ADDC02803SC/ADDC02805SA

REV. A

–16–

The pins of the converter are typically connected to the next

higher level assembly by bending them at right angles, either

down or up, and cutting them shorter for insertion in printed

circuit board through holes. In order to maintain the hermetic

integrity of the seals around the pins, a fixture should be used

for bending the pins without stressing the pin-to-sidewall seals.

It is recommended that the minimum distance between the

package edge and the inside of the pin be 100 mils (2.54 mm)

for the 40 mil (1.02 mm) diameter pins; 120 mils (3.05 mm)

from the package edge to the center of the pin as shown in

Figure 35.

0.100"

(2.54mm)

0.120"

(3.05mm)

Figure 35. Minimum Bend Radius of 40 Mil (1.02 mm)

Pins

1

2

10

11

17

16

15

14

13

12

ADDC02805SA

OR

ADDC02803SC

PS1

C1

+28VDC

28RTN

RLOAD

NOTE: VALUE OF C1 IS DEPENDENT ON SOURCE IMPEDANCE.

REFER TO SECTION ON SYSTEM INSTABILITY CONSIDERATIONS.

Figure 36. Typical Power Connections and External Parts for Converter

1

2

8

10

11

17

16

15

14

13

12

1

2

8

10

11

17

16

15

14

13

12

PS2

PS1

C1

+28VDC

28RTN

+SENSE PS1

+SENSE PS2

–SENSE PS1

–SENSE PS2

RLOAD

NOTE: VALUE OF C1 IS DEPENDENT ON SOURCE IMPEDANCE.

REFER TO SECTION ON SYSTEM INSTABILITY CONSIDERATIONS.

ADDC02805SA

OR

ADDC02803SC

ADDC02805SA

OR

ADDC02803SC

Figure 37. Typical Connections for Paralleling Two Converters

MECHANICAL CONSIDERATIONS

When mounting the converter into the next higher level assembly,

it is important to ensure good thermal contact is made between

the converter and the external heat sink. Poor thermal connec-

tion can result in the converter shutting off, due to the tempera-

ture shutdown feature (Pin 9), or reduced reliability for the

converter due to higher-than-anticipated junction and case

temperatures. For these reasons the mounting tab locations

were selected to ensure good thermal contact is made near the

hot spots of the converter, which are shown in the shaded areas

of Figure 34.

Figure 34. Hot Spots (Shaded Areas) of DC/DC Converter