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DIPIPM+ Series Application note
(2) Internal circuit of Fo terminal
Fo terminal is an open drain type. When Fo output is input into MCU(controller) directly, it is necessary to
note the dependency of V
signal level fits to the input threshold voltage of MCU. In the case of pulling up to 5V supply, it is
recommended to pull up by 10kΩ resistor.
When the opto-coupler is driven by Fo output directly, the maximum Fo sink current becomes 5mA or less.
To assure I
=5mA, it will be needed to pull up to 15V supply since Fo output may be max 4.75V (@I
FO
25°C).
If max 5mA coupler driving current is not enough, it is necessary to apply buffer circuit for increasing
driving current.
Table 3-1-3 shows the typical V-I characteristics of Fo terminal.
Item
Fault output voltage
3.1.6 Snubber circuit
In order to prevent DIPIPM from destruction by extra surge, the wiring length between the smoothing capacitor
and P terminal (DIPIPM) – N1 points (shunt resistor terminal) should be designed as short as possible. Also, a
0.1μ~0.22μF snubber capacitor with high withstanding voltage should be mounted in the DC-link and close to P
and N1.
In order to suppress the surge voltage maximally, the wiring at part-A (including shunt resistor parasitic
inductance) should be designed as small as possible as shown in Fig.3-1-9.
Publication Date: September 2016
on I
(V
=max0.95V @I
FO
FO
FO
Symbol
Condition
V
V
=0V, Fo=10kΩ 5V Pulled-up
FOH
SC
V
V
=1V, I
=1mA
FOL
SC
FO
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
1
Fig.3-1-8 Fo terminal typical V-I characteristics (V
Wiring Inductance
+
-
Fig.3-1-9 Recommended snubber circuit location
=1mA, 25°C) and set pull up resistance so that Fo
FO
Min.
2
3
4
I
(mA)
FO
D
DIPIPM
P
NU
NV
Shunt resistor
NW
35
Typ.
Max.
－
－
4.9
－
－
0.95
5
=15V, T
=25°C)
j
=5mA,
FO
Unit
V
V
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