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What is LED Constant Current Driver Power Supply?

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Led constant current driver power supply is a voltage converter that converters the power supply into a specific voltage and current to driver led light, usually: The input of the led driver power includes high-voltage power frequency AC (mains), low-voltage DC, high-voltage DC, low-voltage high-frequency AC (such as the output of electronic transformers), etc. The output of the led driver power supply is mostly a constant current source that can change the voltage with the change of the LED forward voltage drop value.
The reason why LED uses constant current driver:
1. LED is a non-liner device, a small change in forward voltage can cause a large change in forward current.
2. 1W high-power LED, if the forward voltage changes by 10% (from 3.4V to 3.1V), it will cause the forward current to decrease from 350mA to 100mA, a change of 3.5 times.
3. The light output of an LED is proportional to the forward current, if the forward current is reduced from 350mA to 100mA, the light output will be reduced by as much as 70%.
4. LED is a semiconductor diode, and its volt-ampere characteristics change with temperature (-2mV/oC).
If powered by a constant voltage power supply: When the temperature increases to 85°, the forward current increases from 20mA to 35-37mA, and the brightness does not increase, when the temperature decreases to -40°, the forward current decreases from 20mA to 8-10mA, and the brightness decreases, therefore, it cannot be powered by a constant voltage source, but must be powered by a constant current source.
The types of constant current power supply are:
1. DC in - DC out (DC - DC)
a. Boost Constant Current Driver. Such as this 9-18W (HAZ018NXN-B) led driver, boost constant current design, high efficiency, no-isolated.

b. Buck Constant Current Driver. Such as this 28W (HZZ028NVN) led driver, buck and constant current design, support reduced voltage dimming, smooth dimming, pay attention to the output voltage must be lower than the input voltage 3-5V.

c. Buck-Boost Constant Current Driver. Such as this 24W (HZZ024NVN) led driver, buck-boost constant current design, support 0-10V, PWM, R dimming, smooth dimming.

2. AC input DC output (AC - DC)
a. Non-isolated (in certain circumstances, meet the safety requirements). Such as this 50W (HZD050CXN) led driver, non-isolated, constant current design, high PF, stable performance, in line with CE/EMC/FCC/ROSH and other standards.

b. Isolated (meet the safety requirements). Such as this 36W (HZD036CXI) led driver, isolated constant current design, high PF, no-flicker, using long-life surface electrolytic capacitors, in line with CE/FCC/ROSH and other standards.

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What is LED Constant Current Driver Power Supply?

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