Monolithic Power Systems Inc. MP4056GK-P

Overview

MP4056GK-P from Monolithic Power Systems is a non-isolated, TRIAC-dimmable offline LED controller with integrated active PFC and boundary-conduction mode operation. It delivers accurate constant-current LED drive up to 50W in single-stage buck-boost topologies, supports warm sunset dimming via dual PWM/analog DIM control, and features adaptive leading/trailing-edge dimmer detection with deep dimming range (≥0.5% output current). Its internal low-side MOSFET (30V BVDSS, 250mΩ RDS(ON)) enables compact, cost-effective lighting designs.

For engineers reviewing the MP4056GK-P datasheet, MP4056GK-P pinout, MP4056GK-P application, or MP4056GK-P equivalent, key selection considerations include TRIAC compatibility across legacy dimmers, programmable NTC-based thermal fold-back for LED lifetime extension, ZCD-based zero-current switching for EMI reduction, and fast VCC startup without perceptible delay using internal charging circuitry.

Technical Context

The MP4056GK-P implements real-current control using a multiplier-driven current reference derived from rectified AC line voltage on the MULT pin, enabling high power factor (>0.9) and sinusoidal input current. Its boundary-conduction mode (BCM) operation minimizes switching losses by triggering the internal MOSFET turn-on at valley points detected via ZCD pin voltage falling below 0.30V with 2.3µs blanking.

Dimming is managed through adaptive phase-cut analysis: leading-edge dimmer detection uses 100µs timing threshold and 0.10V/0.28V VMULT thresholds, while trailing-edge detection employs multi-level 0.45V/0.10V thresholds with 80mV hysteresis. The DIM pin provides complementary PWM control for color temperature modulation, synchronized inversely to TRIAC conduction angle.

Key Specifications

Pinout & Package

MP4056GK-P is packaged in MSOP-10 with exposed thermal pad (RoHS-compliant, halogen-free). Pin functions are validated per MPS MP4056 Rev.1.01 datasheet Figure 14 (MSOP-10 top view).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP4056GK-P, MP4057GK-P trades integrated MOSFET simplicity for higher power scalability, while NCL30000DR2G sacrifices TRIAC flexibility for tighter EMI control in pre-engineered PFC+LED systems.

Availability

MP4056GK-P is available at Aetrix Electronics and suitable for residential LED lamps, commercial downlights, and industrial high-bay fixtures requiring stable component supply with full lifecycle support.

Supply support for MP4056GK-P 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 over 20 years of leadership in LED driver innovation.

The MP4056 product line targets cost-sensitive, non-isolated LED lighting applications demanding TRIAC compatibility, high PF, and thermal robustness-designed specifically for retrofit and architectural lighting markets.

FAQ

What dimmer types does MP4056GK-P support?

MP4056GK-P supports both leading-edge (TRIAC) and trailing-edge (electronic low-voltage) dimmers through adaptive detection. It identifies dimmer type using VMULT voltage thresholds (0.10V/0.28V for leading edge; 0.45V/0.10V for trailing edge) and timing windows (100µs vs. 450µs), ensuring compatibility with Lutron, Leviton, and Legrand models without manual configuration.

How does the internal VCC charging circuit eliminate startup delay?

The MP4056GK-P uses the D pin's internal JFET and diode to charge the VCC capacitor directly from the rectified AC line during initial power-up. This bypasses slow RC charging networks, achieving reliable startup in under 130µs-as confirmed by tSTART parameter (100–165µs)-with no perceptible delay in lamp turn-on.

Can MP4056GK-P drive LEDs without an optocoupler?

Yes. As a non-isolated controller, MP4056GK-P regulates LED current using primary-side sensing via the S pin and ZCD feedback-eliminating the need for secondary-side optocouplers or TL431 references. Output voltage is inferred from auxiliary winding turns ratio, enabling compact, low-cost designs.

What protections are included and how do they auto-recover?

All protections-including output OVP (5.30V), over-current (2.70V), ZCD short-circuit (122mV), and over-temperature (150°C)-trigger auto-restart. When fault occurs, the IC halts switching, VCC discharges to 7.0V (VCCEN), then re-enables internal charging to restart the power cycle without external intervention.

How is warm sunset dimming implemented with the DIM pin?

The DIM pin outputs a PWM signal complementary to TRIAC conduction angle: as TRIAC reduces LED current, DIM increases duty cycle to drive warm-white LEDs brighter while cool-white LEDs dim. This inverse relationship-enabled by internal logic-creates smooth CCT shift from 2700K to 1800K across the full dimming range.

What is the role of the DAMP pin in EMI reduction?

The DAMP pin drives an external MOSFET that activates a snubber network across the TRIAC during commutation. By clamping voltage spikes at zero-crossing transitions, it suppresses differential-mode EMI-critical for meeting FCC Class B limits in compact LED drivers without large filter components.

Does MP4056GK-P require external compensation components?

Yes. The COMP pin requires an external RC network (typically 1nF capacitor + 100kΩ resistor to GND) to stabilize the current control loop. This network sets dominant pole frequency and phase margin, ensuring ±3% LED current regulation across line/load/temperature variations as verified in EV4056-K-00B test data.