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Semiconductor light-emitting diode (LED) is known as a new light source in the 21st century. The essence of LED is still a diode. As a nonlinear device, when the power is applied, as long as the voltage is slightly larger, its current will be It will increase a lot, so the slight instability of the voltage will greatly affect the use of the LED, and even cause it to heat damage when the current is too large. The constant current source is a power supply converter similar to the regulated power supply. It can keep the current constant when applied to the LED. Even when the voltage, ambient temperature, and the discreteness of the LED's own parameters change, the LED can be made. The indicators have reached an ideal situation, giving full play to the various excellent characteristics of LEDs.
There are two types of constant current sources currently used: one is a linear power supply improvement type, and the other is a switching power supply form. Both of these circuit forms are complicated, the linear loss is large, the range is small, and the reliability of the switching power supply form is poor, the adaptation range is small, and the cost is high. Recently, a new constant current source introduced by Shenzhen Guanghuayuan Technology has changed the above shortcomings. Its constant current range is from 10 mA to 60 mA. It has the following characteristics:
The ASIC part is only 11*8*4 (length, width and height unit: mm). The external circuit is simple, and various shapes and sizes can be produced according to customer requirements. The product does not have heat, and there is no problem for long-term use, and the reliability is high. EMC features from 1 LED to 110 LEDs (according to VF = 2V, Vi = 200V) do not need to change any lines, easy to use. Products from 85V to 240V, frequency 50/60HZ can be used, no need to change the wiring, no need to increase or decrease any components. Good stability, high precision, guaranteed use of parameters over a wide range of voltages and temperatures. At present, there are three types of new constant current sources: IC HA22002P, IC HA22004P, and IC HA22006P. IC HA22004P has been well evaluated by downstream application customers. This chip is mainly used in series LED power supply, each string of LEDs. The number of series can reach up to 110. The input voltage of the chip is AC 85V ~ 240V, the output is a constant current, and the constant current value can be preset by the customer. The external circuit of the chip is simple, no inductance, no transformer, so all the circuit components, small size, can be embedded inside the small-volume LED lamp. In this way, for the sealing of LED products, the waterproof and moisture-proof packaging problems will become more and more easy. Features input voltage range: 85V AC ~ 240V AC. (Must be AC ​​input) Constant current range: 10mA ~ 40mA (by external setting); Temperature range: -40 °C ~ 85 °C Accuracy: A, B, C Level III: ± 2.5%; ± 5%; ± 10% Efficiency: 95% LED series range: n ≤ 0.9V inDC /VF, where n is the number of single LEDs in series, V inDC is the input rectified voltage, and VF is the forward voltage drop of each LED. Volume: DIP-10 package. Good stability, cost-effective, and guaranteed parameters over a wide range of voltages and temperatures. Good EMC characteristics Applicable products All LED light fixtures Spotlights, desk lamps, guardrail lights Decorative lighting and bulbs LCD flat panel display backlights Other LED drivers that do not need to be isolated from the power supply
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