TL2575 datasheet(17/34 Pages) TI1

17 / 34 page

TL2575, TL2575HV

www.ti.com

SLVS638C – JANUARY 2006 – REVISED NOVEMBER 2014

PROCEDURE (Adjustable Output)

EXAMPLE (Adjustable Output)

B. COUT should have a voltage rating of at least 1.5 × VOUT. But if a

low output ripple voltage is desired, choose capacitors with a higher

voltage ratings than the minimum required due to their typically lower

ESRs.

4. Catch Diode Selection (D1) (see Table 1)

A. In normal operation, the catch diode requires a current rating of at A. Pick a diode with a 3-A rating.

least 1.2 × ILOAD(Max). For the most robust design, D1 should be

rated for a current equal to the TL2575 maximum switch peak

current; this represents the worst-case scenario of a continuous

short at VOUT.

B. The diode requires a reverse voltage rating of at least B. Pick a 40-V rated Schottky diode (1N5822, MBR340, 31QD04, or

1.25 × VIN(Max).

SR304) or 100-V rated Fast Recovery diode (31DF1, MURD310, or

HER302)

5. Input Capacitor (CIN)

An aluminum electrolytic or tantalum capacitor is needed for input CIN = 100 μF, 35 V, aluminum electrolytic

bypassing. Locate CIN as close to VIN and GND pins as possible.

Table 1. Diode Selection Guide

SCHOTTKY

FAST RECOVERY

1N5817

1N5820

20 V

MBR120P

MBR320

SR102

SR302

1N5818

1N5821

MBR130P

MBR330

30 V

11DQ03

31DQ03

SR103

SR303

The following diodes

1N5819

IN5822

are all rated to 100 V:

MBR140P

MBR340

11DF1

31DF1

40 V

11DQ04

31DQ04

MUR110

MURD310

SR104

SR304

HER102

HER302

MBR150

MBR350

50 V

11DQ05

31DQ05

SR105

SR305

MBR160

MBR360

60 V

11DQ06

31DQ06

SR106

SR306

10.1.2.9 Inductor Selection Guide

Inductor Value Selection Guide for Continuous-Mode Operation

Figure 14. TL2575-50

Figure 13. TL2575-33

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