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
110VAC/220VAC. 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 - 250mV 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