Description of driver chip power supply in chip test temperature control system
The chip test temperature control system is mainly for the cold heat source test equipment for various drive chips. Before the operation of the Wuxi Guanya chip test temperature control system, the user needs to know the power of the drive chip.
In general, constant current drive and constant voltage drive are the two main choices in drive selection. In fact, in terms of the development status of LED power supply, these two modes are currently common drive modes on the market, LED drive power supply. Chip constant voltage type, when the parameters in the voltage regulator circuit are determined, the output voltage is fixed, and the output current changes with the increase or decrease of the load. The constant voltage circuit is not afraid of the load open circuit, but the load is completely short-circuited. . The LED is driven by a voltage-stabilized driving circuit, and each string needs to be coupled with a suitable resistor to make each string of LEDs display brightness average, and the brightness is affected by the rectified voltage change.
The constant voltage drive mode of the electric drive source, this drive mode can sample the output voltage at the load end, and the linear stabilized power supply feedback loop is a typical constant voltage control application. This method is also an LED drive mode. When an LED power supply uses a constant voltage drive mode, its method of controlling the LED forward current is to use the LED V-I curve, using a voltage supply and a rectifying resistor to determine the voltage that is required to be supplied to the LED to produce the expected forward current. The output current of the driving power supply ic constant current driving circuit is constant, and the output DC voltage varies within a certain range according to the magnitude of the load resistance value, the load resistance value is small, the output voltage is low, and the load resistance value is larger. The higher the output voltage, the constant current circuit is not afraid of load short circuit, but the load is completely open. It is desirable to drive the LED with a constant current drive circuit, but it is relatively expensive. It is necessary to adjust the load current with the constant current and the voltage. It is necessary to monitor the load current change state and monitor the load voltage. For the current development direction of the power supply design, for different LED lighting devices, the constant current drive circuit is selected. Or choose a constant voltage drive circuit, first need to consider the characteristics of the LED light source.
After the power supply is selected, it is necessary to select a suitable chip test temperature control system. The chip test temperature control system is applied to various drive chips. In order to better test the chip, the reliable manufacturer is guaranteed to ensure the chip test temperature control system. run.
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