OUTPUT SPECIFICATIONS
TYPICAL CHARACTERISTICS
Item
Test Conditions
Min.
0.2
Typ.
Max. Units
Output power
Line regulation
2
±1.2
15
W
For Vin change of ±1%
10% to 100% load (5V output)
10% to 100% load (9V output)
10% to 100% load (12V output)
10% to 100% load (15V output)
12.8
8.3
%
15
Load regulation
6.8
15
6.3
15
Output voltage accuracy
Temperature drift
See tolerance envelope graph
100% full load
±0.03 %/°C
Ripple & Noise*
20MHz Bandwidth
Full load, nominal input
150
50
200 mVp-p
KHz
Switching frequency
*Test ripple and noise by “parallel cable” method. See detailed operation instructions at Testing of
Power Converter. Section, application notes.
RECOMMENDED REFLOW SOLDERING PROFILE
Peak.Temp 260
C
250
10 Sec Max
220
C
200
150
100
90 Sec Max
C
(>220
)
50
0
Operating Temp.(oC)
Time (sec.)
Remark: The curve applies only to the hot air reflow soldering
APPLICATION NOTE
RECOMMENDED CIRCUIT
1) Requirement On Output Load
L
To ensure this module can operate efficiently and reliably, a minimum load is
specified for this kind of DC/DC converter in addition to a maximum load (namely full
load). During operation, make sure the specified range of input voltage is not exceeded,
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.
L
+Vo
0V
Vin
Cout
Cin
DC
DC
GND
(Figure 1)
DC DC
+Vo
Vin
REG
2) Recommended testing and application circuit
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).
GND
0V
+Vo
REG
Vin
DC
DC
GND
0V
(Figure 2)
EXTERNAL CAPACITOR TABLE (TABLE 1)
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).
Vin
(VDC)
Cin
(µF)
Single Vout
(VDC)
Cout
(µF)
5
12
24
--
4.7
2.2
1
5
9
10
4.7
2.2
1
12
15
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.
It’s not recommended to connect any external
capacitor in the application field with less than
0.5 watt output.
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.
H_RN-2W & H_LT-2W
C/0-2012
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