JY2412 Soft-Start Technology Constant-Current LED Driving IC

JY2412 Soft-Start Technology Constant-Current LEDDriving ICFigure 1a Typical application circuitFigure 1b Typical application circuitOverviewJY2412 LED constant-current driving IC is the updated version of JY2410es series.It is specially designed for low-power lighting products such as LED bulb, LED tube, ceiling lamp and down lamp to meet their features and requirements.JY2412 is based on JY2411 and added another constant-current driving module. JY2412 has two channel A, B. Here, channel A with internal MOS power tubes (600V) which enables the output a maximum current of 80 mA. Channel B uses external MOS to drive. These two channel has their own current sampling ports and can work independently.In addition to the excellent electrical performance of JYxxxx series, JY2412 has also used our company’s latest LED soft-start patented technology. At the power-on moment, the beginning current is only 20% of the working current. Then it increases generally to 100% in 5s. Such soft-start technology can thoroughly avoid the impact to the LED lighting sources resulted by the power-on peak current and can extend the LED’s service life.Pin definitionProduct featuresJY2412 integrates two independent linear constant-current modules, external remote controlling connecting module, external PMW dimming module, temperature controlling module, etc. It is suitable for the design of high voltage non-isolated LEDdrivers. A channel uses internal MOS tubes which can offer a maximum current of 80mA and meet the requirement of the low-power products. B channel uses external MOS tubes which can be adjusted and replaced flexibly according to the customers’ requirements and can drive a current more than 150mA and a power over 100W. JY2412 has various practical features, simple peripheral circuits and high reliability.Functions●Power-on soft-start technology to avoid current shock to LEDJY2412 has also used our company’s latest LED soft-start patented technology. At the power-on moment, the beginning current is only 20% of the working current. Then it increases generally to 100% in 5s. Such soft-start technology can thoroughly avoid the impact to the LED lighting sources resulted by the power-on peak current and can extend the LED’s service life.●External sensor controlling portJY2412 offers an external sensor controlling port HAL which can connect with sensors or timers. When HAL is set 0V, the output current will decrease to 50%. This function can be applied in street lamps as timing switch to decrease the power in the time after midnight to save energy. It can also be used in hotels, hospitals, parks and others with connecting to sensors which deceases the power if no people or cars passing by to save energy and extend the lamps’ life.●External PWM dimming portJY2412 offers an external PWM dimming port DIM. The maximum peak voltage of the input impulse signals is 5V. The output current would be changed by changing the input impulses’ widths. The DIM port can connected with any MCU and other intelligent control modules to realize the functions of intelligent controlling or mobile phones’ APP contr olling.●Intelligent temperature protectionJY2412 has the function of intelligent temperature controlling. When the chip junction temperature reaches 100℃, the chip would decrease the output currentautomatically. When the chip junction temperature reaches 150℃, the chip would turn off and lock until turn off the power and repower-on.Figure 3Figure 3 shows the temperature performance under the conditions of 220V AC input and 60mA output.JY2412 can work in very low temperature environment and has passed low temperature tests.●Applying low power CMOS process, high integration and patentedtechnologiesJY2412 integrates two independent linear constant-current modules, external remote controlling connecting module, external PMW dimming module, temperature controlling module, etc.●High power factor and high reliabilityAny products of JYxxxx constant-current series can work without capacities and reach a high power factor of 0.97. JY2412 has high reliability with a trouble-free time over 50000 hours. It supports general SCR elements and external PWM dimming. DIM port can connect with any MCU to achieve the goal of intelligent controlling or dimming.●High accuracy of constant currentJY2412 has a very high accuracy of constant current. It can also keep a constant current in the area where voltage is very unsteady.Figure 4Figure 4 shows the VI performance under the conditions of 60mA output and a range of input voltage of 190V~260V.●Linear driving without EMIJY2412 works under the linear situation and provide no electro-magnetic interference (EMI) while working. It can pass any tests of EMC and EMI.●Few peripheral elements and simple applying circuitsWith simple peripheral circuits and few elements, JY2412 can be applied in many occasions. It can be used directly on the lighting source boards to integrate the drivers and the lighting sources to cut cost.●Intelligent joint control mechanism between temperature and dropout voltageThe most obvious disadvantage of the normal linear constant-current drivers is that the IC has to undertake the dropout voltage. So, when the power voltage exceed the normal range, the driving circuits would consume more power and the temperature would increase. High temperature would influence the circuits’ stabili ty and theproducts’ reliability.JY2412 applies the intelligent joint control mechanism between temperature and dropout voltage to solve the problem mentioned above. While working, the system would adjust the output power automatically according to the temperature, power and dropout voltage. When the temperature is higher than 120℃ or the input voltage exceeds the normal range, the IC would decrease the output power. The output power would increase to the normal value when the temperature or the input voltage return to the normal range. Also, when the IC detects that the temperature of the lighting sources is too high, it would decrease the power as well to protect the LEDs and extend their life.JY2412 inside structureApplicationJY2412 is suitable to be applied in high-power LED lighting products such as LED bulbs, LED tubes, ceiling lamps and down lamps. Equipped with sensors, it can also be DC/DCExternal sensor port PWM input port Temperature/dropout voltSoft-startInformation processingused in hotels, office buildings, hospitals and underground parks. JY2412 can achieve the real automatic energy-saving lighting.Figure 1 shows a typical application circuit. Sampling voltage is 0.3V coming from Rcs at the source electrodes of MOS tubes. The resistance value can be decided according to the constant current with the formula:Rcs=V/I.Here, Rcs is the current sampling resistance which is connected to the source electrodes in series. V is the sampling voltage of JY2412, which is 0.3V normally. I is the output current of LEDs. For example, if the LEDs current needed is 60mA, then the R should be 0.3 (V) / 0.06 (A) = 5Ω. The rest can be done in the same manner.In the typical application circuit, the value of R1 is 510k-810k and the C1 is 1 -2.2 uf 35v.The sixth pin of JY2412 is the external PWM dimming port. It can connect to MCU directly. By outputting PWM signals, MCU can dim the lights. JY2412 can also use DC voltage of 0-5V input into DIM port to dim. Figure 5 shows how to connect.The second pin of JY2412 is HAL, the half-power enable port. When input low level, the output power of both channels would decrease 50%. In some occasions like hotels or underground parks, with connecting to sensors, the chip output 50% of the full power in normal time and increase to 100% when people or cars pass by. Typically, the port connects to ground through a switching diode 1N4148. When the sensors output low level, the chip output 50% of the full power. When the sensors output high level, the chips output full power. This port can connect with timer as well to control street lamps and save energy in the time after midnight. Figure 6 shows how to connect.SensorFigure 6PackagingJY2412 can be applied in areas with electric supply voltage of AC220V-240V or AC100V-120V.Working voltage range:Areas with supply voltage of AC220V: AC190V -260V.Areas with supply voltage of AC110V: AC85V -135V.。