- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383234 > L5980TR (意法半導(dǎo)體) 0.7A step-down switching regulator PDF資料下載
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)： | 16/37頁 |
| 文件大?。?/td> | 959K |
| 代理商： | L5980TR |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁當(dāng)前第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁
Application informations
L5980
16/37
5.3
Output capacitor selection
The current in the capacitor has a triangular waveform 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.
Equation 9
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 5.4
, it will be illustrated how to consider its effect in the
system stability.
For example with V
OUT
=3.3V, V
IN
=12V,
I
L
=0.21A (resulting by the inductor value), in order
to have a
V
OUT
=0.01·V
OUT
, if the multi layer capacitor are adopted, 10uF 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 100uF with ESR=40m
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
rate load transient is required by the application the output capacitor and system bandwidth
have to be chosen in order to sustain the load transient .
In the table below some capacitor series are listed.
Coiltronics
DRQ73
10 to 22
1.67 to 2.47
LD2
27 to 47
1.64 to 2.1
SUMIDA
CDR6D28MN
10 to 22
1.65 to 2.5
CDRH105RNP
27 to 56
1.9 to 2.7
Table 6.
Inductors (continued)
Manufacturer
Series
Inductor value (
μ
H)
Saturation current (A)
Table 7.
Output capacitors
Manufacturer
Series
Cap value (
μ
F)
Rated voltage (V)
ESR (m
)
MURATA
GRM32
22 to 100
6.3 to 25
< 5
GRM31
10 to 47
6.3 to 25
< 5
V
OUT
ESR
I
MAX
I
8 C
OUT
f
SW
------------------------------------
+
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L5985 | 2A step-down switching regulator |
| L5985TR | 2A step-down switching regulator |
| L5991 | PRIMARY CONTROLLER WITH STANDBY |
| L5991A | PRIMARY CONTROLLER WITH STANDBY |
| L5991AD | PRIMARY CONTROLLER WITH STANDBY |
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(fēng)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(fēng)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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。