參數(shù)資料
型號： TPS2492PW
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14
封裝： GREEN, PLASTIC, TSSOP-14
文件頁數(shù)： 15/33頁
文件大?。?/td> 1096K
代理商： TPS2492PW
(
)
2
J(MAX2)
CA
LIMIT(NOM)
DSON
A(MAX)
LIM
C
0.7
T
R
I
R
T
P
249
R
é
ù
-
-
=
J
W
q
LIM
PROG
LIM
P
249
V
0.498V
10
I
10
50
=
REF
4
5
PROG
V
R
(
1)
140.6k
V
=
-
=
V
OUT
- Output Voltage - V
0
10
30
60
I O
U
T
-
O
u
tp
u
t
C
u
r
e
n
t
-
A
OUTPUT CURRENT
vs
OUTPUT VOLTAGE (V
VCC
= 12 V)
12
8
4
0
50
2
6
10
20
40
SLUSA65A – JULY 2010 – REVISED AUGUST 2010
www.ti.com
3. Choose the Power Limit PLIM and the PROG Resistors, R4 and R5
M1 dissipates large amounts of power during power-up or output short circuit. Power limit, PLIM should be set to
prevent the M1 die temperature from exceeding a short term maximum temperature, TJ(MAX2). Short term TJ(MAX2)
may be set as high as 150°C (specified on FET datasheet) while still leaving ample margin for the typical
manufacturer's rating of 175°C. The R4 and R5 resistors set VPROG, programming the FET power dissipation.
Assume that RqJA is 10 °C/W, RqJC is 0.2 °C/W, and RqCA is 9.8 °C/W for the device we chose above. PLIM can be
estimated as follows:
(9)
Where RqCA is the M1 plus PCB case-to-ambient thermal resistance, RqJC is M1 junction-to-case thermal
resistance, RDSON is M1 channel resistance at the maximum operating temperature, and the factor of 0.7
accounts for the tolerance of the constant power engine. In this case we know that power limit is less than ILIMIT x
VIN and that power limit will control operation during a short circuit.
It is often advantageous to use a transient value of RqJC to get a usable solution, that is a VPROG within the
recommended range. If a current/power limited startup is used, transient RqJC should be based on the TIMER
period (see below). FET manufacturers typically provide transient thermal resistance in graphic format on their
datasheet. Additional information can be found in SLVA158.
The following equations calculate VPROG and R4 using an assumed R5 = 20 k.
(10)
(11)
Choose R4 = 140 k. The recommended minimum VPROG is 0.4 V. This is based on tolerance and accuracy of
the constant power engine making very low power-limited designs highly variable. Some suggestions to get
larger PLIM values are to start with a low static operating junction temperature, and to utilize the transient thermal
impedance (energy absorbing nature) of the package.
The output I vs. VOUT curve for this configuration is shown in Figure 20.
Figure 20. TPS2492/93 Power and Current Limit Curve
22
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS2492 TPS2493
相關(guān)PDF資料
PDF描述
TPS2540RTER 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS2492PW 制造商:Texas Instruments 功能描述:HOT SWAP CONTROLLER IC 80V TSSOP-14
TPS2492PWR 功能描述:熱插拔功率分布 Pos Hi-Vltg Pwr-Ltd Hotswap Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
TPS2493EVM-002 功能描述:電源管理IC開發(fā)工具 TPS2493 Hot Swap ontroller Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
TPS2493EVM-004 功能描述:電源管理IC開發(fā)工具 TPS2493 Hot Swap ontroller Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
TPS2493PW 功能描述:熱插拔功率分布 Pos Hi-Vltg Pwr-Ltd Hotswap Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
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