MB3827 Datasheet, PDF (23/41 Pages) Fujitsu Component Limited. – 6-ch DC/DC Converter IC With Synchronous Rectification for voltage step-up and step-down

MB3827
• Starting CTL5 (CTL6) after a soft start on channels 1 to 4 and 7
When CTL5 (CTL6) is started after a soft start on channels 1-4 and 7, the capacitor (CS) connected to the CS1-6
terminal (pin 30) start charging. The error amplifier thus provides the output voltage from channel 5 (6) with a
soft start operation in comparison with the voltage at pin CS1-6.
CTL1−4, 7 (pin 27)
DTC7 (pin 9)
Channel 7
output voltage
CS1−6 (pin 30)
0.77 V
0.6 V
0.3 V
1.26 V
Channel 1 to 4
output voltage
CTL5 (pin 28)
(CTL6 (pin 29))
Channel 5
output voltage VO5
(Channel 6
output voltage VO6)
(1) (2) (3)
(4)
t
(5)
(6)
(5)’ (6)’
(1) to (2) : Channel 7 soft start interval
(3) to (4) : Channel 1 to 4 soft start interval
(5) to (6) : Channel 5 (channel 6) soft start interval
(5)’ to (6)’: Channel 5 (channel 6) soft start interval (wave form) as CTL5 (CTL6)
goes “L” to “H” during a soft start on channels 1-4.
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