The EVQ3367-R-01A is an evaluation board designed for the MPQ3367, a step-up converter with six channel current sources. It is designed to drive the white LED arrays as backlighting for small- or medium-sized LCD panels.
The device 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. The MPQ3367 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.
A low on resistance MOSFET and headroom voltage are provided to improve efficiency. The MPQ3367 has a standard I2C digital interface for easy use. The switching frequency can be configured via a resistor, I2C interface, or external clock.
The MPQ3367 provides analog, PWM, and mix dimming mode with a PWM input. The dimming mode can be selected with the I2C interface or the MIX/AD pin. The device also has a phase shift function to eliminate noise during PWM dimming.
Protection features that 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 MPQ3367 is available in QFN-24 (4mmx4mm) and TSSOP-28EP packages.