The MP4000 is a high efficiency step-down converter designed for driving high brightness Light Emitting Diodes (LEDs). The MP4000 drives an external MOSFET in the floating buck converter structure. The inductor current is regulated with boundary conduction mode which features no reverse recovery loss in the freewheeling diode and soft turn on for the power MOSFET. Such operation mode can achieve very high efficiency and at the same time minimize the inductor value and size. Also, the LED current can be well regulated by controlling the MOSFET peak current, which is sensed through an external resistor. Its low 300mV feedback voltage reduces power loss and improves efficiency. The MP4000 can accept an external PWM or a DC signal for the burst dimming control. The MP4000 features output short protection, maximum switching frequency limit, under-voltage lockout and thermal shut down.
Constant-current LED Driver
Power MOSFET Zero-Current Turn On
No Freewheeling Diode Reverse Recovery Issues
High Efficiency and Reliability in Boundary Mode Operation
Low 0.9mA Operation Current
PWM or DC Input Burst Dimming Control
Hiccup Short Circuit Protection
UVLO, Thermal Shutdown
Maximum Frequency is Limited to 110kHz
Available in SOIC8 Package
Open LED ProtectionNo
Vac (max) (V)305
Pout (max) (W)40
Vac (min) (V)85
350mA Off-Line WLED Driver Evaluation Board For 180-260VAC Input
The EV4000DS-00C is an evaluation board for the MP4000. The EV4000DS-00C is a high efficiency step-down converter designed for driving high brightness Light Emitting Diodes (LEDs).
The EV4000DS-00C can supply a maximum output current of 350mA to drive 10 to 40V LED strings from a wide input voltage 180 to 260VAC with 50/60Hz.