Ultra Low Noise, Ultra Compact, Isolated type DC-DC Converter
b
6Watt BLC05 Series
7-4 Activation and deactivation voltage
This product has an under voltage lock out function to prevent malfunction when there is low input voltage.
The activation voltage and deactivation voltage is within the range shown in the table below.
Range of activation and
deactivation voltage
2.8 to 4.4V
7-5 Input circuit protection function
This input circuit has a built-in fuse to protect the secondary circuit against over current that runs for any
reason.
Rated current and fusing current of the built-in fuse are as shown in the following table. Power supply should
have more current capacity than the following fusing current to ensure a fuse blowout in an emergency.
Rated current
Fusing current
5.0A
10A or more
8. Protection against reverse connection of input power supply (example)
This product may be damaged if erroneously connected with reverse input polarity. To cope with a possible
reverse connection, add a protection circuit as shown in the following figure.
The following is an example using a fuse and a diode.
Fuse
+Vin
+Vout
1
7
BLC-S
Series
Load
+Vin
D1
C1
C2
C3
-Vin
-Vout
2
6
9. Common mode noise reduction method (example)
To reduce common mode noise of this product, connect a capacitor of 1000pF or so (C4) between the primary
and secondary terminals as shown in the following figure. In this case, note that using a capacitor of too much
capacitance may result in the increase of coupling capacitance between primary and secondary terminals.
Also, select a capacitor in consideration of required withstand voltage. (Noise on the primary side may run
through to the secondary side through C4 according to conditions, so check in actual use conditions.)
Fuse
+Vin
+Vout
1
7
BLC-S
Series
Load
+Vin
D1
C1
C2
C3
-Vout
-Vin
2
6
C4
10. Input feedback noise reduction method (example)
Input feedback noise from the convertor can be reduced by designing a Pi filter at input side as shown in the
following figure. Add as needed.
L1
+Vin
1
2
7
6
BLC-S
Series
+Vin
C1
C2
-Vin
9
DC-DC Converter
BDD20170524_A01
BELLNIX [ Bellnix ]
