Datasheet > MPQ4456

MPQ4456

更新时间： 2024-04-09 19:03:03

品牌	Logo	应用领域
芯源 - MPS		/
页数	文件大小	规格书
16页	410K
描述
1A, 4MHz, 36V 降压变换器

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MPQ4456 数据手册

MPQ4456 –INDUSTRIAL GRADE, 1A, 4MHz, 36V STEP-DOWN CONVERTER

APPLICATION INFORMATION

Setting the Frequency

small amount of current, keep R2 under 40kꢀ.

A typical value for R2 can be 40.2kꢀ. With this

value, R1 can be determined by:

The MPQ4456 has an externally adjustable

frequency. The switching frequency (f_S) can be

set using a resistor at FREQ pin (R_FREQ). The

recommended R_FREQvalue for various f_S,please

see Table1.

R1 50.25  (V_OUT 0.8)(k)

For example, for a 3.3V output voltage, R2 is

40.2kꢀ, and R1 is 127kꢀ.

Table 1— f_Svs. R_FREQ

Inductor

R_FREQ(kΩ)

f_S(MHz)

The inductor is required to supply constant

current to the output load while being driven by

the switched input voltage. A larger value

inductor will result in less ripple current that will

result in lower output ripple voltage. However,

the larger value inductor will have a larger

physical size, higher series resistance, and/or

lower saturation current. A good rule for

determining the inductance to use is to allow

the peak-to-peak ripple current in the inductor

to be approximately 30% of the maximum

switch current limit. Also, make sure that the

peak inductor current is below the maximum

switch current limit. The inductance value can

be calculated by:

3.8

3.5

3.3

22.1

26.7

2.8

2.5

2.2

33.2

45.3

1.8

1.6

1.4

1.2

57.6

80.6

100

133

200

340

536









V_OUT



^OUT

L1

 1



f_S ΔI_L



0.8

0.5

0.3

0.2

Where V_INis the input voltage, f_Sis the

switching frequency, and ΔI_Lis the peak-to-

peak inductor ripple current. Choose an

inductor that will not saturate under the

maximum inductor peak current. The peak

inductor current can be calculated by:

Setting the Output Voltage

The output voltage is set using a resistive

voltage divider from the output voltage to FB pin.

The voltage divider divides the output voltage

down to the feedback voltage by the ratio:









V_OUT



^OUT

I_LP I_LOAD



 1



2  f_S L1



Where I_LOADis the load current. Table 1 lists a

number of suitable inductors from various

manufacturers. The choice of which style

inductor to use mainly depends on the price vs.

size requirements and any EMI requirement.

V_FB V

^OUTR1 R2

Where V_FBis the feedback voltage and V_OUTis

the output voltage.

Thus the output voltage is:

(R1 R2)

V_OUT V_FB

A few µA of current from the high-side BS

circuitry can be seen at the output when the

MPQ4456 is at no load. In order to absorb this

MPQ4456 Rev. 1.01

1/27/2014

www.MonolithicPower.com

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

1...6 7 8910 11 12...16

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