US431AL Просмотр технического описания (PDF) - Unisem
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US431AL Datasheet PDF : 6 Pages
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In our previous example, the maximum power dissipa-
tion of the device is calculated under no load and maxi-
mum input supply condition.
The maximum power is calculated using the following
equation :
PMAX
=
VKA
×
VMAX -
RB
VKA
Where :
PMAX = Maximum power dissipation of the 431L
For our example :
PMAX = 3.3 × 6 1-003.3 = 89 mW
As shown in the power dissipation table, both packages
can handle this power dissipation.
Stability
The US431L has many different regions of stability do-
main as a function of the cathode current which are typi-
cal characteristics of the 3 terminal shunt regulators.
However in general the device will be unconditionaly
stable for any cathode current if the capacitor, CO =
1 uF or bigger is connected from Cathode to Anode
pins. If the cathode current is always kept higher than
500uA under minimum line and maximum load condi-
tions , the CO can be cut to 0.01uF and the system will
be stable.
US431L/431AL
Rev. 1.2
5/11/98
2-5
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