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MB39A114 Datasheet, PDF (33/54 Pages) Fuji Electric – DC/DC Converter IC for Charging Li-ion Battery | |||
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MB39A114
PC = ID2 Ã RDS (ON) Ã Duty
= 32 Ã 0.018 Ã 0.672
=: 0.109 W
VD à ID à tr à fosc
PS (ON) =
6
25 Ã 3 Ã 15 Ã 10â9 Ã 300 Ã 103
=
6
=: 0.056 W
VD à ID (Max) à tf à fosc
PS (OFF) =
6
25 Ã 3.6 Ã 42 Ã 10â9 Ã 300 Ã 103
=
6
=: 0.189 W
PT = PC + PS (ON) + PS (OFF)
=: 0.109 + 0.056 + 0.189
=: 0.354 W
The above power dissipation figures for the µPA2714GR are satisfied with ample margin at 2.0 W.
12.6 V setting
Input voltage VIN (Max) = 22 V, output voltage VO = 12.6 V, drain current ID = 3 A, oscillation frequency fosc =
300 kHz, L = 15 µH, drain-source on resistance RDS (ON) =: 18 mâ¦, tr =: 15 ns, tf =: 42 ns
Drain current (Max) : ID (Max)
ID (Max) = Io +
VIN (Max) â Vo
ton
2L
= 3+
22 â 12.6
1
Ã
à 0.572
2 Ã 15 Ã 10â6
300 Ã 103
=: 3.6 A
Drain current (Min) : ID (Min)
ID (Min) = Io â
VIN (Max) â Vo
tON
2L
= 3â
22 â 12.6
1
Ã
à 0.572
2 Ã 15 Ã 10â6
300 Ã 103
=: 2.4 A
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