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參數(shù)資料
| 型號： | LM828MWC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 56 kHz SWITCHING FREQ-MAX, UUC |
| 封裝： | WAFER |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 221K |
| 代理商： | LM828MWC |
Other Applications (Continued)
In Figure 5, the LM828 is used to provide a positive voltage
doubler and a negative voltage converter. Note that the total
current drawn from the two outputs should not exceed 40
mA.
Regulating V
OUT
It is possible to regulate the negative output of the LM828 by
use of a low dropout regulator (such as the LP2980). The
whole converter is depicted in Figure 6. This converter can
give a regulated output from 1.8V to 5.5V by choosing the
proper resistor ratio:
V
out =Vref (1+R1/R2)
where, V
ref = 1.23V
Note that the following conditions must be satisfied simulta-
neously for worst case design:
V
in_min >Vout_min +Vdrop_max (LP2980)
+I
out_max xRout_max (LM828)
V
in_max < Vout_max +Vdrop_min (LP2980)
+I
out_min xRout_min (LM828)
DS100137-11
FIGURE 5. Combined Voltage Doubler and Inverter
DS100137-12
FIGURE 6. Combining LM828 with LP2980 to Make a Negative Adjustable Regulator
LM828
www.national.com
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