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| TL3577 Datasheet, PDF (17/21 Pages) Texas Instruments – 100-kHz CURRENT-MODE SIMPLE STEP-UP/FLYBACK SWITCHING REGULATOR | |||
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www.ti.com
TL3577
100-kHz CURRENT-MODE SIMPLE STEP-UP/FLYBACK SWITCHING REGULATOR
SLVS633 â OCTOBER 2006
5. Output Diode Selection (D)
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
ILOAD(max) and ID(pk). Because of their low forward-voltage drop (and higher regulator efficiencies), Schottky
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.
Table 4. Diode Selection Chart(1)
VOUT(max)
(V)
20
30
40
50
100
1A
1N5817
MBR120P
1N5818
MBR130P
11DQ03
1N5819
MBR140P
11DQ04
MBR150
11DQ05
Schottky
3A
1N5820
MBR320P
1N5821
MBR330P
31DQ03
1N5822
MBR340P
31DQ04
MBR350
31DQ05
Fast Recovery
1A
3A
1N4933
MUR105
1N4934
MUR110
10DL1
MR851
30DL1
MR831
(1) MBRxxx and MURxxx are manufactured by Motorola.
1DDxxx, 11Cxx and 31Dxx are manufactured by International Rectifier
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