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參數資料
| 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： | 14/33頁 |
| 文件大?。?/td> | 1096K |
| 代理商： | TPS2492PW |
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SENSE
LIMIT
V
50mV
R
1.042m
1.2
I
1.2
40A
=
LIMIT(MAX)
SENSE
55
I
55
R
1m
=
SENSE( MAX )
V
mV
A
2
LIMIT(MAX)
I
55
1
3 025
=
=
W =
RSENSE
SENSE
P
R
A
m
.
W
J(MAX)
A(MAX)
DSON(MAX)
J
2
JA
LIMIT(NOM)
T
125°C
50°C
R
3m
at T
= 125°C
R
I
10
(50A)
-
=
°
C
W
q
www.ti.com
SLUSA65A – JULY 2010 – REVISED AUGUST 2010
1. Choose RSENSE
Calculate RSENSE using a multiplier factor of 1.2 (20%) for VSENSE and RSENSE tolerance along with some
additional margin.
(5)
Choose RSENSE = 1 m, resulting in a nominal 50 A current limit.
(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 typical characteristics 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. Assume that a thermal resistance, RqJA
of 10 °C/W can be achieved by reinforcing the typical 40°C/W for a 12 inch copper pad with copper on multiple
layers and some airflow.
(8)
Assume that we are able to find a suitable FET with an RDSON of 0.74 mΩ at 25°C and 1.18 mΩ at 125°C. These
devices are in a package such as a D2PAK with a large copper base and very low RqJC.
The junction-to-ambient thermal resistance, RqJA, depends upon the package style chosen and the details of
heat-sinking and cooling including the PCB layout. Actual “in-system” temperature measurements will be required
to validate thermal performance.
Copyright 2010, Texas Instruments Incorporated
21
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相關代理商/技術參數 |
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|---|---|
| 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開發工具 TPS2493 Hot Swap ontroller Eval Mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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| 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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