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9

HTA-SERIES

Application Notes:

DC-DC converters constructed with aluminium-silicon

(ALSi) controlled expansion alloy benefit from low mass,

high thermal conductivity, and CTE match to substrates

mounted in them. The one disadvantage over traditional

cold rolled steel packages (CRS) however is that the ALSi

material is more brittle than the CRS. For this reason, it is

important to avoid using a thermal pad or gasket.

The HTA-Series DC-DC converter requires 8-32 size

screws and #8 flat washers.

The minimum recommended mouting surface flatness is

0.002” per inch.

The Procedure for mounting the converter is as follows:

1. Check all surfaces for foreign material, burrs, or

anything that may interfere with the different parts.

2. Place the converter on the mounting surface and line it

up with mounting holes.

3. Install screws using appropriate washers and tighten

by hand (~ 4 in.oz) in the sequence shown below in the

diagram.

.4. Tighten the screws with appropriate torque driver using

a controlled torque of up to 20-24 in.lb in the sequence

as shown in the diagram.