Datasheet

Switching Element
2
125COND DS _ RMS DSon( C )
P I R=
(39)
125
0 35
DSon( C )
R .= W
(40)
16
2
3
OUT (max) IN _ RECTIFIED(min)
DS _ RMS
IN _ RECTIFIED(min) OUT
P V
I
V Vp
= -
(41)
350 16 120
2 3 54
120 3 390
DS _ RMS
W V
I . A
V Vp
´
= - =
´
(42)
2
3 54 0 35 4 38
COND
P . A . . W= ´ W =
(43)
5 0 4 5= =
r f
t . ns ,t . ns
(44)
780
OSS
C pF=
(45)
( )
2
0 5 0 5
-
= + +
SW SW ( typ ) OUT IN PEAK (max) r f OSS OUT
P f ( . V I t t . C V )
(46)
( )
2
65 0 5 390 6 39 5 4 5 0 5 780 390 4 626= ´ ´ + + ´ ´ =
SW
P kHz( . V . A n . ns . pF V ) . W
(47)
4 38 4 626 9 007+ = + =
COND SW
P P . W . W . W
(48)
UCC28019A
SLUS828B – DECEMBER 2008 – REVISED APRIL 2009 .................................................................................................................................................. www.ti.com
The conduction losses of the switch are estimated using the R
DS(on)
of the FET at 125 ° C , found in the FET data
sheet, and the calculated drain to source RMS current, I
DS_RMS
:
The switching losses are estimated using the rise time, (t
r
), and fall time, (t
f
), of the gate, and the output
capacitance losses.
For the selected device:
Total FET losses:
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