The well-known Japanese semiconductor manufacturer ROHM (headquartered in Kyoto, Japan) has developed a 4-channel backlight LED driver "BD9428" that is very helpful for LCD panels (TVs, monitors) to achieve lower power consumption.
The new product utilizes ROHM's proud original control circuit technology while achieving high efficiency and low noise. By increasing the withstand voltage level of the built-in MOSFET to 80V and the maximum LED current to 250mA / ch, the product can be applied to various panel sizes, which is very helpful in reducing the design burden.
The production base of the first stage of this product is ROHM Hamamatsu Co., Ltd. (Hamamatsu City, Japan), and the production base of the later stage is ROHM Electronics Philippines, Inc. (Philippines). It is planned to start selling samples from September 2013 (sample price) : 200 yen), starting from November 2013 to temporarily put into mass production at a scale of 200,000 per month.
The backlight part accounts for about 70% of the power consumed by the liquid crystal panel. Therefore, its efficiency has always been a major issue. In recent years, LED has been rapidly popularized. Against this background, ROHM has optimized the power supply voltage supplied by the LED driver to the LED, and has obtained a patent for the purpose of reducing the power consumption of the entire LED backlight system. Model development.
On the other hand, in order to shorten the design time and cost of supporting products, the LED driver of the backlight part and the AC / DC converter of the primary power supply part are generally designed on the same substrate. Although the demand for platformization is also growing, but Higher withstand voltage, support for higher current, and countermeasures for heat generation are all urgent issues to be solved.
As a countermeasure against high withstand voltage, increased current, and improved heat dissipation performance, the industry generally adopts the method of external LED driving MOSFET, but this will lead to increase in mounting area and component cost.
This time, ROHM successfully increased the single-chip LED terminal voltage from the previous 60V to 80V through the most advanced high-voltage BiC-DMOS process, and also increased the maximum LED current from the previous 150mA / ch to 250mA / ch, achieved a greater current. To solve the problem of coil whistle that is easily generated during the process of high voltage resistance and large current, ROHM easily solves the problem by using the built-in PWM original circuit technology to smooth the current waveform. At the same time, the circuit is optimized even if the pulse signal is short Can work stably.
In addition, the use of a patented high-efficiency system enables the product to be more than 10% more efficient than previous control methods, which is very helpful for the device to achieve lower power consumption. Not only that, the use of DIP packaging makes it easier to solve the heat dissipation problem during the integrated design of the same substrate. Through these advantages, the product can be applied to various panel sizes from small to large, and can also reduce design costs and greatly shorten development time.
ROHM will continue to use the analog power technology it is good at to develop LED drivers with lower power consumption and higher added value.
"Features"
1) Using patented high-efficiency system circuit, the energy-saving effect is remarkable
LED backlight generally monitors and controls the LED supply voltage, and this product of Roma controls the LED supply voltage by monitoring the cathode voltage of each LED to keep the minimum voltage constant. This control method can optimize the supply voltage, compared with the traditional control method, it has successfully improved the efficiency by more than 10%. Through the efficient system without waste, it is also very helpful for the equipment to achieve lower power consumption.
US Patent No .: 7,235,954 7,541,785 7,944,189 8,242,756
2) Utilize the original PWM circuit of ROHM to achieve excellent mute performance under high current
Aiming at the problem of coil howling in the process of realizing large current, it is easily solved by the built-in original circuit that smoothes the current waveform during PWM dimming. The silent performance is also excellent.
3) Adopt cutting-edge technology to achieve higher withstand voltage and support larger current, suitable for various panel sizes
Through the cutting-edge high withstand voltage BiC-DMOS process that ROHM is proud of, we have successfully increased the LED terminal voltage from the previous 60V to 80V and the maximum LED current from the previous 150mA / ch to 250mA / ch More current. The product can be applied to various panel sizes from small to large, and it is easier to import the universal model design.
4) Adopt DIP package, heat dissipation countermeasure is easier
This product adopts DIP package, which makes it easier to install heat dissipation measures such as heat sink. Therefore, the universal design of the single-layer substrate can be carried out, which also helps the substrate to further save space.
"Term Explanation"
? BiC-DMOS process
Integrated process technology of bipolar, CMOS, DMOS. It can also coexist with analog and digital, miniaturization and high withstand voltage.
? PWM (pulse width modulaTIon)
A modulation method that controls the current and voltage by extending or shortening the output time of the pulse signal.
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