參數(shù)資料
型號： TPS54521RHLT
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, PQCC14
封裝： GREEN, PLASTIC, QFN-14
文件頁數(shù)： 8/40頁
文件大?。?/td> 1194K
代理商： TPS54521RHLT
SS/TR
EN
PWRGD
SS/TR
EN
PWRGD
TPS54521
PWRGD = 2 V / div
EN = 2 V / div
Vout1 = 1 V / div
Vout2 = 1 v / div
Time = 2 msec / div
EN = 2 V / div
Vout1 = 1 V / div
Vout2 = 1 V / div
SS/TR
TPS54521
EN
PWRGD
SS/TR
EN
PWRGD
TPS54521
SLVS981A – JUNE 2010 – REVISED AUGUST 2010
www.ti.com
The sequential method is illustrated in Figure 22 using two TPS54521 devices. The power good of the first
device is coupled to the EN pin of the second device which enables the second power supply once the primary
supply reaches regulation. Figure 23 shows the results of Figure 22.
Figure 22. Sequential Start Up Sequence
Figure 23. Sequential Start Up using EN and
PWRGD
Figure 24 shows the method implementing ratio-metric sequencing by connecting the SS/TR pins of two devices
together. The regulator outputs ramp up and reach regulation at the same time. When calculating the slow start
time the pull-up current source must be doubled in Equation 5. Figure 25 shows the results of Figure 24.
Figure 25. Ratio-metric Startup using Coupled
SS/TR Pins
Figure 24. Ratiometric 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 26 to the output of the power supply that needs to be tracked or another voltage
reference source. Using Equation 6 and Equation 7, the tracking resistors can be calculated to initiate the Vout2
slightly before, after or at the same time as Vout1. Equation 8 is the voltage difference between Vout1 and
Vout2.
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 6 and Equation 7 for deltaV. Equation 8 results in a
positive number for applications where the Vout2 is slightly lower than Vout1 when Vout2 regulation is achieved.
Figure 27 and Figure 28 show the results for positive deltaV and negative deltaV respectively.
16
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s) :TPS54521
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