ADDC02803SC View Datasheet(PDF) - Analog Devices
Part Name
Description
Manufacturer
ADDC02803SC Datasheet PDF : 18 Pages
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ADDC02803SC/ADDC02805SA
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.
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
Figure 34. Hot Spots (Shaded Areas) of DC/DC Converter
+28VDC
PS1
1
17
2 ADDC02805SA 16
OR
10 ADDC02803SC
15
14
13
11
12
RLOAD
28RTN
C1
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
+28VDC
C1
28RTN
PS1
1
17
2 ADDC02805SA
8
10
OR
ADDC02803SC
16
15
14
13
11
12
I SHARE
PS2
1
17
2
8
10
ADDC02805SA
OR
ADDC02803SC
16
15
14
13
11
12
VOUT+
+SENSE PS1
+SENSE PS2
–SENSE PS1
–SENSE PS2
RLOAD
VOUT–
NOTE: VALUE OF C1 IS DEPENDENT ON SOURCE IMPEDANCE.
REFER TO SECTION ON SYSTEM INSTABILITY CONSIDERATIONS.
Figure 37. Typical Connections for Paralleling Two Converters
–16–
REV. A
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