參數(shù)資料
型號： L5988D
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 5.6 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封裝： LEAD FREE, HTSSOP-16
文件頁數(shù)： 20/52頁
文件大小： 1858K
代理商： L5988D
L5988D
Application information
Doc ID 15324 Rev 3
27/52
In the table below some inductor part numbers are listed.
6.3
Output capacitor selection
The current in the capacitor has a triangular waveform (with zero average value) which
generates a voltage ripple across it. This ripple is due to the capacitive component and the
resistive component (ESR). So the output capacitor has to be selected in order to have a
voltage ripple compliant with the application requirements.
The amount of the voltage ripple can be calculated starting from the current ripple obtained
by the inductor selection.
Usually the resistive component of the ripple is much higher than the capacitive one, if the
output capacitor adopted is not a multi layer ceramic capacitor (MLCC) with very low ESR
value.
The output capacitor is important also for loop stability: it fixes the double LC filter pole and
the zero due to its ESR. In Chapter 6.4, it will be illustrated how to consider its effect in the
system stability.
For example with VOUT = 3.3 V, VIN = 12 V, ΔIL = 0.6 A (resulting by the inductor value), in
order to have a
ΔV
OUT = 0.01VOUT, if the multi layer capacitor are adopted, 10 F are
needed and the ESR effect on the output voltage ripple can be neglected. In case of not
negligible ESR (electrolytic or tantalum capacitors), the capacitor is chosen taking into
account its ESR value. So 100 F with ESR = 40 m
Ω is compliant with the requested output
voltage ripple
.
The output capacitor is also important to sustain the output voltage when a load transient
with high slew rate is required by the load. When the load transient slew rate exceeds the
system bandwidth the output capacitor provides the current to the load. So if the high slew
Table 11.
Inductors
Manufacturer
Series
Inductor value (
μH)
Saturation current (A)
Coilcraft
XPL7030
2.2 to 4.7
6.8 to 10.5
MSS1048
2.2 to 6.8
4.14 to 6.62
MSS1260
10
5.5
Wurth
WE-HC/HCA
3.3 to 4.7
7 to 11
WE-TPC type XLH
3.6 to 6.2
4.5 to 6.4
WE-PD type L
10
5.6
Coiltronics
DR74
3.3 to 4.7
4.3 to 5.4
DR125
10
5.3
BI
HM78-60
4.7 to 10
5.4 to 6.8
SUMIDA
HM78-60
4.7 to 10
5.4 to 6.8
ΔV
OUT
ESR
ΔI
MAX
ΔI
MAX
8C
OUT
f
SW
-------------------------------------
+
=
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L5988DTR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4A Step Down Reg 2.9V to 18V 200ns 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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
L5989D 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4A cont 5A pulsed step-down sw 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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
L5989DTR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4A cont 5A pulsed step-down sw 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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
L5991 功能描述:電流型 PWM 控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
L5991_01 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:PRIMARY CONTROLLER WITH STANDBY
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