- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384950 > TC2055 (Microchip Technology Inc.) CONNECTOR ACCESSORY PDF資料下載
參數(shù)資料
| 型號(hào)： | TC2055 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | CONNECTOR ACCESSORY |
| 中文描述： | 連接器附件 |
| 文件頁數(shù)： | 5/16頁 |
| 文件大小： | 519K |
| 代理商： | TC2055 |
2002 Microchip Technology Inc.
DS21663B-page 5
TC2054/2055/2186
4.0
THERMAL CONSIDERATIONS
4.1
Power Dissipation
The amount of power the regulator dissipates is prima-
rily a function of input and output voltage, and output
current.
The following equation is used to calculate worst case
power dissipation:
EQUATION 4-1:
The maximum allowable power dissipation (Equation
4-2) is a function of the maximum ambient temperature
(T
AMAX
), the maximum allowable die temperature (125
°C) and the thermal resistance from junction-to-air
(
θ
JA
). The 5-Pin SOT-23A package has a
θ
JA
of
approximately 220°C/Watt when mounted on a typical
two layer FR4 dielectric copper clad PC board.
EQUATION 4-2:
Equation 4-1 can be used in conjunction with Equation
4-2 to ensure regulator thermal operation is within lim-
its. For example:
Maximum allowable power dissipation:
= 318mW
In this example, the TC2054 dissipates a maximum of
only 20.7mW; far below the allowable limit of 318mW.
In a similar manner, Equation 4-1 and Equation 4-2 can
be used to calculate maximum current and/or input
voltage limits.
4.2
Layout Considerations
The primary path of heat conduction out of the package
is via the package leads. Therefore, layouts having a
ground plane, wide traces at the pads, and wide power
supply bus lines combine to lower
θ
JA
and, therefore,
increase the maximum allowable power dissipation
limit.
P
D
≈
(V
IN
– V
OUTMIN
)I
LOADMAX
Where:
P
D
V
INMAX
V
OUTMIN
I
LOADMAX
=
=
=
=
Worst case actual power dissipation
Maximum voltage on V
IN
Minimum regulator output voltage
Maximum output (load) current
Where all terms are previously defined
P
D
MAX
T
MAX
----------------------------------
T
MAX
θ
JA
=
Given:
V
INMAX
V
OUTMIN
I
LOADMAX
= 40mA
T
AMAX
= 3.0V ±5%
= 2.7V – 2.5%
= 55°C
Find
:
1. Actual power dissapation
2. Maximum allowable dissapation
Actual power dissipation:
P
D
≈
(V
INMAX
– V
OUTMIN
)I
LOADMAX
= [(3.0 x 1.05) – (2.7 x .975)]40 x 10
–3
= 20.7mW
P
D
MAX
T
MAX
-------------------------------------
T
MAX
–
(
)
θ
JA
=
-125
55
–
(
)
220
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TC2186 | 50mA, 100mA, and 150mA CMOS LDOs with Shutdown and Error Output |
| TC2117 | D10 - BACKSHELL ENVIRON EMI-RFI 90 DEG M |
| TC253SPD-30 | Impactron High Sensitivity CCD (Non-Cooled) |
| TC253SPD-B0 | 680 x 500 PIXEL IMPACTRON CCD IMAGE SENSOR |
| TC303 | POWER NAND GATES |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC2055-1.8VCTTR | 功能描述:低壓差穩(wěn)壓器 - LDO .1mA w/Shtdn & Error 1.8V RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC2055-2.5VCTTR | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:50 mA, 100 mA, and 150 mA CMOS LDOs with Shutdown and Error Output |
| TC2055-2.6VCTTR | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:50 mA, 100 mA, and 150 mA CMOS LDOs with Shutdown and Error Output |
| TC2055-2.7VCTTR | 功能描述:低壓差穩(wěn)壓器 - LDO .1mA w/Shtdn & Error 2.7V RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC2055-2.85VCTTR | 功能描述:低壓差穩(wěn)壓器 - LDO .1mA w/Shtdn & Error 2.85V RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。