The EVQ3369-R-01A is an evaluation board for the MPQ3369, which is a step-up converter with six channel current sources. It is designed for driving the white LED arrays as backlighting for mid- or small-sized LCD panels.
The MPQ3369 uses peak-current mode as its PWM control architecture to regulate the boost converter. Six channel current sources are applied to the LED cathode to adjust the LED brightness. It regulates the current in each LED string to the value set by an external current-setting resistor, with 2.5% current regulation accuracy between strings.
The IC employs a low on-resistance MOSFET and a low headroom voltage design to achieve high efficiency. It has a standard I2C digital interface for easy use. The switching frequency can be programmed by a resistor, the I2C interface, or an external clock.
The MPQ3369 provides analog, PWM, and mix dimming mode with PWM input. The dimming mode can be selected via the I2C interface or the MIX/AD pin. It also offers a phase shift function to eliminate noise when PWM dimming.
Protections features designed to guarantee safe operation include over-current protection (OCP), over-voltage protection (OVP), over-temperature protection (OTP), LED short and open protection. The LED current also automatically decreases at high temperatures.
The MPQ3369 is available in QFN-24 (4mmx4mm) and TSSOP-28EP packages.
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