MB3885 Fujitsu Microelectronics, Inc., MB3885 Datasheet - Page 21
MB3885
Manufacturer Part Number
MB3885
Description
1-channel Dc/dc Converter Ic With Synchronous Rectifier
Manufacturer
Fujitsu Microelectronics, Inc.
Datasheet
1.MB3885.pdf
(29 pages)
- Current page: 21 of 29
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PRECAUTIONS RELATED TO SUPPLY VOLTAGE RANGE
Although the supply voltage range listed under recommended operating requirements is 5.5V-18V, generation
of heat limits the maximum operating supply voltage since the IC’s internal loss varies with the frequency of
oscillation and FET’s total gate charge. When using the MB 3885 in an application, caution must be taken in
relation to supply voltage range.
As shown below, I
gate capacitance (C
Because IC current consumption other than I
following formula.
Power consumption : Pc
Pc (W) : = 0.0065
I
B
(A)
I
Ibias
1
I
2
1
B
V
(average current) can be determined from the total gate charge Qg
iss1
CC
T1
T
, C
V
iss2
CC
, C
Qg
T
rss1
I
1
B
, C
1 2
Ibias
rss2
) of the external FET Q1, Q2, by the following formula.
2
V
B
T2
T
B
I
B
is 6.5 mA, power consumption can be determined from the
Qg
T
2
(Ibias
1
Ibias
2
: = 2 mA)
1
, Qg
2
, charged from the
MB3885
21
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