DC/DC Converter
A_S-2WR2 & B_S-2WR2 series
Efficiency Vs Innput Voltage (Full Load)
100
95
90
85
100
90
80
B0505S-2WR2
B0505S-2WR2
Efficiency Vs Output Load(Vin=5V)
Efficiency(%)
70
75
70
65
60
55
50
4.5 4.6 4.7 4.8 4.9
5
5.1 5.2 5.3 5.4 5.5
Efficiency(%)
80
60
50
40
30
20
10
0
10
20
30
40
50
60
70
80
90
100
Input Voltage(V)
100
95
90
85
B1212S-2WR2
Output Current Percentage(%)
Efficiency Vs Input Voltage (Full Load)
100
90
80
70
60
50
40
30
20
10
0
Efficiency Vs Output Load(Vin=12V)
B1212S-2WR2
Efficiency(%)
80
75
70
65
60
55
50
10.8
11.1
11.4
11.7
12.0
12.3
12.6
12.9
13.2
Efficiency(%)
Input Voltage(V)
10
20
30
40
50
60
70
80
90
100
Output Current Percentage(%)
Design Reference
1. Typical application circuit
If it is required to further reduce input and output ripple, a filter capacitor may be connected to the input and output terminals, see Fig.3.
Moreover, choosing a suitable filter capacitor is very important, start-up problems may be caused if the capacitance is too large. Under the
condition of safe and reliable operation, the recommended capacitive load values are shown in Table 1.
Dual Output
Vin
GND
Cin
DC DC
Cout
Cout
+Vo
0V
-Vo
+Vo
Recommended capacitive load value table (Table 1)
Vin
(VDC)
5
9/12
15
24
Cin
(μF)
4.7
2.2
2.2
1
Single Vo
(VDC)
3.3/5
9/12
15/24
--
Cout
(μF)
10
2.2
1
--
Dual Vo
(VDC)
±3.3/±5
±9/±12
±15/±24
--
Cout
(μF)
4.7
1
0.47
--
Singl e Output
Vin
GND
Cin
DC DC
Fig.3
Cout
0V
2. EMC typical recommended circuit (CLASS B)
LDM
Vin
C1
GND
C2
Vin
+Vo
C3
LOAD
Input voltage (VDC)
C1/C2
EMI
CY
C3
LDM
5/9/12/15
4.7μF /50V
--
6.8μH
24
1nF/2KV
DC/DC
GND
-Vo
(0V)
Refer to the Cout in Fig.3
Fig. 4
CY
Note: 1. 24V input series is subject to CY (CY : 1nF/2KV).
2. It is not needed to add the component in the peripheral circuit when
parameter with the symbol of "--".
2015.04.20-A/2
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