LM4040B Просмотр технического описания (PDF) - Zetex => Diodes
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LM4040B Datasheet PDF : 12 Pages
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Application information
VS
IR +
IL
RS
IL
VR
IR
In a conventional shunt regulator application, an external series resistor (RS) is
connected between the supply voltage, VS, and the LM4040
RS determines the current that flows through the load (IL) and the LM4040 (IR).
Since load current and supply voltage may vary, RS should be small enough to
supply at least the minimum acceptable IR to the LM4040 even when the supply
voltage is at its minimum and the load current is at its maximum value. When
the supply voltage is at its maximum and IL is at its minimum, RS should be
large enough so that the current flowing through the LM4040 is less than 15 mA.
RS is determined by the supply voltage, (VS), the load and operating current, (IL
and IR), and the LM4040’s reverse breakdown voltage, VR.
RS
=
VS
IL
− VR
+ IR
Printed circuit board layout considerations
LM4040s in the SOT23 package have the die attached to pin 1, which results in an electrical
contact between pin 2 and pin 3. Therefore, pin 1 of the SOT-23 package must be left floating or
connected to pin 2.
LM4040s in the SC75 package have the die attached to pin 2, which results in an electrical contact
between pin 2 and pin 1. Therefore, pin 2 must be left floating or connected to pin1.
Issue 4 - July 2008
10
© Diodes Incorporated 2008
www.zetex.com
www.diodes.com
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