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SP7651ER-L

更新时间： 2024-02-20 19:09:54

品牌	Logo	应用领域
西伯斯 - SIPEX		稳压器
页数	文件大小	规格书
15页	1035K
描述
Wide Input Voltage Range 3Amp 900kHz Buck Regulator

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SP7651ER-L 技术参数

是否Rohs认证：	符合	生命周期：	Active
包装说明：	HVSON,	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.66	其他特性：	ALSO OPERATES WITH 3V TO 20V SUPPLY
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-PDSO-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：	PLASTIC/EPOXY
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：	990 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

SP7651ER-L 数据手册

APPLICATIONS INFORMATION

Ipp

Inductor Selection

Ipeak= iout(max) +

There are many factors to consider in se-

lectingtheinductor, including:corematerial,

inductance vs. frequency, current handling

capability, efﬁciency, size and EMI. In a typi-

cal SP765ꢀ circuit, the inductor is chosen

primarily by operating frequency, saturation

current and DC resistance. Increasing the

inductor value will decrease output voltage

ripple, but degrade transient response. Low

inductorvaluesprovidethesmallestsize,but

cause large ripple currents, poor efﬁciency

and require more output capacitance to

smooth out the larger ripple current. The

inductor must be able to handle the peak

current at the switching frequency without

saturating, and the copper resistance in the

winding should be kept as low as possible to

minimize resistive power loss. A good com-

promisebetweensize, lossandcostistoset

the inductor ripple current to be within 20%

to 40% of the maximum output current.

...andprovidelowcorelossatthehighswitch-

ingfrequency.Lowcostpowdered-ironcores

are inappropriate for 900kHz operation

Gappedferriteinductorsarewidelyavailable

for consideration. Select devices that have

operating data shown up to ꢀMHz. Ferrite

materials, on the other hand, are more

expensive and have an abrupt saturation

characteristic with the inductance dropping

sharply when the peak design current is

exceeded. Nevertheless, they are preferred

at high switching frequencies because they

present very low core loss and the design

only needs to prevent saturation. In general,

ferrite or molypermalloy materials will be

used with the SP765ꢀ.

Optimizing Efﬁciency

Thepowerdissipatedintheinductorisequal

to the sum of the core and copper losses. To

minimize copper losses, the winding resis-

tance needs to be minimized, but this usu-

ally comes at the expense of using a larger

inductor.Corelosseshaveamoresigniﬁcant

contribution at low output current where the

copper losses are at a minimum, and can

typically be neglected at higher output cur-

rents where the copper losses dominate.

Core loss information is usually available

from the magnetics vendor. Proper inductor

selection can affect the resulting power sup-

ply efﬁciency by more than 15-20%!

The switching frequency and the inductor

operatingpointdeterminetheinductorvalue

as follows:

Vout (Vin(max) - Vout)

Vin(max) fs Kr Iout(max)

where:

Fs = switching frequency

Kr = ratio of the AC inductor ripple current

to the maximum output current

The copper loss in the inductor can be cal-

culated using the following equation:

The peak-to-peak inductor ripple current

is:

PL(cu)=i²L(rms) rwinding

Vout(Vin(max) - Vout)

Ipp=

Vin(max) fs L

where I_L(RMS)is the RMS inductor current

that can be calculated as follows:

Once the required inductor value is se-

lected, the proper selection of core mate-

rial is based on peak inductor current and

efﬁciency requirements. The core must be

large enough not to saturate at the peak

inductor current...

Ipp

ꢀ

IL(rms)=iout(max) 1 + ( _Iout(max))

Rev J: 3/ꢀ4/07

SP765ꢀ Wide Input Voltage Range 3A, 900kHz, Buck Regulator

1...4 5 678 9 10...15

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