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參數(shù)資料
| 型號(hào)： | LM78M15 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 5.0 AMP POSITIVE VOLTAGE REGULATOR |
| 中文描述： | 5.0放大器正電壓穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 6/11頁(yè) |
| 文件大小： | 310K |
| 代理商： | LM78M15 |
Typical Performance Characteristics
(Continued)
Design Considerations
The LM78MXX/LM341XX fixed voltage regulator series has
built-in thermal overload protection which prevents the de-
vice from being damaged due to excessive junction tem-
perature.
The regulators also contain internal short-circuit protection
which limits the maximum output current, and safe-area pro-
tection for the pass transistor which reduces the short-circuit
current as the voltage across the pass transistor is in-
creased.
Although the internal power dissipation is automatically lim-
ited, the maximum junction temperature of the device must
be kept below +125C in order to meet data sheet specifica-
tions. An adequate heatsink should be provided to assure
this limit is not exceeded under worst-case operating condi-
tions (maximum input voltage and load current) if reliable
performance is to be obtained).
1.0 Heatsink Considerations
When an integrated circuit operates with appreciable cur-
rent, its junction temperature is elevated. It is important to
quantify its thermal limits in order to achieve acceptable per-
formance and reliability. This limit is determined by summing
the individual parts consisting of a series of temperature
rises from the semiconductor junction to the operating envi-
ronment. A one-dimension steady-state model of conduction
heat transfer is demonstrated in The heat generated at the
device junction flows through the die to the die attach pad,
through the lead frame to the surrounding case material, to
the printed circuit board, and eventually to the ambient envi-
ronment. Below is a list of variables that may affect the ther-
mal resistance and in turn the need for a heatsink.
R
θ
JC
(Component Variables) R
θ
CA
(Application Variables)
Leadframe Size & Material
Mounting Pad Size, Material,
& Location
Placement of Mounting Pad
PCB Size & Material
Traces Length & Width
Adjacent Heat Sources
No. of Conduction Pins
Die Size
Die Attach Material
Molding Compound Size and
Material
Volume of Air
Air Flow
Ambient Temperature
Shape of Mounting Pad
Quiescent Current
DS010484-16
Output Impedance
DS010484-17
Line Transient Response
DS010484-7
Load Transient Response
DS010484-8
www.national.com
6
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM78M15CH | 5.0 AMP POSITIVE VOLTAGE REGULATOR |
| LM78M15CT | 5.0 AMP POSITIVE VOLTAGE REGULATOR |
| LM78XX | LINEAR INTEGRATED CIRCUIT |
| LM78XX | Series Voltage Regulators |
| LM7900 | 3- TERMINAL NEGATIVE OUTPUT VOLTAGE REGULATORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM78M15CH/NOPB | 功能描述:IC REG LDO 15V .5A TO-39 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:4V 輸入電壓:最高 16V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.28V @ 150mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:150mA 電流 - 限制（最小）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:5-VFBGA 供應(yīng)商設(shè)備封裝:5-uSMD 包裝:Digi-Reel® 其它名稱:LP2985AIBP-4.0DKR |
| LM78M15CT | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 0.5A/15V Positive Voltage Regulator RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| LM78M15CT/NOPB | 制造商:Texas Instruments 功能描述:Standard Regulator Pos 15V 0.5A 3-Pin(3+Tab) TO-220 Rail |
| LM78M18CT | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 0.5A/18V Positive Voltage Regulator RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| LM78M24CT | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 0.5A/24V Positive Voltage Regulator RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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