Monolithic Power Systems Inc. MP4033GSE-P

Overview

MP4033GSE-P from Monolithic Power Systems is a TRIAC-dimmable, primary-side-control offline LED controller with integrated active PFC, designed for isolated flyback LED drivers up to 50W. It delivers accurate LED current regulation using real-current control, operates in boundary-conduction mode, and supports analog dimming via PWM input and warm sunset color-temperature control via the DIM pin.

For engineers reviewing the MP4033GSE-P datasheet, MP4033GSE-P pinout, MP4033GSE-P application, or MP4033GSE-P equivalent, key selection considerations include TRIAC dimmer compatibility (leading/trailing edge), programmable NTC-based thermal fold-back, ZCD-based zero-current switching, VCC auto-recharge startup behavior, and SOIC-14 package-specific pin mapping for NTC and DIM functionality.

Technical Context

The MP4033GSE-P implements adaptive dimmer-type detection by analyzing MULT pin waveform timing (tLEADING ≤134 µs for leading edge; tTRAILING ≥388 µs for trailing edge) and voltage thresholds (VMULT_LD_LOW = 0.10 V, VMULT_TL_HIGH = 0.45 V). Its real-current control loop uses VREF = 0.414 V and multiplier gain K = 1.28 1/V to shape primary current in phase with rectified line voltage, achieving >0.9 PF.

Boundary-conduction operation is enforced via ZCD-triggered MOSFET turn-on after tZCD_LEB (1.18–3.36 µs), with minimum off time tOFF_MIN = 5.3 µs (normal) or 10 µs (NTC-active). Protection logic includes cycle-by-cycle current limiting at VOCP = 2.70 V, OVP at VZCD_OVP = 5.30 V with tOVP_LEB blanking, and auto-restart on all faults via VCCEN = 7.0 V UVLO re-enable threshold.

Key Specifications

Pinout & Package

MP4033GSE-P is supplied in SOIC-14 package with exposed pad (RoHS-compliant, lead-free). Pin functions are validated per MPS datasheet Rev. 1.0: pins 1–4 and 7–14 assigned; pins 1, 7, 8, 14 are NC; pin 5 is DIM; pin 6 is D; pin 9 is GND; pin 10 is COMP; pin 11 is NTC; pin 12 is S; pin 13 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP4032GSE-P, MP4033GSE-P adds NTC-based thermal fold-back and DIM-driven CCT control-critical for high-reliability residential/commercial lighting-while BP5778E requires optocoupler feedback and delivers lower PF, making it unsuitable for new energy-efficient designs targeting ENERGY STAR or DLC certification.

Availability

MP4033GSE-P is available at Aetrix Electronics and suitable for residential dimmable downlights, commercial office troffer drivers, and industrial high-bay lighting requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for MP4033GSE-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, and global distribution through authorized partners.

The MP4033 product line targets cost-sensitive, high-efficiency LED lighting applications requiring TRIAC dimmer compatibility, primary-side regulation, and integrated PFC-enabling compact, reliable, and standards-compliant drivers for universal AC input.

FAQ

What is the function of the DAMP pin on MP4033GSE-P?

The DAMP pin drives an external MOSFET to suppress voltage ringing at the drain node during turn-off transitions. It sources 290–450 µA when VDAMP = 5 V and sinks 70–110 µA when VDAMP = 0.3 V, with clamping at 15 V maximum. This reduces EMI and prevents false triggering of over-voltage protection.

How does MP4033GSE-P achieve high power factor without a dedicated PFC controller?

It uses the MULT pin to sample rectified line voltage and generate a sinusoidal reference for the current comparator. The multiplier gain (K = 1.28 1/V) shapes primary peak current to match line voltage phase, achieving >0.9 PF in boundary-conduction mode without additional ICs or boost stages.

Can MP4033GSE-P operate without an NTC thermistor?

Yes-NTC is optional. If unconnected, thermal fold-back is disabled and the device operates at full output current across its −40°C to +125°C junction range. The NTC pin defaults to high-impedance; no pull-up or pull-down is required for basic operation.

What protection features auto-restart after fault clearance?

All protections-including output over-voltage, output short-circuit, winding short, ZCD short, supply UVLO, and over-temperature-trigger auto-restart. After fault, VCC discharges to VCCEN = 7.0 V, re-enabling the internal charging circuit and resuming normal operation without manual reset.

Is the DIM pin capable of driving external MOSFETs directly?

Yes-the DIM pin sources 2–4 mA and sinks 1.5–4 mA, sufficient to drive small-signal MOSFET gates (e.g., 2N7002) or bipolar transistors in warm-sunset configurations. For higher-current loads, a buffer stage is recommended to maintain timing fidelity and avoid loading the internal driver.

What is the minimum recommended sense resistor value for the S pin?

Based on VOCP = 2.70 V and tLEB_OCP = 350 ns, the minimum Rs is determined by peak current limit: Rs ≥ VOCP / I_{pk_max}. For typical 50W designs with I_{pk_max} ≈ 1.2 A, Rs ≥ 2.25 Ω. Lower values risk premature OCP triggering due to noise; 2.2 Ω to 4.7 Ω is the validated range per EV4033-K-00A reference design.

Does MP4033GSE-P support both leading-edge and trailing-edge dimmers simultaneously?

Yes-adaptive detection occurs every AC half-cycle. The IC evaluates VMULT timing (tLEADING/tTRAILING) and voltage thresholds (VMULT_LD_HIGH/VMULT_TL_HIGH) in real time, selecting leading-edge or trailing-edge control logic before each conduction interval, ensuring seamless compatibility with mixed-dimmer installations.