OUTPUT SPECIFICATIONS
TYPICAL CHARACTERISTICS
Tolerance Envelope Graph
Item
Test Conditions
Min
0.1
Typ. Max Units
+10%
+5%
Nominal
Voltage
Output power
Line regulation
1
±1.2
20
W
+2.5%
-2.5%
-7.5%
For Vin change of ±1%
10%to100% load (3.3V output)
10%to100% load (5V output)
10%to100% load (12V output)
10%to100% load (15V output)
15
12.8
6.8
%
15
Load regulation
10
6.3
10
10%
50%
100%
Output Current %( )
Output voltage accuracy
Temperature drift
See tolerance envelope graph
100% full load
0.03 %/°C
Temperature Derating Graph
Output ripple &Noise*
Switching frequency
20MHz Bandwidth
75
100 mVp-p
kHz
120
100
100
Full load, nominal input
80
60
*Test ripple and noise by “parallel cable” method. See detailed operation instructions at Testing of Power
Converter section, application notes.
Safe Operating Area
40
20
0
-40
0
40
85 105
(
)
Ambient Temperature
C
RECOMMENDED REFLOW SOLDERING PROFILE
RECOMMENDED CIRCUIT
260o C
250
10 Sec Max
220o C
L
L
+Vo
0V
200
Vin
Cout
Cin
DC
DC
150
GND
90 Sec Max
(>220o C)
100
(Figure 1)
DC DC
50
+Vo
0
Vin
GND
REG
Time (sec.)
Remark: The curve applies only to the hot air reflow soldering
0V
APPLICATION NOTE
REG
+Vo
Vin
1) Requirement on output load
DC
DC
To ensure this module can operate efficiently and reliably, During operation, the minimum
output load could not be less than 10% of the full load. If the actual output power is very
small, please connect a resistor with proper resistance at the output end in parallel to
increase the load, or use our company’s products with a lower rated output power.
GND
0V
（Figure 2）
2) Recommended testing circuit
EXTERNAL CAPACITOR TABLE (TABLE 1)
If you want to further decrease the input/output ripple, an “LC” filtering network may be
connected to the input and output ends of the DC/DC converter, see (Figure1).
It should also be noted that the inductance and the frequency of the “LC” filtering network
should be staggered with the DC/DC frequency to avoid mutual interference. However, the
capacitance of the output filter capacitor must be proper. If the capacitance is too big, a
startup problem might arise. For every channel of output, provided the safe and reliable
operation is ensured, the greatest capacitance of its filter capacitor sees (Table 1).
Vin
(VDC)
Cin
(µF)
Single Vout
(VDC)
Cout
(µF)
3.3/5
12
4.7
2.2
-
3.3/5
12
10
2.2
1
-
15
It’s not recommended to connect any external
capacitor in the application field with less than 0.5
watt output.
3) Output Voltage Regulation and Over-voltage Protection Circuit
The simplest device for output voltage regulation, over-voltage and over-current protection
is a linear voltage regulator with overheat protection that is connected to the input or output
end in series (Figure2).
4) Overload Protection
Under normal operating conditions, the output circuit of these products has no protection
against overload. The simplest method is to connect a self-recovery fuse in series at the
input end or add a circuit breaker to the circuit.
5) No parallel connection or plug and play
The copyright and authority for the interpretation of the products are reserved by Mornsun
Specifications subject to change without notice.
F_XT-1W
A/0-2010
Page 2 of 3
MORNSUN [ MORNSUN SCIENCE& TECHNOLOGY LTD. ]
