Monolithic Power Systems Inc. MP4034GS-P

Overview

MP4034GS-P from Monolithic Power Systems is a primary-side-controlled offline LED driver IC with integrated 700V MOSFET, delivering precise constant-current regulation up to 7W in flyback DCM topology. It eliminates opto-coupler and secondary feedback components, supports universal AC input (85–265VAC), and features dual-level over-voltage protection (4.0V/6.35V FB threshold) for LED string safety.

For engineers reviewing the MP4034GS-P datasheet, MP4034GS-P pinout, MP4034GS-P application, or MP4034GS-P equivalent, key selection criteria include its SOIC8-7A package, 365–395mA current limit, variable off-time control, natural EMI spectrum shaping, and open-circuit protection with −0.15V FB falling-edge detection.

Technical Context

The MP4034GS-P implements primary-side regulation via auxiliary winding voltage sampling to reconstruct secondary current without isolation components. Its ZCD-based DCM detection ensures operation only when secondary diode conduction ends, maintaining fixed 0.4 duty cycle for stable output current.

It integrates a 700V drain-rated MOSFET with 10–13Ω R_DS(on), a 550µA high-voltage startup current source, and dual OVP thresholds sampled 3.5µs after switch turn-off. Thermal shutdown activates at 150°C with 30°C hysteresis, and leading-edge blanking (230–370ns) prevents false current-sense triggering.

Key Specifications

Pinout & Package

MP4034GS-P is housed in a SOIC8-7A package (JEDEC MS-012 compliant), featuring exposed pad for enhanced thermal dissipation and optimized layout for flyback transformer coupling. Pin 1 (VCC) requires 0.1µF ceramic decoupling; Pins 2,4,5,6 are GND (multi-ground configuration reduces noise); Pin 3 (FB) senses reflected auxiliary voltage; Pin 8 (Drain) connects directly to primary winding and supplies internal HV startup current.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar offline LED driver applications.

Compared with MP4032GS-P, MP4034GS-P adds 200V MOSFET headroom and dual OVP for safer universal-input operation; versus MP4036GS-P, it trades 1W output headroom for lower gate charge and tighter current-limit tolerance (±4% vs ±6%), optimizing cost-performance balance for mainstream 6–7W LED drivers.

Availability

MP4034GS-P is available at Aetrix Electronics and suitable for LED street lighting, commercial downlights, and industrial panel indicator systems requiring stable component supply, RoHS compliance, and long-lifecycle support.

Supply support for MP4034GS-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 analog semiconductor company specializing in high-efficiency power management ICs, with over two decades of leadership in DC-DC converters, LED drivers, and motor drivers.

The MP4034 belongs to MPS's offline LED driver product line, engineered specifically for cost-sensitive, high-reliability AC-DC LED lighting applications where primary-side regulation, integrated HV MOSFETs, and comprehensive protection are mandatory.

FAQ

What is the maximum recommended output power for MP4034GS-P?

The MP4034GS-P is rated for up to 7W output power under typical conditions (TA = 25°C, SOIC8-7A package, adequate PCB copper area). This limit is constrained by thermal dissipation (θJA = 76°C/W) and internal MOSFET R_DS(on) (10–13Ω), not current limit alone. Derating is required above 70°C ambient or with reduced copper area.

Does MP4034GS-P require an external startup resistor?

No. The MP4034GS-P integrates a 550µA high-voltage current source that draws power directly from the Drain pin during startup, eliminating the need for an external high-voltage startup resistor. This reduces component count and improves reliability in high-voltage AC-DC applications.

How does the MP4034GS-P achieve constant-current regulation without secondary feedback?

It samples the auxiliary winding voltage during secondary conduction to reconstruct LED current using the transformer turns ratio and timing relationships. The FB pin voltage correlates to output current via N_P/N_AU × R_DOWN/(R_UP + R_DOWN) scaling, enabling precise primary-side current control without opto-couplers.

What is the purpose of the 300ns leading-edge blanking (LEB) window?

The LEB window (230–370ns typ.) disables the current-sense comparator immediately after MOSFET turn-on to prevent false triggering from parasitic ringing or voltage spikes across the sense resistor. This ensures accurate peak-current limiting and stable DCM operation across line/load conditions.

Can MP4034GS-P operate in continuous conduction mode (CCM)?

No. The MP4034GS-P is designed exclusively for discontinuous conduction mode (DCM) operation. Its DCM detection circuit monitors the FB pin for a 120mV falling edge; if absent, the IC halts switching to prevent CCM entry, ensuring predictable current regulation and simplified transformer design.

What is the minimum recommended copper area for thermal management on the SOIC8-7A package?

MPS recommends ≥1.5 cm² of 2-oz copper connected to the four GND pins (Pins 2,4,5,6) as a thermal plane. This achieves the specified θJA of 76°C/W on a 4-layer PCB per JESD51-7. Smaller copper areas increase junction temperature and may trigger thermal shutdown under full load.

How does the dual-level OVP function protect the LED string?

At first-level OVP (4.0V FB), switching frequency drops to hold output voltage constant-preventing LED overcurrent during moderate overvoltage. At second-level OVP (6.35V FB sustained for 3.5µs), the IC shuts down completely and discharges VCC, forcing a full restart only after VCC falls below UVLO-ensuring fail-safe response to catastrophic faults like open LED string.