LTM4601HVV View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LTM4601HVV
Linear Technology
'LTM4601HVV' PDF : 30 Pages View PDF
LTM4601HV
APPLICATIONS INFORMATION
Thermal Considerations and Output Current Derating
The power loss curves in Figures 7 and 8 can be used
in coordination with the load current derating curves in
Figures 9 to 16 for calculating an approximate θJA for the
module with various heat sinking methods. Thermal models
are derived from several temperature measurements at
the bench and thermal modeling analysis. Thermal Ap-
plication Note 103 provides a detailed explanation of the
analysis for the thermal models and the derating curves.
Tables 3 and 4 provide a summary of the equivalent θJA
for the noted conditions. These equivalent θJA parameters
are correlated to the measured values, and are improved
with air flow. The case temperature is maintained at 100°C
or below for the derating curves. The maximum case
temperature of 100°C is to allow for a rise of about 13°C
to 25°C inside the µModule with a thermal resistance θJC
from junction to case between 6°C/W to 9°C/W. This will
maintain the maximum junction temperature inside the
µModule below 125°C.
Safety Considerations
The LTM4601HV modules do not provide isolation from
VIN to VOUT. There is no internal fuse. If required, a
slow blow fuse with a rating twice the maximum input
current needs to be provided to protect each unit from
catastrophic failure.
5.0
4.5
4.0
3.5
24VIN
3.0
12VIN
2.5
2.0
1.5
5VIN
1.0
0.5
0
0
2
4
6
8 10 12
LOAD CURRENT (A)
4601HV F07
Figure 7. 1.5VOUT Power Loss
6
5
4
24VIN
3
12VIN
2
1
0
0
2
4
6
8 10 12
LOAD CURRENT (A)
4601HV F08
Figure 8. 3.3VOUT Power Loss
12
10
8
6
4
2
5VIN, 1.5VOUT 0LFM
5VIN, 1.5VOUT 200LFM
5VIN, 1.5VOUT 400LFM
0
50 60
70
80
90
100
AMBIENT TEMPERATURE (°C)
4601HV F09
Figure 9. No Heat Sink 5VIN
12
10
8
6
4
2
5VIN, 1.5VOUT 0LFM
5VIN, 1.5VOUT 200LFM
5VIN, 1.5VOUT 400LFM
0
50 60
70
80
90
100
AMBIENT TEMPERATURE (°C)
4601HV F10
Figure 10. BGA Heat Sink 5VIN
16
4601hvfb
Share Link: 