MB3827 Datasheet, PDF (29/41 Pages) Fujitsu Component Limited. – 6-ch DC/DC Converter IC With Synchronous Rectification for voltage step-up and step-down

MB3827
s METHOD OF SETTING THE OUTPUT CURRENT
“Output circuit (main side)” shows the configuration of the output circuits (Drive1-3,Drive7), and “Output current
waveform” illustrates how the source current value of the output current waveform has a constant current setting
(When channel 1 operates as a step-up unit). Note that the source current is set by the following formula
Output source current = (VB/RB) × 80 =: 48/RB [A] (VB =: 0.6V)
Output circuit (main side)
VCC (O)
Source
current setting
I
80I
External NPN transistor
× 33
Output sourrce current
OUT
Output sink current
Sink current
setting
× 33
70 kΩ
0.6 V
RB
GND (O)
RB
VB =: 0.6V
Output current waveform
Output current ⁰
Output source current (peak)
Output source current
Output sink current (peak)
t
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