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MB3788
13
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HOW TO SET OUTPUT CURRENT
The output circuit is configured in a push-pull type as shown in Figure 1. The ON current value of the output
current waveform shown in Figure 2 is a constant current and the OFF value set by RE is set by a time constant.
Each output current can be calculated from the following expression:
• ON current = 1.5/R
E (A) (Output current setting pin voltage: VE ≈ 1.5 V)
• The OFF current time constant is proportional to the value of CB.
OFF current
setting part
RE
CB
Drive Tr
OFF
current
ON current
Output
current
0
ON current
OFF current
t
22 µH
(5 V)
3
150 Ω
1000 pF
4 5
1
VCC
Iout
1000 pF
10 µF
-IN1 (E)
8.2 kΩ
-IN1 (C)
MB3788
2
Fig.1 Output Circuit Diagram
Fig.2 Output Current Waveform
Fig.3 Output Pin Voltage and Current Waveforms (Channel 1)
Fig.4 Measurement Circuit Diagram
VE
2.7 kΩ
Vout