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5. Output Diode Selection (D)

TL3577

100-kHz CURRENT-MODE SIMPLE STEP-UP/FLYBACK SWITCHING REGULATOR

SLVS633 – OCTOBER 2006

In the step-up regulator, the switching diode must withstand a reverse voltage and be able to conduct the peak

output current of the TL3577. Therefore, a suitable diode must have a minimum reverse breakdown voltage

greater than the circuit output voltage and should also be rated for average and peak current greater than

barrier diodes often are used in switching regulators. Refer to Table 4 for recommended part numbers and

voltage ratings of 1-A and 3-A diodes.

Schottky

Fast Recovery

(V)

1 A

3 A

1 A

3 A

1N5817

1N5820

20

MBR120P

MBR320P

1N5818

1N5821

30

MBR130P

MBR330P

11DQ03

31DQ03

1N5819

1N5822

40

MBR140P

MBR340P

11DQ04

31DQ04

MBR150

MBR350

1N4933

50

11DQ05

31DQ05

MUR105

1N4934

MR851

100

MUR110

30DL1

10DL1

MR831

(1)

MBRxxx and MURxxx are manufactured by Motorola.

1DDxxx, 11Cxx and 31Dxx are manufactured by International Rectifier

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