B

-XT

Series

Series

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Technical Enquiries-Email:tech@microdc.cn Tel:0086-20-86000646

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Output

Specifications

Parameter

Conditions

Min.

Typ.

Max.

Units

Rated Power

TA=-40°C to 85°C

0.1

1.0

W

Voltage Set Point

See tolerance envelope

Line regulation

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

%

Ripple＆Noise

BW=DC to 20MHz, 3.3V output types, 0305 & 0505

40

60

mV p-p

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

Note:1、12V input types have typically 3% less load regulation change.

Temperature

Characteristics

Parameter

Conditions

Min.

Typ.

Max.

Units

Specification

All output types

-40

85

℃

Storage

-55

125

℃

Case temperature

rise above ambient

0305, 0309, 0315

25

℃

0303, 0312, 0503, 0505, 0509, 0512C, 0515

30

℃

0505, 1205

43

℃

1209, 1212, 1215

40

℃

Cooling

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 speci

fied time, across a component designed to provide electrical isolation, to verify the integrity of that isolation.

Professional Power Module B-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 B-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

B-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

graph