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| 型号： | IRU1075CMTR |
| 厂商： | International Rectifier |
| 文件页数： | 5/9页 |
| 文件大小： | 0K |
| 描述： | IC CONV PENTIUM P55C TO263-3 |
| 标准包装： | 750 |
| 应用： | 转换器，Intel Pentium?，P55C |
| 输入电压： | 2.55 V ~ 7 V |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 5.5 V |
| 工作温度： | 0°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-4，D²Pak（3 引线+接片），TO-263AA |
| 供应商设备封装： | TO-263 |
| 包装： | 带卷 (TR) |
IRU1075
Assuming the following specifications:
V IN = 5V
V OUT = 3.5V
I OUT(MAX) = 4.6A
T A = 35 8 C
The steps for selecting a proper heat sink to keep the
4) With the maximum heat sink temperature calculated
in the previous step, the heat-sink-to-air thermal re-
sistance ( u SA ) is calculated by first calculating the
temperature rise above the ambient as follows:
D T = T S - T A = 116 - 35 = 81 8 C
? T = Temperature Rise Above Ambient
= = 11.7 8 C/W
junction temperature below 135°C is given as:
1) Calculate the maximum power dissipation using:
u SA =
D T
P D
81
6.9
5) Next, a heat sink with lower u SA than the one calcu-
P D = I OUT 3 (V IN - V OUT )
P D = 4.6 3 (5 - 3.5) = 6.9W
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:
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.
θ JC = 2.7 8 C/W
Air Flow (LFM)
3) Assuming that the heat sink is black anodized, cal-
0
100
200
300
400
culate the maximum heat sink temperature allowed:
Thermalloy
6021PB
6021PB
6073PB 6109PB
7141D
Assume, u cs = 0.05 ° C/W (heat-sink-to-case ther-
AAVID
534202B 534202B 507302
575002 576802B
mal resistance for black anodized)
T S = T J - P D 3 ( u JC + u CS )
T S = 135 - 6.9 3 (2.7 + 0.05) = 116 8 C
IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105
TAC Fax: (310) 252-7903
Visit us at www.irf.com for sales contact information
Data and specifications subject to change without notice. 02/01
Rev. 1.2
08/01/02
www.irf.com
5
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