DC/DC Converter
B_XT-W2R2 Series
0.25W, Fixed input voltage, isolated & unregulated
single output
FEATURES
Continuous short circuit protection
Efficiency up to 79%
Operating temperature range: -40℃ to +105℃
Isolation voltage: 1.5K VDC
Ultra-Low ripple & noise
Miniature SMD package
Internal surface mounted design
International standard pin-out
Patent Protection
RoHS
B_XT-W2R2 series is specially designed for applications where an isolated voltage is required in a distributed power supply system. It is
suitable for
1.Where the voltage of the input power supply is stable (voltage variation: ±10%Vin);
2.Where isolation is necessary between input and output (isolation voltage
≤1500VDC);
3.Where do not has high requirement of line regulation , load regulation and the ripple & noise of the output voltage;
Such as: pure digital circuits, low frequency analog circuits, and relay-driven circuits.
Selection Guide
Input Voltage (VDC)
Part No.
B0503XT-W2R2
B0505XT-W2R2
B1205XT- W2R2
B1212XT- W2R2
B2405XT- W2R2
Nominal
(Range)
5
(4.5-5.5)
12
(10.8-13.2)
24
(21.6-26.4)
Output Voltage
(VDC)
3.3
5
5
12
5
Output
Output Current (mA)
(Max./Min.)
76/8
50/5
50/5
21/2
50/5
Efficiency
(%,
Min./T
yp.)
@ Full Load
69/74
74/79
74/79
74/79
66/71
220
Max. Capacitive
Load
(μF)
Input Specifications
Item
Input Current (full load / no-load)
Operating Conditions
5V input
12V input
24V input
5V input
Surge Voltage (1sec. max.)
12V input
24V input
Reflected Ripple Current
Input Filter
5V input
12V/24V input
Min.
--
--
--
-0.7
-0.7
-0.7
--
--
Typ.
68/15
27/10
15/8
--
--
--
20
5
Max.
--
--
--
9
18
30
--
--
mA
VDC
mA
Unit
Capacitor filter
Output Specifications
Item
Output Voltage Accuracy
Line Regulation
Input voltage change:
±1%
3.3V output
5V/12V output
3.3V output
Load Regulation
Ripple & Noise*
Temperature Drift Coefficient
Output Short Circuit Protection
10%-100% load
20MHz bandwidth
100% load
5V output
12V output
--
--
--
--
--
--
--
Operating Conditions
Min.
Typ.
--
--
15
12
7
10&20
--
Max.
±1.5
±1.2
20
15
10
--
±0.03
mVp-p
%/℃
%
Unit
See tolerance envelope graph (Fig. 1)
--
Continuous, self-recovery
Note: * Ripple and noise tested with “parallel cable” method, please see
DC-DC Converter Application Notes
for specific operation methods.
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DC/DC Converter
B_XT-W2R2 Series
General Specifications
Item
Isolation Voltage
Isolation Resistance
Isolation Capacitance
Operating Temperature
Storage Temperature
Casing Temperature Rise
Pin Welding Resistance Temperature
Reflow Soldering Temperature
Storage Humidity
Switching Frequency
MTBF
Non-condensing
100% load, nominal input voltage
MIL-HDFK-217F@25℃
Ta=25℃
Welding spot is 1.5mm away from the casing, 10 seconds
Operating Conditions
Input-output, with the test time of 1 minute and the leak
current lower than 1mA
Input-output, Isolation voltage 500VDC
Input-output, 100KHz/0.1V
Derating if the temperature
≥100℃
(see Fig. 2)
Min.
1500
1000
--
-40
-55
--
--
Typ.
--
--
20
--
--
15
--
Max.
--
--
--
105
125
--
300
℃
Unit
VDC
MΩ
pF
Peak temp.≤245℃, maximum duration
time≤60s at 217℃.
For actual application, please refer to
IPC/JEDEC J-STD-020D.1.
--
--
3500
--
100
--
95
300
--
%
KHz
K hours
Physical Specifications
Casing Material
Package Dimensions
Weight
Cooling Method
Black flame-retardant heat-proof epoxy resin (UL94-V0)
12.70*11.20*7.25 mm
1.5 g (Typ.)
Free air convection
EMC Specifications
EMI
EMS
Conducted disturbance
Radiated emission
Electrostatic discharge
CISPR22/EN55022
CISPR22/EN55022
IEC/EN61000-4-2
CLASS B (see Fig. 5 for recommended circuit)
CLASS B (see Fig. 5 for recommended circuit)
Contact ±6KV
perf. Criteria B
Product Characteristic Curve
+10%
+5%
Rated
Output Voltage
Output Voltage
Accuracy
(%)
Tolerance Envelope Graph
Output Power Per cent(%)
Ty p ic a
Temperature Derating C urve
120
100
80
60
40
20
0
-40
40
100 105
0
En vi ron ment Temp.(
℃
)
Safe Operati ng Area
l L o ad
Curve
+2.5%
-2.5%
-7.5%
50
70
100
Output Current Percentage(%)
(Nominal Input Voltage)
Fig. 1
100
95
90
Fig. 2
100
90
Efficiency Vs Input Voltage (Full Load)
Efficiency Vs Output Load(Vin=5V)
Efficiency(%)
Efficiency(%)
85
80
75
70
65
60
55
50
4.6
4.7
4.8
4.9
5
5.1
5.2
5.3
5.4
5.5
80
70
60
50
40
30
20
10
20
30
40
50
60
70
80
90
100
B0505XT-W2R2
B0505XT-W2R2
Input Voltage(V)
Output Current Percentage (%)
2014.05.22-A/1
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DC/DC Converter
B_XT-W2R2 Series
100
95
90
Efficiency Vs Input Voltage (Full Load)
100
90
B1205XT-W2R2
Efficiency Vs Output Load(Vin=12V)
Efficiency(%)
80
75
70
65
60
55
50
11.0 11.4 11.6 11.8 12.0 12.2 12.4 12.6 12.8 13.2
Efficiency(%)
85
80
70
60
50
40
30
20
10
20
30
40
50
60
70
80
90
100
B1205XT-W2R2
Input Voltage(V)
Output Current Percentage (%)
Design Reference
1. Typical application
If it is required to further reduce input and output ripple, a filter capacitor can be connected to the input and output terminals, see Fig.3.
Moreover, choosing suitable filter capacitor is very important, start-up problems may be caused by too large capacitance. To ensured the
modules running well, the recommended capacitive load values as shown in Table 1.
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 (see Fig. 4).
Vin
C in
GND
+Vo
Vin
GND
REG
REG
+Vo
DC
DC
C out
0V
DC DC
0V
Fig.4
Fig.3
Recommended capacitive load value table (Table 1)
Vin(VDC)
5
12
24
Cin(μF)
4.7
2.2
1
Vo (VDC)
3.3/5
12
--
Cout(μF)
10
2.2
--
2. EMC typical recommended circuit
LDM
Vin
C1
GND
Vin
+Vo
C2
LOAD
Input voltage (VDC)
C1
EMI
C2
LDM
5/12/24
4.7μF /50V
Refer to the Cout in Fig.3
6.8μH
DC/DC
GND
0V
Fig. 5
3. Output load requirements
To ensure the module work efficiently and reliably, during the operation, the min. output load should be no less than 10% of the full load. If
the actual output power is low, please connect a resister to the output terminal in parallel, with a recommenced resistance which is 10% of
the rated power, and derating is required during operation.
4. For more information please find the application notes on www.mornsun-power.com
2014.05.22-A/1
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DC/DC Converter
B_XT-W2R2 Series
Dimensions and Recommended Layout
Notes:
1.
2.
3.
4.
5.
6.
7.
8.
Packing Information please refer to 'Product Packing Information'. Packing bag number: 58210023;
If the product is operated under the min. required load, the product performance cannot be guaranteed to comply with all
performance indexes in this datasheet;
The max. capacitive load should be tested within the input voltage range and under full load conditions;
Unless otherwise specified, data in this datasheet should be tested under the conditions of Ta=25°C, humidity<75% when inputting
nominal voltage and outputting rated load;
All index testing methods in this datasheet are based on our Company’s corporate standards;
The performance indexes of the product models listed in this manual are as above, but some indexes of non-standard model products
will exceed the above-mentioned requirements, and please directly contact our technicians for specific information;
We can provide product customization service;
Specifications of this product are subject to changes without prior notice.
MORNSUN Guangzhou Science & Technology Co., Ltd.
Address: No. 5, Kehui St. 1, Kehui Development Center, Science Ave., Guangzhou Science City, Luogang District, Guangzhou, P. R. China
Tel: 86-20-38601850-8801
Fax: 86-20-38601272
E-mail:
info@mornsun.cn
2014.05.22-A/1
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