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| 型号： | LTM8040EV#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR HP CONST CURR 66-LGA |
| 产品培训模块： | High Voltage µModule DC/DC Regulators Power Module vs. Discrete DC to DC |
| 产品目录绘图： | LTM Series_15x15x4.3 |
| 设计资源： | LTM8040 Spice Model LTM8040 Gerber Files |
| 特色产品： | μModule Products DC/DC μModule Regulator Family |
| 标准包装： | 170 |
| 系列： | µModule® |
| 输入电压： | 4 ~ 36 V |
| 输出电压： | 2.5 ~ 13 V |
| 电流 - 输出： | 1A |
| 功率（瓦特）： | 13W |
| 安装类型： | 表面贴装 |
| 端接类型： | 表面安装 (SMD，SMT) |
| 尺寸/尺寸： | 0.59" L x 0.35" W x 0.17" H（15.0mm x 9.0mm x 4.3mm） |
| 工作温度： | 0°C ~ 125°C |
| 类型： | 降压，带调光 |
| 产品目录页面： | 2711 (CN2011-ZH PDF) |
LTM8040
APPLICATION INFORMATION
Capacitor Selection Considerations
The C IN capacitor values in Table 2 are the minimum rec-
ommended values for the associated operating conditions.
Applying capacitor values below those indicated in Table 2
is not recommended, and may result in undesirable
operation. Using larger values is generally acceptable, and
can yield improved performance, if it is necessary. Again,
it is incumbent upon the user to verify proper operation
over the intended system’s line, load and environmental
conditions.
Ceramic capacitors are small, robust and have very low
ESR. However, not all ceramic capacitors are suitable. X5R
and X7R types are stable over temperature and applied
voltage and give dependable service. Other types, includ-
ing Y5V and Z5U have very large temperature and voltage
coef ?cients of capacitance. In an application circuit they
may have only a small fraction of their nominal capacitance
resulting in much higher voltage ripple than expected.
A ?nal precaution regarding ceramic capacitors concerns
the maximum input voltage rating of the LTM8040. A
ceramic input capacitor combined with trace or cable
inductance forms a high Q (under damped) tank circuit. If
the LTM8040 circuit is plugged into a live supply, the input
voltage can ring to twice its nominal value, possibly ex-
ceeding the device’s rating. This situation is easily avoided
by introducing a small series damping resistance into the
circuit. This is most often taken care of by the presence
of an electrolytic bulk capacitor in the board.
High Temperature Considerations
The internal operating temperature of the LTM8040 must
be lower than the 125°C rating, so care should be taken
in the layout of the circuit to ensure good heat sinking of
the LTM8040. To estimate the junction temperature, ap-
proximate the power dissipation within the LTM8040 by
applying the typical ef ?ciency stated in this data sheet to
the desired output power, or, if you have an actual module,
by taking a power measurement. Then calculate the tem-
perature rise of the LTM8040 junction above the surface
of the printed circuit board by multiplying the module’s
power dissipation by the thermal resistance θ JA . The actual
thermal resistance of the LTM8040 to the printed circuit
board depends on the layout of the circuit board, but the
thermal resistance given in the Pin Con?guration, which
is based upon a 40.3cm 2 4 layer FR4 PC board, can be
used as a guide.
The LTM8040 is equipped with thermal protection that
reduces the output LED current if the internal operating
temperature is too high. This thermal protection is active
above the 125°C temperature rating of the LTM8040, so
continuous operation under this operating condition may
impair reliability.
8040fa
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTM8040IV#PBF | 功能描述:IC LED DRVR HP CONST CURR 66-LGA RoHS:是 类别:电源 - 板载 >> LED 驱动器 - 恒定电流 系列:µModule® 产品目录绘图:4015, 7021 Series 标准包装:25 系列:7021 BuckPlus 输入电压:5 ~ 32V 输出电压:2.5 ~ 29.5V 电流 - 输出:700mA 功率（瓦特）:22.4W 安装类型:通孔 端接类型:PCB 引脚 尺寸/尺寸:0.83" L x 0.83" W x 0.43" H（21.1mm x 21.1mm x 10.9mm） 工作温度:-40°C ~ 80°C 类型:降压，带调光 批准:- 其它名称:788-1018 |
| LTM8040IV#PBF | 制造商:Linear Technology 功能描述:DC/DC MICRO MODULE IC |
| LTM8040IVPBF | 制造商:Linear Technology 功能描述:LED Driver 1A 36V Current Source LGA66 |
| LTM8040IV-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V, 1A μModule LED Driver |
| LTM8040V | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V, 1A μModule LED Driver |
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