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LDDEVALP 데이터시트(PDF) 9 Page - Wavelength Electronics, Inc. |
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LDDEVALP 데이터시트(HTML) 9 Page - Wavelength Electronics, Inc. |
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9 / 28 page ![]() © 2025 www.teamWavelength.com 9 LDD P SERIES LASER DIODE DRIVER GROUNDING Some laser diode packages short either the laser diode anode or cathode to the case, which may connect the laser electrically to earth ground. Review the internal connections of the LDD P to make sure ground loops are not inadvertently created by this situation. Special attention to the details of grounding will ensure safe operation. Unless Earth and Instrument Ground are connected via the power supply, Instrument Ground is floating with respect to Earth Ground Earth Ground on USA 115 VAC wall socket Common or Instrument Ground EARTH DC POWER SUPPLY - + WIRING THE LDD P SERIES FOR CONSTANT CURRENT OPERATION Figure 5 through Figure 7 give the wiring diagrams to operate the different LDD P models in Constant Current mode. To simplify wiring, use evaluation board LDDEVALP. Setup diagrams are found on page 14. Recommended TesT Loads Figure 5 illustrates how to create a constant current simulated load for the LDD P Series laser diode drivers. The simulated load allows the configuration of the LDD P without intially connecting the laser diode. Once the laser diode driver is adjusted to the correct output current and laser diode limit current, power it down before connecting a laser diode. LD ANODE FEEDBACK LD CATHODE 7 6 5 LDD 1P MODELS 1N4001 1N4001 LDD 2P MODELS TO PIN 1 LD CATHODE FEEDBACK LD ANODE 7 6 5 1N4001 1N4001 Rail-to-rail Op-amp 1 Ω, 0.25 W 1 Ω, 0.25 W TO Figure 5. The test loads shown above simulate a constant current load for the LDD P Series Laser Diode Drivers. |
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