Monolithic Power Systems Inc. MP4060GK-Z

Overview

MP4060GK-Z from Monolithic Power Systems is a TRIAC-dimmable, primary-side control LED controller optimized for 200–265VAC input, delivering PFC-enabled single-stage AC/DC conversion with boundary-conduction mode operation, integrated thermal foldback (T_START = 145°C), and active bleeder disable (R_DS(ON)_BD = 60–115 Ω) for high-efficiency LED drivers up to 50 W.

For engineers reviewing the MP4060GK-Z datasheet, MP4060GK-Z pinout, MP4060GK-Z application, or MP4060GK-Z equivalent, this IC enables warm-sunset dimming via dedicated DIM pin modulation, supports both leading- and trailing-edge TRIAC dimmers with adaptive detection (t_LD = 86–134 µs, t_TL = 388–602 µs), and integrates cycle-by-cycle OCP (V_OCP = 2.56–2.86 V) and auto-restart fault protection.

Technical Context

The MP4060GK-Z implements real-current control using primary-side sensing-deriving LED output current (I_OUT) from V_REF = 0.414 V, turn ratio N, and sense resistor R_S-eliminating secondary-side feedback. Its multiplier circuit (VMULT linear range: 0–3 V, gain K = 0.9–1.6 1/V) shapes sinusoidal input current for PF > 0.9 at full load.

Boundary-conduction mode (BCM) operation minimizes switching losses via zero-current detection (V_{ZCD_T} = 0.27–0.33 V, t_{ZCD_LEB} = 0.95–3.36 µs), while adaptive dimmer detection uses VMULT thresholds (e.g., VMULT_LD_LOW = 0.08–0.12 V, VMULT_TL_HIGH = 0.25–0.47 V) and timing windows to distinguish leading- vs. trailing-edge phase-cut waveforms.

Key Specifications

Pinout & Package

MP4060GK-Z is housed in a thermally enhanced MSOP-10 package with exposed pad, supporting high-power-density LED driver designs requiring efficient heat transfer and compact layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP4060GK-Z, MP4061GK-Z reduces external component count but sacrifices flexibility in isolated topologies, while UCC28810DR offers broader vendor support yet requires additional circuitry for warm-sunset dimming and thermal management.

Availability

MP4060GK-Z is available at Aetrix Electronics and suitable for residential LED lamps, commercial downlights, and industrial high-bay lighting requiring stable component supply, long-lifecycle assurance, and RoHS-compliant manufacturing.

Supply support for MP4060GK-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 design centers across Asia and North America.

The MP4060 belongs to MPS's LED lighting controller product line, engineered specifically for high-line TRIAC-dimmable, PFC-compliant, primary-side regulated drivers targeting energy-efficient solid-state lighting.

FAQ

What dimmer types does MP4060GK-Z support?

The MP4060GK-Z supports both leading-edge (TRIAC) and trailing-edge (MOSFET-based) dimmers through adaptive detection using VMULT thresholds and timing windows (t_LD = 86–134 µs, t_TL = 388–602 µs). It achieves >95% compatibility with common residential and commercial dimmers without external configuration.

How does the real-current control method eliminate secondary-side feedback?

Real-current control calculates LED output current from primary-side parameters: V_REF = 0.414 V, transformer turns ratio N, and sense resistor R_S, per I_OUT ≈ (V_REF × N) / (2 × R_S). This eliminates optocouplers and TL431 references while maintaining ±3% current accuracy across line/load variations.

What is the function of the BD pin?

The BD pin is an open-drain output driving an external bleeder FET. During TRIAC off-phase, BD pulls low to disable the bleeder, reducing standby power consumption by >70% versus always-on designs-critical for meeting Energy Star and ERP Tier 2 requirements.

Can MP4060GK-Z be used in isolated flyback topologies?

Yes-the MP4060GK-Z is explicitly designed for isolated flyback configurations, as confirmed by its ZCD pin interface to auxiliary winding, integrated OVP detection (V_{ZCD_OVP} = 4.9–5.7 V), and support for transformer-coupled current sensing. Typical Application diagrams in Rev. 1.0 show dual-channel isolated implementations.

What protection features include auto-restart behavior?

All fault protections-output over-voltage (OVP), output short-circuit (SCP), winding short-circuit, over-temperature (OTP), and over-current (OCP)-trigger controlled shutdown and automatically restart once VCC drops below V_CCEN = 6.7–7.6 V, ensuring robust recovery without manual intervention.

How does the DIM pin enable warm-sunset dimming?

The DIM pin delivers programmable current (source: 2–4 mA; sink: 1.5–4 mA) to drive an external dummy load or CCT-mixing circuit. By modulating DIM duty ratio in sync with TRIAC phase angle, it shifts color temperature from warm white (2700K) to cool white (6500K) while dimming-enabling seamless warm-sunset effects.

What is the minimum off-time limitation and why is it used?

The MP4060GK-Z enforces t_{OFF_MIN} = 4–8 µs to cap maximum switching frequency, reducing EMI emissions and gate-drive losses. This is especially critical in high-line applications (265VAC) where uncontrolled frequency rise could exceed CISPR-15 conducted noise limits.