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TPS84210RKGR Datasheet(Folha de dados) 20 Page - Texas Instruments

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Nome de Peças. TPS84210RKGR
descrição  2.95-V to 6-V Input, 2-A Synchronous Buck, Integrated Power Solution
Download  29 Pages
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Fbricantes  TI1 [Texas Instruments]
Página de início  http://www.ti.com
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 20 page
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SS/TR
INH/UVLO
PWRGD
STSEL
SS/TR
INH/UVLO
PWRGD
STSEL
UDG-11120
(
) ( )
´
=
W
OUT2
V
12.6
R1
k
0.803
(
)
( )
´
=
W
-
OUT2
0.803
R1
R2
k
V
0.803
SS/TR
INH/UVLO
VOUT
STSEL
SS/TR
INH/UVLO
VOUT
STSEL
VOUT1
R1
R2
VOUT2
TPS84210
SLUSAN7A – SEPTEMBER 2011 – REVISED MARCH 2012
www.ti.com
Sequencing (SS/TR)
Many of the common power supply sequencing methods can be implemented using the SS/TR, INH and
PWRGD pins. The sequential method is illustrated in Figure 29 using two TPS84210 devices. The PWRGD pin
of the first device is coupled to the INH pin of the second device which enables the second power supply once
the primary supply reaches regulation. Do not place a pull-up resistor on PWRGD in this configuration. Figure 30
shows sequential turn-on waveforms of two TPS84210 devices.
Figure 29. Sequencing Schematic
Figure 30. Sequencing Waveforms
Simultaneous power supply sequencing can be implemented by connecting the resistor network of R1 and R2
shown in Figure 31 to the output of the power supply that needs to be tracked or to another voltage reference
source. Figure 32 shows simultaneous turn-on waveforms of two TPS84210 devices. Use Equation 3 and
Equation 4 to calculate the values of R1 and R2.
(3)
(4)
Figure 31. Simultaneous Tracking Schematic
Figure 32. Simultaneous Tracking Waveforms
20
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Copyright © 2011–2012, Texas Instruments Incorporated
Product Folder Link(s): TPS84210




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