LED dedicated wide voltage linear constant current driver (constant current transistor)
The constant current transistor is a device that supplies a constant current to the LED circuit, making the circuit simple, economical, and reliable. LED triodes have a constant current over a range of voltages. With a negative temperature coefficient, the LED is protected from thermal runaway at extreme voltages and operating temperatures.
The linear constant current transistor is the best product with constant current in a wide voltage. It is small in size and is packaged with TO-92 (ordinary in-line triode), SOT-89-3, and SOT-223. The constant current transistor only needs to be used. Ensure that the input voltage minus the total voltage of the LED string does not exceed 90V (maximum input-output voltage), which can completely replace the complicated and cumbersome constant current source circuit, which is very suitable for small-sized LED lamp products. Low cost, simple structure and reliable life.
The LED constant current device does not need external components, and can be directly applied to the 120/220Vac AC power supply circuit. After the 120/220Vac AC mains input is bridge rectified, only the input voltage is required to be subtracted from the total voltage of the LED string. The voltage does not exceed the constant current transistor input-output 90V.
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