ISOLATION SPECIFICATIONS
TYPICAL CHARACTERISTICS
Item
Test Conditions
Min.
3000
1000
Typ.
15
Max.
Units
VDC
MΩ
Isolation voltage
Tested for 1 minute and 1mA max
Isolation resistance Test at 500VDC
Isolation capacitance
pF
RECOMMENDED REFLOW SOLDERING PROFILE
250oC
250
10 Sec Max
220oC
200
150
100
90 Sec Max
(>220oC)
50
0
Time (sec.)
Remark: The curve applies only to the hot air reflow soldering
Operating Temp.(oC)
APPLICATION NOTE
RECOMMENDED CIRCUIT
1) Requirement on output load
L
L
+Vo
0V
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.
Vin
Cout
Cin
DC
DC
GND
(Figure 1)
DC DC
2) Recommended testing circuit
+Vo
Vin
REG
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 greatest capacitance of its filter capacitor sees (Table 1).
GND
0V
REG
+Vo
Vin
DC
DC
GND
0V
(Figure2)
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).
EXTERNAL CAPACITOR TABLE (TABLE 1)
Vin
Cin
Vout
Cout
(VDC)
(µF)
(VDC)
(µF)
5
4.7
5
10
4) Overload Protection
It’s not recommended to connect any external
capacitor in the application field with less than 0.5
watt output.
Under normal operating conditions, the output circuit of these products has no protection
against over load. The simplest method is to connect a self-recovery fuse in series at the
input end or add a circuit breaker to the circuit.
4) 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_RN-1W&F_RT-1W
B/1-2010
Page 2 of 3
MORNSUN [ MORNSUN SCIENCE& TECHNOLOGY LTD. ]
