TYPICAL EFFICIENCY CURVE
LD03-10BXX Efficiency
85
80
75
70
65
60
55
50
45
10
20
30
40
50
60
70
80
90
100
Load(%)
LD03-10B05 115VAC
Efficiency(%)
LD03-10B05 230VAC
Efficiency(%)
LD03-10B12 115VAC
Efficiency(%)
LD03-10B12 230VAC
Efficiency(%)
LD03-10B24 115VAC
Efficiency(%)
LD03-10B24 230VAC
Efficiency(%)
LD05-20BXX Efficiency
90
85
80
75
70
65
60
55
50
10
20
30
40
50 60 70
Load(%)
80
90 100
LD05-20B05 115VAC
Efficiency(%)
LD05-20B05 230VAC
Efficiency(%)
LD05-20B12 115VAC
Efficiency(%)
LD05-20B12 230VAC
Efficiency(%)
LD05-20B24 115VAC
Efficiency(%)
LD05-20B24 230VAC
Efficiency(%)
ANEAR MEASURE
LD03-10BXX
Fuse
C3
C1
Connect Oscillograph probe
Copper sheet
Efficiency(%)
Efficiency(%)
LD05-20BXX
FUSE
L
Connect Oscillograph Probe
Copper sheet
C2
Load
Load
N
3
25.4mm
25.4mm
TYPICAL APPLICATIONS
LD03-10B**
*FUSE
L
*NTC
LD05-20B**
L
+V0
C1
C2
TVS
*FUSE *NTC
L
L
+V0
C1
C2
M OV
+
C3
22
26
-V0
+
RL
+
RL
-V0
N
N
N
N
Figure1
* FUSE *NTC
Figure 2
L
+V0
L
C6
NF
C1 C2 TVS
*FUSE
L
RL
C6
NF
L
C7
+V0
C1
C2
C7
MOV
C8
C3
+
22
26
-V0
+
+
C8
-V0
RL
N
N
N
N
Figure3
LD03 EMC
Application Figure
Figure4
LD05 EMC
Application Figure
EXTERNAL CAPACITORS TYPICAL VALUE(Unit:
µF)
model
LD03-10B03
LD03-10B05
LD03-10B09
LD03-10B12
LD03-10B15
LD03-10B24
Note：
1. Output filtering capacitors C1, C3 is electrolytic capacitors, It is recommended to use high frequency and low impedance electrolytic capacitors. For capacitance
and current of capacitor please refer to manufacture’s datasheet. Voltage derating of capacitor should be 80% or above. C2 is ceramic capacitor,
high frequency noise. TVS is a recommended component to protect post-circuits (when converter fails).
2. MOV is required to LD03 models，model: 471KD05, it is used to protect the device under surge.
3. It is recommended to connect FUSE, the parameter for LD03 models is 0.5A/250V slow blow, for LD05 models is1A/250V slow blow. External input NTC is
recommended to use 5D-14 or 10Ω/2W wire-round resistor.
4. If EMC performance is required, recommended to add
“EMC
filter” at the input end(see figure 3,4)
C6:X capacitor, recommended parameter 0.1uF/275V;
C7,C8:Y capacitor, recommended parameter 220pF/2000V;
NF: common model choke, recommended inductance is about 10mH-30mH.
5. LD03 models: Terminals 22 and 26 are internal rectification and filtering terminals. To protect the models further, it is recommended to connect an electrolytic
capacitor C3 (it is recommended to be 4.7uF/400V). If operation voltage of the module is between 160~264VAC, C3 can be removed.
it is used to filter
C1
150
150
120
120
120
68
C2
0.1
0.1
0.1
0.1
0.1
0.1
C3
4.7/400V
4.7/400V
4.7/400V
4.7/400V
4.7/400V
4.7/400V
TVS
P4KE6.8A
P4KE6.8A
P4KE12A
P4KE20A
P4KE20A
P4KE30A
model
LD05-20B03
LD05-20B05
LD05-20B09
LD05-20B12
LD05-20B15
LD05-20B24
C1
47
47
33
33
33
10
C2
0.1
0.1
0.1
0.1
0.1
0.1
MORNSUN reserves the copyright
Specifications subject to change without notice.
LD03-05
A/2-2008
Page 3 of 4
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