A-XT

A-XT Series
1W, FIXED INPUT, ISOLATED DUAL OUTPUT SMD DC-DC CONVERTER
SELECTION GUIDE
1. Calculated using MIL-HDBK-217F with nominal input voltage at full load.
All specifications typical at TA=25℃,
and rated output Efficiency
current unless otherwise
Input nominal input voltageOutput
Isolation specified.
MTTF1
Voltage(VDC)
Capacitance
Order code
Current (mA)
Voltage
Current
(%.Typ.)
(VDC)
Nominal
(mA)
Rated Load
pF
KHrs
FEATURES
A0303XT
3.3
402
±3.3
±152
81
29
1005
A0305XT
3.3
388
±5
±100
83
30
399
A0309XT
3.3
405
±9
±55
74
34
827
A0312XT
3.3
390
±12
±42
76
40
375
A0315XT
3.3
392
±15
±33
81
42
206
◆
Footprint over pins 1.64cm2
◆
Short Circuit Protection(automatic recovery)
◆
I/O isolation voltage 1000VDC
A0503XT
5
259
±3.3
±152
85
31
964
Operating Temperature: -40℃～﹢85℃
A0505XT
5
290
±5
±100
83
33
1697
A0505NXT
5
251
±5
±100
86
42
367
A0509XT
5
267
±9
±55
85
38
682
±42
74
44
343
◆
◆
High efficiency up to 78%
◆
Toroidal magnetics
A0512XT
5
260
±12
◆
Small SMD package with footprint
A0515XT
5
256
±15
±33
78
43
188
A1205XT
12
121
±5
±100
80
50
559
A1209XT
12
113
±9
±55
80
72
375
A1212XT
12
111
±12
±42
85
89
243
A1215XT
12
110
±15
±33
81
100
154
◆
◆
◆
3
Power density 1.36W/cm
Lead frame technology
Multi-layer ceramic capacitors
Custom solutions available
◆
Input Characteristics
MODEL SELECTION
Parameter
A①05②05③X④ T⑤
①Product Series
③Output Voltage
⑤SMD Package
②Input Voltage
④Fixed Input
Voltage range
Conditions
Min.
Typ.
Max.
Units
Continuous operation, 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
41
50
mA p-p
Typ.
Max.
Units
Start up time
Isolation Characteristics
APPLICATIONS
The A-XT 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.
Parameter
Conditions
Min.
Isolation voltage
Flash tested for 1 second
1000
VDC
Resistance
Viso= 1000VDC
10
GΩ
General Characteristics
Parameter
Conditions
Min.
Typ.
Max.
Units
0312, 0315
100
kHz
Switching frequency
0303, 0305, 0503, 0505
110
kHz
All other variants
115
kHz
Absolute Maximum Ratings
Parameter
MICRODC R ESERVES THE COPYRIGHT
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Conditions
Lead temperature 1.5mm from case for 10 seconds
300℃
Internal power dissipation
700mW
Input voltage V , A03 types
5.5V
Input voltage Vin, A05 types
7V
Input voltage Vin, A12 types
15V
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Page 1 of 6
A-XT Series
Output Specifications
Parameter
Conditions
Max.
Units
1.0
W
1.0
1.2
%%
10
15
%
10% load to rated load, 5V output types
10
12
%
10% load to rated load, 0309
9.0
10
%
10% load to rated load, 0509 & 1209
6.5
8.0
%
10% load to rated load, 0312 & 0315
11
14
%
10% load to rated load, 0512 & 1212
6.0
8.5
%
10% load to rated load, 0515 & 1215
6.0
7.0
%
BW=DC to 20MHz, 3.3V output types, A0305 & A0505
40
80
mV p-p
BW=DC to 20MHz, all other 5V output types
50
100
mV p-p
BW=DC to 20MHz, 9V output types
35
80
mV p-p
BW=DC to 20MHz, 12V output types
50
110
mV p-p
BW=DC to 20MHz, 15V output types
65
110
mV p-p
Typ.
Rated Power
TA=-40°C to 85°C
Voltage Set Point
See tolerance envelope
Line regulation
High VIN to low VIN
10% load to rated load, 0303& 0503
Load regulation1
Ripple＆Noise
Min.
Typ.
0.1
Note:1、12V input types have typically 3% less load regulation change.
Temperature Characteristics
Parameter
Specification
Conditions
All output types
Storage
Case temperature rise
Min.
Max.
Units
-40
85
℃
-55
125
℃
0305, 0505, 0312, 0315
19
℃
0303, 0309, 0503
25
℃
0505, 1205
46
℃
ambient
All other variants
35
℃
Cooling
Free air convection
above
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 A-XT 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 A-XT 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
A-XT 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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A-XT 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
A0303XT
1630
A0509XT
6850
A0305XT
1359
A0512XT
11560
A0309XT
3435
A0515XT
15640
A0312XT
6590
A1205XT
1154
A0315XT
25340
A1209XT
4050
A0503XT
1599
A1212XT
7995
A0505XT
2185
A1215XT
11200
A0305NXT
1395
Ripple & Noise Characterisation 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
A-XT 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
A0303XT
10
82103C
11R103C
4.7
A0305XT
22
82223C
11R223C
2.2
A0309XT
22
82223C
11R223C
2.2
A0312XT
47
82473C
11R473C
1
A0315XT
220
82474C
11R474C
0.22
A0503XT
10
82103C
11R103C
4.7
A0505XT
10
82103C
11R103C
4.7
A0305NXT
10
82103C
11R103C
4.7
A0509XT
22
82223C
11R103C
2.2
A0512XT
47
82473C
11R223C
1
A0515XT
220
82474C
11R473C
0.22
A1205XT
10
82103C
11R474C
4.7
A1209XT
22
82223C
11R223C
2.2
A1212XT
47
82473C
11R473C
1
A1215XT
220
82474C
11R474C
0.22
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
A-XT Series
OUTLINE DIMENSIONS ＆ FOOTPRINT DETAILS
MECHANICAL DIMENSIONS
Note:
Unit:mm[inch]
Pin section tolerances:±0.10mm[±0.004inch]
General tolerances:±0.25mm[±0.010inch]
SOLDER PAD DIMENSION
Weight: 1.53g
FOOTPRINT DETAILS
Pin
Dual
1
-Vin
3
+Vin
5
NA
7
0V
9
-Vout
10
NA
12
+Vout
14
NA
16
NA
18
NA
NA - Not available for electrical connection.
Dimensions in [mm], () = Inch
Pin pitch tolerances: ±0.13 (±0.005)
Other tolerances: ±0.25 (±0.01)
TUBE OUTLINE DIMENSIONS
Unless otherwise stated all dimensions in mm±0.5 (inches ±0.02).
Tube length : 475±2.0 (18.70±0.07).
Tube Quantity :25
Specifications 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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Page 5 of 6
A-XT 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:[email protected] Tel:0086-20-86000646
Page 6 of 6