參數(shù)資料
型號： L6918A
廠商： 意法半導體
英文描述： 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
中文描述： 5位可編程多相控制器
文件頁數(shù)： 20/35頁
文件大小： 760K
代理商： L6918A
L6918 L6918A
20/35
A minimum capacitor value is required to sustain the current during the load transient without discharge it. The
voltage drop due to the output capacitor discharge is given by the following equation:
Where D
MAX
is the maximum duty cycle value. The lower is the ESR, the lower is the output drop during load
transient and the lower is the output voltage static ripple.
INDUCTOR DESIGN
The inductance value is defined by a compromise between the transient response time, the efficiency, the cost
and the size. The inductor has to be calculated to sustain the output and the input voltage variation to maintain
the ripple current
I
L
between 20% and 30% of the maximum output current. The inductance value can be cal-
culated with this relationship:
V
V
–
SW
L
Where f
SW
is the switching frequency, V
IN
is the input voltage and V
OUT
is the output voltage.
Increasing the value of the inductance reduces the ripple current but, at the same time, reduces the converter
response time to a load transient. The response time is the time required by the inductor to change its current
from initial to final value. Since the inductor has not finished its charging time, the output current is supplied by
the output capacitors. Minimizing the response time can minimize the output capacitance required.
The response time to a load transient is different for the application or the removal of the load: if during the ap-
plication of the load the inductor is charged by a voltage equal to the difference between the input and the output
voltage, during the removal it is discharged only by the output voltage. The following expressions give approx-
imate response time for DI load transient in case of enough fast compensation network response:
The worst condition depends on the input voltage available and the output voltage selected. Anyway the worst
case is the response time after removal of the load with the minimum output voltage programmed and the max-
imum input voltage available.
Figure 11. Inductor ripple current vs. Vout
V
OUT
i
INmin
MAX
2
L
OUT
OUT
–
)
------------------------------------------------------------------------------------------
=
L
-----------------------------
V
IN
--------------
=
t
application
IN
V
OUT
----------–
=
t
removal
I
OUT
--------------
=
Figure 12 – Inductor ripple current vs. Vout
0
1
2
3
4
5
6
7
8
9
0.5
1.5
2.5
3.5
Output Voltage [V]
I
L=3
H,
Vin=12V
L=2
μ
H,
Vin=12V
L=1.5
μ
H, Vin=12V
L=2
μ
H,
Vin=5V
L=1.5
μ
H,
Vin=5V
L=3
μ
H, Vin=5V
相關PDF資料
PDF描述
L6918AD 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
L6918ADTR 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
L6918D 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
L6918DTR 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
L6919C 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT
相關代理商/技術參數(shù)
參數(shù)描述
L6918AD 功能描述:DC/DC 開關控制器 Prog Multi-Phase Cnt RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
L6918ADTR 功能描述:DC/DC 開關控制器 Prog Multi-Phase Cnt RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
L6918D 功能描述:DC/DC 開關控制器 Prog Multi-Phase Cnt RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
L6918DTR 功能描述:DC/DC 開關控制器 Prog Multi-Phase Cnt RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
L6919 制造商:未知廠家 制造商全稱:未知廠家 功能描述:5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*