Log in or register to post comments. There is nothing in the datasheet to hint that the current sink can switch in kHz range usually required in lighting control. So I could be very wrong on this. Why do you say that lower than 5KHz will produce visible flicker? It did not seem to make any huge difference. Would the response be faster if the pwm voltage is 3.
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Does a Hz monitor produce any flicker — no. Wmc7135 some of what we are doing will lead to better, tougher, longer lasting harder driven emitters for tomorrow…. Does the qty of chips need to be even or odd numbered or is there an optimum number? I had though the modes might be affected by the chips. Modes are not affected by quantity of chips.
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To see how this relates to brightness, you can approximate by using this graph: Off to the races! The luminous output with relation to current is logarithmic, but I wasn’t talking about output, I was talking about efficiency.
The light I saw at has different configs available and those I mentioned above has 2 groups and can be switched to 3 modes or 5 modes. Does it mean regardless of modes, I am better off getting a light with less chips amc77135 I want longer runtimes instead of using one with more chips at medium and low modes? AMC chips are current limiters.
Is it recommended to do this? That is not a good way to drive the AMC as lee brightness will suddenly decrease in the lower ranges of duty cycle.
See “exponential decay” or “radioactive decay”. This will ensure smooth brightness control over all duty ranges, as well as good enough precision of PWM control even on slow microcontrollers. How fast can you run the PWM? If you make the frequency so high that the current sink cannot turn on properly, you will lose on your full potential power that can be delivered to the LED, i. Here is the test circuit I used to check how long it takes for the circuit to draw a stable mA through the LED:.
Thanks for the info.
Tag: LED Driver chip AMC 7135
This should tell you that you do not want the amf7135 anywhere close to these time periods. Assuming that the supply voltage is under 6V, the setup can drive a single 1W white power LED easily with minimal component count and no current sense resistor. Heat will be your enemy.
That is, Turn-on time: Your email address will not be published. Odd or even number of chips is irrelevant.
Apologies for my terrible drawing skills! But what if he eats the whole bag? It partly depends on the programming of the driver. But this should be sufficient to get the point across. Not caring about the settling time of the current sink will cause loss of total effective power delivered to the LED.
Not only do we not have that we insist on putting them within a few mm of a powerful heat source. Good ,ed know, thanks guys!
Please look at the chart I posted above, and pay attention to what it means. Perhaps some of what we are doing will lead to better, tougher, longer lasting harder driven emitters for tomorrow… Off to the races! According to the graph posted by ChiggerPepi: