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QUESTION

  • I am designing a laser driver circuit using the WLD3343. On page 8 of the data sheet there is a discussion about choosing R(LIM). Apparently, R(SENSE) sets the allowable current range of the laser driver, and R(LIM) then limits the actual current limit to something less than what R(SENSE) allows. The first paragraph says "Divide the maximum laser diode current (determined in Section 1) into the desired maximum operating current for your laser diode." Following the interpretation above, that means dividing a larger number into a smaller number, which is greater than 1. Following example 1, I believe that I want the reciprocal of that number. Are these correct interpretations?

ANSWER

Your interpretation is correct. See the Method 1 section on page 11 of the WLD3343 Datasheet for an example of how to use the normalized maximum output current to calculate RLIM.

Alternatively, you can use Equation 7 along with Table 4 on page 11 of the datasheet to calculate the current limit resistor value in a slightly more precise way.

Additionally, you can use the online WLD Circuit Calculator to automatically determine values for external components.

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