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參數(shù)資料
| 型號(hào)： | LM2707 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | LED驅(qū)動(dòng)器 |
| 英文描述： | Inductive-Boost Series LED Driver with Programmable Oscillator Frequency |
| 中文描述： | 電感式升壓系列LED具有可編程振蕩器頻率驅(qū)動(dòng) |
| 文件頁數(shù)： | 12/19頁 |
| 文件大?。?/td> | 1039K |
| 代理商： | LM2707 |
Product Description
(Continued)
Figure 5
graphs the relationship between inductor current
and current limit.
Figure 6
plots ideal inductor current wave-
forms to illustrate inductor current behavior.
Figure 7
gives
peak inductor current versus input voltage and shows the
two regions where the oscillator and current limit, respec-
tively, determine peak inductor current.
Note 12:
V
is a good approximation of the voltage across the inductor
during the charge phase. Actual voltage across the inductor will be slightly
lower due to the V
DS
voltage of the power transistor, but this factor is minimal
due to the low R
DS-ON
of the power transistor.
INCREASING CURRENT LIMIT AND PEAK INDUCTOR
CURRENT
It is possible to increase the current limit by placing an
external resistor between the V
IN
and L
X
pins, as shown in
Figure 8
. With the addition of the external resistor, only a
fraction of the total inductor current passes through internal
sense resistor. Thus, it takes more inductor current for the
voltage across the internal sense resistor to become large
enough to trip the current limit comparator.
The addition of an external current limit resistor modifies the
associated peak inductor equation to:
R
EXT
: External Current Limit Adjust Resistance
20099231
FIGURE 5. Peak Inductor Current and Current Limit vs.
Input Voltage
20099232
FIGURE 6. Ideal Inductor Current Waveforms
20099252
FIGURE 7. Peak Inductor Current vs. Input Voltage.
L = 22μH, C
X
= 68pF.
20099233
FIGURE 8. Increase Current Limit and Peak Inductor
Current by Adding R
EXT
L
www.national.com
12
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2707MF | 制造商:Texas Instruments 功能描述:LED DRIVER WHITE POWERWISE SOT-23-8 |
| LM2707MF/NOPB | 功能描述:IC LED DRVR WHITE BCKLGT SOT23-8 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 |
| LM2707MFX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Inductive-Boost Series LED Driver with Programmable Oscillator Frequency |
| LM2707MFX/NOPB | 功能描述:IC LED DRVR WHITE BCKLGT SOT23-8 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 |
| LM2708HTLX-1.57/NOPB | 制造商:Texas Instruments 功能描述: |
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