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MB39A104 Datasheet, PDF (25/36 Pages) Fujitsu Component Limited. – 2-ch DC/DC Converter IC | |||
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MB39A104
PC = ID 2 Ã RDS (ON) Ã Duty
= 3 2 Ã 0.05 Ã 0.263
=: 0.118 W
PS (ON)
=
VD (Max) à ID à tr à fOSC
6
=
19 Ã 3 Ã 100 Ã 10â9 Ã 500 Ã 103
6
=: 0.475 W
PS (OFF)
=
VD (Max) à ID (Max) à tf à fOSC
6
=
19 Ã 3.25 Ã 100 Ã 10â9 Ã 500 Ã 103
6
=: 0.515 W
PT = PC + PS (ON) + PS (OFF)
=: 0.118 + 0.475 + 0.515
=: 1.108 W
The above power dissipation figures for the TPC8102 are satisfied with ample margin at 2.4 W (Ta = +25 °C) .
CH2
Input voltage VIN (Max) = 19 V output voltage VO = 3.3 V, drain current ID = 3 A, Oscillation frequency
fOSC = 500 kHz, L = 15 µH, drain-source on resistance RDS (ON) =: 50 mâ¦, tr = tf =: 100 ns.
Drain current (Max) : ID (Max)
ID (Max)
= IO +
VIN â VO
2L
ton
=3+
19 â 3.3
2 Ã 15 Ã 10â6
Ã
1
500 Ã 103
à 0.174
=: 3.18 (A)
Drain current (Min) : ID (Min)
ID (Min)
= IO â
VIN â VO
2L
ton
=3â
19 â 3.3
2 Ã 15 Ã 10â6
Ã
1
500 Ã 103
à 0.174
=: 2.82 (A)
25
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