參數(shù)資料
型號(hào)： L5980
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(yè)數(shù)： 14/37頁(yè)
文件大小： 959K
代理商： L5980
Application informations
L5980
14/37
5
Application informations
5.1
Input capacitor selection
The capacitor connected to the input has to be capable to support the maximum input
operating voltage and the maximum RMS input current required by the device. The input
capacitor is subject to a pulsed current, the RMS value of which is dissipated over its ESR,
affecting the overall system efficiency.
So the input capacitor must have a RMS current rating higher than the maximum RMS input
current and an ESR value compliant with the expected efficiency.
The maximum RMS input current flowing through the capacitor can be calculated as:
Equation 3
Where Io is the maximum DC output current, D is the duty cycle,
η
is the efficiency. This
function has a maximum at D=0.5 and, considering
η=1
, it is equal to Io/2.
In a specific application the range of possible duty cycles has to be considered in order to
find out the maximum RMS input current. The maximum and minimum duty cycles can be
calculated as:
Equation 4
and
Equation 5
Where V
F
is the forward voltage on the freewheeling diode and V
SW
is voltage drop across
the internal PDMOS. I
n
Table 5.
some Multi Layer Ceramic capacitors suitable for this
device are reported
Table 5.
Input MLCC capacitors
Manufacture
Series
Cap value (
μ
F)
Rated voltage (V)
MURATA
GRM31
10
25
GRM55
10
25
TDK
C3225
10
25
I
RMS
I
O
D
2
--------------
–
2
------
+
=
D
MAX
V
V
INMIN
V
SW
–
---------------------+
=
D
MIN
V
V
INMAX
V
SW
–
--------------------+
=
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L5980_08 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:0.7 A step-down switching regulator
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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
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