B

-XT

Series

Series

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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

μ

s

μ

s

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