TL2575-05

7-V to 40-V

Unregulated

DC Input

100

µF

+

1

3

GND

5

ON/OFF

D1

1N5819

OUTPUT

2

L1

330

µH

330

µF

+

FEEDBACK

4

5-V

Regulated

Output

1-A Load

L2

20

µH

C1

100

µF

+

Optional Output Ripple Filter

TL2575, TL2575HV

www.ti.com

SLVS638C – JANUARY 2006 – REVISED NOVEMBER 2014

10 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

10.1 Typical Application

Pin numbers are for the KTT (TO-263) package.

Figure 12. Typical Application Circuit (Fixed Version)

10.1.1 Design Requirements

•

Input capacitor for stability

•

Output capacitor for loop stability and ripple filtering

•

Catch diode to filter noise

•

Output inductor depending on the mode of operation

10.1.2 Detailed Design Procedure

addition, since most electrolytic capacitors have decreasing capacitances and increasing ESR as temperature

drops, adding a ceramic or solid tantalum capacitor in parallel increases the stability in cold temperatures.

To extend the capacitor operating lifetime, the capacitor RMS ripple current rating should be calculated as shown

in Equation 1.

where

•

•

(1)

For both loop stability and filtering of ripple voltage, an output capacitor is required, again in close proximity to

the regulator. For best performance, low-ESR aluminum electrolytics are recommended, although standard

aluminum electrolytics may be adequate for some applications as shown in Equation 2.

(2)

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