Monolithic Power Systems Inc. MP4050GS-P

Overview

MP4050GS-P from Monolithic Power Systems is a non-isolated, constant-current LED driver IC with an integrated 500V/7.2Ω MOSFET, designed for AC/DC LED bulk replacement in 85–265VAC input systems. It delivers stable 115mA output current at 40V with internal averaging current feedback, operates above 22kHz to suppress audible noise, and includes thermal shutdown, open/short lamp protection, and VCC UVLO.

For engineers reviewing the MP4050GS-P datasheet, MP4050GS-P pinout, MP4050GS-P application, or MP4050GS-P equivalent, key selection factors include its 500V drain rating, SOIC8 package thermal resistance (θJA = 96°C/W), integrated high-voltage startup current source, and PRO-pin-based fault detection for lamp integrity monitoring in cost-sensitive lighting designs.

Technical Context

The MP4050GS-P implements a primary-side controlled buck topology with internal peak-current-mode regulation. Its feedback loop samples average LED current via the SOURCE pin, comparing a 0.194V internal reference against a voltage derived from the sense resistor (R1) to maintain constant output current independent of line or temperature variation.

Protection logic is tightly coupled to the PRO pin: open-lamp detection triggers when PRO voltage exceeds 2.0V (typ), short-lamp when it falls below 0.39V (typ); both initiate hiccup-mode restarts. Thermal shutdown activates at 150°C with 60°C hysteresis, while VCC management uses dual-threshold UVLO (4.4V ON / 4.65V OFF) and a dedicated 2.35V protection threshold (VCCPRO) for fault recovery.

Key Specifications

Pinout & Package

MP4050GS-P is housed in an SOIC-8 package with exposed pad for enhanced thermal dissipation (θ_JA = 96°C/W, θ_JC = 45°C/W). The pinout supports non-isolated buck configuration with high-side switching and primary-side sensing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar constant-current LED driver applications.

Compared with MP4051GS-P, MP4050GS-P trades programmable frequency for lower unit cost and simpler layout; versus BP5758D, it delivers integrated lamp-status monitoring and robust hiccup-mode protection-critical for UL/IEC-certified lighting products.

Availability

MP4050GS-P is available at Aetrix Electronics and suitable for LED bulk lamp replacement, industrial panel lighting, and automotive interior lighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP4050GS-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 two decades of leadership in DC/DC conversion and LED driver innovation.

The MP4050 product line targets cost-sensitive, non-isolated LED lighting applications-delivering integrated high-voltage switching, primary-side regulation, and comprehensive fault protection in compact packages.

FAQ

What is the maximum continuous output power achievable with MP4050GS-P in SOIC8 package at 90°C ambient?

At 90°C ambient and 265VAC input, the SOIC8-packaged MP4050GS-P delivers up to 350mA × 40V = 14W in universal-input configurations, as confirmed by Figure 10's V-I curve. Derating begins above 90°C due to thermal shutdown activation at 150°C junction temperature, with 60°C hysteresis enabling safe recovery.

Can MP4050GS-P operate from a pure DC input, and what is the valid voltage range?

Yes, MP4050GS-P supports DC input operation across 120–375VDC, matching the peak voltage of 85–265VAC after full-wave rectification. The internal 500V MOSFET and HV startup current source eliminate need for auxiliary supplies, enabling direct DC bus connection in battery-backed or PoE-powered lighting systems.

How does the PRO pin detect open and short lamp conditions without secondary-side sensing?

The PRO pin monitors voltage across a resistive divider (R2/R3) connected between LED+ and LED−. During MOSFET off-time, open lamp causes PRO voltage to rise above 2.0V (OVP threshold); short lamp pulls it below 0.39V (UVP threshold). This primary-side sampling avoids optocouplers or secondary controllers.

What is the purpose of the 200ns leading-edge blanking (LEB) function?

The 200ns LEB disables the current comparator immediately after MOSFET turn-on to ignore parasitic current spikes caused by circuit stray capacitance and diode reverse recovery. This prevents premature switching-off and ensures accurate peak-current limiting during normal conduction.

Is an external VCC capacitor required, and what value is recommended?

Yes-a 2.2–4.7μF ceramic or low-ESR electrolytic capacitor is mandatory between VCC and GND. It stores energy during MOSFET on-time to sustain bias supply during off-time, and its value directly impacts UVLO hysteresis stability and hiccup-mode restart timing per the equation t_restart = C_VCC × (4.65V − 2.37V) / 18μA.

Does MP4050GS-P support analog or PWM dimming, and how is it implemented?

MP4050GS-P does not integrate native dimming interfaces. Dimming is implemented externally: analog dimming via modulation of the sense resistor (R1) voltage, or PWM dimming by pulsing the AC input using a TRIAC or MOSFET switch upstream-leveraging the IC's inherent ability to restart cleanly after input interruption.