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參數(shù)資料
| 型號： | LM2793 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Low Noise White LED Constant Current Supply with Dual Function Brightness Control |
| 中文描述： | 低噪聲恒定的白光LED亮度控制雙重功能的電流供應(yīng) |
| 文件頁數(shù)： | 4/10頁 |
| 文件大?。?/td> | 211K |
| 代理商： | LM2793 |
Electrical Characteristics
(Notes 2, 8)
(Continued)
Note 5:
The human-body model is a 100 pF capacitor discharged through a 1.5 k resistor into each pin. The machine model is a 200pF capacitor discharged directly
into each pin.
Note 6:
Maximum ambient temperature (T
A-MAX
) is dependent on the maximum operating junction temperature (T
J-MAX-OP
= 100
o
C), the maximum power
dissipation of the device in the application (P
D-MAX
), and the junction-to-ambient thermal resistance of the part/package in the application (
θ
JA
), as given by the
following equation: T
A-MAX
= T
J-MAX-OP
- (
θ
JA
x P
D-MAX
). The ambient temperature operating rating is provided merely for convenience. This part may be operated
outside the listed T
A
rating, so long as the junction temperature of the device does not exceed the maximum operating rating of 100
o
C.
Note 7:
Junction-to-ambient thermal resistance is highly application and board-layout dependent. In applications where high maximum power dissipation exists,
special care must be paid to thermal dissipation issues. For more information on these topics, please refer to the
Power Dissipation
section of this datasheet.
Note 8:
All room temperature limits are 100% tested or guaranteed through statistical analysis. All limits at temperature extremes are guaranteed by correlation
using standard Statistical Quality Control methods (SQC). All limits are used to calculate Average Outgoing Quality Level (AOQL). Typical numbers are not
guaranteed, but do represent the most likely norm.
Note 9:
Maximum LED voltage (V
) is highly dependent on the application’s minimum input voltage and the amount of current flowing through the LEDs. Maximum
LED voltage for a given application can be approximated with the following equations:
V
IN-MIN
<
3.0V: V
Dx-MAX
= (1.5 x V
IN-MIN
) - (I
DX
x 25 mV/mA) - (3.5
x 2 x I
DX
)
V
IN-MIN
≥
3.0V: V
Dx-MAX
= 4.3V - (I
DX
x 25 mV/mA)
The equations above assume LEDs are connected to outputs D
and D
, and no current drawn from the charge pump output (P
). For a more precise and
thorough analysis of maximum LED voltage, please refer to text sections of the datasheet (to appear in future datasheet revisions - in the interim, please contact
National Semiconductor for more information).
Note 10:
Current sources are connected internally between P
and I
. The voltage across each current source, [V(P
) - V(I
)], is referred to as headroom
voltage. For current sources to regulate properly, a minimum headroom voltage must be present across them. Minimum required headroom voltage is proportional
to the current flowing through the current source, as dictated by this equation: V
HR-min
= 400mV x (I
Dx
/ 16mA).
Block Diagram
20063601
L
www.national.com
4
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| 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 |
| LM2793LD/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(dòng)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(dòng)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 |
| LM2793LDEV | 功能描述:電源管理IC開發(fā)工具 LM2793L EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM2793LDX | 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(dòng)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(dòng)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 |
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