B-XT-1W

B-XT-1W Series
1W, FIXED INPUT, ISOLATED SINGLE OUTPUT SMD DC
DC--DC CONVERTER
SELECTION GUIDE
Input
Output
Isolation
Efficiency
MTTF1
Order code
Voltage(VDC)
Current (mA)
Voltage
Current
Nominal
Rated Load
(VDC)
(mA)
B0303XT-1W
3.3
410
3.3
303
B0305XT-1W
3.3
390
5
B0309XT-1W
3.3
400
Short Circuit Protection(automatic recovery)
B0312XT-1W
3.3
400
I/O isolation voltage 1000VDC
B0315XT-1W
3.3
400
Operating Temperature: -40℃~﹢85℃
B0503XT-1W
5
270
Capacitance
(%.Typ.)
FEATURES
Footprint over pins 1.37cm2
pF
KHrs
81
29
5348
200
83
30
3847
9
111
74
34
3134
12
83
76
40
3473
15
66
81
42
2473
3.3
303
85
31
5515
◆
◆
◆
◆
B0505XT-1W
5
294
5
200
83
33
6857
B0505NXT-1W
5
260
5
200
86
42
3933
Toroidal magnetics
B0506XT-1W
5
278
6
167
83
43
6677
Small SMD package with footprint
B0509XT-1W
5
267
9
111
85
38
5501
B0512XT-1W
83
74
44
3957
High efficiency up to 78%
◆
◆
◆
5
260
12
B0515XT-1W
5
256
15
66
78
43
2747
B1205XT-1W
12
124
5
200
80
50
4683
Multi-layer ceramic capacitors
B1209XT-1W
12
114
9
111
80
72
4008
Custom solutions available
B1212XT-1W
12
113
12
83
85
89
3121
B1215XT-1W
12
111
15
66
81
100
2316
Power density 1.8W/cm3
◆
Lead frame technology
◆
◆
◆
MODEL SELECTION
1. Calculated using MIL-HDBK-217FN2 with nominal input voltage at full load.
All specifications typical at TA=25℃, nominal input voltage and rated output current unless otherwise specified.
B①05②05③X④ T⑤-1W⑥
①Product Series
③Output Voltage
⑤SMD Package
②Input Voltage
④Fixed Input
⑥Rated Power
Input Characteristics
Parameter
Voltage range
APPLICATIONS
The B-XT-1W series are miniature,1W DC/DC
converters with high isolation in a SMD package.
With a new package design these converters are
qualified for the higher temperatures requested
by lead-free reflow solder processes. With the
small footprint, these converters are the ideal
solution for board level power distribution,mainly
for applications in the industrial and telecom field.
For automated SMD production lines the devices
can be supplied in standard tape and reel
package.
Conditions
Min.
Typ.
Max.
Units
Continuous operation, 3.3V input
2.97
3.3
3.63
VDC
Continuous operation, 5V input
4.5
5
5.5
VDC
Continuous operation, 12V input
10.8
12
13.2
VDC
30
47
mA p-p
Typ.
Max.
Units
Start up time
Isolation Characteristics
Parameter
Conditions
Min.
Isolation voltage
Flash tested for 1 second
1000
VDC
Resistance
Viso= 1000VDC
10
GΩ
General Characteristics
Parameter
Conditions
Switching frequency
All output types
Min.
Typ.
Max.
110
Units
kHz
Absolute Maximum Ratings
Parameter
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Conditions
Lead temperature 1.5mm from case for 10 seconds
300℃
Internal power dissipation
600mW
Input voltage V , B03 types
5.5V
Input voltage Vin, B05 types
7V
Input voltage Vin, B12 types
15V
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Page 1 of 6
B-XT-1W Series
Output Specifications
Parameter
Conditions
Min.
Rated Power
TA=-40°C to 85°C
0.1
Voltage Set Point
See tolerance envelope
Line regulation
Load
Typ.
Max.
Units
1.0
W
High VIN to low VIN
1.0
1.2
%%
10% load to rated load, 0303& 0503
10
14
%
10% load to rated load, 0505& 1205
12.8
15
%
10% load to rated load, 0506
9.2
10
%
10% load to rated load, 0509 & 1209
8.3
9.0
%
10% load to rated load, 0512& 1212
6.8
7.5
%
10% load to rated load, 0515& 1215
6.3
7.0
%
BW=DC to 20MHz, 3.3V output types, 0305 & 0505
40
60
mV p-p
regulation1
BW=DC to 20MHz, 3.3V output types,0505 & 1205
62
85
mV p-p
BW=DC to 20MHz, 0506
103
170
mV p-p
BW=DC to 20MHz, 0509& 1209
49
75
mV p-p
BW=DC to 20MHz, 0512& 1212
39
65
mV p-p
BW=DC to 20MHz, 0515& 1215
38
76
mV p-p
Typ.
Max.
Units
Ripple&Noise
Note:1、12V input types have typically 3% less load regulation change.
Temperature Characteristics
Parameter
Conditions
Min.
Specification
All output types
-40
85
℃
-55
125
℃
Storage
Case temperature
rise above ambient
Cooling
0305, 0309, 0315
25
℃
0303, 0312, 0503, 0505, 0509, 0512C, 0515
30
℃
0505, 1205
43
℃
1209, 1212, 1215
40
℃
Free air convection
Technical notes
ISOLATION VOLTAGE
‘Hi Pot Test’
、“Flash Tested’、”Withstand Voltage“、‘Proof Voltage”
、
“Dielectric Withstand Voltage'&'Isolation Test Voltage”are all terms that relate to the same thing, a test voltage, applied for a specified time,
across a component designed to provide electrical isolation, to verify the integrity of that isolation.
Professional Power Module B-XT-1W series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1kVDC for 1 second.
A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”
For a part holding no specific agency approvals, such as the B-XT-1W series, both input and output should normally be maintained within SELV limits i.e. less than 42.4V peak, or 60VDC. The isolation test voltage
represents a measure of immunity to transient voltages and the part should never be used as an element of a safety isolation system. The part could be expected to function correctly with several hundred volts
offset applied continuously across the isolation barrier; but then the circuitry on both sides of the barrier must be regarded as operating at an unsafe voltage and further isolation/insulation systems must form a
barrier between these circuits and any user-accessible circuitry according to safety standard requirements.
REPEATED HIGH-VOLTAGE ISOLATION TESTING
It is well known that repeated high-voltage isolation testing of a barrier component can actually degrade isolation capability, to a lesser or greater degree depending on materials, construction and environment. The
B-XT-1W series has toroidal isolation transformers, with no additional insulation between primary and secondary windings of enameled wire. While parts can be expected to withstand several times the stated
test voltage, the isolation capability does depend on the wire insulation. Any material, including this enamel (typically polyurethane) is susceptible to eventual chemical degradation when subject to very high
applied voltages thus implying that the number of tests should be strictly limited. We therefore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be
reduced by 20% from specified test voltage.
This consideration equally applies to agency recognized parts rated for better than functional isolation where the wire enamel insulation is always supplemented by a further
insulation system of physical spacing or barriers.
Temperature derating graph
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Page 2 of 6
B-XT-1W Series
Application Notes
Minimum load
The minimum load to meet datasheet specification is 10% of the full rated load across the specified input voltage range. Lower than 10% minimum loading will result in an
increase in output voltage, which may rise to typically double the specified output voltage if the output load falls to less than 5%.
Capacitive loading and start up
Typical start up times for this series, with a typical input voltage rise time of 2.2μs and output capacitance of 10μF, are shown in the table below. The product series will start
into a capacitance of 47μF with an increased start time, however, the maximum recommended output capacitance is 10μF.
Start-up time
Start-up time
μs
μs
B0303XT
437
B0506XT
7200
B0305XT
1359
B0509XT
3146
B0309XT
3435
B0512XT
4960
B0312XT
6590
B0515XT
7740
B0315XT
7625
B1205XT
895
B0503XT
533
B1209XT
2150
B0505XT
1368
B1212XT
3640
B0505NXT
721
B1215XT
7180
Ripple & Noise Characterization Method
Ripple and noise measurements are performed with the following test configuration.
C1
1μF X7R multilayer ceramic capacitor, voltage rating to be a minimum of 3 times the output voltage of the DC/DC converter
C2
10μF tantalum capacitor, voltage rating to be a minimum of 1.5 times the output voltage of the DC/DC converter with an ESR of less
than 100mΩ at 100 kHz
C3
100nF multilayer ceramic capacitor, general purpose
R1
450Ω resistor, carbon fi lm, ±1% tolerance
R2
50Ω BNC termination
T1
3T of the coax cable through a ferrite toroid
RLOAD
Resistive load to the maximum power rating of the DC/DC converter. Connections should be made via twisted wires
Measured values are multiplied by 10 to obtain the specified values.
Differential Mode Noise Test Schematic
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Page 3 of 6
B-XT-1W Series
Application Notes
Output Ripple Reduction
By using the values of inductance and capacitance stated, the output ripple at the rated load is lowered to 5mV p-p max.
Component selection
Capacitor: It is required that the ESR (Equivalent Series Resistance) should be as low as possible, ceramic types are recommended.
The voltage rating should be at least twice (except for 15V output), the rated output voltage of the DC/DC converter.
Inductor: The rated current of the inductor should not be less than that of the output of the DC/DC converter. At the rated current, the DC resistance of the inductor should be
such that the voltage drop across the inductor is <2% of the rated voltage of the DC/DC converter. The SRF (Self Resonant Frequency) should be >20MHz.
Inductor
Capacitor
L,μH
SMD
Through Hole
C,μF
B0303XT
10
82103C
11R103C
4.7
B0305XT
47
82473C
11R103C
4.7
B0309XT
22
82223C
11R223C
2.2
B0312XT
10
82103C
11R103C
1
B0315XT
47
82473C
11R473C
1
B0503XT
10
82103C
11R103C
4.7
B0505XT
47
82473C
11R473C
4.7
B0505NXT
47
82473C
11R473C
4.7
B0506XT
10
82103C
11R103C
4.7
B0509XT
22
82223C
11R223C
2.2
B0512XT
47
82473C
11R473C
1
B0515XT
47
82473C
11R473C
1
B1205XT
47
82473C
11R473C
4.7
B1209XT
22
82223C
11R223C
2.2
B1212XT
47
82473C
11R473C
1
B1215XT
47
82473C
11R473C
1
Tolerance Envelopes
The voltage tolerance envelope shows typical load regulation characteristics for this product series. The tolerance envelope is the maximum output voltage variation due to
changes in output loading.
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Page 4 of 6
B-XT-1W Series
OUTLINE DIMENSIONS & FOOTPRINT DETAILS
SOLDER PAD DIMENSION
MECHANICAL DIMENSIONS
Note:
Unit:mm[inch]
Pin section tolerances:±0.10mm[±0.004inch]
General tolerances:±0.25mm[±0.010inch]
Weight: 1.21g
FOOTPRINT DETAILS
Pin
Single
1
-Vin
3
+Vin
5
NA
7
-Vout
8
+Vout
10
NA
12
NA
14
NA
Dimensions in [mm], () = Inch
Pin pitch tolerances: ±0.13 (±0.005)
Other tolerances: ±0.25 (±0.01)
TUBE OUTLINE DIMENSIONS
NA - Not available for electrical connection.
Unless otherwise stated all dimensions in mm±0.5 (inches ±0.02).
Tube length : 475±2.0 (18.70±0.07).
Tube Quantity :35
Specifcations can be changed any time without notice.
No parallel connection or plug and play.
Note:
1. The load shouldn't be less than 10%, otherwise ripple will increase dramatically.
2. Operation under 10% load will not damage the converter; However, they may not meet all specification listed.
3. All specifications measured at Ta=25°C, humidity<75%, nominal input voltage and rated output load unless otherwise specified.
4. In this datasheet, all the test methods of indications are based on corporate standards.
5. Only typical models listed, other models may be different, please contact our technical person for more details.
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Technical Enquiries-Email:tech@microdc.cn Tel:0086-20-86000646
Page 5 of 6
B-XT-1W Series
Tape & Reel Specifications
Reel Packaging Details
Product Orientation
Pin 1, located nearest to carrier drive sprocket.
Reel Quantity : 500
Reel Outline Dimensions
Tape Outline Dimensions
RoHS COMPLIANT INFORMATION
Microdc Professional Power Module,Inc.
This series is compatible with RoHS soldering systems with a peak wave solder temperature of 300°C
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for 10 seconds. The pin termination finish on the SIP package type is Tin Plate, Hot Dipped over Matte
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Tin with Nickel Preplate. The DIP types are Matte Tin over Nickel Preplate. Both types in this series are
Microdc Professional Power module,Inc.makes no representation that
backward compatible with Sn/Pb soldering systems.
the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or
REACH COMPLIANT INFORMATION
future patent rights. Specifications are subject to change without notice.
This series has proven that this product does not contain harmful chemicals, it also has harmful chemical
©2010
substances through the registration, inspection and approval.
Microdc Professional Power Module, Inc. Guangzhou
http://www.microdc.cn
Technical Enquiries-Email:tech@microdc.cn Tel:0086-20-86000646
Page 6 of 6