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Sino Science&Technology Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of Lifepo4 batteries,energy storage battery,portable UPS power supply,personalized customization lithium battery pack etc .
Environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery,3.7V lithium polymer battery, NiMH battery , NiCD battery ,Lead acid battery,dry cell battery ,alkaline battery ,heavy duty battery, button cell battery etc. we devote to R&D,innovation ,production & sales
Shenzhen Green Power Energy Battery Co.,ltd specializes in a wide range of digital battery such as environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery, 3.7V lithium polymer battery, NiMH battery, NiCD battery, dry cell battery, alkaline battery, heavy duty battery, button cell battery etc. we devote to R&D, innovation, production & sales. With automatic production machines we have been exported goods to all over the world over 15years. We have complete exported certificate such as KC, CE, UL, BSCI, ROHS, BIS, SGS, PSE etc
Dongguan Datapower New Energy Co.,ltd is a high-tech production enterprise which specialize in the R&D and production&sale of lithium polymer batteries,drone battery,airplane batteries &battery pack etc.
Anhui Seong-hee New Energy Technology Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of primary batteries. And mainly produces and sells alkaline batteries & carbon zinc batteries. there are size AA, AAA, C, D, 9V etc
Guizhou STD Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production & sale of lithium polymer batteries, drone battery, airplane batteries & battery pack etc.
release time:2024-04-07 Hits: Popular:AG11 battery
Analysis of driver technology solutions for LED backlights
Various vehicle-mounted displays such as car dashboards, car navigation, audio displays, and rear-seat entertainment are developing in a diversified and large-scale direction. Under this trend, the requirements for increasing the number of LED lights as well as high brightness and high dimming rate are increasing day by day. In order to meet the development trend of increasing the number of LED lamps, ROHM has built-in a buck-boost DC/DC converter with high withstand voltage and a current driver circuit that can drive low-power LEDs with multiple lamps and achieve high dimming rate. This chip expands the LED driver. Next, we introduce the LED driver BD81A34EFV-M for backlights developed by ROHM.
BD81A34EFV-M is roughly composed of three functional blocks: DC/DC converter section, current driver section, and protection circuit section.
As a backlight driver, a certain voltage is first generated by a DC/DC converter. Connect the output of the DC/DC converter to the LED anode side of the panel, and pour a constant current from the cathode side of the LED into the LED driver to make the LED light up. In order to support low-power multi-lamp LED driving, the number of LED channels (number of connectable columns) is designed to be 4.
By controlling the switching duty cycle of the DC/DC converter, the output reaches a level higher than the LED anode pin, which includes the number of LED segments linked to the current driver, that is, the VF generated by the LED, through the LED driver The error amplifier performs feedback control so that the LED cathode pins (LED1~4 pins) connected to the IC are 1.0V. Through the above control, the current driver section can keep the LED current constant. For panel brightness adjustment, the output current has a PWM-dimming function. The duty cycle of the LED current can change synchronously with the external PWM signal input. Not only that, BD81A34EFV-M is also equipped with LED open circuit and short circuit fault protection, LED ground fault protection, DC/DC converter output overcurrent and overvoltage protection functions. The complete protection circuit is very helpful to improve the reliability of the panel.
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