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參數(shù)資料
| 型號(hào)： | LM3354MMX-3.7 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Regulated 90mA Buck-Boost Switched Capacitor DC/DC |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | MSOP-10 |
| 文件頁(yè)數(shù)： | 11/12頁(yè) |
| 文件大?。?/td> | 394K |
| 代理商： | LM3354MMX-3.7 |
Driving Light Emitting Diodes
The LM3354 can be used to drive LED’s of nearly any color.
The 4.1V option is ideal for driving the White LED’s required
for the backlight of small color displays. Figure 4 shows the
circuit used to power White LED’s. The LED current is set by
the resistors R
B
by using the equation I
LED
= (4.1V V
F
)/R
B
where V
F
is the typical forward voltage drop of the LED used.
The brightness of the diodes may be controlled using the
shutdown pin. A PWM signal on the shutdown pin may be
used to adjust the brightness by varying the duty cycle. A
signal between 60Hz and 200Hz may be used for best
linearity. In this case the equivalent LED current is approxi-
mately equal to the maximum current multiplied by the duty
cycle. Using frequencies above 200Hz may cause less linear
results as the charge and discharge time of the output
capacitor becomes more significant.
Layout Considerations
Due to the 1 MHz typical switching frequency of the LM3354,
careful board layout is a must. It is important to place the
capacitors as close to the IC as possible and to keep the
traces between the capacitors and the IC short and direct.
Use of a ground plane is recommended. Figure 5 shows a
typical layout as used in the LM3354 evaluation board.
DS200188-16
FIGURE 5. Typical Layout, Top View (magnification 1.5X)
L
www.national.com
11
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM3354-37 | Regulated 90mA Buck-Boost Switched Capacitor DC/DC |
| LM3354 | Regulated 90mA Buck-Boost Switched Capacitor DC/DC Converter |
| LM336(中文) | 2.5-V Intergrated Reference Circuits(2.5V基準(zhǔn)電壓源) |
| LM336 | 2.5-V Intergrated Reference Circuits(2.5V基準(zhǔn)電壓源) |
| LM337M | MEDIUM CURRENT THREE-TERMINAL ADJUSTABLE NEGATIVE VOLTAGE REGULATOR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3354MMX-4.1 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Regulated 90mA Buck-Boost Switched Capacitor DC/DC Converter |
| LM3354MMX-5.0 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Regulated 90mA Buck-Boost Switched Capacitor DC/DC Converter |
| LM3354MMX-5.0/NOPB | 功能描述:IC REG MULTI CONFIG 5V 10-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:125mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應(yīng)商設(shè)備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR |
| LM3355 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LM33550 | 制造商:SAFT 制造商全稱:SAFT 功能描述:3 V Primary lithium-manganese dioxide High power D-size spiral cell |
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