数据搜索系统，热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

预览 PDF HTML

UM0670 数据表(PDF) 39 Page - STMicroelectronics

部件名 UM0670
功能描述  80 W offline LED driver with PFC
PDF  43 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

UM0670 数据表(HTML) 39 Page - STMicroelectronics

Back Button UM0670 Datasheet HTML 35Page - STMicroelectronics UM0670 Datasheet HTML 36Page - STMicroelectronics UM0670 Datasheet HTML 37Page - STMicroelectronics UM0670 Datasheet HTML 38Page - STMicroelectronics UM0670 Datasheet HTML 39Page - STMicroelectronics UM0670 Datasheet HTML 40Page - STMicroelectronics UM0670 Datasheet HTML 41Page - STMicroelectronics UM0670 Datasheet HTML 42Page - STMicroelectronics UM0670 Datasheet HTML 43Page - STMicroelectronics  
Zoom Inzoom in Zoom Outzoom out
 39 / 43 page
background image
Design calculation
UM0670
39/43
Doc ID 15327 Rev 2
Equation 10
Power MOSFET conduction loss is:
Equation 11
Where the power MOSFET chosen is the STF9NM50N (see datasheet Section 11:
References and related materials: 3.) and its RDS(on) for 70 °C is:
Equation 12
Power MOSFET switching losses can be approximately calculated (turn OFF time was
measured 120 ns - see Figure 19):
Equation 13
The total power loss on the power MOSFET is 1.839 W, so the heat sink can be calculated
from following equation:
Equation 14
And maximum heat sink-to-ambient resistance is:
Equation 15
The heat sink used in the power MOSFET on the STEVAL-ILL013V1 has a thermal
resistance of 13.5 °C / W, and therefore this heat sink is optimized for this design.
The last power component remaining to be calculated is the power diode. The diode
conducts during the OFF time, and therefore its average current is:
Equation 16
l
RMS
2
D
×
l
AVR
2
l
PP
2
12
--------
+
0.2 1
0.8
2
12
-----------
+
0.21
=
==
P
CON
l
RM S
2
R
DS ON
()
×
70
° C
()
0.21
0.756
0.159W
=
×
==
R
DS ON
() ° C
()
R
DS ON
() ° C
()
1.35
0.56
1.35
0.756
Ω
=
×
=
×
=
P
SW
V
IN
I
MAX
t
OFF SW
f
×
×
×
2
--------------------------------------------------------------------
400
1.4
120
10
9
–
50
10
3
×
×
×
×
×
2
---------------------------------------------------------------------------------------------
1.68W
=
=
=
P
TOT
T
JM AX MOSFET
T
A
–
R
thJC
R
th CH
R
thHA
++
------------------------------------------------------------
=
R
thH A
T
JM AX MOSFET
T
A
–
P
TOT
------------------------------------------------------
R
thJC
–
R
th C H
70
30
–
1.839
-------------------
5
–
0.5
16.25
° CW
⁄
=
–
=
–
<
I
AVR D
1D
–
()
I
MAX
I
MIN
+
2
------------------------------
×
10.2
–
()
1.4
0.6
+
2
-----------------------
×
0.8A
=
=
=



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43


数据表 下载

Go To PDF Page


链接网址



ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   数据表链接    |   链接交换   |   制造商名单
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com