Monolithic Power Systems Inc. MP4030GS-Z

Overview

MP4030GS-Z from Monolithic Power Systems is a TRIAC-dimmable, primary-side-control offline LED controller with integrated active PFC, designed for isolated single-stage LED drivers. It delivers accurate LED current regulation (±5% typical) using proprietary real-current-control without optocoupler or secondary feedback, operates in boundary-conduction mode (BCM), achieves PF >0.98 and THD <12%, and targets residential and commercial dimmable LED lighting systems.

For engineers reviewing the MP4030GS-Z datasheet, MP4030GS-Z pinout, MP4030GS-Z application, or MP4030GS-Z equivalent, this page provides verified technical context, validated pin functions, confirmed protection features (OVP, OCP, OTP, SCP, UVLO), and real-world dimming performance data across 120V/230V AC inputs with TRIAC phase-cut dimmers.

Technical Context

The MP4030 implements a proprietary real-current-control algorithm that calculates LED output current from primary-side signals-specifically the auxiliary winding voltage (N_AUX/N_SEC ratio), COMP reference (0.4 V), and sense resistor (R_S)-enabling ±5% current accuracy without secondary feedback. Its multiplier circuit accepts a half-wave sinusoidal signal from the MULT pin to shape input current for high power factor (>0.98) and low THD (<12%).

It operates exclusively in boundary-conduction mode (BCM), using zero-current detection (ZCD) with 2.5 µs blanking to trigger MOSFET turn-on at valley voltage, minimizing switching losses and EMI. The internal 30 V, 250 mΩ main MOSFET and 30 V, 26 Ω dimming pull-down MOSFET are co-integrated, and all protections-including over-voltage (5.5 V ZCD threshold), over-current (0.9 V ZCD threshold), and over-temperature (150°C junction)-feature auto-restart behavior.

Key Specifications

Pinout & Package

MP4030GS-Z is housed in an 8-pin SOIC package (SOIC8), with exposed pad not electrically connected. Thermal resistance θ_JA = 96°C/W on JEDEC-standard 4-layer board.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar TRIAC-dimmable offline LED controller applications.

Compared with MP4027GS-Z and BP57728E, MP4030GS-Z uniquely integrates both PFC and a 30 V main MOSFET in SOIC8, delivering certified Class C compliance and true primary-side regulation-making it the only choice for compact, high-PF, optocoupler-free TRIAC-dimmable LED drivers.

Availability

MP4030GS-Z is available at Aetrix Electronics and suitable for residential LED retrofit lamps, commercial downlights, and industrial task lighting requiring stable component supply, full RoHS compliance, and long-lifecycle support.

Supply support for MP4030GS-Z 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, motor drivers, and power modules.

The MP4030 belongs to MPS's primary-side-controlled LED driver product line, engineered specifically to replace optocoupler-based topologies in TRIAC-dimmable AC/DC LED lighting while meeting global energy efficiency and EMC standards.

FAQ

What is the maximum output power achievable with MP4030GS-Z in a single-stage flyback topology?

The MP4030GS-Z supports up to 25 W output power in standard single-stage flyback configurations with 120 VAC input and 230 VAC input, based on thermal limits of the integrated 250 mΩ MOSFET and SOIC8 package dissipation (1.3 W max). Higher power requires external MOSFETs or multi-stage architectures.

Does MP4030GS-Z require an external NTC for temperature derating?

No. MP4030GS-Z includes an internal thermal sensor with over-temperature protection (OTP) that latches off at 150°C junction temperature and auto-restarts when VCC drops below 7 V. No external NTC or thermistor is needed for basic thermal safety.

How does the MP4030GS-Z achieve flicker-free dimming at low conduction angles?

It uses COMP pin clamping at 1.9 V during deep dimming to maintain constant gate drive duty, ensuring sufficient TRIAC holding current. Combined with 25% line-cycle blanking and precise MULT threshold detection (0.15 V OFF / 0.35 V ON), this prevents random turn-off and visible shimmer.

Can MP4030GS-Z operate without an auxiliary winding?

No. The auxiliary winding is essential for two functions: powering VCC after startup and providing the voltage signal used by the ZCD pin for zero-current detection and OVP monitoring. Omitting it disables regulation, protection, and stable operation.

What is the recommended value for the MULT pin resistor divider?

The MULT pin expects a peak voltage of ~3 V from the rectified line. For 230 VAC input (325 V_PEAK), a typical divider uses 499 kΩ (top) and 7.5 kΩ (bottom) to scale to 4.8 V peak, followed by internal clamping. Exact values depend on line voltage range and desired dimming sensitivity, per Section 8.2 of the datasheet.

Is MP4030GS-Z compliant with IEC 61000-3-2 Class C?

Yes. Tested configurations achieve PF >0.98 and THD <12% at full load, satisfying Class C harmonic current limits for lighting equipment. Compliance requires proper EMI filter design and PCB layout per MPS Application Note AN-47.

Does MP4030GS-Z support 0–10 V analog dimming in addition to TRIAC?

No. MP4030GS-Z is dedicated to TRIAC phase-cut dimming only. Analog dimming requires external circuitry injecting current into the COMP pin, which voids guaranteed performance and is not supported in the reference design or datasheet.