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LDC-3700B Intermittent Contact Protection

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LDC-3700B Intermittent Contact Protection

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The LDC-3700B series precision laser diode controller incorporates multiple industry leading protection features which have been developed by ILX Lightwave specifically for safely controlling laser diodes. These include slow start circuitry, a normally closed output shorting relay, adjustable current and voltage limits, and transient protection. Additionally, a fast all analog hardware feedback control loop shut-off circuit protects against overvoltage and over-current conditions which may occur due to brief open circuit conditions caused by poor cabling or fixture connections. These brief open circuit conditions are commonly referred to as intermittent contacts. The speed at which a laser diode current source detects an open circuit, and safely shuts the output off is critical to protecting the laser diode device under test. This Technical Note presents the results of measurements detailing the fast shut-off time of the LDC-3700B during an intermittent contact event. It should also be noted that the LDC-3700B offers a user programmable adjustable compliance voltage clamping protection feature. This Technical Note focuses solely on the fast feedback open circuit detection and shut-off protection circuitry.

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