參數(shù)資料
型號(hào)： TK651XX
廠商： TOKO Inc.
英文描述： STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR
中文描述： 升壓電壓電壓監(jiān)控轉(zhuǎn)爐
文件頁(yè)數(shù)： 19/20頁(yè)
文件大?。?/td> 138K
代理商： TK651XX
January 1999 TOKO, Inc.
Page 19
TK651xx
PULSED LOAD APPLICATION
Often in the world of power conversion, the current draw of the load circuit is not constant, but rather pulsed. It is common
in power supply design to size the power path large enough, and make the feedback loop fast enough to support these
pulsed maximum currents. For applications where the pulse width is long or unpredictable, this approach may be
warranted. However, in applications where the pulse width and maximum frequency of occurrence is predictable, such
as digital cell phones or two-way pagers, it may be easier and wiser to increase the energy storage in the output filter
of the power supply and keep the power path small. This leads to the need for a very large value output capacitor.
Panasonic makes a series AL gold cap “super cap” which is a low voltage, large value capacitor in the one farad range.
Before designing a low power DC-DC converter with a “super cap” in its output filter, it is necessary to know the loading
profile (the waveform of the current going into the load from the output of the converter) of the application in which it is
to be used. The converter can then be designed so that the “super cap” can be recharged in the time before the next big
discharge current pulse comes along.
Figure 5 is an example “super cap” charge/discharge diagram showing that the charge into the cap needs to equal the
charge leaving the cap during discharge. This diagram comes from the loading and unloading profile information. In
reality, some extra charge needs to go into the cap to make up for the losses caused by ESR of the cap.
Figure 6 is a schematic for this “super cap” example application.
VIN
"SUPERCAP"
1 F
GOLD CAP
GND
GND
LOI
VOUT
IND
IB
L = 39 μF
D
IOUT
VOUT
VIN
RS
1 k
CS
220 pF
+
+
-
CD
10 μF
RN
1 k
CN
10 μF
30 mA
2 s
60 ms
time
1A
IOUT
FIGURE 6: PULSED LOAD “SUPER CAP” APPLICATION SCHEMATIC
Note: Equal charge into and out of “supercap”
2 s (30 mA) = 60 ms (1A)
Drawing not to scale
FIGURE 5: “SUPER CAP” CHARGE/DISCHARGE DIAGRAM
相關(guān)PDF資料
PDF描述
TK65218 STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR
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TK65218MTL STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TK65218 制造商:TOKO 制造商全稱(chēng):TOKO, Inc 功能描述:STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR
TK65218M 制造商:TOKO 制造商全稱(chēng):TOKO, Inc 功能描述:STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR
TK65218MTL 制造商:TOKO 制造商全稱(chēng):TOKO, Inc 功能描述:STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR
TK65218MTL/18M 制造商:TOKO 制造商全稱(chēng):TOKO, Inc 功能描述:STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR
TK65221 制造商:TOKO 制造商全稱(chēng):TOKO, Inc 功能描述:STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR
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