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SP7653ER-L

更新时间： 2024-01-07 14:50:51

品牌	Logo	应用领域
西伯斯 - SIPEX		稳压器开关式稳压器或控制器电源电路开关式控制器
页数	文件大小	规格书
12页	206K
描述
Wide Input Voltage Range, 1.3MHz,Buck Regulator

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技术参数
数据手册

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SP7653ER-L 技术参数

是否Rohs认证：	符合	生命周期：	Transferred
包装说明：	7 X 4 MM, ROHS COMPLIANT, DFN-26	Reach Compliance Code：	unknown
风险等级：	5.76	Is Samacsys：	N
其他特性：	IT IS ALSO OPERATES IN 3 TO 28 VOLT	模拟集成电路 - 其他类型：	SWITCHING REGULATOR
控制模式：	VOLTAGE-MODE	控制技术：	PULSE WIDTH MODULATION
最大输入电压：	5.5 V	最小输入电压：	4.5 V
标称输入电压：	5 V	JESD-30 代码：	R-XDSO-N26
JESD-609代码：	e3	长度：	7 mm
湿度敏感等级：	3	功能数量：	1
端子数量：	26	最高工作温度：	85 °C
最低工作温度：	-40 °C	最大输出电流：	5 A
封装主体材料：	UNSPECIFIED	封装代码：	HVSON
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度（摄氏度）：	260	认证状态：	Not Qualified
座面最大高度：	1 mm	表面贴装：	YES
切换器配置：	BUCK	最大切换频率：	1300 kHz
温度等级：	INDUSTRIAL	端子面层：	Matte Tin (Sn)
端子形式：	NO LEAD	端子节距：	0.5 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	40
宽度：	4 mm	Base Number Matches：	1

SP7653ER-L 数据手册

APPLICATIONS INFORMATION

Inductor Selection

I_PP

There are many factors to consider in selecting

the inductor including core material, inductance

vs. frequency, current handling capability, effi-

ciency, size and EMI. In a typical SP7653 cir-

cuit, the inductor is chosen primarily for value,

saturationcurrentandDCresistance. Increasing

the inductor value will decrease output voltage

ripple, but degrade transient response. Low in-

ductor values provide the smallest size, but

cause large ripple currents, poor efficiency and

moreoutputcapacitancetosmoothoutthelarger

ripple current. The inductor must be able to

handle the peak current at the switching fre-

quency without saturating, and the copper resis-

tance in the winding should be kept as low as

possible to minimize resistive power loss. A

good compromise between size, loss and cost is

to set the inductor ripple current to be within

20% to 40% of the maximum output current.

I_PEAK= I_{OUT (max)}

and provide low core loss at the high switching

frequency. Low cost powdered iron cores have

a gradual saturation characteristic but can intro-

duceconsiderableACcoreloss,especiallywhen

the inductor value is relatively low and the

ripplecurrentishigh.Ferritematerials,although

more expensive, have an abrupt saturation char-

acteristic with the inductance dropping sharply

when the peak design current is exceeded. Nev-

ertheless, they are preferred at high switching

frequencies because they present very low core

loss while the designer is only required to

prevent saturation. In general, ferrite or

molypermalloy materials are a better choice for

all but the most cost sensitive applications.

The switching frequency and the inductor oper-

ating point determine the inductor value as fol-

lows:

Optimizing Efficiency

The power dissipated in the inductor is equal to

the sum of the core and copper losses. To mini-

mizecopperlosses,thewindingresistanceneeds

to be minimized, but this usually comes at the

expense of a larger inductor. Core losses have a

more significant contribution at low output cur-

rent where the copper losses are at a minimum,

and can typically be neglected at higher output

currentswherethecopperlossesdominate.Core

loss information is usually available from the

magnetic vendor. Proper inductor selection can

affect the resulting power supply efficiency by

more than 15%!

V_OUT(V_{IN (max)}−V_OUT

)

L =

V_{IN (max)}F_SK_rI_{OUT (max)}

where:

f_S= switching frequency

K_r= ratio of the AC inductor ripple current to

the maximum output current

The peak to peak inductor ripple current is:

Thecopperlossintheinductorcanbecalculated

using the following equation:

V_OUT(V_{IN (max)}−V_OUT

)

P_L(Cu)= I_L²_(RMS)R_WINDING

I_PP

V_IN(max)F_SL

where I_L(RMS)is the RMS inductor current that

can be calculated as follows:

Once the required inductor value is selected, the

proper selection of core material is based on

peak inductor current and efficiency require-

ments. The core must be large enough not to

saturate at the peak inductor current

I_PP

I_OUT(max)

I_L(RMS)= I_OUT(max)1 +

(

)

Date: 03/25/05

SP7653 Wide Input Voltage Range, 1.3MHz, Buck Regulator

1...4 5 678 9 10...12

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