It is the importance of customer’s feedback of green laser pointer

The chip uses 9 ~ 14V negative voltage power supply shown in Figure 3-5, the stability of the chip supply voltage VEE output constant current signal quality plays a very important role, using multiple filtering techniques, ripple control of the VEE 1mv about [10]. D6 and R7 composed of feedback loops can make the LD under constant light power mode; PIN7 enable terminal, vacant ground for normal operation then VEE chip does not output, can PIN7 external modulation source on the chip carry out modulation, access to information can be found , PIN7 3dB modulation bandwidth of about 100kHz. The PIN21 adjustment for the current client, in continuous mode, adjust the PIN21 to the VEE get voltage to the power supply output current from 0 to 1.5A continuous change. The customer can customize the laser effect of  green laser pointer  .
Modulation circuit A2 shown in Figure 3-2 of the output and ground and the PIN21 and VEE links, of the power chip, through the adjustment RW3 PIN21 amplitude modulation signal, so that the current source chip output current pulse, and adjust the RW4 can change the DC bias of the power chip output current pulse; when the regulation of the RW3 to the ground, the modulated signals from the A2 output voltage pulse amplitude is 0, the power supply in the continuous mode, the size of the output current is entirely RW4 control. The laser diode driver protection circuit design. The protection of the laser diode driver circuit is used HY5650 for over-temperature protection circuit to achieve the protection of the semiconductor laser drive power. It is the importance of customer’s feedback of  green laser pointer  .
Following a brief introduction to first HY5650 chip. HY5650 is an ultra-small thermoelectric ratio of temperature control cooler (referred to as the TEC). This device is suitable for the application of the front control panel and the digital readout is not necessary for fixed temperature of the heating or cooling. The HY5650 using a thermistor bridge to accurately measure and specification TEC comes with the device temperature. With appropriate cooling equipment, power supply will provide up to 2 amps of current to the TEC and will provide a voltage of 5-12 volts. The HY5650 the basic parameters such as Table 3-2: HY5650 the basic parameters. The HY5650 the inner workings of Figure 3-6: Figure 3-6-HY5650 the inner workings of the diagram. It is the laser effect of  green laser pointer  they want.
The semiconductor laser power fault protection mechanism so that the expensive LD array from damage. Circuit protection is a core part of the entire power supply consists of over-temperature protection, overcurrent protection, undervoltage protection, and overvoltage protection. In addition to the over-temperature protection circuit, the other protective circuit is relatively simple, the CPU via a constant current of the detection system, the voltage signal to control the power supply to run, play the corresponding protective function. LD with a number of parameters have a close relationship with its junction temperature. When the junction temperature rise of LD band gap narrowing, leading to the laser wavelength moves to longer wavelengths [11,12], the LD threshold current also increased with temperature increase. If there is no effective temperature control system. It is as per where  green laser pointer   will be used.
Constant current injection, when the LD temperature change, the output optical power will be more ups and downs. Operating temperature will affect the life of the LD, LD case temperature is increased to 30 ° C, its life is about to reduce an order of magnitude, usually the temperature of LD should be controlled within 0.05 ° C [13] in order to ensure that the current modulated LD influence of temperature will not result in serious consequences. In the past, for small and medium-sized power LD often simple passive cooling or water-cooled. These two methods the results are not very good and are unable to achieve the purpose of further temperature control, can not set the system to work in a specific temperature range, while the semiconductor thermoelectric cooler (TEC) temperature control devices have good control effect. What is the purpose of the laser effect of   green laser.