Design of constant-current source for high power semiconductor laser diode
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Received Date:
2011-05-03
Accepted Date:
2011-06-03
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Abstract
In order to satisfy high power and high stability requirements of the laser K98SA3F-30.00W-R(operating current 12A,ripple coefficient requirement 0.05%),a constant-current source circuit was designed.Its output current can realize high efficiency,high precision and high stability by the chip LTC1625,LT1620,MOSFET IRF7811,digital potentiometers AD5231 and a π-type filter.The LTC1625 is a current mode synchronous step-down switching regulator and the LT1620 is a current sense amplifier.The simulation results given by LTspice Ⅳ show that,when working in constant-current mode,the output current can be changed continuously from zero to 20A,the minimum variable stepping current value is 0.061A,the output current ripple coefficient of the circuit can be less than 0.001%.Results indicate the circuit can meet the application requirements of the semiconductor laser diode K98SA3F-30.00W-R.
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