SD25-221-R

更新时间： 2024-11-12 06:10:39

品牌	Logo	应用领域
库柏 - COOPER		稳压器开关电感器固定电感器
页数	文件大小	规格书
4页	373K
描述
Switching Regulators

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中文翻译

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技术参数
数据手册

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SD25-221-R 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Transferred	Reach Compliance Code：	unknown
ECCN代码：	EAR99	HTS代码：	8504.50.80.00
风险等级：	5.12	Is Samacsys：	N
型芯材料：	FERRITE	直流电阻：	1.34 Ω
标称电感 (L)：	220 µH	电感器应用：	POWER INDUCTOR
电感器类型：	GENERAL PURPOSE INDUCTOR	功能数量：	1
端子数量：	2	最高工作温度：	85 °C
最低工作温度：	-40 °C	形状/尺寸说明：	RECTANGULAR PACKAGE
屏蔽：	YES	表面贴装：	YES
端子位置：	DUAL ENDED	端子形状：	ONE SURFACE
测试频率：	0.1 MHz	容差：	20%
Base Number Matches：	1

SD25-221-R 数据手册

Inductor Selection for Switching Regulators

Introduction/Basic Operation

In switching regulator applications the inductor is used as an energy

storage device. When the semiconductor switch is on the current in the

inductor ramps up and energy is stored. When the switch turns off energy

is released into the load. The amount of energy stored is calculated by the

formula Energy = ½L.I² (Joules), where:

•L is the inductance in Henrys

•I is the peak value of inductor current

The amount by which the current changes during a switching cycle is

known as the ripple current. Ripple current is defined as Vl = L.di/dt:

•V is the voltage across the inductor

•di is the ripple current

•dt is the duration for which the voltage is applied

I load

I inductor

V out

ESR

Figure 1:

Buck Inductor

Inductor current is made up of AC and DC components (Figure 1). The AC

component is high frequency and will flow through the output capacitor

because it has a low HF impedance. A ripple voltage is produced due to

the capacitor ‘equivalent series resistance’ (ESR) that will appear at the

output of the switching regulator. This ripple voltage needs to be

sufficiently low as not to effect the operation of the circuit the regulator is

supplying, normally in the order of 10-500mV

pk-pk

The following parameters need to be defined or calculated to select an

inductor:

•Maximum input voltage

Selecting the correct ripple current impacts the size of the inductor and

output capacitor. The capacitor needs to have a sufficiently high ripple

current rating or it will overheat and dry out. To achieve a good

compromise between inductor and capacitor size a ripple current value of

10-30% of maximum inductor current should be chosen. The current in

the inductor will be continuous for output currents greater that 5-15% of

full load.

•Output voltage

•Switching frequency

•Maximum ripple current

SD3814

•Duty cycle

12 3 4

中文翻译

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与SD25-221-R相关器件

型号	品牌	获取价格	描述	数据表
SD25-2655R9UUA1	KYOCERA AVX	获取价格
SD25-2R2	COOPER	获取价格	General Purpose Inductor, 2.2uH, 20%, 1 Element, Ferrite-Core, SMD, CHIP
SD25-2R2-R	COOPER	获取价格	Switching Regulators
SD2530L	WON-TOP	获取价格	Axial
SD25-330	COOPER	获取价格	General Purpose Inductor, 33uH, 20%, 1 Element, Ferrite-Core, SMD, 2020, CHIP
SD25-330-R	COOPER	获取价格	Switching Regulators
SD25-331	COOPER	获取价格	General Purpose Inductor, 330uH, 20%, 1 Element, Ferrite-Core, SMD, CHIP
SD25-331-R	COOPER	获取价格	Switching Regulators
SD2535L	WON-TOP	获取价格	Axial
SD253N	INFINEON	获取价格	FAST RECOVERY DIODES Stud Version

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