Monolithic Power Systems Inc. EV24833-A-N-00A

Overview

EV24833-A-N-00A from Monolithic Power Systems is an evaluation board designed to demonstrate the MP24833-A white LED driver IC, supporting both buck and inverting buck-boost topologies with 15–25 V (buck) or 28–50 V (buck-boost) input ranges, 3–21 V LED string voltage, and 1 A constant current output.

For engineers reviewing the EV24833-A-N-00A datasheet, EV24833-A-N-00A pinout, EV24833-A-N-00A application, or EV24833-A-N-00A equivalent, this board enables rapid validation of analog/PWM dimming, cycle-by-cycle over-current protection, thermal shutdown, and open-string protection in real-world LED lighting designs.

Technical Context

The EV24833-A-N-00A implements a fixed 200 kHz switching frequency and integrates the MP24833-A IC in SOIC8EP package with internal 0.19 Ω power MOSFET. It supports dual-mode operation via JP1/JP2 jumper configuration-buck mode (JP1 shorted) for step-down conversion and buck-boost mode (JP2 shorted) for inverting step-up/down operation.

Board-level design includes 68 μH/3.2 A power inductor (Wurth 7447709680), 2.2 μF/100 V ceramic output capacitor (TDK C3216X7S2A225K), and precision 400 mΩ current-sense resistors (R6/R7) enabling accurate 1 A LED current regulation across both topologies.

Key Specifications

Availability

EV24833-A-N-00A is available at Aetrix Electronics and suitable for LCD backlight panels, notebook computer illumination, and automotive interior lighting requiring stable component supply and rapid prototyping capability.

Supply support for EV24833-A-N-00A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with core expertise in DC/DC converters, LED drivers, and motor drivers.

The MP24833-A product line targets high-efficiency, wide-input-range white LED driving for space-constrained applications where dual topology flexibility and robust protection are critical.

FAQ

What topologies does the EV24833-A-N-00A support?

The board supports buck (step-down) and inverting buck-boost (step-up/down) configurations, selected via JP1/JP2 jumpers. Buck mode requires JP1 shorted and JP2 open; buck-boost mode requires JP2 shorted and JP1 open. Both modes deliver regulated 1 A LED current with 3–21 V string voltage compliance.

How is LED current set on this evaluation board?

LED current is set to 1 A using two parallel 400 mΩ current-sense resistors (R6 and R7), yielding 200 mΩ total sense resistance. The MP24833-A's internal 0.198 V reference voltage determines current via I_LED = 0.198 V / R_SENSE, matching the measured 1 A output under test conditions.

Can the EV24833-A-N-00A be used for step-up-only applications?

Yes-the board supports non-inverting step-up operation by connecting the LED load to "LED+_Boost" and "LED-" terminals while shorting JP2 and opening JP1. This configuration leverages the MP24833-A's inverting buck-boost architecture to generate higher output voltage than input, validated up to 21 V LED string voltage.

What dimming methods are implemented and how are they controlled?

The board implements both analog dimming (0.6–1.6 V applied to EN/DIM connector) and PWM dimming (100 Hz–2 kHz square wave >1.6 V). Combined dimming uses PWM signals with amplitude between 0.6 V and 1.6 V, enabling fine-grained brightness control without flicker or color shift.

Which protection features are active and how are they verified?

Active protections include cycle-by-cycle over-current (via internal current limit), thermal shutdown (triggered at ~150 °C junction temperature), open-string detection (monitors FB pin voltage), and output short-circuit protection. All are demonstrated in the EVB test report using controlled fault injection and oscilloscope waveforms.

Is the board RoHS-compliant and lead-free?

Yes-EV24833-A-N-00A uses only RoHS-compliant, lead-free, and halogen-free components per MPS green status policy. All passive components (capacitors, resistors, inductors) and the MP24833-A IC meet IPC-J-STD-609 Class 1 requirements, verified through manufacturer declarations and bill-of-materials traceability.