EUP3595
Power Dissipation
The maximum allowable power dissipation that this
package is capable of handling can be determined as
follows:
P
DMax
=
(
T
JMax
−
T
A
)
/
θ
JA
Where T is the maximum junction temperature, T is the
ambient temperature, and
θ
JA
is the junction
-to-ambient thermal resistance of the specified package.
The EUP3595 come in the TDFN-8 package that has a
junction-to-ambient thermal resistance (θ
JA
)equal to
50℃/W.This value of
θ
JA
is highly dependant upon
the layout of the PC board. The actual power dissipated
by the EUP3595 follows the equation:
P
DISS
=
(
V
IN
×
I
IN
)
−
N
(
V
LEDX
×
I
LEDX
)
Where N equals the number of active outputs, V
LEDX
is
the L
EDX
LED forward voltage, and I
LEDX
is the current
supplied to the LEDX diode by the EUP3595. Power
dissipation must be less than that allowed by the
package. Please refer to the Absolute Maximum Rating
of the EUP3595.
Input Capacitor Selection
The EUP3595 is designed to run off of a fixed input
voltage. Depending on the stability and condition of
this voltage rail, it may be necessary to add a small
input capacitor to help filter out any noise that may be
present on the line. In the event that filtering is needed,
surface mount multi-layer ceramic capacitors are
recommended. These capacitors are small and
inexpensive. A capacitance of 0.1µF is typically
sufficient.
DS3595 Ver1.0
Feb. 2007
8
EUTECH [ EUTECH MICROELECTRONICS INC ]
