Q

S

R

Q2

Q1

2

1

Oscillator

_

+

1.25-V

Reference

Regulator

4

5

3

8

7

6

0.33 W

3.8 kW

R2

L

220 mH

1N5819

470 mF

470 pF

R1

1.2 kW

100 mF

+

+

5 V/500 mA

1.0 mH

100 mF

+

Optional Filter

25 V

Comparator

V

R2

R1

)

MC33063A, MC34063A

www.ti.com

SLLS636N – DECEMBER 2004 – REVISED JANUARY 2015

9.2.3 Step-Down Converter Application

Figure 11. Step-Down Converter

9.2.3.1 Design Requirements

The user must determine the following desired parameters:

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.

Copyright © 2004–2015, Texas Instruments Incorporated

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