描述：
LDX-3412 型为激光二极管和 LED 的通用驱动提供低成本解决方案。这种精密的 0-200 mA 电流源可在恒流和恒光操作模式下提供稳定、低噪声的输出。直观的前面板和具有 0.1 mA 分辨率的高可见度 LED 显示屏确保了易于使用的操作。创新的电压源/恒流输出级设计使操作可靠。还包括激光二极管保护电路，以及用户可调节的光电二极管反馈功能。
LDX-3412 具有三种操作/显示模式： (1) 恒流，可在高达 6 V 的情况下提供 0-200 mA 的稳定、精确电流；(2) 恒功率，可通过光电二极管反馈信号控制电流输出，保证光输出电平恒定（尽管温度变化）；(3) 极限显示，可以方便地显示当前极限设定点水平。
LDX-3412 采用独特、安全的输出、关/开开关技术，其中单元的输出端子由创新的半导体开关分流。当输出开关启用时，通过将分流器缓慢切换到高阻抗状态来安全打开输出。当输出开关关闭时，通过将半导体分流器件快速返回到低阻抗状态来禁用源的输出，从而在抑制潜在破坏性电流瞬变的同时使输出端子短路。该装置还采用了双屏蔽变压器。这种屏蔽降低了交流线路噪声并抑制了破坏性的线路瞬变。轻松连接到任何激光器/LED 封装样式 LDX-3412 的输出端子是完全浮动的，如有必要，允许任一侧接地。对于恒功率运行，仪表放大器用于设备的外部监控光电二极管输入端。这允许连接到任何激光器/LED 封装引脚配置。
LDX-3412 还采用了经过验证的电流限制电路。该电路对于仪器的主要精密电流控制是完全冗余的。这种方法允许安全地设置电流限制，即使该单元正在以较低的电流水平主动驱动激光器。此外，电流限制与输出顺从电压无关，可在一系列负载条件下提供稳定控制。
LDX-3412 提供低噪音和高稳定性。输出宽带噪声小于 0.01% (1mA) rms，温度系数稳定性优于 100 ppm/°C。LDX-3412 在 30 分钟内（典型值）产生的输出电流漂移小于 20 ppm，优于典型的低成本电源。此外，电流限制与输出顺从电压无关，可在一系列负载条件下提供稳定控制。
特征：
Description:
Model LDX-3412 delivers a low cost solution for general purpose driving of laser diodes and LEDs. This precision 0-200 mA current source delivers stable, low-noise output in both constant current and constant light operating modes. Easy-to-use operation is assured via an intuitive front panel with a highly-visible LED display featuring 0.1 mA resolution. The innovative Voltage Source/Constant Current output stage design makes operation dependable. Laser diode protection circuits also are included, along with user-adjustable photodiode feedback capability.
The LDX-3412 features three operating/display modes: (1) Constant Current, which delivers a stable, precision current of 0-200 mA at up to 6 V; (2) Constant Power, in which a photodiode feedback signal can be used to control the current output to ensure a constant light output level (despite varying temperature); and (3) Limit Display, in which the current limit setpoint level is conveniently displayed.
The LDX-3412 employs a unique, safe output, off/on switch technology, in which the output terminals of the unit are shunted by an innovative semiconductor switch. When the output switch is enabled, the output is turned on safely by slowly switching the shunt to a high impedance state. When the output switch is turned off, the output of the source is disabled by quickly returning the semiconductor shunting device to a low impedance state, thereby shorting the output terminals while suppressing potentially damaging current transients. The unit also employs a double-shielded transformer. This shielding reduces AC line noise and suppresses damaging line transients. Easy Connection to Any Laser/LED Package Style The output terminals of the LDX-3412 are fully floating, allowing either side to be grounded if necessary. For constant power operation, an instrumentation amplifier is used at the unit's input from the external monitor photodiode. This allows connection to any laser/LED package pin configuration.
The LDX-3412 also employs a proven current limit circuit. This circuit is fully redundant to the main precision current control of the instrument. This approach allows the current limit to be set safely, even while the unit is actively driving a laser at a lower current level. Additionally, the current limit is independent of the output compliance voltage, providing stable control over a range of load conditions.
The LDX-3412 offers low noise and high stability. Output broadband noise is less than 0.01% (1mA) rms, and temperature co-efficient stability is better than 100 ppm/°C. With a resulting output current drift of less than 20 ppm over a 30 minute period (typical), the LDX-3412 out-performs typical low cost power supplies. Additionally, the current limit is independent of the output compliance voltage, providing stable control over a range of load conditions.
Features:
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