求一个12V输入，3 LED（1A）的台灯调光电路

aimesonic

你的LED是串联还是并联啊？看看我的那个电子开关的！

xxc3235797

LDCH   V1.0   不用12伏输入  8.4伏就够了

xmdzshz

CN系列，接3串LED，可调电阻无级调光，不闪烁。
外围及其简单，注意做好CN5611自身散热。
CN5611最大800mA，CN5612最大1.2A，CN5911最大1A。

xmdzshz

LM317，也很简单。

xmdzshz

2锂电最多8.4V，推不动3串LED，那就只能并联了，但并联往往某一个LED死得快。

AX2002.part1.rar.tif (146.48 KB, 下载次数: 20)

2010-10-28 13:52 上传

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AX2002.part2.rar.tif (62.77 KB, 下载次数: 11)

2010-10-28 13:52 上传

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ak47fans

AX2002是什么电路？怎么能实现调光，我能不能用三个AX2002实现3个LED调光，最高1A输出？
lgfsm 发表于 2010-10-28 13:36

                               
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用一片AX2002调光电路就可以援推三串的LED.

xmdzshz

AX2002.part2.rar.tif (62.77 KB, 下载次数: 13)

2010-10-28 14:29 上传

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AX2002.part1.rar.tif (146.48 KB, 下载次数: 14)

2010-10-28 14:29 上传

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xmdzshz

晕死，神马论坛，传几遍附件还是传不上{:1_250:}

xxc3235797

2锂电最多8.4V，推不动3串LED，那就只能并联了，但并联往往某一个LED死得快。

396649

396650
xmdzshz 发表于 2010-10-28 13:51

                               
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如果2锂电+V1.0推不动3串联LED  那M9X的存在岂不是不合乎逻辑呢？哈哈哈

xmdzshz

如果2锂电+V1.0推不动3串联LED  那M9X的存在岂不是不合乎逻辑呢？哈哈哈
xxc3235797 发表于 2010-10-28 14:30

                               
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汗一个，AX2002是自动升降压的吗？没玩过，想当然了{:1_245:}

xmdzshz

2A, 0.25V Feedback Voltage Step-Down
Switching Regulators for LED Driver

GENERAL DESCRIPTION
AX2002 consists of step-down switching regulator with PWM control. These
devise include a reference voltage source, oscillation circuit, error amplifier, internal
PMOS and etc.
AX2002 provides low-ripple power, high efficiency, and excellent transient
characteristics. The PWM control circuit is able to the duty ratio linearly from 0 up to
100%. An enable function, an over current protect function and short circuit protect
function are built inside, and when OCP or SCP happens, the operation frequency
will be reduced. Also, an internal compensation block is built in to minimum external
component count.
With the addition of an internal P-channel Power MOS, a coil, capacitors, and a
diode connected externally, these ICs can function as step-down switching regulators.
They serve as ideal power supply units for portable devices when coupled with the
SOP-8L package, providing such outstanding features as low current consumption.
Since this converter can accommodate an input voltage up to 23V, it is also suitable
for the operation via an AC adapter.

FEATURES
- Input voltage：3.6V to 23V
- Output voltage：0.25V to Vcc
- LED Backlight and High Power LED Application
- Duty ratio：0% to 100% PWM control
- Oscillation frequency：330KHz typ.
- Enable/Disable function.
- Current Limit (CL), Thermal Shutdown and Short Circuit Protections (SCP).
- Built-in internal SW P-channel MOS.
- Low ESR output capacitor (Multi-layer chip capacitor (MLCC)) application.
- SOP-8L Pb-Free package.

PDF上没说能升压啊？

xmdzshz

论坛怎么就是看不到图片，可否麻烦发封邮件，lgfsm@126.com
lgfsm 发表于 2010-10-28 14:36

                               
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已发送，请查收。

artie

用单片机好，加个定时关灯的功能，很实用的