mb3881pff Fujitsu Microelectronics, Inc., mb3881pff Datasheet - Page 25

• Manufacturer Part Number: mb3881pff
• Description: 8-ch Dc/dc Converter Ic With Synchronous Rectifier For Voltage Step-up And Step-down
• Manufacturer: Fujitsu Microelectronics, Inc.

SETTING THE OUTPUT CURRENT
The output circuit (drive 8) is structured as illustrated below (in the output circuit diagram). As found in “Output
Current Waveform” below, the source current value of the output current waveform has a constant current setting.
Note that the source current is set by the following equation:
Output source current : (V
0
B
R
B
)
0.6 V
Source current
80 : = 48 R
In the output circuit diagram
Output source current (Peak)
I
Output current waveform
Sink current
Output source
B
current
[A] (V
t
B
: = 0.6 V)
33
33
Output sink current (Peak)
80 I
70 k
2
1
59
64
Output source
OUT8
RB8
GND (O) 2
VCC (O) 2
Output sink
current
current
External NPN transistor
R
B
MB3881
V
B
: = 0.6 V
25