MC33063AP1 datasheet(10/13 Pages) ONSEMI

부품명	MC33063AP1

상세설명	1.5 A, Step?뭊p/Down/ Inverting Switching Regulators

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10 / 13 page

MC34063A, MC33063A, NCV33063A

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10

Calculation

Step−Up

Step−Down

Voltage−Inverting

ton/toff

Vout ) VF * Vin(min)

V

in(min) *

Vsat

Vout ) VF

V

in(min) *

Vsat * Vout

|Vout| ) VF

V

in *

Vsat

(ton + toff)

1

f

1

f

1

f

toff

ton ) toff

ton

t

off

) 1

ton ) toff

ton

t

off

) 1

ton ) toff

ton

t

off

) 1

ton

(ton + toff) − toff

CT

4.0 x 10−5 ton

Ipk(switch)

2I

out(max)

ton

t

off

) 1

2I

out(max)

2I

out(max)

ton

t

off

) 1

Rsc

0.3/Ipk(switch)

L(min)

(V

in(min) *

Vsat)

I

pk(switch)

t

on(max)

(V

in(min) *

Vsat * Vout)

I

pk(switch)

t

on(max)

(V

in(min) *

Vsat)

I

pk(switch)

t

on(max)

CO

9

Ioutton

V

ripple(pp)

I

pk(switch)

(ton ) toff)

8V

ripple(pp)

9

Ioutton

V

ripple(pp)

Vsat = Saturation voltage of the output switch.

VF = Forward voltage drop of the output rectifier.

The following power supply characteristics must be chosen:

Vin − Nominal input voltage.

Vout − Desired output voltage,

Iout − Desired output current.

fmin − Minimum desired output switching frequency at the selected values of Vin and IO.

Vripple(pp) − Desired peak−to−peak output ripple voltage. In practice, the calculated capacitor value will need to be increased due to its

equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the

line and load regulation.

NOTE:

For further information refer to Application Note AN920A/D and AN954/D.

|Vout| + 1.25 1 )

R2

R1

Figure 15. Design Formula Table

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MC33063AP1 데이터시트(PDF) 10 Page - ON Semiconductor

MC33063AP1 데이터시트(HTML) 10 Page - ON Semiconductor

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