欢迎访问ic37.com |
会员登录 免费注册
发布采购

EUP2794JIR1 参数 Datasheet PDF下载

EUP2794JIR1图片预览
型号: EUP2794JIR1
PDF下载: 下载PDF文件 查看货源
内容描述: 白光LED驱动器, 1X /1.5X高效率电荷泵 [White LED Driver with 1X /1.5X High-Efficiency Charge Pump]
分类和应用: 驱动器
文件页数/大小: 13 页 / 444 K
品牌: EUTECH [ EUTECH MICROELECTRONICS INC ]
 浏览型号EUP2794JIR1的Datasheet PDF文件第5页浏览型号EUP2794JIR1的Datasheet PDF文件第6页浏览型号EUP2794JIR1的Datasheet PDF文件第7页浏览型号EUP2794JIR1的Datasheet PDF文件第8页浏览型号EUP2794JIR1的Datasheet PDF文件第9页浏览型号EUP2794JIR1的Datasheet PDF文件第10页浏览型号EUP2794JIR1的Datasheet PDF文件第11页浏览型号EUP2794JIR1的Datasheet PDF文件第13页  
EUP2794  
Power Dissipation  
The power dissipation (PDISSIPATION) and junction  
temperature (TJ) can be approximated with the  
equations below. PIN is the power generated by the  
1.5x charge pump, PLED is the power consumed by the  
LEDs, PPOUT is the power provided through the POUT  
pin, TA is the ambient temperature, and θJA is the  
junction-to-ambient thermal resistance for the  
QFN-16 package. VIN is the input voltage to the  
EUP2794, VDX is the LED forward voltage, IDX is the  
programmed LED current, and IPOUT is the current  
drawn through POUT  
.
P
=
= P P  
IN LED  
P  
POUT  
DISSIPATION  
1.5× V 41  
[
×
(
+ I  
)]  
(
1.5× V × I )  
IN DX  
POUT  
× θ  
IN POUT  
T = T  
+
(P  
)
J
A
DISSIPATION  
JA  
Figure 7. Efficiency vs VIN  
4 LEDS, VLED=3.4V,ILED=15mA  
The junction temperature rating takes precedence  
over the ambient temperature rating. The EUP2794  
may be operated outside the ambient temperature  
rating, so long as the junction temperature of the  
device does not exceed the maximum operating rating  
of 100°C. The maximum ambient temperature rating  
must be derated in applications where high power  
dissipation and/or poor thermal resistance causes the  
junction temperature to exceed 100°C.  
Figure 8. PIN vs VIN  
4 LEDS, 2.5VDX 3.4V, IDX=15mA  
DS2794 Ver0.5 Mar. 2006  
12