參數(shù)資料
型號(hào)： TPS2480PW
廠商： TEXAS INSTRUMENTS INC
元件分類： 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)： 15/56頁(yè)
文件大?。?/td> 1381K
代理商： TPS2480PW
J(MAX2)
A(MAX)
CA
JC
T
150
T
50
R
9 8
R
0 2
1 18
=
W
DS( on )
C
C,
.
,
.
,R
.
m
W
q
2
J(MAX2)
CA
LIMIT(NOM)
DSON
A(MAX)
LIM
C
0.7*(T
R
I
R
T
P
249
R
-
-
=
J
)
W
q
REF
OUT(NOM)
LIMIT(NOM)
V
4
1
V
12
I
50
S
V ,R
m ,
V ,
A
=
W
=
REF
LIM(MAX)
1V
V
P
2
S
kW
R
=
OUT(NOM)
LIMIT(NOM)
P
V
I
12
50
600
V
A
W
=
=
=
LIM(ACT)
S
PROG
2
P
R
2
249W
1m
V
0.498V
1V
=
REF
PROG1
PROG2
PROG
V
R
(
1)
140.6k
V
=
-
=
0
10
8
6
4
2
0
10
20
30
40
50
60
Current Limit vs. Vout (Vvcc=12V)
Output Voltage (V)
O
u
tp
u
t
C
u
r
re
n
t
(
A
m
p
s
)
SLUS939B – APRIL 2010 – REVISED DECEMBER 2010
www.ti.com
3. Choose the Power Limit PLIM and the PROG Resistors, RPROG1 and RPROG2
M1 dissipates large amounts of power during power-up or output short circuit. Power limit, PLIM should be set to
prevent M1 die temperature from exceeding a short term maximum temperature, TJ(MAX2). Short term TJ(MAX2)
may be set as high as 150°C while still leaving ample margin for the typical manufacturer's rating of 175°C. PLIM
can be estimated as follows:
(10)
(11)
Where RqCA is M1+PCB case-to-ambient thermal resistance, RqJC is M1 junction-to-case thermal resistance,
RDS(on) is M1 channel resistance at the maximum operating temperature, and the factor of 0.7 accounts for the
tolerance of the constant power engine. The maximum power limit for the constant power engine, PLIM(MAX) and
nominal power POUT(nom) settings for this circuit are calculated with the next equation:
(12)
(13)
(14)
The PROG resistors should be chosen using the smallest of PLIM , PLIM(MAX), or PLIM(MAX) values. Choose RPROG2
= 20 k
. Choose RPROG1 as shown below.
(15)
(16)
Choose RPROG1 = 140 k
The power and current limit curve for this configuration is shown in Figure 18.
Figure 18. TPS2480/81 Power and Current Limit Curve
22
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS2480 TPS2481
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