Overload Protection
OUTPUT SPECIFICATIONS
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.
Item
Test conditions
Min
0.1
Typ
Max
1
Units
W
Output power
(3.3V output)
(Other output)
(3.3V output)
(5V output)
±1.5
±1.2
20
For Vin change
of 1%
Line regulation
Load regulation
12
10.5
8.3
6.8
6.3
%
15
10% to 100%
load
(9V output)
15
(12V output)
(15V output)
15
Recommended circuit
15
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).
Output voltage accuracy
See tolerance envelope graph
Temperature drift
100% full load
0.03
75
%/°C
(AXXXXD-1W)
(BXXXXD-1W)
(A/BXX24D-1W)
50
75
20MHz
Bandwidth
Ripple & Noise*
mVp-p
100
150
Dual Output
L
100
100
L
+Vo
Vin
Cout
Switching frequency Full load, nominal input
KHz
0V
Cin
DC
DC
DC
DC
Cout
*Test ripple and noise by “parallel cable” method. See detailed operation instructions at Testing of Power
Converter section, application notes.
L
L
GND
-Vo
Single Output
Vin
Note:
L
1.All specifications measured at TA=25°C, humidity<75%, nominal input voltage and rated output load
unless otherwise specified.
2.Dual output models unbalanced load: ±5%.
+Vo
0V
Cout
Cin
GND
TYPICAL CHARACTERISTICS
(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).
Operating Temp.(oC)
EXTERNAL CAPACITOR TABLE (TABLE 1)
Single
Vout
(VDC)
Dual
Vout
(VDC)
OUTLINE DIMENSIONS & PIN CONNECTIONS
Vin
(VDC) (uF)
Cin
Cout
(uF)
Cout
(uF)
First Angle Projection
5
4.7
2.2
2.2
1
5
9
10
4.7
2.2
1
±5
±9
4.7
2.2
1
RECOMMENDED FOOTPRINT
Top view,grid:2.54mm(0.1inch)
diameter:1.00mm(0.039inch)
12
15
24
12
±12
Dual Output
15
±15
0.47
It’s not recommended to connect any external
capacitor in the application field with less than 0.5
watt output.
11
9 8
14
1
7
Output Voltage Regulation and Over-voltage
Protection Circuit
Single Output
The simplest device for output voltage
14
1
9
8
regulation,
over-voltage
and
over-current
7
8
1
7
protection is a
linear voltage regulator with
9
14
11
overheat protection that is connected to the
FOOTPRINT DETAILS
input or output end in series (Figure 2).
Dual Output
Single
Dual
Pin
1
+Vout
REG
GND
NC
GND
NC
Vin
REG
Note:
Unit:mm(inch)
0V
DC DC
8
9
0V
0V
+Vo
GND
REG
-Vout
Pin section:0.50*0.30mm(0.020*0.012inch)
Pin tolerances: 0.10mm( 0.004inch)
General tolerances: 0.25mm( 0.010inch)
+Vo
Single Output
11
No Pin
Vin
-Vo
Vin
+Vout
0V
REG
Vin
REG
DC
DC
(Figure 2)
No parallel connection or plug and play.
APPLICATION NOTE
GND
Requirement on output load
To ensure this module can operate efficiently and reliably, During operation, 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 (A_D -W25/B_LD-W25 series)
MORNSUN reserves the copyright
Specifications subject to change without notice.
A_D-1W & B_LD-1W
A/2-2008
Page 2 of 2
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