參數(shù)資料
型號(hào)： TPS54623RHLT
廠商： TEXAS INSTRUMENTS INC
元件分類： 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)： 5/35頁(yè)
文件大?。?/td> 1468K
代理商： TPS54623RHLT
EN
ip
ih
PVIN
TPS54623
R 1
R 2
EN
ip
ih
VIN
TPS54623
R 1
R 2
PVIN
1
-
÷
è
-
+
÷
è
ENFALLING
START
STOP
ENRISING
ENFALLING
p
h
ENRISING
V
R1 =
V
I
V
(
)
-
+
ENFALLING
STOP
ENFALLING
p
h
R1 V
R2 =
V
R1 I
I
(
)
0.997
2
-
W
×
-
Rrt(k
) = 48000 Fsw kHz
SLVSB09
– SEPTEMBER 2011
Figure 20. Adjustable PVIN Under Voltage Lock Out, VIN
≥ 4.5V
Figure 21. Adjustable VIN and PVIN Under Voltage Lock Out
(2)
(3)
Where Ih = 3.4 μA, Ip = 1.15 μA, VENRISING = 1.21 V, VENFALLING = 1.17 V
Adjustable Switching Frequency and Synchronization (RT/CLK)
The RT/CLK pin can be used to set the switching frequency of the device in two modes.
In RT mode, a resistor (RT resistor) is connected between the RT/CLK pin and GND. The switching frequency of
the device is adjustable from 200 kHz to 1600 kHz by placing a maximum of 240 k
Ω and minimum of 29 k
respectively. In CLK mode, an external clock is connected directly to the RT/CLK pin. The device is synchronized
to the external clock frequency with PLL.
The CLK mode overrides the RT mode. The device is able to detect the proper mode automatically and switch
from the RT mode to CLK mode.
Adjustable Switching Frequency (RT Mode)
To determine the RT resistance for a given switching frequency, use Equation 4 or the curve in Figure 22. To
reduce the solution size one would set the switching frequency as high as possible, but tradeoffs of the supply
efficiency and minimum controllable on time should be considered.
(4)
Copyright
2011, Texas Instruments Incorporated
13
Product Folder Link(s) :TPS54623
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