參數(shù)資料
型號(hào)： LM2595J-ADJ-QML(5962-9650
廠商： National Semiconductor Corporation
元件分類： 圓形連接器
英文描述： Circular Connector; No. of Contacts:18; Series:LJT06R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:15-18
中文描述： SIMPLE SWITCHER系列電源轉(zhuǎn)換器150千赫1A步降穩(wěn)壓器
文件頁(yè)數(shù)： 22/29頁(yè)
文件大?。?/td> 935K
代理商： LM2595J-ADJ-QML(5962-9650
Application Information
(Continued)
but with copper areas greater than approximately 3 in
2
, only
small improvements in heat dissipation are realized. If fur-
ther thermal improvements are needed, double sided or mul-
tilayer PC-board with large copper areas are recommended.
The curves shown in Figure 20 show the LM2595S (TO-263
package) junction temperature rise above ambient tempera-
ture with a 1Aload for various input and output voltages. This
data was taken with the circuit operating as a buck switching
regulator with all components mounted on a PC board to
simulate the junction temperature under actual operating
conditions. This curve can be used for a quick check for the
approximate junction temperature for various conditions, but
be aware that there are many factors that can affect the junc-
tion temperature.
For the best thermal performance, wide copper traces and
generous amounts of printed circuit board copper should be
used in the board layout. (One exception to this is the output
(switch) pin, which should not have large areas of copper.)
Large areas of copper provide the best transfer of heat
(lower thermal resistance) to the surrounding air, and moving
air lowers the thermal resistance even further.
Package thermal resistance and junction temperature rise
numbers are all approximate, and there are many factors
that will affect these numbers. Some of these factors include
board size, shape, thickness, position, location, and even
board temperature. Other factors are, trace width, total
printed circuit copper area, copper thickness, single- or
double-sided, multilayer board and the amount of solder on
the board. The effectiveness of the PC board to dissipate
heat also depends on the size, quantity and spacing of other
components on the board, as well as whether the surround-
ing air is still or moving. Furthermore, some of these compo-
nents such as the catch diode will add heat to the PC board
and the heat can vary as the input voltage changes. For the
inductor, depending on the physical size, type of core mate-
rial and the DC resistance, it could either act as a heat sink
taking heat away from the board, or it could add heat to the
board.
DS012565-34
Circuit Data for Temperature Rise Curve
TO-220 Package (T)
Capacitors
Through hole electrolytic
Inductor
Through hole, Schott, 68 μH
Diode
Through hole, 3A 40V, Schottky
PC board
3 square inches single sided 2 oz. copper
(0.0028")
FIGURE 19. Junction Temperature Rise, TO-220
DS012565-35
Circuit Data for Temperature Rise Curve
TO-263 Package (S)
Capacitors
Surface mount tantalum, molded “D” size
Inductor
Surface mount, Schott, 68 μH
Diode
Surface mount, 3A 40V, Schottky
PC board
3 square inches single sided 2 oz. copper
(0.0028")
FIGURE 20. Junction Temperature Rise, TO-263
www.national.com
22
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2595S12 制造商:Texas Instruments 功能描述:SWITCHING REG, 1A 12V, SMD, 2595 制造商:Texas Instruments 功能描述:SWITCHING REG, 1A 12V, SMD, 2595; Primary Input Voltage:24V; No. of Outputs:1; Output Voltage:12V; Output Current:1A; Voltage Regulator Case Style:TO-263; No. of Pins:5; Operating Temperature Min:-25C; Operating Temperature ;RoHS Compliant: Yes
LM2595S-12 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LM2595S12 制造商:Texas Instruments 功能描述:IC SWITCHING REG 1A 12V SMD 2595
LM2595S-12/NOPB 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LM2595S-3.3 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
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