參數(shù)資料
型號(hào)： TPS5401DGQT
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, MSOP-10
文件頁(yè)數(shù)： 10/41頁(yè)
文件大小： 1149K
代理商： TPS5401DGQT
SS / TR
TPS5401
EN
PWRGD
SS / TR
EN
VSENSE
V
OUT1
V
OUT2
R 1
R 2
R3
R 4
TPS5401
PWRGD
OUT2
ssoffset
ref
ss
V
+
V
R1 =
×
V
I
D
ref
OUT2
ref
V
R1
R2 =
V
+
V
D -
SLVSAB0 – DECEMBER 2010
www.ti.com
DETAILED DESCRIPTION (continued)
Figure 34. Schematic for Ratiometric and Simultaneous Start-Up Sequence
Ratiometric and simultaneous power supply sequencing can be implemented by connecting the resistor network
of R1 and R2 shown in Figure 34 to the output of the power supply that must be tracked or to another voltage
reference source. Using Equation 5 and Equation 6, the tracking resistors can be calculated to initiate the VOUT2
slightly before, after, or at the same time as VOUT1. Equation 7 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 (Vssoffset) in the slow-start circuit and the offset created by the pullup current source (Iss) and
tracking resistors, the Vssoffset and Iss are included as variables in the equations. Figure 37 shows the result when
ΔV = 0 V.
To design a ratiometric start-up in which the VOUT2 voltage is slightly greater than the VOUT1 voltage when VOUT2
reaches regulation, use a negative number in Equation 5 through Equation 7 for
ΔV. Equation 7 results in a
positive number for applications in which VOUT2 is slightly lower than VOUT1 when VOUT2 regulation is achieved.
Figure 35 and Figure 36 show the start-up waveforms for negative and positive
ΔV, respectively.
Because 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 can restart after a fault. Make sure
the calculated R1 value from Equation 5 is greater than the value calculated in Equation 8 to ensure the device
can recover from a fault.
As the SS/TR voltage becomes more than 85% of the nominal reference voltage, the Vssoffset becomes larger as
the slow-start circuits gradually hand off the regulation reference to the internal voltage reference. The SS/TR pin
voltage must be greater than 1.3 V for a complete handoff to the internal voltage reference as shown in
(5)
(6)
18
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS5401
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