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黄华炎 发表于 2011-3-28 23:51
请问,2脚是什么脚。。
3脚又是什么脚,起什么作用。。
2脚LINE-SENSE (L) Pin Operation (Y and R Packages)
When current is fed into the LINE-SENSE pin, it works as a
voltage source of approximately 2.6 V up to a maximum
current of +400 μA (typical). At +400 μA, this pin turns into
a constant current sink. Refer to Figure 12a. In addition, a
comparator with a threshold of 1 V is connected at the pin and
is used to detect when the pin is shorted to the SOURCE pin.
3脚EXTERNAL CURRENT LIMIT (X) Pin Operation
(Y and R Packages)
When current is drawn out of the EXTERNAL CURRENT
LIMIT pin, it works as a voltage source of approximately 1.3
V up to a maximum current of –240 μA (typical). At –240 μA,
it turns into a constant current source (refer to Figure 12a). |
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