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参数资料
| 型号： | LM2595ATPBCKGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 17/25页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR LM2595ATPBCKG |
| 设计资源： | LM2595ATPBCKGEVB BOM LM2595ATPBCKGEVB Gerber Files LM2595ATPBCKGEVB Schematic |
| 特色产品： | Evaluation Boards & Kits |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 5V |
| 电流 - 输出： | 1A |
| 输入电压： | 4.5 ~ 40 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 150kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | LM2595 |
| 其它名称： | LM2595ATPBCKGEVBOS |
LM2595
3. T J(max)
maximum allowed junction temperature
(125 ° C for the LM2595). For a conservative
design, the maximum junction temperature
should not exceed 110 ° C to assure safe
operation. For every additional +10 ° C
temperature rise that the junction must
Packages Not on a Heatsink (Free ? Standing)
For a free ? standing application when no heatsink is used,
the junction temperature can be determined by the following
expression:
T J = (R q JA ) (P D ) + T A
d + on + O ,
V in
withstand, the estimated operating lifetime
of the component is halved.
4. R q JC package thermal resistance junction ? case.
5. R q JA package thermal resistance junction ? ambient.
The following formula is to calculate the approximate
total power dissipated by the LM2595:
P D = (V in x I Q ) + d x I Load x V sat
where d is the duty cycle and for buck converter
t V
T
I Q (quiescent current) and V sat can be found in the
LM2595 data sheet,
V in is minimum input voltage applied,
V O is the regulator output voltage,
I Load is the load current.
The dynamic switching losses during turn ? on and
turn ? off can be neglected if proper type catch diode is used.
The junction temperature can be determined by the
following expression:
T J = (R q JA ) (P D ) + T A
where (R q JA )(P D ) represents the junction temperature rise
caused by the dissipated power and T A is the maximum
ambient temperature.
Where (R q JA ) (P D ) represents the junction temperature rise
caused by the dissipated power and T A is the maximum
ambient temperature.
Packages on a Heatsink
If the actual operating junction temperature is greater than
the selected safe operating junction temperature determined
in step 3, than a heatsink is required. The junction
temperature will be calculated as follows:
T J = P D (R q JA + R q CS + R q SA ) + T A
Where R q JC is the thermal resistance junction ? case,
R q CS is the thermal resistance case ? heatsink,
R q SA is the thermal resistance heatsink ? ambient.
If the actual operating temperature is greater than the
selected safe operating junction temperature, then a larger
heatsink is required.
Some Aspects That can Influence Thermal Design
It should be noted that the package thermal resistance and
the junction temperature rise numbers are all approximate,
and there are many factors that will affect these numbers,
such as PC board size, shape, thickness, physical position,
location, board temperature, as well as whether the
surrounding air is moving or still.
Other factors are trace width, total printed circuit copper
area, copper thickness, single ? or double ? sided, multilayer
board, the amount of solder on the board or even color of the
traces.
The size, quantity and spacing of other components on the
board can also influence its effectiveness to dissipate the
heat.
12 to 25 V
Feedback
R4
Unregulated
DC Input
+V in
LM2595
L1
100 m H
C in
100 m F/50 V
ON/OFF
GND
D1
1N5819
R3
C out
220 m F
C FF
? 12 V @ 0.7 A
Regulated
Output
Figure 23. Inverting Buck ? Boost Develops ? 12 V
http://onsemi.com
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2595DSADJG | 功能描述:直流/直流开关调节器 1A BUCK SW REG 150KHZ RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| LM2595DSADJR4G | 功能描述:直流/直流开关调节器 1A BUCK SW REG 150KHZ RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| 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/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM2595S12 | 制造商:Texas Instruments 功能描述:IC SWITCHING REG 1A 12V SMD 2595 |
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