参数资料
型号: PCA9626BS,518
厂商: NXP Semiconductors
文件页数: 31/47页
文件大小: 0K
描述: IC LED DRIVER RGBA 48HVQFN
产品培训模块: LED Controllers
I²C Bus Fundamentals
标准包装: 1
拓扑: 开路漏极,PWM
输出数: 24
内部驱动器:
类型 - 主要: 背光,LED 闪烁器
类型 - 次要: RGBA
频率: 1MHz
电源电压: 2.3 V ~ 5.5 V
输出电压: 40V
安装类型: 表面贴装
封装/外壳: 48-VFQFN 裸露焊盘
供应商设备封装: 48-HVQFN EP(6x6)
包装: 标准包装
工作温度: -40°C ~ 85°C
产品目录页面: 845 (CN2011-ZH PDF)
其它名称: 568-4935-6
NXP Semiconductors
PCA9626
24-bit Fm+ I 2 C-bus 100 mA 40 V LED driver
10.1 Junction temperature calculation
A device junction temperature can be calculated when the ambient temperature or the
case temperature is known.
When the ambient temperature is known, the junction temperature is calculated using
Equation 4 and the ambient temperature, junction to ambient thermal resistance and
power dissipation.
T j = T amb + R th ? j - a ? ? P tot
where:
T j = junction temperature
T amb = ambient temperature
R th(j-a) = junction to ambient thermal resistance
P tot = (device) total power dissipation
When the case temperature is known, the junction temperature is calculated using
Equation 5 and the case temperature, junction to case thermal resistance and power
dissipation.
T j = T case + R th ? j - c ? ? P tot
(4)
(5)
where:
T j = junction temperature
T case = case temperature
R th(j-c) = junction to case thermal resistance
P tot = (device) total power dissipation
Here are two examples regarding how to calculate the junction temperature using junction
to case and junction to ambient thermal resistance. In the first example ( Section 10.1.1 ),
given the operating condition and the junction to ambient thermal resistance, the junction
temperature of PCA9626B, in the LQFP48 package, is calculated for a system operating
condition in 50 ? C 1 ambient temperature. In the second example ( Section 10.1.2 ), based
on a specific customer application requirement where only the case temperature is
known, applying the junction to case thermal resistance equation, the junction
temperature of the PCA9626B, in the LQFP48 package, is calculated.
1.
50 ? C is a typical temperature inside an enclosed system. The designers should feel free, as needed, to perform their own
calculation using the examples.
PCA9626
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 6 September 2012
? NXP B.V. 2012. All rights reserved.
31 of 47
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