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参数资料
| 型号： | LM3354MMX-4.1/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 1.10 MM HEIGHT, MSOP-10 |
| 文件页数： | 3/12页 |
| 文件大小： | 433K |
| 代理商： | LM3354MMX-4.1/NOPB |
Typical Application Circuits (Continued)
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 ILED = (4.1V VF)/RB
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.
20018840
FIGURE 4. White LED Driver
20018816
FIGURE 5. Typical Layout, Top View (magnification 1.5X)
LM3354
www.national.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM3354MMX-5.0 | 制造商:NSC 制造商全称: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 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:3.3V 输入电压:4.5 V ~ 24 V PWM 型:- 频率 - 开关:- 电流 - 输出:125mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 包装:Digi-Reel® 供应商设备封装:SOT-6 其它名称:MAX1836EUT33#TG16DKR |
| LM3355 | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
| LM33550 | 制造商:SAFT 制造商全称:SAFT 功能描述:3 V Primary lithium-manganese dioxide High power D-size spiral cell |
| LM3355MM-4.1 | 制造商:Rochester Electronics LLC 功能描述:SW CAP BUCK/BOOST PROG V@50MA - Bulk |
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