ISOLATION SPECIFICATIONS
TYPICAL CHARACTERISTICS
Tolerance Envelope Graph
Item
Test conditions
Min.
Typ.
Max.
Units
VDC
MΩ
+10%
+5%
Nominal
Voltage
Isolation voltage
Tested for 1 minute and 1 mA max 1000
Isolation resistance Test at 500VDC
1000
Min.
+2.5%
-2.5%
-7.5%
COMMON SPECIFICATIONS
Item
Test conditions
Typ.
15
Max.
95
Units
%
Storage humidity range
Operating temperature
Storage temperature
Temp. rise at full load
Lead temperature
-40
-55
85
10%
50%
100%
Output Current %( )
125
25
°C
Temperature Derating Graph
1.5mm from case for 10 seconds
300
120
Short circuit protection*
Cooling
1
S
100
Free air convection
Plastic (UL94-V0)
80
60
Case material
MTBF
Safe Operating Area
3500
K hours
g
40
20
0
Weight
2.1
*Supply voltage must be discontinued at the end of short circuit duration.
-40
0
40
85 105
(
)
Ambient Temperature
C
OUTPUT SPECIFICATIONS
RECOMMENDED CIRCUIT
Item
Test conditions
Min.
0.1
Typ.
Max.
Units
W
Output power
Line regulation
1
±1.2
20
Dual Output
L
For Vin change of 1%
L
+Vo
0V
Vin
Cout
Cout
(3.3 output)
12
10.5
8.3
6.8
6.3
5
Cin
DC
DC
L
L
GND
(5V output)
(9V output)
(12V output)
(15V output)
(24V output)
15
-Vo
%
15
Single Output
Vin
Load regulation
10% to 100% load
L
+Vo
0V
15
Cout
15
Cin
DC
DC
GND
15
(Figure 1)
Output voltage accuracy
See tolerance envelope graph
Temperature drift
100% full load
0.03
75
%/°C
Dual Ou tput
+Vout
0V
(AXXXXS-1W)
(BXXXXLS-1W)
(AXX24LS-1W)
(BXX24LS-1W)
50
75
REG
REG
REG
Vin
REG
100
150
150
DC DC
20MHz
Bandwidth
Ripple & Noise
mVp-p
GND
-Vout
100
100
100
Single Output
+Vout
0V
Vin
REG
Switching frequency Full load, nominal input
KHz
DC
DC
*Test ripple and noise by “parallel cable” method. See detailed operation instructions at Testing of Power
Converter section, application notes.
GND
Note: Dual output models unbalanced load: ±5%.
(Figure 2)
APPLICATION NOTE
1) Requirement on output load
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 (A_S
-W2/B_LS-W2 series).
EXTERNAL CAPACITOR TABLE (TABLE 1)
Vin Cin Single Cout Dual Cout
(VDC) (uF)
Vout (uF)
(VDC)
Vout
(uF)
(VDC)
3.3/5
12
15
24
-
4.7
2.2
2.2
1
3.3/5
9
10
4.7
2.2
1
±5
±9
4.7
2.2
1
12
±12
±15
±24
2) Overload Protection
15
0.47
0.47
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.
-
24
1
It’s not recommended to connect any external
capacitor in the application field with less than 0.5
watt output.
3) Recommended 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).
4) 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).
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.
A_S-1W & B_LS-1W
A/3-2010
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