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參數(shù)資料
| 型號： | TPS24711DGSR |
| 廠商： | Texas Instruments |
| 文件頁數(shù)： | 23/34頁 |
| 文件大小： | 2792K |
| 描述： | IC CTRLR HOT SWAP 2.5-18V 10MSOP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 熱交換控制器 |
| 應(yīng)用： | 通用 |
| 內(nèi)部開關(guān)： | 無 |
| 電流限制： | 可調(diào) |
| 電源電壓： | 2.5 V ~ 18 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 10-MSOP |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | 296-28562-6 |
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LIM
SENSE
SNS PL_MIN
IN MAX
P R
29.3 W 2 m
4.19 mV (> 3 mV)
V
14 V
-
?/DIV>
?/DIV>
W
=
=
=
PROG
LIM
SENSE
PROG
3125
R
=
P + R
herefore,
3125
R
=
= 53.15 k
(
)
( )
(
)
(
)
2
J(MAX)2
MAX
DS(on)
CA
A(MAX)
LIM
JC
2
LIM
T
I
r
R
T
0.8
,
R
herefore,
130 C
12 A
0.002
51 C/W 1.8 C/W
50 C
0.8
29.3 W
q
q
?/DIV>
?/DIV>
-
?/DIV>
?/DIV>
+
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?nbsp -
?/DIV>
W?nbsp ?/DIV>
- ?/DIV>
+ ?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
=
?/DIV>
J(MAX)
A(MAX)
DS(on)(MAX)
2
MAX
JA
DS(on)(MAX)
2
T
T
,
I
R
herefore,
150 C 50 C
13.6 m
12 A
51 C/W
q
-
=
?/DIV>
?nbsp - ?/DIV>
=
=
W
?nbsp ?/DIV>
TPS24710,TPS24711
TPS24712,TPS24713
www.ti.com
SLVSAL2E JANUARY 2011REVISED NOVEMBER 2013
Next select the on resistance of the transistor, r
DS(on)
. The maximum on-resistance must not generate a voltage
greater then the minimum power-good threshold voltage of 140 mV. Assuming a current limit of 12 A, a
maximum r
DS(on)
of 11.67 m& is required. Also consider the effect of r
DS(on)
upon the maximum operating
temperature T
J(MAX)
of the MOSFET. Equation 6 computes the value of r
DS(on)(MAX)
at a junction temperature of
T
J(MAX)
. Most manufacturers list r
DS(on)(MAX)
at 25癈 and provide a derating curve from which values at other
temperatures can be derived. Compute the maximum allowable on-resistance, r
DS(on)(MAX)
, using Equation 6.
(6)
Taking these factors into consideration, the TI CSD16403Q5 was selected for this example. This transistor has a
V
GS(MAX)
rating of 16 V, a V
DS(MAX)
rating of 25 V, and a maximum r
DS(on)
of 2.8 m?at room temperature. During
normal circuit operation, the MOSFET can have up to 10 A flowing through it. The power dissipation of the
MOSFET equates to 0.24 W and a 9.6癈 rise in junction temperature. This is well within the data sheet limits for
the MOSFET. The power dissipated during a fault (e.g., output short) is far larger than the steady-state power.
The power handling capability of the MOSFET must be checked during fault conditions.
STEP 3. Choose Power-Limit Value, P
LIM
, and R
PROG
MOSFET M
1
dissipates large amounts of power during inrush. The power limit P
LIM
of the TPS24710/11/12/13
should be set to prevent the die temperature from exceeding a short-term maximum temperature, T
J(MAX)2
. The
short-term T
J(MAX)2
could be set as high as 130癈 while still leaving ample margin to the usual manufacturers
rating of 150癈. Equation 7 is an expression for calculating P
LIM
,
(7)
where R
窲C
is the junction-to-case thermal resistance of the MOSFET, r
DS(on)
is the resistance at the maximum
operating temperature, and the factor of 0.8 represents the tolerance of the constant-power engine. For an
ambient temperature of 50癈, the calculated maximum P
LIM
is 29.3 W. From Equation 1, a 53.6-k&, 1% resistor
is selected for R
PROG
(see Equation 8).
(8)
V
SNS-PL_MIN
is the minimum sense voltage during power limit operation. Due to offsets of internal amplifiers,
programmed power limit (P
LIM
) accuracy degrades at low V
SNS-PL_MIN
and could cause start-up issues. To ensure
reliable operation, verify that V
SNS,PL,MIN
> 3 mV using Equation 9.
(9)
Copyright ?20112013, Texas Instruments Incorporated
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Product Folder Links: TPS24710 TPS24711 TPS24712 TPS24713
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| TPS24713DGS | 功能描述:熱插拔功率分布 2.5-18V Hi Eff Hot- Swap 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 |
| TPS24713DGSR | 功能描述:熱插拔功率分布 2.5-18V Hi Eff Hot- Swap 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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