PD - Ta
3 WITHOUT HEAT
AMBIENT TEMPERATURE Ta ( C)
The KIA78MXX fixed voltage regulator series has
built-in thermal overload protection which prevents
the device from being damaged due to excessive
The regulators also contain internal short-circuit
protection which limits the maximum output current,
and safe-area protection for the pass transistor which
reduces the short circuit current as the voltage across
the pass transistor is increased. Although the internal
power dissipation is automatically limited, the maximum
junction temperature of the device must be kept
below+150 in order to meet data sheet specifications.
An adequate heatsink should be provided to assure this
limit is not exceeded under worst-case operating
conditions (maximum input voltage and load current)
if reliable performance is to be obtained.
* Required if regulator input is more then 4 inches
form input filter capacitor.
(or if no input filter capacitor is used).
** Optional for improved transient response.
2002. 8. 29
Revision No : 0