參數(shù)資料
型號(hào)： TPS54160DRCT
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
封裝： PLASTIC, SON-10
文件頁數(shù)： 10/50頁
文件大?。?/td> 1375K
代理商： TPS54160DRCT
SS/TR
TPS54160
EN
PWRGD
SS / TR
EN
PWRGD
VOUT 1
VOUT 2
R 1
R 2
R3
R 4
TPS54160
(
)
+ D
=
+
SS offset
OUT2
REF
SS
V
R1
V
I
=
+ D
-
REF
OUT2
REF
V
R1
R2
V
D
=
-
OUT1
OUT2
V
SLVS795C – OCTOBER 2008 – REVISED OCTOBER 2010
www.ti.com
DETAILED DESCRIPTION (continued)
Figure 36. Schematic for Ratiometric and Simultaneous Start-Up Sequence
Ratio-metric and simultaneous power supply sequencing can be implemented by connecting the resistor network
of R1 and R2 shown in Figure 36 to the output of the power supply that needs to be tracked or another voltage
reference source. Using Equation 7 and Equation 8, the tracking resistors can be calculated to initiate the VOUT2
slightly before, after or at the same time as VOUT1. Equation 9 is the voltage difference between VOUT1 and VOUT2
at the 95% of nominal output regulation.
The
ΔV variable is zero volts for simultaneous sequencing. To minimize the effect of the inherent SS/TR to
VSENSE offset (VSS(offset)) in the slow start circuit and the offset created by the pull-up current source (ISS) and
tracking resistors, the VSS(offset) and ISS are included as variables in the equations.
To design a ratio-metric start up in which the VOUT2 voltage is slightly greater than the VOUT1 voltage when VOUT2
reaches regulation, use a negative number in Equation 7 through Equation 9 for
ΔV. Equation 9 results in a
positive number for applications which the VOUT2 is slightly lower than VOUT1 when VOUT2 regulation is achieved.
Since the SS/TR pin must be pulled below 40 mV before starting after an EN, UVLO or thermal shutdown fault,
careful selection of the tracking resistors is needed to ensure the device restarts after a fault. Make sure the
calculated R1 value from Equation 7 is greater than the value calculated in Equation 10 to ensure the device can
recover from a fault.
As the SS/TR voltage becomes more than 85% of the nominal reference voltage the VSS(offset) becomes larger as
the slow start circuits gradually handoff the regulation reference to the internal voltage reference. The SS/TR pin
voltage needs to be greater than 1.3 V for a complete handoff to the internal voltage reference as shown in
(7)
(8)
(9)
18
Copyright 2008–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS54160
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