ISOLATION SPECIFICATIONS
APPLICATION NOTE
Item
Test conditions
Min
Typ
Max Units
VDC
Requirement on output load
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 is not less than 10% of
the full load, and that this product should never be
operated under no 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.
Tested for 1 minute and 1mA max(Vin/Vout) 1000
Tested for 1 minute and 1mA max(Vo1/Vo2) 1000
Isolation
voltage
Test at 500VDC (Vin/Vout)
Test at 500VDC (Vo1/Vo2)
(Vin/Vout)
1000
1000
Isolation
resistance
MΩ
130
130
Isolation
capacitance
pF
(Vo1/Vo2)
OUTPUT SPECIFICATIONS
Item
Test conditions
Min
0.1
Typ
Max Units
Output power
1
W
Line regulation
Load regulation
Output voltage accuracy
Temperature drift
Ripple & Noise*
Switching frequency
For Vin change of 1%
10% to 100% load
±1.2
15
%
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
12.8
See tolerance envelope graph
100% full load
0.03 %/°C
20MHz Bandwidth
50
75
mVp-p
converter, see (Figure 1).
L
Full load, nominal input
100
KHz
+Vo1
L
*Test ripple and noise by “parallel cable” method. See detailed operation instructions at Testing
of Power Converter section, application notes.
Note:
1. All specifications measured at TA=25°C, humidity<75%, nominal input voltage and rated output load
unless otherwise specified.
2. See below recommended circuits for more details.
Cout
Vin
0V1
L
Cin
DC DC
+Vo2
GND
Cout
0V2
(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).
TYPICAL CHARACTERISTICS
EXTERNAL CAPACITOR TABLE (Table 1)
Vin (VDC) Cin (uF)
Vout(VDC) Cout (uF)
5
12
24
--
4.7
2.2
1
5
9
12
4.7
2.2
1
Operating Temp.(oC)
OUTLINE DIMENSIONS & PIN CONNECTIONS
--
15
0.47
It’s not recommend to connect any external capacitor in
First Angle Projection
the application field with less than 0.5 watt output.
D_(N)D-1W DIP Package
D_(N)S-1W SIP Package
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
(Bottom View)
1
7
14
11 10
9 8
(0.100)
(0.079)
(0.772)
(Figure 2).
Vo1
Vin
REG
0V1
Vo2
0V2
(Side View)
DC DC
0.50
(0.020)
GND
RECOMMENDED FOOTPRINT
Top view,grid:2.54mm(0.1inch)
diameter:1.00mm(0.039inch)
REG
REG
+Vout
Vin
0V
DC DC
+Vout
GND
14
11 10
8
9
0V
1
2
4
5 6 7
(Figure 2)
Overload Protection
1
7
FOOTPRINT DETAILS
D_NS-1W
D_S-1W
Pin
Under normal operating conditions, the output
circuit of these products has no protection against
over-current and short-circuits. The simplest
method is to connect a self-recovery fuse in series
at the input end or add a circuit breaker to the
circuit.
Vin
GND
+Vo1
0V1
Vin
GND
0V1
1
2
4
5
6
7
D_D-1W
Pin
D_ND-1W
GND
NC
GND
NC
1
7
+Vo1
0V2
+Vo2
0V2
+Vo1
0V1
Vin
0V2
+Vo2
0V1
8
+Vo2
0V2
9
+Vo2
10
11
14
Note:
Unit:mm(inch)
+Vo1
Vin
Pin section:0.50*0.30mm(0.020*0.012inch)
Pin section tolerances: 0.10mm( 0.004inch)
General tolerances: 0.25mm ( 0.010inch)
No parallel connection or plug and play.
MORNSUN reserves the copyright
Specifications subject to change without notice.
D_(N)S-1W&D_(N)D-1W A/1-2008
Page 2 of 2
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