Monolithic Power Systems Inc. MP4032-1GS-P

Overview

MP4032-1GS-P from Monolithic Power Systems is a TRIAC-dimmable, primary-side-controlled offline LED driver IC with an integrated 500V/1A MOSFET, operating in boundary-conduction mode to achieve >0.9 power factor and ±3% LED current accuracy without secondary feedback. It delivers up to 6W output power, supports flicker-free phase-cut dimming down to 5% brightness, and integrates VCC UVLO, OVP, OCP, SCP, and OTP protections for residential and commercial solid-state lighting.

For engineers reviewing the MP4032-1GS-P datasheet, MP4032-1GS-P pinout, MP4032-1GS-P application, or MP4032-1GS-P equivalent, this device is selected for cost-sensitive, single-stage AC/DC LED drivers requiring high PF, wide dimming range, and simplified transformer design-especially where secondary-side sensing and optocoupler isolation are eliminated.

Technical Context

The MP4032-1GS-P implements proprietary real-current control by reconstructing secondary LED current from primary-side CS voltage and MULT-derived line-phase reference, enabling accurate regulation without optocouplers or secondary shunt regulators. Its multiplier-based PFC loop shapes primary peak current to match rectified input voltage, achieving >0.9 PF at 120VAC.

Built-in zero-current detection (ZCD) triggers MOSFET turn-on at valley voltage, minimizing switching losses and EMI; combined with 310ns leading-edge blanking on CS and 1.9μs OVP blanking, it ensures robust operation under transient line and load conditions. The internal 500V MOSFET eliminates external HV switch requirements while supporting auto-restart after fault clearance via VCC hysteresis.

Key Specifications

Pinout & Package

MP4032-1GS-P is housed in an SOIC8-7A package (7.0mm × 4.9mm, 1.27mm pitch), optimized for thermal dissipation (θJA = 96°C/W) and creepage/clearance compliance in isolated LED drivers.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar primary-side-controlled LED driver applications.

Compared with NCL30001DR2G and AL1676S16TR-G1, MP4032-1GS-P delivers superior integration (500V MOSFET + DRAIN charger), tighter current regulation (±3% vs. ±5–8%), wider dimming range (5% vs. 10%), and higher PF (>0.9 vs. ≤0.85), making it optimal for next-generation energy-efficient, dimmable LED lamps.

Availability

MP4032-1GS-P is available at Aetrix Electronics and suitable for residential LED retrofit lamps, commercial downlights, and industrial panel lighting requiring stable component supply, long-lifecycle support, and RoHS-compliant manufacturing.

Supply support for MP4032-1GS-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 DC/DC converters, LED drivers, and motor drivers.

The MP4032 product line targets cost-sensitive, TRIAC-dimmable LED lighting applications demanding high power factor, flicker-free dimming, and simplified system design through primary-side regulation and integrated power switches.

FAQ

What is the maximum input voltage the MP4032-1GS-P can withstand?

The MP4032-1GS-P features an integrated 500V drain-source breakdown voltage MOSFET, allowing direct operation from universal 85–265VAC mains without external HV protection. Absolute maximum drain-source voltage is rated at +500V, with recommended continuous operation below 450V to ensure long-term reliability under surge conditions.

Does MP4032-1GS-P require an external current-sense resistor?

Yes-the CS pin requires an external precision current-sense resistor connected between Pin 6 (CS) and GND to set LED current. The typical value is calculated as Rs = 0.403V / ILED; for 350mA output, Rs = 1.15Ω ±1%. This resistor directly determines regulation accuracy and must be placed with Kelvin connections per layout guidelines.

How does the MP4032-1GS-P achieve high power factor without a dedicated PFC controller?

It uses a multiplier-based analog PFC loop: the MULT pin samples rectified line voltage, and its signal modulates the current comparator reference. Combined with boundary-conduction mode and real-current control, this forces primary peak current to track the sinusoidal input voltage envelope-achieving >0.9 PF without a separate boost stage or digital controller.

Can MP4032-1GS-P operate without an auxiliary winding?

No-the ZCD pin requires connection to an auxiliary winding to detect zero-current crossing for valley switching and OVP monitoring. The auxiliary winding also powers VCC after startup. Omitting it disables critical protection and regulation functions; the IC will not enter normal operation.

What is the purpose of the NC pin (Pin 7) on MP4032-1GS-P?

Pin 7 is a no-connect terminal-internally unconnected and electrically isolated. It must remain unpopulated and unconnected on the PCB. Routing traces or placing components near this pin may introduce parasitic coupling; MPS recommends leaving it as a keep-out zone per the SOIC8-7A footprint.

Is MP4032-1GS-P compliant with IEC 61000-3-2 Class C?

Yes-when implemented per the reference design in AN055 (e.g., with proper EMI filter, RCD snubber, and transformer turns ratio), the MP4032-1GS-P achieves >0.9 power factor and <30% THD at full load, meeting IEC 61000-3-2 Class C harmonic limits for lighting equipment up to 25W.

What thermal derating applies above 25°C ambient?

With θJA = 96°C/W, the device dissipates ≤1.3W at TA = 25°C. For every 1°C rise above 25°C, allowable power drops by 13.5mW (1.3W / 96°C). At 70°C ambient, max continuous power is reduced to ~0.72W-requiring careful heatsinking or output power derating in enclosed fixtures.