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參數(shù)資料
型號(hào): TPS2481PW
廠商: TEXAS INSTRUMENTS INC
元件分類(lèi): 電源管理
英文描述: POWER SUPPLY SUPPORT CKT, PDSO20
封裝: GREEN, PLASTIC, TSSOP-20
文件頁(yè)數(shù): 14/56頁(yè)
文件大小: 1381K
代理商: TPS2481PW
SENSE
S
LIMIT
V
50mV
R
1.042m
1.2
I
1.2
40A
=
LIMIT(MAX)
S
55
I
55
R
1m
SENSE( MAX )
V
mV
A
=
2
LIMIT(MAX)
I
55
1
3 025
S
R Power
R
A
m
.
W
=
=
W =
J(MAX)
A(MAX)
JA
LIMIT(NOM)
T
125
T
50
R
10
I
50
=
C
C,
,
A
W
q
J(MAX)
A(MAX)
DSON(MAX)
2
JA
LIMIT(NOM)
T
125C
50C
R
3m
R
I
10
(50A)
-
=
C
W
q
www.ti.com
SLUS939B – APRIL 2010 – REVISED DECEMBER 2010
1. Choose RS
The following equation includes a factor of 1.2 (20%) for VSENSE and RS tolerance along with some additional
margin.
(5)
Choose RS = 1 m
(6)
(7)
Multiple sense resistors in parallel should be considered.
2. Choose M1
Select the M1 VDS rating allowing for maximum input voltage and transients. Then select an operating RDSON,
package, and cooling to control the operating temperature. Most manufacturers list RDSON(MAX) at 25°C and
provide a derating curve from which values at other temperatures can be derived. The next equation can be used
to estimate desired RDSON(MAX) at the maximum operating junction temperature of TJ(MAX). (usually 125°C). TA(MAX)
is the maximum expected ambient temperature.
(8)
(9)
The junction-to-ambient thermal resistance RqJA, depends upon the package style chosen and the details of
heat-sinking and cooling including the PCB. Actual “in-system” temperature measurements will be required to
validate heat-sinking and cooling performance.
Copyright 2010, Texas Instruments Incorporated
21
Product Folder Link(s): TPS2480 TPS2481
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