KEYWORDS: Power supplies, Diodes, Field effect transistors, Semiconductor lasers, Semiconductors, Capacitors, Switches, High power lasers, Switching, Transistors
According to the principle of the laser diode (LD) power supply, this paper uses the chip-MAX797 as a stabilized drivencurrent
source to design the circuit. And the output current of the source can reach 4 A, its output voltage can be
adjustable between 2.5V and 6V. The efficiency of the drive circuit is up to 96%, and the shutdown current is only
1 λA Then make the necessary analysis about the design of the circuit. The whole circuit diagram is made up of three
parts which there are an invariable driven-current source, a programmable soft-start circuit and a protection circuit of the
over current and the restrained ripple. The adapter supplies the input voltage which is between 4.5V and 30V. And it
adds a resistance to limit the current of the LD at last. The theory of this circuit's design is simple, and the function is as
much as the conventional, but its size is smaller than the conventional driven-current source. Then summarize the
advantages and disadvantages of the soft-start circuit between this paper and the traditional, and corresponding to
analysis of the components selecting, it used the preferred components in the design of the circuit. Finally, there is a
summary and expectation in high-power laser diode power supply design in the future.
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