MT7910

  MT7910 High Brightness LED Driver DESCRIPTION The MT7910 is a hysteresis current mode control LED driver IC. The MT7910 operates in constant off-time mode. It allows efficient operation of High Brightness (HB) LEDs from voltage sources ranging from 14VDC up to 450VDC or 85VAC ~ 265VAC. The MT7910 includes a PWM dimming input that can accept an external control signal with a duty ratio of 0 - 100% and a frequency of up to a few kilohertz. It also includes a 0 - 245mV linear dimming input which can be used both for linear dimming and temperature compensation of the LED current. The MT7910 is ideally suited for buck LED drivers. Since the MT7910 operates in hysteresis current mode control, the controller achieves good output current regulation without the need for any loop compensation. Further, with Maxic proprietary control technology (patent pending), MT7910 achieves precision output current accuracy from 85VAC ~ 265VAC. PWM dimming response is limited only by the rate of rise and fall of the inductor current, enabling very fast rise and fall times. Frequency jittering is used to reduce the EMI. FEATURES Proprietary constant-current control. Great LED current accuracy. Wide input range from 14VDC to 450VDC or 85VAC to 265VAC Application from a few mA to more than 1A output Up to 92% efficiency Up to hundreds of LEDs Linear and PWM dimming capability Requires few external components for operation Temperature compensation to regulate LED current Embedded O...