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FREQ датащи(PDF) 35 Page - fujitsu semiconductor

номер детали FREQ
подробное описание детали  2ch DC/DC converter IC with PFM/ PWM synchronous rectification
PDF  56 Pages
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производитель  FUJITSU [fujitsu semiconductor]
домашняя страница  
Logo FUJITSU - fujitsu semiconductor

FREQ датащи(HTML) 35 Page - fujitsu semiconductor

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35
MB39A214A
Limitation : development tool vendor use only
FUJITSU SEMICONDUCTOR CONFIDENTIAL
DS405-00007-1v0-E
6
0
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8 10 12 1416 18 20 222426 28
Moreover, select the total quantity of the high-side FET electric charge as a guide that does not exceed the
total quantity of the high-side FET electric charge upper limit value shown below.
5
1015202530
35
30
25
20
15
10
5
0
FREQ=GND:CH1
FREQ=GND:CH2
FREQ=OPEN:CH1
FREQ=OPEN:CH2
FREQ=VB:CH1
FREQ=VB:CH2
Whether the mean current value that flows to switching FET is a rated value or less of switching FET is
judged. Each rating value for the switching FET can be calculated roughly by the following formula.
ID_Main > IOUT_MAX
D
ID_Sync > IOUT_MAX
(1 – D)
ID_Main
: high-side FET drain current [A]
ID_Sync
: Low-side FET drain current [A]
IOUT_MAX : Maximum load current [A]
D
: On-duty
VDSS > VIN
VDSS
: Voltage between the high-side FET drain and source and the low-side FET drain and
source [V]
VIN
: Power supply voltage [V]
VIN [V]
Power supply voltage VIN [V]
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