B-XM-2W Series

Isolated 2W Single Output DC/DC Converters

FEATURES

Footprint from 1.05cm²
I/O isolation voltage 1000VDC
Operating Temperature: -40°C ~ +85°C
High efficiency up to 85%
Fully encapsulated toroidal magnetics
Internal SMD construction
Custom solutions available
No electrolytic or tantalum capacitors
5V,9V,12V and 15V output
No heatsink required
Pin compatible with B-X(S)D-1W series
UL 94V-0 package material
No external components required
Industry standard pinout
Power density 2.01W/cm³
MTTF up to 2.3 million hours

SELECTION GUIDE

Order code	Input Voltage (V)	Output Voltage (V)	Output Current (MA)	Input Current (Rated Load) (MA)	Efficiency (%)	Isolation Capacitance (PF)	MTTF¹ (KHRS)
B0505XM-2W	5	5	400	513	78	19	2327
B0509XM-2W	5	9	222	492	81	27	1393
B0512XM-2W	5	12	167	479	84	32	832
B0515XM-2W	5	15	133	481	83	27	481
B1205XM-2W	12	5	400	207	81	28	716
B1209XM-2W	12	9	222	198	84	42	593
B1212XM-2W	12	12	167	197	85	46	461
B1215XM-2W	12	15	133	197	85	54	328
B2405XM-2W	24	5	400	104	80	60	315
B2409XM-2W	24	9	222	100	83	65	302
B2412XM-2W	24	12	167	99	84	78	295
B2415XM-2W	24	15	133	99	84	58	282

Input Characteristics

Parameter	Conditions	Min	Typ	Max.	Units
Voltage range	Continuous operation,5V input types	4.5	5	5.5	V
	Continuous operation,12V input types	10.8	12	13.2	V
	Continuous operation,24V input types	21.6	24	26.4	V
Reflected ripple current	5V input types		33		mA p-p
Reflected ripple current	12V input types		38		mA p-p

OUTPUT CHARACTERISTICS

Parameter	Conditions	Typ.	Max.	Units
Rated Power	TA=-40°C to 85°C		2	W
Voltage Set Point Accuracy	See tolerance envelope
Line regulation	High VIN to low VIN	1.0	1.2	%
Load regulation 10% load to rated load	5V output	7	8.5	%
	9V output	4.5	5.2	%
	12V output	4.5	5.5	%
	15V output	3.7	8.5	%
Ripple and Noise	B0505XM,BW=DC to 20MHz	96	200	mA p-p
	B0509XM,BW=DC to 20MHz	67	200	mA p-p
	B0512XM,BW=DC to 20MHz	59	200	mA p-p
	B0515XM,BW=DC to 20MHz	53	200	mA p-p
	B1205XM,BW=DC to 20MHz	76	200	mA p-p
	B1209XM,BW=DC to 20MHz	63	200	mA p-p
	B1212XM,BW=DC to 20MHz	53	200	mA p-p
	B1215XM,BW=DC to 20MHz	45	200	mA p-p

Absolute Maximum Ratings

Parameter	Value
Short-circuit protection²	1 second
Lead temperature 1.5mm from case for 10 seconds	300°C
Internal power dissipation	805mW
Input voltage VIN,B05 types	7V
Input voltage VIN,B12 types	15V
Input voltage VIN,B24 types	28V

Isolation characteristics

Parameter	Conditions	Min.	Typ	Max.	Unit
Isolation test voltage	1 second	1000			VDC
Resistance	Viso= 500VDC	10			GΩ

1.Calculated using MIL-HDBK-217FN2 calculation model with nominal input voltage at full load.
2.Supply voltage must be disconnected at the end of the short circuit duration.
All specifications typical at TA=25°C,nominal input voltage and rated output current unless otherwise specified.

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 2.2s and output capacitance of 10F, are shown in the table below. The product series will start into a capacitance of 47F with an increased start time, however, the maximum recommended output capacitance is 10F.

Model	Start-up time (μs)
B0505XM	790
B0509XM	1154
B0512XM	2265
B0515XM	2998
B1205XM	396
B1209XM	880
B1212XM	1156
B1215XM	2394

General Characteristics

Parameter	Conditions	Min.	Typ.	Max.	Units
Switching frequency	5V input types		90		kHz
Switching frequency	12V input types		90		kHz

Temperature Characteristics

Parameter	Conditions	Min.	Max.	Units
Specification	All output types	-40	85	°C
Storage		-50	130	°C
Case temperature above ambient	5V output types		45	°C
Case temperature above ambient	All other output types		36	°C
Cooling	Free air convection

Technical notes

ISOLATION VOLTAGE
"Hi Pot Test","Flash Tested","Withstand 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-XM series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1KVDC for 1 second.

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-XM 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.

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: Ceramic chip capacitors are recommended. It is required that the ESR(Equivalent Series Resistance)should be as low as possible.X7R 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 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.

CHARACTERISATION TEST METHODS

Ripple and noise measurements are performed with the following test configuration.

Item	Description
C1	1 μ F X7R multilayer ceramic capacitor, voltage rating to be a minimum of 3 times the output voltage of the DC/DC converter
C2	10 μ F 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 100m Ω at 100 KHz
C3	100nF multilayer ceramic capacitor, general purpose
R1	450 Ω resistor, carbon film, ±1% tolerance
R2	50 Ω 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.

PACKAGE SPECIFICATIONS

SIP Package

PIN CONNECTIONS-4 PIN SIP

PIN	Function	"N"SUFFIX
1	-Vin	+Vin
2	+Vin	-Vin
3	-Vout	-Vout
4	+Vout	+Vout

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.

B1212XM-2W