OUTPUT SPECIFICATIONS
TYPICAL CHARACTERISTICS
Item
Test conditions
Min.
0.1
Typ.
Max.
1
Units
W
Output power
(3.3V output)
(others output)
(3.3V output)
(5V output)
±1.5
±1.2
20
For Vin change
of ±1%
Line regulation
Load regulation
15
12.8
8.3
6.8
6.3
6.0
15
%
(9V output)
15
10% to 100%
load
(12V output)
(15V output)
(24V output)
15
15
15
Output voltage accuracy
See tolerance envelope graph
Temperature drift
Ripple& Noise*
100% full load
20MHz Bandwidth
±0.03
%/°C
mVp-p
kHz
100
100
150
Switching frequency Full load, nominal input
*Test ripple and noise by “parallel cable” method. See detailed operation instructions at Testing of Power
Converter section, application notes.
COMMON SPECIFICATIONS
Operating Temp.(oC)
Item
Test conditions
Min.
Typ.
25
Max.
95
Units
%
Storage humidity
Operating temperature
Storage temperature
Temp. rise at full load
Lead temperature
Short circuit protection*
Cooling
RECOMMENDED CIRCUIT
-40
-55
85
125
30
Single Output
°C
L
L
+Vo
0V
Vin
1.5mm from case for 10 seconds
300
1
Cout
Cin
DC DC
s
GND
Free air convection
Plastic (UL94-V0)
(Figure 1)
Case material
MTBF
3500
k hours
F_M-1W series
F_N-1W series
1.05
1.8
Single Output
Vin
Weight
g
+Vo
REG
*Supply voltage must be discontinued at the end of short circuit duration.
DC
DC
GND
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 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 (Figure 1).
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 recommended capacitance of its filter capacitor sees (Table 1).
Vin
(VDC)
Cin
(μF)
Single Vout
(VDC)
Cout
(μF)
3.3/5
12
24
-
4.7
2.2
1
3.3/5
9
10
4.7
2.2
1
12
-
15/24
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 (Figure 2).
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_M-1W & F_N-1W
B/1-2012
Page 2 of 3
MORNSUN [ MORNSUN SCIENCE& TECHNOLOGY LTD. ]
