TDK iHA48040A033V* Input/Output Ripple and Noise Measurements, Safety Considerations, Reliability

Data Sheet: Veta® iHA48040A033V*, 3.3V/40A Output Half Brick Series

Input/Output Ripple and Noise Measurements:

Battery

2 1

12uH

1 2

220uF

esr<0.1

100KHz

2 1

	+
Cin	Vinput
33uF
esr<0.7
100KHz	-

+

Voutput

-

2 1

1

RLoad

Cext

2

Ground Plane

The input reflected ripple is measured with a current probe and oscilloscope. The ripple current is the current through the 12uH inductor. The capacitor Cin shall be at least 100uF/100V. One 470uF or two 220uF/100V capacitors in parallel are recommended.

The output ripple measurement is made approximately 9 cm (3.5 in.) from the power module using an oscilloscope and BNC socket. The capacitor Cext is located about 5 cm (2 in.) from the power module; its value varies from code to code and is found on the electrical data page for the power module of interest under the ripple & noise voltage specification in the Notes & Conditions column.

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.

Various safety agency approvals are pending on the iHx product family. 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. The case pin is considered a primary pin for the purpose of hi-pot testing.

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.

To preserve maximum flexibility, the power modules are not internally fused. An external input line normal blow fuse with the maximum rating stipulated in the Electrical Data section is required by safety agencies. A lower value fuse can be selected based upon the maximum dc input current and maximum inrush energy of the power module

Reliability:

The power modules are designed using TDK Innoveta’s stringent design guidelines for component derating, product qualification, and design reviews. Early failures are screened out by both burn-in and an automated final test. The MTBF is calculated to be greater

©2007 TDK Innoveta Inc.	' (877) 498-0099
iHA Datasheet 040207	16/17