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參數(shù)資料
| 型號： | LM2792LDX-H |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | Silver Mica Capacitor; Capacitance:6800pF; Capacitance Tolerance:+/- 5%; Series:CDV30; Voltage Rating:1500VDC; Capacitor Dielectric Material:Mica; Termination:Radial Leaded; Lead Pitch:11.1mm; Leaded Process Compatible:No RoHS Compliant: No |
| 中文描述： | LED DISPLAY DRIVER, DSO10 |
| 封裝： | 3 X 3 MM, 0.80 MM HEIGHT, LLP-10 |
| 文件頁數(shù)： | 9/10頁 |
| 文件大?。?/td> | 204K |
| 代理商： | LM2792LDX-H |
Application Information
(Continued)
important to have good thermal conduction with a proper
layout to reduce thermal resistance.
POWER EFFICIENCY
An ideal power efficiency for a voltage doubler switched
capacitor converter is given as the output voltage of the
doubler over twice the input voltage as follows:
Efficiency = (V
DIODE
* I
DIODE
) / ( V
IN
* I
DIODE
* Gain) =
V
DIODE
/ 2V
IN
In the case of the LM2792, a more accurate efficiency cal-
culation can be applied as the given formula below.
Efficiency = ((V
D1
* I
D1
) + (V
D2
* I
D2
)) / (I
SUPPLY
* V
IN
)
It is clear that the efficiency will depend on the supply voltage
in the above equation.As such, the lower the supply voltage,
the higher the efficiency.
POWER DISSIPATION
The maximum allowable power dissipation that this package
is capable of handling can be determined as follows:
P
DMax
= (T
JMax
- T
A
) /
θ
JA
where T
is the maximum junction temperature, T
is the
ambient temperature, and
θ
JA
is the junction-to-ambient
thermal resistance of the specified package.
The actual power dissipation of the device can be calculated
using this equation:
P
Dissipation
= (2V
IN
-V
DIODE
)
*
I
LOAD
As an example, if V
in the target application is 4.2V, V
= 3.0V and worse case current consumption is 32mA (17mA
for each diode).
P
Dissipation
= ((2
*
4.2) -3.0)
*
0.032 = 173mW
Power dissipation must be less than that allowed by the
package. Please refer to the Absolute Maximum Rating of
the LM2792.
PCB LAYOUT CONSIDERATIONS
The LLP is a leadframe based Chip Scale Package (CSP)
with very good thermal properties. This package has an
exposed DAP (die attach pad) at the center of the package
measuring 2.0mm x 1.2mm. The main advantage of this
exposed DAP is to offer lower thermal resistance when it is
soldered to the thermal land on the PCB. For PCB layout,
National highly recommends a 1:1 ratio between the pack-
age and the PCB thermal land. To further enhance thermal
conductivity, the PCB thermal land may include vias to a
ground plane. For more detailed instructions on mounting
LLP packages, please refer to National Semiconductor Ap-
plication Note AN-1187.
L
www.national.com
9
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PDF描述 |
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| LM2792LDX-L | Silver Mica Capacitor; Capacitance:7500pF; Capacitance Tolerance:+/- 5%; Series:CDV30; Voltage Rating:1500VDC; Capacitor Dielectric Material:Mica; Termination:Radial Leaded; Lead Pitch:11.1mm; Leaded Process Compatible:No RoHS Compliant: No |
| LM27953TLX | CABLE 64 COND 100FT TWISTED PAIR |
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| LM27 | SOT-23, 3 Degree Celcious Accurate, 120-150 Degree Celcious Factory Preset Thermostat |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2792LDX-L | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Current Regulated Switched Capacitor LED Driver with Analog Brightness Control |
| LM2792LDX-L/NOPB | 功能描述:IC LED DRIVR WHITE BCKLGT 10-LLP RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?PWM，切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅(qū)動器:是 類型 - 主要:背光 類型 - 次要:白色 LED 頻率:642kHz 電源電壓:2.7 V ~ 5.5 V 輸出電壓:5V 安裝類型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-VSON 包裝:剪切帶 (CT) 工作溫度:-30°C ~ 85°C 產(chǎn)品目錄頁面:1371 (CN2011-ZH PDF) 其它名稱:BD1603NUV-E2CT |
| LM2793 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Noise White LED Constant Current Supply with Dual Function Brightness Control |
| LM2793B E WAF | 制造商:Texas Instruments 功能描述: |
| LM2793LD | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Noise White LED Constant Current Supply with Dual Function Brightness Control |
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