Monolithic Power Systems Inc. EV4603-S-00A

Overview

EV4603-S-00A from Monolithic Power Systems is an evaluation board designed to demonstrate the MP4603ES buck-boost white LED driver IC for TV backlighting. It supports 12V input (±10%), delivers regulated output voltage from VINH to VINH+63V (up to 350V total), and regulates LED current at 120mA with 200kHz switching frequency and synchronization capability.

For engineers reviewing the EV4603-S-00A datasheet, EV4603-S-00A pinout, EV4603-S-00A application, or EV4603-S-00A equivalent, this board enables rapid validation of high-voltage LED string drive, PWM/analog dimming integration, multi-board synchronization, and fault signaling in large-panel backlight systems.

Technical Context

The EV4603-S-00A implements a synchronous buck-boost topology using the MP4603ES controller IC, which integrates a 0.5Ω internal N-channel MOSFET switch and supports external high-side power FET (Q1: SMK0260D, 600V/2A). It operates with dual inputs: low-voltage 12V DC (VIN) and high-voltage source (VINH, up to 150V) to generate up to 350V LED string bias.

It provides cycle-by-cycle over-current protection, thermal shutdown, LED open/short detection, and a dedicated FAULT output signal. Dimming is implemented via separate analog (0–1.2V ADIM) and PWM (100Hz–20kHz) control paths, achieving >1:1000 dimming ratio with ±5% reference accuracy.

Key Specifications

Availability

EV4603-S-00A is available at Aetrix Electronics and suitable for TV backlighting, large LCD panel illumination, and multi-channel synchronized LED driver development requiring stable component supply and validated reference design implementation.

Supply support for EV4603-S-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 conversion, LED drivers, and motor control solutions.

The EV4603-S-00A belongs to MPS' evaluation board portfolio for high-efficiency LED backlight drivers, engineered specifically to accelerate design-in of buck-boost architectures in large-format display applications.

FAQ

What is the maximum LED string voltage supported by EV4603-S-00A?

The board supports LED string voltages from VINH to VINH+63V. With VINH set to 150V (as tested), output reaches 213V; combined with typical LED forward voltage per string, total bias up to ~350V is achievable. This enables driving long series strings common in 55"+ TV panels.

How does synchronization work across multiple EV4603-S-00A boards?

Synchronization is achieved by connecting all SYNC pins together and applying a common 200kHz clock signal. This aligns switching edges across boards, minimizing beat frequencies and simplifying EMI filter design when driving segmented backlight zones in large displays.

Can EV4603-S-00A operate in pure buck or pure boost mode?

Yes. With JP1 open and JP2 shorted, it operates in buck mode (LED+ and LED− connections used). With JP1 shorted and JP2 open, it operates in boost mode (BOOST and LED− used). Mode selection is hardware-configurable via jumpers per the Quick Start Guide.

What protection features are implemented on the board?

The board implements LED open-circuit detection, LED short-circuit protection, cycle-by-cycle over-current limiting, thermal shutdown, and a dedicated FAULT output that asserts low during fault conditions. These are enabled by the MP4603ES IC and verified in test waveforms.

What is the role of the 100μH inductor (L1) and 600V MOSFET (Q1)?

L1 (Wurth 7447715101) sets the energy transfer timing and ripple current in buck-boost operation. Q1 (AUK SMK0260D) serves as the external high-side switch handling high-voltage swing and peak currents, complementing the MP4603ES's internal 0.5Ω switch for extended voltage range.

Is analog dimming linear across the full 0–1.2V ADIM range?

Yes. The board implements true analog dimming with linear current scaling from 0% to 100% LED current over 0–1.2V ADIM input, verified in the Analog Dimming Curve (Figure 5). This enables flicker-free, low-frequency brightness control without PWM artifacts.