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TPS62933O Datasheet(PDF) 19 Page - Texas Instruments

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Part # TPS62933O
Description  TPS62933 3.8-V to 30-V, 3-A Synchronous Buck Converter in SOT583 Package
PDF  47 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS62933O Datasheet(HTML) 19 Page - Texas Instruments

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Vin (V)
12
14
16
18
20
22
24
26
28
30
500
600
700
800
900
1000
1100
1200
1300
Iout=3A
Iout=1.5A
Figure 8-5. Frequency Foldback at TON_MIN, VOUT =
1.8 V, fSW = 1200 kHz
Vin (V)
4
5
6
7
8
9
10
11
12
0
250
500
750
1000
1250
1500
Iout=1.5A
Iout=3A
Figure 8-6. Frequency Foldback at TOFF_MIN, VOUT =
5 V, fSW = 1200 kHz
8.3.9 Frequency Spread Spectrum
In order to reduce EMI, the TPS62933 introduces frequency spread spectrum. The jittering span is typically
Δfc = ±6% of the switching frequency with the modulation frequency of fm = fSW/128. The purpose of spread
spectrum is to eliminate peak emissions at specific frequencies by spreading emissions across a wider range
of frequencies than a part with fixed frequency operation. Figure 8-7 shows the frequency spread spectrum
modulation. Figure 8-8 shows the energy is spread out at the center frequency fc.
Modulation Frequency fm = fsw/128
fmin = fc * (1 - 6%)
Center Frequency fc
fmax = fc * (1 + 6%)
Figure 8-7. Frequency Spread Spectrum Diagram
www.ti.com
TPS62933
SLUSEA4A – JUNE 2021 – REVISED DECEMBER 2021
Copyright © 2021 Texas Instruments Incorporated
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