2B

(S)D

Series

Series

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Temperature

graph

Tolerance

envelope

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

OUTPUT

REDUCTION

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 & Noise Characterization Method

All measurement to be taken with the following components connected to the UUT as detailed below. 50 Ohm coax cable, solder

connections one end, BNC plug at the other end.

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 specfied values.

Differential Mode Noise Test Schematic