BD8160AEFV データシートの表示（PDF） - ROHM Semiconductor
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BD8160AEFV Datasheet PDF : 19 Pages
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BD8160AEFV
Technical Note
●Selecting Application Components
(1) Output LC constant (Boost Converter)
The inductance L to use for output is decided by the rated current ILR and input current maximum value IOMAX of the
inductance.
IL
IOMAX + IL should not
reach the rated
value level
VCC
IL
ILR
IOMAX mean
current
Vo
L
Co
t
Fig. 29
Fig. 30
Adjust so that IOMAX + ∆IL does not reach the rated current value ILR. At this time, ∆IL can be obtained by the following
equation.
∆IL =
1
L
Vcc
Vo-Vcc
Vo
1
f
[A]
Set with sufficient margin because the inductance L value may have the dispersion of ± 30%.
For the capacitor C to use for the output, select the capacitor which has the larger value in the ripple voltage VPP
permissible value and the drop voltage permissible value at the time of sudden load change.
Output ripple voltage is decided by the following equation.
∆VPP = ILMAX RESR +
1
fCo
Vcc
Vo
( ILMAX -
∆IL
2
)
[V]
Perform setting so that the voltage is within the permissible ripple voltage range.
For the drop voltage VDR during sudden load change, please perform the rough calculation by the following equation.
VDR =
∆I
Co
10 µs [V]
However, 10 µs is the rough calculation value of the DC/DC response speed.
Make Co settings so that these two values will be within the limit values.
(2) Output LC constant (Buck Converter)
The inductance L to use for output is decided by the rated current ILR and input current maximum value IOMAX of the
inductance.
IL
IOMAX + IL should not
reach the rated
value level
ILR
IOMAX mean
current
t
VCC
IL
Vo
L
Co
Fig. 31
Fig. 32
Adjust so that IOMAX + ∆IL does not reach the rated current value ILR. At this time, ∆IL can be obtained by the following
equation.
∆IL =
1
L
(Vcc - Vo)
Vo
Vcc
1
f
[A]
Set with sufficient margin because the inductance L value may have the dispersion of ± 30%.
For the capacitor C to use for the output, select the capacitor which has the larger value in the ripple voltage VPP
permissible value and the drop voltage permissible value at the time of sudden load change.
Output ripple voltage is decided by the following equation.
∆VPP
=
∆IL RESR +
∆IL
2Co
Vo
Vcc
1
f
[V]
Perform setting so that the voltage is within the permissible ripple voltage range.
For the drop voltage VDR during sudden load change, please perform the rough calculation by the following equation.
VDR =
∆I
Co
10 µs [V]
However, 10 µs is the rough calculation value of the DC/DC response speed.
Make Co settings so that these two values will be within the limit values.
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11/18
2009.07 - Rev.B
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