参数资料
型号: LM2735YQMFX/NOPB
厂商: National Semiconductor
文件页数: 18/58页
文件大小: 0K
描述: IC REG BOOST SEPIC ADJ SOT23-5
标准包装: 3,000
类型: 升压(升压),Sepic
输出类型: 可调式
输出数: 1
输出电压: 3 V ~ 24 V
输入电压: 2.7 V ~ 5.5 V
PWM 型: 电流模式
频率 - 开关: 520kHz
电流 - 输出: 2.1A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: SC-74A,SOT-753
包装: 带卷 (TR)
供应商设备封装: SOT-23-5
其它名称: LM2735YQMFX
SNVS485F – JUNE 2007 – REVISED APRIL 2013
?
PCB variables (copper weight, thermal via’s, layers component placement).
It would be wrong to assume that the top case temperature is the proper temperature when calculating R θ JC
value. The R θ JC value represents the thermal impedance of all six sides of a package, not just the top side. This
document will refer to a thermal impedance called R ψ JC . R ψ JC represents a thermal impedance associated with
just the top case temperature. This will allow one to calculate the junction temperature with a thermal sensor
connected to the top case.
LM2735 Thermal Models
Heat is dissipated from the LM2735 and other devices. The external loss elements include the Schottky diode,
inductor, and loads. All loss elements will mutually increase the heat on the PCB, and therefore increase each
other’s temperatures.
L 1
I L t ( )
D 1
V OUT ( t )
V IN
Q 1
C 1
Figure 28. Thermal Schematic
18
Product Folder Links: LM2735
Copyright ? 2007–2013, Texas Instruments Incorporated
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