency.
The values for the components of the compensation network can be fixed when the inductor
L1 and the output capacitor C7 are chosen. The necessary steps are:
L
min
V
O
ΔI
Lmax
,
---------------------
1
V
O
V
imax
,
------------------
–
1
f
sw min
,
--------------------
=
ΔV
c
ΔI
Lmax
,
8C7f
sw min
,
----------------------------------------
=
ΔV
ESR
ΔI
Lmax
,
=
V
ripple
ΔV
c
2
ΔV
ESR
2
+
≥
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| L5953_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Multiple switching voltage regulator |
| L5954 | 功能描述:低壓差穩(wěn)壓器 - LDO Airbag App Specific Voltage Regulator RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| L5955 | 功能描述:多媒體雜項(xiàng) Multifunction Voltage Regulator RoHS:否 制造商:Texas Instruments 類型: 通道數(shù)量: 轉(zhuǎn)換速率:540 Mbps 分辨率: 封裝 / 箱體:SOIC-16 封裝:Tube |
| L5956 | 功能描述:多媒體雜項(xiàng) Multifunction Voltage Regulator RoHS:否 制造商:Texas Instruments 類型: 通道數(shù)量: 轉(zhuǎn)換速率:540 Mbps 分辨率: 封裝 / 箱體:SOIC-16 封裝:Tube |
| L5956_11 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Multifunction voltage regulator for car radio |
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