B0505LT-2W Datasheet, PDF (2/2 Pages) RSG Electronic Components GmbH – FIXED INPUT ISOLATED & UNREGULATED 2W SINGLE OUTPUT ULTRAMINIATURE SMD PACKAGE

TYPICAL CHARACTERISTICS
Ambient Temperature( C )
RECOMMENDED REFLOW SOLDERING PROFILE
250
Peak .Temp 260℃
1 0 Sec Max
22 0 ℃
200
90 Sec Max
( >220℃)
150
100
50
0
PIN CONNECTIONS
Time (s ec.)
Pin
1 2 3 5 6 7 8 9 10 12 13 14
Function GND Vin NC NC 0V + Vo N C NC NC NC NC NC
OUTLINE DIMENSIONS& RECONMENDED FOOTPRINT DETAILS
A
1.27
(0.05)
2.54±0.1
(0.1±0.004)
0.25
(0.01)
141312 10 9 8
123 5 67
15.24 ^(0.6)
17.78 (0.7)
1.30±0.13
(0. 05±0.005)
。
5.00 MAX
Note: All Pins on a 2.54mm(0.1) pitch; All Pin Widths are 0.60 mm(0.02);
Tolerances:±0.15mm(0.006); Unit: mm(inch).
APPLICATION NOTE
Filtering
In some circuits which are sensitive to
noise and ripple, a filtering capacitor may
be added to the DC/DC output end and
input end to reduce the noise and ripple.
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 the external capacitor
table. To get an extremely low ripple, an
“LC” filtering network may be connected to
the input and output ends of the DC/DC
converter, which may produce a more
significant filtering effect. 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
(Figure 1).
L
Vin
L
+ Vo
C
DC DC
C
G ND
0V
（Figure 1）
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).
Vin
GND
REG
DC DC
+Vout
0V
Vin
GND
REG
DC DC
+Vout
0V
(Figure2)
Overload Protection
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.
EXTERNAL CAPACITOR TABLE
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 (B_T-1W series).
Vin
5VDC
12VDC
--
--
External
capacitor
4.7uF
2.2uF
--
--
Vout
5VDC
9VDC
12VDC
15VDC
External
capacitor
4.7uF
2.2uF
1uF
0.47uF
It’s not recommend to connect any
external capacitor in the application
field with less than 0.5 watt output。
MORNSUN reserves the copyright For any design change and upgrade, we will not make any prior notification A/1-2007 Page 2 of 2