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參數(shù)資料
| 型號： | IRU1075 |
| 廠商： | International Rectifier |
| 英文描述： | 7.5A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR |
| 中文描述： | 7.5A的低壓差型正，可調(diào)式穩(wěn)壓器 |
| 文件頁數(shù)： | 5/6頁 |
| 文件大小： | 94K |
| 代理商： | IRU1075 |
IRU1075
5
Rev. 1.1
06/29/01
Assuming the following specifications:
V
IN
= 5V
V
OUT
= 3.5V
I
OUT(MAX)
= 4.6A
T
A
= 35
!
C
The steps for selecting a proper heat sink to keep the
junction temperature below 135°C is given as:
1) Calculate the maximum power dissipation using:
2) Select a package from the regulator data sheet and
record its junction to case (or tab) thermal resistance.
Selecting TO-220 package gives us:
θ
JC
= 2.7
!
C/W
3) Assuming that the heat sink is black anodized, cal-
culate the maximum heat sink temperature allowed:
Assume,
θ
cs = 0.05
°
C/W (heat-sink-to-case ther-
mal resistance for black anodized)
4) With the maximum heat sink temperature calculated
in the previous step, the heat-sink-to-air thermal re-
sistance (
θ
SA
) is calculated by first calculating the
temperature rise above the ambient as follows:
5) Next, a heat sink with lower
θ
sa than the one calcu-
lated in Step 4 must be selected. One way to do this
is to simply look at the graphs of the “Heat Sink Temp
Rise Above the Ambient” vs. the “Power Dissipation”
and select a heat sink that results in lower tempera-
ture rise than the one calculated in previous step.
The following heat sinks from AAVID and Thermalloy
meet this criteria.
Air Flow (LFM)
0 100 200 300 400
Thermalloy 6021PB 6021PB 6073PB 6109PB 7141D
AAVID 534202B 534202B 507302 575002 576802B
P
D
= I
OUT
×
(V
IN
- V
OUT
)
P
D
= 4.6
×
(5 - 3.5) = 6.9W
T
S
= T
J
- P
D
×
(
θ
JC
+
θ
CS
)
T
S
= 135 - 6.9
×
(2.7 + 0.05) = 116
!
C
T = T
S
- T
A
= 116 - 35 = 81
!
C
T = Temperature Rise Above Ambient
T
D
6.9
θ
SA
= P
!
C/W
81
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