TDK iFA Series manual Input/Output Ripple and Noise Measurements, Safety Considerations

Advance Data Sheet: MaxetaTM iFA Series

Input/Output Ripple and Noise Measurements:

Vs

Lin

C0

C1

+	+
Vin	Vout
-	-

Cext

RLoad

GroundPlane

The input reflected ripple is measured with a current probe and oscilloscope. The ripple current is the current through the 15uH inductor, Lin, with esr ≤ 10 mΩ, feeding a capacitor, C1, esr ≤ 350 mΩ @ 100kHz, across the module input voltage pins. The capacitor C1 across the input shall be at least two (2) 470µF/50V capacitors in parallel. A 470µF/50V capacitor for C0 is also recommended.

The output voltage ripple measurement is made approximately 5 cm (2 in.) from the power module using an oscilloscope and BNC socket. The capacitor Cext consisting of a 0.1µF and a 10µF ceramic capacitors and at least two (2) 220µF/50V aluminum electrolytic or tantalum capacitor (esr ≤ 200 mΩ) in parallel located about 5 cm (2 in.) from the power module.

At Io < Io,min, the module output is not required to be within the output voltage ripple and noise specification.

Safety Considerations:

All TDK Innoveta products are certified to regulatory standards by an independent, Certified Administrative Agency laboratory. UL 1950, 3rd edition (US & Canada), and other global certifications are typically obtained for each product platform.

The iFA products have the following certifications:

UL 60950 (US & Canada)

VDE 0805

CB Scheme (IEC 950)

CE Mark (EN60950)

For safety agency approval of the system in which the DC-DC power module is installed, the power module must be installed in compliance with the creepage and clearance requirements of the safety agency. The isolation is basic insulation. For applications requiring basic insulation, care must be taken to maintain minimum creepage and clearance distances when routing traces near the power module.

As part of the production process, the power modules are hi-pot tested from primary and secondary at a test voltage of 1500Vdc.

When the supply to the DC-DC converter is less than 60Vdc, the power module meets all of the requirements for SELV. If the input voltage is a hazardous voltage that exceeds 60Vdc, the output can be considered SELV only if the following conditions are met:

1)The input source is isolated from the ac mains by reinforced insulation.

2)The input terminal pins are not accessible.

3)One pole of the input and one pole of the output are grounded or both are kept floating.

4)Single fault testing is performed on the end system to ensure that under a single fault, hazardous voltages do not appear at the module output.

©2005 TDK Innoveta Inc.		￿ (877) 498-0099
iFA Advance Datasheet	6/6/2005	17/18