Catalyst launches high power LED driver for the LCD panel Market

Catalyst semiconductor company, announced in size LCD panel Market for the rapid development of the expansion of its high power LED driver. CAT4139 boost converter provides up to 750mA switching current, which can drive up to 22V of LED strings, is the ideal choice for digital photo frames with other emerging applications requiring up to 40 LED for backlight applications.

Most of the high output voltage of the boost converter using a simple variable frequency switching circuit architecture. This architecture will produce redundant harmonic spectrum is wide, the designer is difficult to filter or eliminate; CAT4139 uses a fixed frequency (1MHz) switching circuit architecture, is ideal for low noise applications. In addition, the device is built in high voltage CMOS output stage, can be in the low input voltage state accurately drive 5 series LED (output voltage up to 22V), conversion efficiency of up to 87%. CAT4139 is the beginning of the Catalyst CAT4240 high power boost converter supplement, CAT4240 can drive 10 series of LED, the output voltage up to 38V.

In order to suppress the inrush current (in-rush) generated by the power supply, CAT4139 integrates the soft start control circuit. In the case of LED open circuit failure, the on-chip overvoltage protection circuit forces the chip into a low-power mode by limiting the output voltage of the chip without any additional devices. The above two characteristics have been fully integrated in the chip, without the need to increase external components and related costs, but also save the board space.

Designers can adjust the brightness of LED by DC voltage, logic signal or PWM (pulse width modulation) signal control CAT4139.

Product features

Switching current up to 750mA can drive high voltage LED series, output voltage up to 22V1MHz fixed frequency low noise architecture complete protection function 5 pin TSOT23 thin package (maximum height 1mm)

Supply and price

With 10000 meter, CAT4139 LED drive unit price of $0.64. Sample available now. The delivery time is 6 ~ 8 weeks after receipt of order.

Source: electronic system design