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MB3883 Fiches technique(PDF) 21 Page - Fujitsu Component Limited.

No de pièce MB3883
Description  6-ch DC/DC Converter IC With Synchronous Rectification for voltage step-up and step-down
Download  39 Pages
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Fabricant  FUJITSU [Fujitsu Component Limited.]
Site Internet  http://edevice.fujitsu.com/fmd/en/index.html
Logo FUJITSU - Fujitsu Component Limited.

MB3883 Fiches technique(HTML) 21 Page - Fujitsu Component Limited.

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MB3883
21
• After a CH6 soft start, when the CTL1, 2, CTL3, CTL4, and CTL5 terminals are driven high
The capacitor (Cs) connected to the CS terminal (pin 15) starts charging and the error amp provides a soft start
by comparing the CH1 to CH5 output voltage to the voltage at the CS terminal.
Note : Each of the terminals CTL1,2, CTL3, CTL4, and CTL5 can be switched on or off independently. When any of
these CTL terminals is switched on, a soft start operation is provided as shown in the above timing chart.
t
1.25 V
1.25 V
0.9 V
2 V
2.49 V
Input
CTL ( pin 20)
Output
VB ( pin 27)
C
+IN6 ( pin 5)
CH6 output voltage
Vo6
VREF ( pin 16)
CS ( pin 15)
CH1 to CH3 output
voltage Vo1 to Vo3
(1)
(3) (2)
(4)
CH4, CH5 output
voltage Vo4, Vo5
CTL1, 2 ( pin 21)
CTL3 ( pin 22)
CTL4 ( pin 23)
CTL5 ( pin 24)
(5)
(6)
(7)
(7)’
(6)’
(1) to (2)
: CH6 soft start interval
(3)
: VREF Output start
(4) to (5)
: CH1 to CH3 soft start interval
(6) to (7)
: CH4, CH5 soft start interval
(6)’ to (7)’
: CH4 (CH5) soft start interval (waveform) as CTL4 (CTL5) go “H”
from “L” during CH1 to CH3 soft start interval


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