V

V

V

V

V

V

1

f

1

f

1

f

ton

t

off

) 1

ton

t

off

) 1

ton

t

off

) 1

4

4

4

2I

out(max)

2I

out(max)

t

off

) 1

2I

out(max)

t

off

) 1

0.3

I

pk(switch)

0.3

I

pk(switch)

0.3

I

pk(switch)

V

I

pk(switch)

t

on(max)

V

I

pk(switch)

t

on(max)

V

I

pk(switch)

t

on(max)

9

I

V

ripple(pp)

9

I

V

ripple(pp)

I

8V

ripple(pp)

1.25(1 )

R2

R1

)

1.25(1 )

R2

R1

)

*1.25(1 )

R2

R1

)

MC33063A

MC34063A

SLLS636L – DECEMBER 2004 – REVISED DECEMBER 2009

www.ti.com

APPLICATION INFORMATION

CALCULATION

STEP UP

STEP DOWN

VOLTAGE INVERTING

See Figure 6

See Figure 8

See Figure 10

The following power-supply parameters are set by the user:

regulation and, thus, must be considered. In practice, the actual capacitor value should be larger than the

calculated value, to account for the capacitor's equivalent series resistance and board layout.

10

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