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IC-WJSO8 Datasheet(PDF) 6 Page - IC-Haus GmbH |
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IC-WJSO8 Datasheet(HTML) 6 Page - IC-Haus GmbH |
6 / 12 page iC-WJ, iC-WJZ LASER DIODE DRIVER Rev C1, Page 6/12 APPLICATIONS INFORMATION Laser Power Adjustment The iC-WJ and iC-WJZ devices can be adapted to CW laser diodes from approximately 2 to 40 mW. N- and M-type models can be used. The pin ISET is used for the adjustment to the sensi- tivity of the monitor diode and to set the desired optical laser power. The setpoint for the averaging control of the monitor diode current is preset at this pin. MD LD +5 V DRIVER INPUT POWER DOWN THERMAL WATCHDOG REFERENCE REF VCC REF 1 2 3 4 470 nF CI RSET 74HCxx 100 uF C1 AMD 7 ISET 4 GND 1 IN 6 CWD 2 CI 3 VCC 5 KLD 8 SHUTDOWN iC−WJ/WJZ 1:1 iC−WJ 1:3 iC−WJZ R1 12 Ω C3 2 nF Figure 1: Operation of a laser diode according to the example To calculate the current required at ISET, the average optical laser power is to determine: Pav = Ppeak ∗ twhi T with peak value Ppeak and pulse/period duration twhi /T . twhi T twlo Figure 2: Duty cycle Example iC-WJ Laser diode with 5 mW maximum optical output, mon- itor diode with 0.13 mA/mW, pulse duty factor set to 20 % with Ppeak = 5 mW: The resulting average optical power is 1 mW and the average monitor diode current is 0.13 mA. The resistor RSET is calculated as: RSET = CR1 ∗ V (ISET ) Iav (AMD) = 1 ∗ 1.22 V 0.13 mA = 9.4 k Ω with the Electrical Characteristics No. 301 for V(ISET) and No. 108 for current ratio CR1. Example iC-WJZ Laser diode with 5 mW maximum optical output, mon- itor diode with 0.75 mA at 3 mW, CW operation (pulse duty factor 100 %) with Pcw = 1 mW: |
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