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| 型号： | TK65130MTL |
| 厂商： | ASAHI KASEI POWER DEVICES CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 102 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | SOT-23L, SMT-6 |
| 文件页数： | 11/20页 |
| 文件大小： | 158K |
| 代理商： | TK65130MTL |
January 2001 TOKO, Inc.
Page 19
TK651xxM
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.
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
VIN
" SUPERCAP"
1 F
GOLD CAP
GND
LOI
VOUT
IND
IB
L = 39 H
D
IOUT
VOUT
VIN
RS
1 k
CS
220 pF
+
-
CD
10 F
RN
1 k
CN
10 F
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