DialogSemiconductorplc, a provider of highly integrated power management, audio, AC/DC and short-range wireless technologies, today announced the launch of its new solid-state lighting (SSL) LED driver, compared to the traditional two-stage driver approach. The product combines boost and flyback converters into a single IC to reduce bill of materials (BOM) costs and simplify design while delivering outstanding performance. The new one was developed by Dialog's PowerConversionBusinessGroup (formerly iWatt Inc., acquired by Dialog in July 2013), which enabled the Dialog to expand into the digital power management market.
Provides a universal 100VAC to 277VAC full voltage input range and up to 45W output power. The device integrates a power factor correction (PFC) boost controller and a flyback converter for LED current regulation, and enables a high PF greater than 0.95 and a low total harmonic distortion (THD) less than 10.Dialog The patented Flickerless design achieves near-zero 100-120Hz output ripple, while built-in over-temperature protection (OTP) and derating capabilities allow lighting designers to achieve predictable and reliable lamp life.
The combination of a rich, integrated feature makes the iW3623 an ideal solution for a variety of non-dimming commercial solid state lighting downlights, PAR, T8 and flat chandelier applications.
Using Dialog's patented PrimAccurate master-side control technology eliminates the need for secondary regulators and optocouplers, thereby further saving BOM cost. This device also allows the replacement of field effect transistors (FETs) with lower cost bipolar junction transistors (BJTs). Although the use of BJT switches can reduce the total solution cost, achieving high conversion efficiency is quite challenging. The solution to this problem is to use dynamic base current and resonant mode switches for the boost and flyback stages to achieve maximum conversion efficiency while minimizing EMI. In addition, Dialog's EZ-EMI technology simplifies EMI filtering and further minimizes external part counts.
Most power ICs have a thermal shutdown function that cuts off the IC power supply in high temperature environments. Although this protects the IC, it does not protect the LED driver circuit. The iW3623 includes powerful built-in thermal protection and power derating to virtually monitor the internal temperature of a sealed solid state lighting bulb. The Over Temperature Protection (OTP) function is set via the NTC resistor. When the temperature of the bulb reaches the set temperature, the iW3623 will automatically reduce the current of the LED. This reduces power consumption, which in turn cools the operating environment and ensures that the temperature of the electrolytic capacitors in the system does not rise above the rated value. The power derating function allows the capacitor to operate for the maximum lifetime of the solid state lighting bulb and predicts the life of the bulb. The reduced brightness of the current decrement is minimal, so the user does not notice any change in the light output. In extreme temperature conditions, the iW3623 will cut off the LED current to avoid the risk of safety and fire.
In addition, the iW3623's security features include LED open/short circuit, single fault, overcurrent, current sense resistor component short circuit, input overvoltage, under voltage, and AC line overvoltage/frequency protection. During output overvoltage conditions, the iW3623 enters an extended discharge mode while maintaining fast recovery, allowing hot-swappable LED modules to be supported without dangerously high output voltages.
Plate Heat Exchanger Plate
Plate Heat Exchanger Spare Parts,Plate Heat Exchanger,Plate Spare Part,Plate Type Heat Exchanger
Dongguan Runfengda F&M Co., Ltd , https://www.runfengdaphe.com