MB3825A Fujitsu Microelectronics, Inc., MB3825A Datasheet - Page 21

• Manufacturer Part Number: MB3825A
• Description: 6-ch DC/DC Converter ic With Synchronous Rectifier
• Manufacturer: Fujitsu Microelectronics, Inc.

METHOD OF SETTING THE OUTPUT CURRENT
Figure 3 shows the configuration of the output circuits, and Figure 4 illustrates how the sink current value of the
output current waveform has a constant current setting. Note that the sink current is set by the following formula
• Sink current
Figure 3. Output circuit (main side)
Figure 4. Output current waveform
comparator
To PWM
Output current
(V
B
/R
B
)
60
0
base current
Output OFF
Output ON
speed-up
56/R
driver
B
[A]
Sink current
1
Speed-up current
t
60
10 k
Source current (peak)
100 k
Sink current
GND (O)
CB1
OUT1
VB
CB2
VCC(O)
R
B
Source
current
V
B
External PNP transistor
MB3825A
21