Intel Corporation, a leader in high-performance analog mixed-signal semiconductor design and manufacturing, today announced the introduction of the ISL97671/2/3/4, an innovative multi-channel LED driver family with ultra-low-power dimming capabilities, significantly extending notebooks, netbooks and The battery life of your tablet.
The new highly integrated ISL97671/2/3/4 series reduces the undue visual effects of traditional backlights, such as flicker, flare and streaking with traditional LED drivers . This series of devices uses a self-developed dynamic margin control circuit to detect the LED string that produces the highest voltage, and then adjust the boost output to the minimum required voltage to reduce energy consumption. The device can drive up to six strings of 40mA LEDs from an input voltage of 4.5V to 26V. The highly accurate LED current matching circuit controls the matching current between the LED strings to ±0.7%, which is the best in the industry. The ISL97671/2/3/4 family also includes an integrated boost converter that boosts the input voltage up to 45V to provide voltage to the LED stack.
Adaptive boost control circuit regulates output voltage
This series of drives maintains dimming linearity even at low LED PWM duty cycles. This is because an adaptive boost control circuit is used which is capable of adjusting the output voltage even when the LED is turned off for most of the PWM period. With this proprietary boost structure, the ISL97671/2/3/4 family responds to very low PWM duty cycles, modulating the brightness to only 0.007% of maximum brightness and PWM frequency of 200Hz. The dimming can be directly controlled by the PWM dimming circuit, or it can be controlled by the 8-bit digital dimming function through the I2C/SMBus interface.
This family of phase shifting features turns the LED string on at a specific phase and reduces the peak input current by distributing the channel current during the dimming period. This feature contrasts with traditional multi-channel LED drivers that turn on and off all LED strings simultaneously.
I ntersil 's family of devices includes a wide range of protection features to ensure maximum reliability, such as over temperature protection, overvoltage protection and LED open/short protection. This family of devices integrates power MOSFETs for boost converters and channel regulator circuits, providing an extremely compact solution for flexible designs.
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