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| 型号： | L5988D |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 5.6 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | LEAD FREE, HTSSOP-16 |
| 文件页数： | 18/52页 |
| 文件大小： | 1858K |
| 代理商： | L5988D |
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L5988D
Application information
Doc ID 15324 Rev 3
25/52
6
Application information
6.1
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:
Where Io is the maximum DC output current, D is the duty cycles,
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:
and
Where
ΔV
HIGH_SIDE and ΔVLOW_SIDE are the voltage drops across the embedded switches.
The peak to peak voltage across the input filter can be calculated as:
Given a physical dimension, ceramic capacitors can met well the requirements of the input
filter substaining an higher input current than electrolytic / tantalum types. In this case the
equation of CIN as a function of the target VPP can be written as follows:
I
RMS
I
O
D
2D
2
η
---------------
–
D
2
η
2
-------
+
=
D
MAX
V
OUT
ΔV
LOW_SIDE
+
V
INMIN
ΔV
LOW_SIDE
ΔV
HIGH_SIDE
–
+
--------------------------------------------------------------------------------------------------
=
D
MIN
V
OUT
ΔV
LOW_SIDE
+
V
INMAX
ΔV
LOW_SIDE
ΔV
HIGH_SIDE
–
+
----------------------------------------------------------------------------------------------------
=
V
PP
I
O
C
IN
f
SW
-----------------------
1
D
η
----
–
D
D
η
----
1D
–
()
+
ESR I
O
+
=
C
IN
I
O
V
PP
f
SW
-------------------------
1
D
η
----
–
D
D
η
----
1D
–
()
+
=
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L5988DTR | 功能描述:直流/直流开关调节器 4A Step Down Reg 2.9V to 18V 200ns RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| L5989D | 功能描述:直流/直流开关调节器 4A cont 5A pulsed step-down sw RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| L5989DTR | 功能描述:直流/直流开关调节器 4A cont 5A pulsed step-down sw RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| L5991 | 功能描述:电流型 PWM 控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| L5991_01 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:PRIMARY CONTROLLER WITH STANDBY |
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