Macroblock`s (www.mblock.com.tw) MBI6703 is a frequency-adjustable, peak current mode step-up DC/DC controller to drive external constant current LED drivers, ex. MBI1838, with multi-strings. It is designed for large LCD panels that employ an array of LEDs as the light source. MBI6703 accepts wide input voltage range from 10V to 30V.
MBI6703 can receive external pulse width modulation (PWM) dimming control signal to turn on/off the output voltage according to the dimming.
MBI6703 is built with complete protection features to protect the controller from fault situations. The soft-start function eliminates the inrush current while the power is on. The integrated protections, UVLO, OVP, OCP, OTP, and IVP, avoid MBI6703 from being damaged from fault conditions.
MBI6703 supports 4 external feedbacks from the external constant current LED drivers in parallel, and builds in a minimum voltage selector to choose the lowest voltage to make sure all the arrays of LEDs are well controlled.
MBI6703 drives an external MOSFET, which provides good efficiency and maximizes operating voltage. The feature of selectable switching frequency allows optimization of the component size and system efficiency.