1. In order to the circuit work in the best status, C1 and C2 must be added in the circuit, and they should be placed as near as the products' footprints.
2. The capacitance of C1,C2 sees external capacitor table, it can be increased properly if required, and tantalum or low ESR electrolytic capacitors may also suffice.
3. Cannot use in parallel and hot swap.
C1
(Ceramic Capacitor)
10μF/25V
C2
(Ceramic Capacitor)
22μF/6.3V
TEST CONFIGURATIONS (TA=25°C)
1.Efficiency and Output Voltage Ripple Test
2 5 .4 m m
2 5 .4 m m
1 2 .7 m m
+Vin
1
C1
D C/D C
C onve rter
2
3
C2
Co pp er strip
1
μ
F
1 0
μ
F
+Vo u t
2.54 mm
2.54 mm
C e ra m ic Ta n ta lu m
Scop e
GND
Cop pe r strip
(Figure 2)
2.Start-up and Load Transient Response Test
5 0.8 m m
+Vin
1
C1
DC/DC
Converter
2
3
C2
Co pper strip
+Vo u t
Scope
GND
Co pper strip
(Figure 3)
The copyright and authority for the interpretation of the products are reserved by MORNSUN
K78A1-1500
Load
Load
A/0-2012
Page 2 of 4
OUTPUT RIPPLE REDUCTION
L
+Vin
1
C1
C2
2 2
μ
F
GND
To reduce output ripple, it is recommended to add a LC filter in output port.
L: Recommended parameter 10μH ~ 47μH.
(Figure 4)
TYPICAL
DERATING CURVE
Operating Temperature
(
C
)
TYPICAL
CHARACTER CURVE
Efficiency VS Input Voltage curve
(Full Load)
K78A1-1500(L)
90
85
16
14
12
Ripple VS Input Voltage curve
(Full Load)
K78A1-1500(L)
Efficiency(%)
80
Ripple(mV)
75
70
65
60
55
50
4.75
6
7
8
9
10
11
12
13
14
10
8
6
4
2
0
4.75
6
7
8
9
10
11
12
13
14
Input Voltage(V)
Input Voltage (V)
Efficiency VS Output Load curve
(Vin=Vin-nominal)
K78A1-1500(L)
90
85
80
Ripple(mV)
75
70
65
60
55
50
10
20
30 40 50 60 70 80
Total Output Current (%)
90
100
16
14
12
10
8
6
4
2
0
10
Ripple VS Output Load curve
(Vin=Vin-nominal)
K78A1-1500(L)
Efficiency(%)
20
30
40
50
Load
60
DC/DC
Converter
2
3
Vout
70
80
90
100
Total Output Current (% )
The copyright and authority for the interpretation of the products are reserved by MORNSUN
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