The LED drive with new Japan Radio developed I2C backlight control type

Nippon wireless (Headquarters: Tokyo central CEO Kokura good) has developed a backlight LED driver NJW4605, the driver is the most suitable for the small LCD display vehicle navigator display, car rear seat entertainment system monitors and other automotive electronic equipment.

NJW4605 is designed to drive the backlight with a high efficiency of the LED and the development of the design of the driver IC, by the 3 circuit constant current drive and boost switching regulator, the maximum can drive 24 LED. In addition, I2C bus can be used to control the LED driver and detect anomalies, etc..

NJW4605

[product features]

Features 1 has the industry's highest level of high precision brightness adjustment and high-precision LED drive current, the most suitable for attention to brightness and color performance of the LCD LCD panel

NJW4605 has the industry's highest level of brightness adjustment accuracy, the minimum accuracy of up to 0.1% (1000:1), able to demonstrate subtle changes in brightness.

In addition, the current error between LED current accuracy and channel to + 2% (max.) with high accuracy, not due to differences in the characteristics of LED stain, LCD liquid crystal panel is the most suitable for special attention to color expressive force.

Features 2 automatically adjust the brightness function so that it will not increase the burden on the CPU, to achieve a natural brightness adjustment

Automatic adjustment of brightness is a function of the NJW4605 to generate a CPU in the setting of the brightness value and set the value of the adjustment between the brightness of the intermediate value, and constantly modify its value to change the brightness of the LED function. The maximum can come in 1024 steps to generate pulse modulation signal, will not add any burden to the CPU, thereby achieving a natural soft brightness changes.

Features 3 external synchronization function to prevent radio and mobile phones and other radio interference

NJW4605 built-in switch regulator can work with the external clock synchronization, can be input by the CPU microprocessor clock signal, so to prevent interference from radio and mobile phones and other radio waves. This product is the most suitable for car navigation and other automotive electronic equipment.

[product performance]

After a wide range of working voltage (Wide Input Range *1):6.0V ~ 30V

After working temperature range: -40 to +105 DEG C

After I2C Bus control

After the 3 circuit with constant current drive: 10mA ~ 80mA/ch.

After setting the high precision LED current: 2% max. (@ILED=40mA)

After switching frequency: 300kHz ~ 1MHz

After the PWM brightness adjustment function

After the FAULT signal output

After the protection function

LED open / short circuit protection, over current protection, over voltage protection,

Low voltage fault protection circuit

After the package: SSOP32 (11 x 7.6 x 1.25mm)

In vehicle equipment, industrial equipment and other applications, the need for a wide range of power supply voltage IC.

Nippon wireless in order to meet the market demand, developed from a few V to the corresponding 35V power supply voltage in a wide range of wide working voltage range (Wide Input Range) series of products (high power IC).

(from the world of Electronic Engineering: http://www.eeworld.com.cn/LED/2012/0511/article_6991.html)