Datasheet > SP7655_07

SP7655_07

更新时间： 2024-02-13 21:50:21

品牌	Logo	应用领域
西伯斯 - SIPEX		稳压器
页数	文件大小	规格书
16页	1791K
描述
Wide Input Voltage Range, 8Amp 300kHz, Buck Regulator

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SP7655_07 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 SP7655 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

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 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 switch-

ing frequency. Low cost powdered-iron cores

have a gradual saturation characteristic but can

introduce considerable AC core loss, especially

whentheinductorvalueisrelativelylowandthe

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

magneticsvendor.Properinductorselectioncan

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_L(RMS)= I _OUT(max)1 +

I_OUT(max)

(

)

Rev E: 3/2ꢀ/07

SP7655 Wide Input Voltage Range 8A, 300kHz, Buck Regulator

1...4 5 678 9 10...16

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与SP7655_07相关器件

型号	品牌	获取价格	描述	数据表
SP7655EB	SIPEX	获取价格	Evaluation Board Manual
SP7655ER	SIPEX	获取价格	Wide Input Voltage Range, 8Amp 300kHz, Buck Regulator
SP7655ER/TR	SIPEX	获取价格	Wide Input Voltage Range 8A, 300kHz, Buck Regulator
SP7655ERL	SIPEX	获取价格	Wide Input Voltage Range, 8Amp 300kHz, Buck Regulator
SP7655ER-L	SIPEX	获取价格	暂无描述
SP7655ERL/TR	SIPEX	获取价格	Wide Input Voltage Range, 8Amp 300kHz, Buck Regulator
SP7655ER-L/TR	SIPEX	获取价格	Wide Input Voltage Range 8A, 300kHz, Buck Regulator
SP7656	EXAR	获取价格	3A, 29V Non-Synchronous Buck Converter
SP7656EB	ETC	获取价格	EVAL BOARD FOR SP7656
SP7656EN2-L	EXAR	获取价格	3A, 29V Non-Synchronous Buck Converter

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