Monolithic Power Systems Inc. MP4056GS-P

Overview

MP4056GS-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 down to 0.1%.

For engineers reviewing the MP4056GS-P datasheet, MP4056GS-P pinout, MP4056GS-P application, or MP4056GS-P equivalent, this device is selected for high-PF (>0.9), low-EMI, thermally robust LED drivers requiring fast start-up (<130 µs), NTC-based thermal fold-back, and reliable ZCD-based zero-current switching in residential/commercial lighting.

Technical Context

The MP4056GS-P implements real-current control using a proprietary multiplier architecture that shapes primary peak current into a sinusoid aligned with rectified AC line voltage-enabling >0.9 power factor without auxiliary controllers. Its boundary-conduction mode (BCM) operation minimizes MOSFET switching losses and eliminates diode reverse-recovery noise by triggering gate turn-on precisely at inductor current zero-crossing detected via ZCD pin.

Dimming compatibility is achieved through adaptive phase-cut detection: leading-edge dimmer identification uses tLEADING (86–134 µs) and VMULT_LD thresholds (0.08–0.30 V), while trailing-edge detection relies on tTRAILING (388–602 µs) and multi-level VMULT_TL thresholds (0.25–0.47 V) with 80 mV hysteresis. The DIM pin provides complementary PWM output for color temperature/brightness co-control in warm-dim applications.

Key Specifications

Pinout & Package

MP4056GS-P is packaged in SOIC-8 with exposed pad (RoHS-compliant, lead-free/halogen-free). Pin functions are validated per MPS Rev.1.01 datasheet and EVB schematics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCL30000 and AL1676, MP4056GS-P uniquely integrates DIM-driven warm-sunset functionality, adaptive dimmer detection with deep dimming, and NTC-based thermal management-making it optimal for premium residential/commercial tunable-white designs requiring single-chip simplicity and thermal resilience.

Availability

MP4056GS-P is available at Aetrix Electronics and suitable for residential LED lamps, commercial downlights, and industrial high-bay fixtures requiring stable component supply, RoHS compliance, and long-lifecycle support.

Supply support for MP4056GS-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 design centers in the US, China, and Taiwan.

The MP4056 product line targets cost-sensitive, high-efficiency non-isolated LED drivers for global lighting markets-emphasizing TRIAC compatibility, thermal reliability, and integration to reduce system size and bill-of-materials.

FAQ

What dimmer types does MP4056GS-P support?

MP4056GS-P supports both leading-edge (TRIAC) and trailing-edge (electronic low-voltage) dimmers through adaptive detection. It uses tLEADING (86–134 µs) and VMULT_LD thresholds (0.08–0.30 V) for leading-edge recognition, and tTRAILING (388–602 µs) with multi-level VMULT_TL thresholds (0.25–0.47 V) for trailing-edge identification-ensuring compatibility with >95% of commercially available dimmers.

How does the DIM pin enable warm-sunset dimming?

The DIM pin outputs a PWM signal whose duty cycle is inversely proportional to the TRIAC phase angle: as dimming reduces LED current, DIM duty increases to drive warm-white LEDs harder. This is implemented via internal logic that correlates MULT pin phase information with DIM timing-enabling smooth 2700K→4000K CCT shift without external MCU or DAC.

What is the role of the NTC pin in thermal management?

The NTC pin accepts a thermistor to implement programmable current fold-back: when ambient temperature rises, NTC resistance drops, lowering voltage at the pin. At VH_NTC (1.2 V), full current is delivered; at VL_NTC (0.8 V), current begins reducing linearly; below VSD_NTC (0.38 V), output shuts down-prolonging LED life in enclosed fixtures.

Does MP4056GS-P require an external MOSFET?

No-MP4056GS-P integrates a 30 V, 250 mΩ low-side MOSFET (pin D and S). It drives external high-side switches in buck-boost configurations but eliminates need for separate low-side switch, gate driver, and current-sense amplifier-reducing total solution size by ~40% versus discrete controllers.

How does ZCD pin short-circuit protection work?

ZCD pin short-circuit protection activates when voltage falls below 100 mV for >33 ms. Internal circuitry disables ZCD comparator, forces MOSFET off, and initiates auto-restart via VCC UVLO cycling. This prevents latch-up during open-load or shorted-auxiliary-winding faults-verified in EV4056-K-00B test reports.

What is the minimum off-time (tOFF_MIN) specification and why does it matter?

tOFF_MIN is 5.3 µs (typical) and increases to 10 µs when NTC ≤1.0 V. This parameter limits maximum switching frequency to ~180 kHz, preventing EMI excursions beyond CISPR-15 Class B limits and ensuring stable operation across universal AC input (90–265 VAC) and load variations.

Can MP4056GS-P operate without an auxiliary winding?

No-auxiliary winding is mandatory for sustained operation. While the internal D-pin charger enables start-up, the auxiliary winding powers VCC once switching begins. Without it, VCC collapses below VCCL (9 V) after initial charge, causing repeated auto-restart cycles and unstable output current.