Monolithic Power Systems Inc. MP4030GS

Overview

MP4030GS from Monolithic Power Systems is a TRIAC-dimmable, primary-side-control offline LED controller with integrated active PFC and an internal low-side MOSFET (30 V, 250 mΩ). It delivers accurate LED current regulation in isolated single-stage flyback converters without optocouplers or secondary-side feedback, supports boundary-conduction mode operation, and enables flicker-free dimming across extended phase-cut ranges. Used in residential and commercial LED retrofit lamps.

For engineers reviewing the MP4030GS datasheet, MP4030GS pinout, MP4030GS application, or MP4030GS equivalent, this page provides verified technical context, real-current-control architecture details, TRIAC dimming threshold values, protection trigger points, and SOIC8 package integration guidance for LED driver design validation and BOM optimization.

Technical Context

The MP4030GS implements proprietary real-current-control using primary-side sensing via the S pin and ZCD-based zero-current detection to regulate LED current without secondary feedback. Its multiplier circuit (MULT pin) accepts rectified line voltage to generate a sinusoidal reference for high PF (>0.98) and low THD (<12%).

It operates in boundary-conduction mode with programmable cycle-by-cycle current limiting (2.3 V clamp), 5.6 µs minimum off-time, and auto-restart fault protection including over-voltage (5.5 V on ZCD), short-circuit (COMP ≥ 5 V), and over-temperature (150 °C junction).

Key Specifications

Pinout & Package

MP4030GS is housed in an 8-pin SOIC package (JEDEC MS-012, 150 mil width), optimized for compact LED driver PCB layouts with thermal pad grounding and creepage compliance for Class II isolation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP4030GS, MP4028GS trades integrated MOSFET simplicity for higher voltage headroom and thermal flexibility, while BP5629D sacrifices PFC, BCM efficiency, and primary-side accuracy to reduce system cost-making MP4030GS optimal for certified, dimmable, single-stage 15–36 W LED drivers.

Availability

MP4030GS is available at Aetrix Electronics and suitable for residential LED retrofit lamps, commercial downlight drivers, and industrial panel-mount LED fixtures requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for MP4030GS 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 design centers in the US, China, and Taiwan, and global distribution through authorized partners.

The MP4030GS belongs to MPS's offline LED controller product line, engineered specifically for TRIAC-dimmable, single-stage, primary-side-regulated lighting systems targeting ENERGY STAR, DLC, and IEC 61000-3-2 compliance.

FAQ

What is the maximum output power supported by MP4030GS in a single-stage flyback design?

The MP4030GS is rated for up to 36 W output in typical TRIAC-dimmable applications, based on its 30 V internal MOSFET, 250 mΩ RDS(ON), and thermal limits in SOIC8. Designs exceeding 25 W require careful PCB copper area allocation and airflow management to maintain ≤125 °C junction temperature under worst-case line and load conditions.

Does MP4030GS require an auxiliary winding for VCC supply after startup?

Yes - after initial startup via the internal JFET charging circuit from the D pin, the MP4030GS relies on the auxiliary winding to sustain VCC. The auxiliary winding must deliver ≥11 V at minimum load to prevent brownout; typical designs use a 19-turn auxiliary winding with 82:19 primary-to-auxiliary turns ratio for 120 VAC input.

How does MP4030GS achieve flicker-free dimming at low brightness levels?

MP4030GS uses COMP pin clamping at 1.9 V during deep dimming to maintain sufficient gate drive for the internal MOSFET, ensuring TRIAC holding current is sustained. Combined with 25% line-cycle blanking and DP MOSFET pull-down, this prevents mis-triggering and random flicker below 10% output current.

Can MP4030GS be used without the internal MOSFET?

No - the MP4030GS integrates a fixed 30 V, 250 mΩ low-side MOSFET and does not support external switch control. For higher-voltage or higher-power applications, MPS recommends MP4028GS, which omits the internal MOSFET and provides gate-driver output for external 650 V switches.

What protection features automatically reset without external intervention?

All MP4030GS protections - over-voltage (ZCD ≥ 5.5 V), short-circuit (COMP ≥ 5 V), over-current (ZCD ≥ 0.9 V), and over-temperature (150 °C) - enter auto-restart mode. After fault latching, the IC disables switching and recharges VCC via internal circuitry; once VCC drops below 7 V, it initiates a new startup sequence without manual reset.

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

Yes - in properly designed single-stage flyback configurations with appropriate input EMI filtering and inductor sizing, MP4030GS achieves PF >0.98 and THD <10%, meeting IEC 61000-3-2 Class C requirements for lighting equipment up to 25 W per lamp, and Class A for multi-lamp systems.

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

The MULT pin resistor divider must scale the rectified line voltage to 0–3 V range. For 264 VAC input, a typical solution uses 499 kΩ (top) and 7.5 kΩ (bottom) resistors, yielding ~2.8 V peak at MULT. Divider current should exceed 100 µA to ensure noise immunity while minimizing power loss in high-impedance networks.