WRA-YLS-3W

WRA-YLS-3W

WRA-YLS-3W

WRA-YLS-3W

WRA-YLS-3W

WRA-YLS-3W

WRA-YLS-3W

Series

http://www.microdc.cn

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

Page 2 of 4

TEMPERATURE

TEMPERATURE

TEMPERATURE

TEMPERATURE

TEMPERATURE

TEMPERATURE

TEMPERATURE

CHARACTERISTICS

CHARACTERISTICS

CHARACTERISTICS

CHARACTERISTICS

CHARACTERISTICS

CHARACTERISTICS

CHARACTERISTICS

Parameter

Parameter

Parameter

Parameter

Conditions

Conditions

Conditions

Conditions

MIN.

MIN.

MIN.

MIN.

TYP.

TYP.

TYP.

TYP.

MAX.

MAX.

MAX.

MAX.

Units

Specifcation

-40

85

°C

Operation

-40

100

Storage

-50

130

Case temperature rise above ambient

12V & 15V output types @ 100% load

36

MTTF

MTTF

MTTF

MTTF

MTTF

MTTF

MTTF

(MEAN

(MEAN

(MEAN

(MEAN

(MEAN

(MEAN

TIME

TIME

TIME

TIME

TIME

TIME

TO

TO

TO

TO

TO

TO

FAILURE)

FAILURE)

FAILURE)

FAILURE)

FAILURE)

FAILURE)

FAILURE)

Part

Part

Part

Part Number

Number

Number

Number

MTTF

MTTF

MTTF

MTTF

Units

Units

Units

Units

Conditions

WRA2412YLS-3W

2077

kHrs

Calculated using MIL-HDBK 217F with

Nominal input at full voltage (ground

benign) at 25°C.

WRA2415YLS-3W

2080

WRA4812YLS-3W

2090

WRA4815YLS-3W

2045

GENERAL

GENERAL

GENERAL

GENERAL

GENERAL

GENERAL

GENERAL

CHARACTERISTICS

CHARACTERISTICS

CHARACTERISTICS

CHARACTERISTICS

CHARACTERISTICS

CHARACTERISTICS

CHARACTERISTICS

Parameter

Parameter

Parameter

Parameter

Conditions

Conditions

Conditions

Conditions

MIN.

MIN.

MIN.

MIN.

TYP.

TYP.

TYP.

TYP.

MAX.

MAX.

MAX.

MAX.

Units

Control pin (CTRL) input current

Please refer to control pin application note

6

15

mA

Switching frequency

Load causing lowest frequencies, 100% load VIN MIN.

100

125

150

kHz

Load causing highest frequencies, 25% load VIN MAX.

300

400

500

ISOLATION

ISOLATION

ISOLATION

ISOLATION

ISOLATION

ISOLATION

ISOLATION

CHARACTERISTICS

CHARACTERISTICS

CHARACTERISTICS

CHARACTERISTICS

CHARACTERISTICS

CHARACTERISTICS

CHARACTERISTICS

Parameter

Parameter

Parameter

Parameter

Conditions

Conditions

Conditions

Conditions

MIN.

MIN.

MIN.

MIN.

TYP.

TYP.

TYP.

TYP.

MAX.

MAX.

MAX.

MAX.

Units

Isolation test voltage

Flash tested for 1 second

1000

VDC

Resistance

VISO = 1000VDC

1

GΩ

TECHNICAL

TECHNICAL

TECHNICAL

TECHNICAL

TECHNICAL

TECHNICAL

TECHNICAL

NOTES

NOTES

NOTES

NOTES

NOTES

NOTES

NOTES

ISOLATION

ISOLATION

ISOLATION

ISOLATION VOLTAGE

VOLTAGE

VOLTAGE

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.

MICRODC WRA-YLS-3W 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 WRA-YLS-3W 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

REPEATED

REPEATED

REPEATED HIGH-VOLTAGE

HIGH-VOLTAGE

HIGH-VOLTAGE

HIGH-VOLTAGE ISOLATION

ISOLATION

ISOLATION

ISOLATION TESTING

TESTING

TESTING

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 WRA-YLS-3W series has an EI ferrite core, 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.