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參數(shù)資料
| 型號(hào)： | MAX638 |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 48V-to-5V DC-DC Converter Using MAX638 Switching Step-Down Regulator Borrows Power from Phone Lines |
| 中文描述： | 5V/可調(diào)、CMOS、降壓型、開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 1/4頁 |
| 文件大?。?/td> | 36K |
| 代理商： | MAX638 |
POWER-SUPPLY CIRCUITS
Apr 30, 1999
48V-to-5V DC-DC Converter Using MAX638
Switching Step-Down Regulator Borrows Power
from Phone Lines
The telephone subscriber lines provide -48V voltage, but the equipment on
the customer premises is usually operated from a lower voltage. The circuit
using MAX638 illustrates a conversion of this available voltage to 5V
required in modems, telephone test sets, and other portable systems
connected to subscriber (household) telephone lines.
This circuit
(Figure 1)
is not battery-powered in the usual sense. Its power comes from a -
48V lead-acid battery in a remote central office of the telephone system. The circuit is handy
for use in modems, telephone test sets, and other portable systems connected to subscriber
(household) telephone lines. It is also useful in telemetry systems.
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