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The diode current is determined by the voltage at pin CI and by the resistors RK1 and RK2. The two fast switches are controlled independently via CMOS inputs EN1 and EN2. The laser diode can thus be turned on and off or switched between different current levels defined by the ratio of RK1 and RK2.

Applications

• – Data transmission
• – Laser scanning devices
• – Optical storage devices

Features

• – Laser switch for frequencies from CW up to 155 MHz
• – iC-HKB for driving blue laser diodes
• – Dual spike-free switching inputs with independent current control
• – Operates as a voltage-controlled current source
• – Pulsed operation with up to 700 mA per channel
• – CW operation with up to 150 mA per channel
• – Control to the average of the laser power in conjunction with iC-WK/L (CW laser diode driver)
• – Supplement to iC-WK/L for pulsed operation
• – Thermal shutdown

Each channel can be operated on 150 mA DC and up to 700 mA pulsed current depending on the frequency, duty cycle and heat dissipation.

The integrated thermal shutdown feature prevents damage from excessive temperature.

iC-HK/B supplements the laser diode driver iC-WK which uses the monitor current of the laser diode to control the laser power. iC-WK therefore controls the voltage at pin CI in such a way that the average value of the emitted laser power is constant (APC), providing there is a constant duty cycle and a switching frequency higher than 100 kHz.