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參數(shù)資料
| 型號： | LM2678 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator |
| 中文描述： | 高效率的SIMPLE SWITCHER第5A降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 5/27頁 |
| 文件大?。?/td> | 459K |
| 代理商： | LM2678 |
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All Output Voltage Versions
Electrical Characteristics
(Continued)
Note 4:
All limits are guaranteed at room temperature (standard type face) and at
temperature extremes (bold type face)
. All room temperature limits are 100%
tested during production with T
A
= T
J
= 25C. All limits at temperature extremes are guaranteed via correlation using standard standard Quality Control (SQC)
methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
Note 5:
Junction to ambient thermal resistance (no external heat sink) for the 7 lead TO-220 package mounted vertically, with
1
2
inch leads in a socket, or on a PC
board with minimum copper area.
Note 6:
Junction to ambient thermal resistance (no external heat sink) for the 7 lead TO-220 package mounted vertically, with
1
2
inch leads soldered to a PC board
containing approximately 4 square inches of (1 oz.) copper area surrounding the leads.
Note 7:
Junction to ambient thermal resistance for the 7 lead TO-263 mounted horizontally against a PC board area of 0.136 square inches (the same size as the
TO-263 package) of 1 oz. (0.0014 in. thick) copper.
Note 8:
Junction to ambient thermal resistance for the 7 lead TO-263 mounted horizontally against a PC board area of 0.4896 square inches (3.6 times the area
of the TO-263 package) of 1 oz. (0.0014 in. thick) copper.
Note 9:
Junction to ambient thermal resistance for the 7 lead TO-263 mounted horizontally against a PC board copper area of 1.0064 square inches (7.4 times the
area of the TO-263 package) of 1 oz. (0.0014 in. thick) copper. Additional copper area will reduce thermal resistance further. See the thermal model in Switchers
Made Simple
software.
Note 10:
Junction to ambient thermal resistance for the 14-lead LLP mounted on a PC board copper area equal to the die attach paddle.
Note 11:
Junction to ambient thermal resistance for the 14-lead LLP mounted on a PC board copper area using 12 vias to a second layer of copper equal to die
attach paddle. Additional copper area will reduce thermal resistance further. For layout recommendations, refer to Application Note AN-1187.
L
www.national.com
5
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM2679S-12 | SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit |
| LM2679S-3.3 | SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit |
| LM2679S-5.0 | SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit |
| LM2679T-12 | 392 Series Industrial Potentiometer, Conductive Plastic Element, PC Terminals, 0.5 W Power Rating, 250 Ohm Resistance Value |
| LM2679T-3.3 | 392 Series Industrial Potentiometer, Conductive Plastic Element, PC Terminals, 0.5 W Power Rating, 2.5 kOhm Resistance Value |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2678_05 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER㈢ High Efficiency 5A Step-Down Voltage Regulator |
| LM2678-12 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator |
| LM2678-3.3 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator |
| LM2678-5.0 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator |
| LM2678-ADJ | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator |
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