MC34063AB - MC34063AC - MC34063EB - MC34063EC

Typical application circuit

13/23

Note:

The following power supply characteristics must be chosen:

value will and 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.

Table 12.

Calculation

Parameter

Step-Up

(Discontinuous mode)

Step-Down

(Continuous mode)

Voltage Inverting

(Discontinuous mode)

OUT

V

F

V

IN mi

(

–

+

V

IN min

–

------------------------------------------------

V

OUT

V

F

+

Nmin

–

V

OU

–

---------------------------------------------------

V

OUT

V

F

+

V

IN

V

sat

–

-------------------------------

I

V

ripple p

p

–

()

-------------------------------

I

PK switch

t

off

+

()

8V

ripple p

p

–

()

------------------------------------------------------

I

V

ripple p

p

–

()

-------------------------------

V

IN min

–

I

PK switch

()

-----------------------------------

t

on mi

(

×

N min

–

V

out

–

I

PK switch

()

-------------------------------------------------

t

on

(

×

V

IN min

–

I

PK switch

()

-----------------------------------

t

on mi

(

×