參數(shù)資料
型號(hào)： LTM4612IV#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 940 kHz SWITCHING FREQ-MAX, PBGA133
封裝： 15 X 15 MM, 2.82 MM HEIGHT, LEAD FREE, MO-222, LGA-133
文件頁(yè)數(shù)： 8/26頁(yè)
文件大小： 5123K
代理商： LTM4612IV#PBF
LTM4612
4612fa
applicaTions inForMaTion
tion. When the cooling is limited, proper output current
derating is necessary, considering ambient temperature,
airflow, input/output condition, and the need for increased
reliability.
The power loss curves in Figures 9 and 10 can be used
in coordination with the load current derating curves in
Figures 11 to 16 for calculating an approximate
θJA for
the module. Graph designation delineates between no
heat sink, and a BGA heat sink. Each of the load current
derating curves will lower the maximum load current as a
function of the increased ambient temperature to keep the
maximum junction temperature of the power module at
125°C maximum. This will maintain the maximum operat-
ing temperature below 125°C. Each of the derating curves
and the power loss curve that corresponds to the correct
output voltage can be used to solve for the approximate
θJA of the condition. Each figure has three curves that are
taken at three different air flow conditions. Each of the
derating curves in Figures 11 to 16 can be used with the
appropriate power loss curve in either Figure 9 or Figure
10 to derive an approximate
θJA. Table 3 provides the ap-
proximate
θJAforFigures11to16.Acompleteexplanation
of the thermal characteristics is provided in the thermal
application note, AN110.
Figure 9. Power Loss at
12VOUT and 15VOUT
Figure 10. Power Loss at 5VOUT
Figure 11. No Heat Sink
with 36VIN to 5VOUT
Figure 12. BGA Heat Sink
with 36VIN to 5VOUT
Figure 13. No Heat Sink
with 24VIN to 12VOUT
Figure 14. BGA Heat Sink
with 24VIN to 12VOUT
LOAD CURRENT (A)
0
POWER
LOSS
(W)
4
5
3
2
4
1
3
5
1
0
6
4612 F09
24VIN TO 12VOUT
36VIN TO 15VOUT
LOAD CURRENT (A)
0
POWER
LOSS
(W)
4
5
3
2
4
1
3
5
1
0
6
4612 F10
36VIN TO 5VOUT
AMBIENT TEMPERATURE (°C)
25
0
LOAD
CURRENT
(A)
1.0
2.0
3.0
35
45
55
65
85
75
95
4.0
5.0
0.5
1.5
2.5
3.5
4.5
105
4612 F11
0LFM
400LFM
200
LFM
AMBIENT TEMPERATURE (°C)
25
0
LOAD
CURRENT
(A)
1.0
2.0
3.0
35
45
55
65
85
75
95
4.0
5.0
0.5
1.5
2.5
3.5
4.5
105
4612 F12
0LFM
400LFM
200
LFM
AMBIENT TEMPERATURE (°C)
25
0
LOAD
CURRENT
(A)
1.0
2.0
3.0
35
45
55
65
85
75
95
4.0
5.0
0.5
1.5
2.5
3.5
4.5
105
4612 F13
0LFM
400LFM
200
LFM
AMBIENT TEMPERATURE (°C)
25
0
LOAD
CURRENT
(A)
1.0
2.0
3.0
35
45
55
65
85
75
95
4.0
5.0
0.5
1.5
2.5
3.5
4.5
105
4612 F14
0LFM
400LFM
200
LFM
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