老外对LD-29的评测，很详细啊
http://lygte-info.dk/review/DriverTest%20LD-29%202.8A%201-2%20Cell%20UK.htmlReview/test of LD-29 2.8A 1/2 Cell Circuit board
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/DSC_3699.jpg http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/DSC_3700.jpg
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/DSC_3701.jpg http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/DSC_3705.jpg
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/DSC_3741.jpg
Driver is from Intl-outdoor.com, but he does not sell it anymore.
Official specifications:
[*]Suitable for 1 or 2*18650 or 26650 batteries
[*]Input voltage: 3-8.4V
[*]Current and Modes:
[*]High (2.8A) - Medium (700mA) - Low (100mA) - Strobe - SOS
[*]High (2.8A) - Medium (700mA) - Low (100mA)
[*]Current on High with 1 cell 2.5-2.6A
[*]Constant current circuit (2 cell only)
[*]Memory function
[*]This driver does not use PWM
[*]PCB Diameter: 18.5mm
[*]Contact board diameter: 20.3mm
[*]Total height: 8.9mm
[*]Gold plated contacts
[*]Low voltage protection 1 cell: at 3V the light will step down to low mode and start flashing
[*]Low voltage protection 2 cells: at 5.8V the light will step down to low mode and start flashing
[*]Reverse polarity protection
[*]Tinned leads
You can change between the set of modes by turning on the flashlight on low mode for about 3 seconds,the light will flash once, then quickly turn off the flashlight and then turn it on.
Measurements
Tested with XM-L2
Diameter 18.5 mm & 20.2 mm
Max. height: 9.3 m
Strobe 15 Hz 44% on time
Mode set 1: High, medium, low, Strobe, SOS
Mode set 2: High, medium, low
When doing a low to high test the led did not turn on.
The driver has memory, the actual mode is stored when the light is off for a short time.
A off/on will select next mode, the off has to be rather long, not to select next mode.
The driver can be used with 1 or 2 LiIon batteries in series.
The low voltage warning only works with 2 batteries.
High
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%20HL%208.4V.png
The drivers has very good regulation and good efficiency. It turns down power at 6.5 volt and battery warning comes on at 5.8 volt.
As usual efficiency and power calculations are wrong when the light is flashing.
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%20HL%208.4VDriver.png
There is a maximum of 1.6 watt lost in the driver.
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%20HL%208.4VLed.png
And a bit above 9 watt to the led.
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%20HL%205.0V.png
With one cell, the stabilization is not that good (Led current varies between 3 and 4 volt).
The driver drops to medium mode at about 3.3 volt, this is good for keeping the led on.
There is no low voltage protection, but the driver turns off at 2.5 volt, i.e. minimum voltage for 2900/3100/3400 Panasonic cells.
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%20HL%205.0VDriver.png
With one cell the loss in the driver is slightly lower.
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%20HL%205.0VLed.png
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%207.2V.png
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%203.6V.png
The output does not contain any noise.
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%20Warning.png
The low voltage warning is slow (2 sec cycle) flashing on the led.
Medium
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%20HL%208.4V%20medium.png
Medium has the same good stabilization and does not step down, it goes directly to low battery warning at 5.8 volt.
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%20HL%208.4V%20mediumDriver.png
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%20HL%208.4V%20mediumLed.png
The led power is 2 watt.
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%20HL%205.0V%20medium.png
With lower led power, the driver can sustain the medium level down to about 3.1 volt and it has very good efficiency.
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%20HL%205.0V%20mediumDriver.png
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%20HL%205.0V%20mediumLed.png
Also with one cell the led drive level is 2 watt.
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%207.2V%20medium.png
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%203.6V%20medium.png
Again a very smooth output, no traces of any pwm or driver regulation.
Low
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%20HL%208.4V%20low.png
On low the regulation is also good, the efficiency is slighty down.
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%20HL%208.4V%20lowDriver.png
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%20HL%208.4V%20lowLed.png
The led power is about 0.3 watt.
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%20HL%205.0V%20low.png
With a single cell the driver works down to about 2.8 volt, before brightness drops of.
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%20HL%205.0V%20lowDriver.png
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%20HL%205.0V%20lowLed.png
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%207.2V%20low.png
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%203.6V%20low.png
Again a very smooth output, no traces of any pwm or driver regulation.
Strobe
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%207.2V%20strobe.png
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%203.6V%20strobe.png
The strobe is at 15 Hz and the brightness depends on the batteries voltage (The driver cannot reach full brightness with 3.6 volt).
SOS
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%207.2V%20sos.png
http://lygte-info.dk/pic/DriverTest/IO/LD-29%202.8A%201-2%20Cell%20Circuit%20board/LD-29%202.8A%201-2%20Cell%203.6V%20sos.png
With SOS it is the same.
Conclusion
The driver is a very good stabilization (Except on high with 1 cell) and good efficiency. The mode change could be better.
There is also very little space for mounting of the two led wires.
Notes
How do I test a led driver
List of all tested drivers
谷歌翻译的鸟文
图好大·········· 看不懂啊！ 电路做工有些粗糙，评测看起来很专业的样子 老外使用了示波仪测试。 看不懂外文。 怎么都是洋字码 这是个线路板驱动的测试。 鸟文 路过路过 无奈！不懂“鹰”文，白费楼主一片苦心 那么好的评测，你们通通都把它浪费了
这种先天性缺憾是你们的通病哈哈 嘿嘿这款电路我还是有的 呵呵确实很好 很好 很好
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