參數(shù)資料
型號(hào)： TPS54622RHLT
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： 15 A SWITCHING REGULATOR, 1760 kHz SWITCHING FREQ-MAX, PQCC14
封裝： 3.50 X 3.50 MM, GREEN, PLASTIC, QFN-14
文件頁(yè)數(shù)： 7/36頁(yè)
文件大小： 1190K
代理商： TPS54622RHLT
SS/TR
TPS54622
EN
PWRGD
SS/TR
EN
PWRGD
TPS54622
D
Vout2 +
V
Vssoffset
R1 =
Vref
Iss
D
-
Vref
R1
R2 =
Vout2 +
V
Vref
V = Vout1
Vout 2
D
-
>
-
D
R1
2800
Vout1 180
V
SLVSA70
– MARCH 2011
Figure 23 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 23. 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 24 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. .
The deltaV variable is zero volt for simultaneous sequencing. To minimize the effect of the inherent SS/TR to
VSENSE offset (Vssoffset, 29mV) in the slow start circuit and the offset created by the pull-up current source
(Iss, 2.3
μA) and tracking resistors, the Vssoffset and Iss are included as variables in the equations.
To ensure proper operation of the device, the calculated R1 value from Equation 6 must be greater than the
value calculated in Equation 9.
(6)
(7)
(8)
(9)
Copyright
2011, Texas Instruments Incorporated
15
Product Folder Link(s) :TPS54622
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