Monolithic Power Systems Inc. HFC0500GS-P

Overview

HFC0500GS-P from Monolithic Power Systems is a fixed-frequency current-mode flyback controller with internal slope compensation, designed for medium-power offline AC/DC power supplies. It delivers ultra-low no-load power consumption (≤79 mW at 265 VAC), supports frequency foldback down to 25 kHz, and enters burst mode below 0.7 V FB to meet EuP Lot 6 standby requirements. Its integrated HV startup current source, X-cap discharge function, and adjustable overpower compensation enable robust, high-efficiency operation in universal-input adapters.

For engineers reviewing the HFC0500GS-P datasheet, HFC0500GS-P pinout, HFC0500GS-P application, or HFC0500GS-P equivalent, key selection considerations include its SOIC8-7A package, 65 kHz nominal switching frequency, 700 V HV pin rating, burst-mode entry/exit thresholds (0.7 V / 0.8 V FB), and thermal shutdown with 25 °C hysteresis - all critical for designing compact, low-standby-loss flyback converters.

Technical Context

The HFC0500GS-P implements fixed-frequency current-mode control with 25 mV/μs internal slope compensation, enabling stable continuous conduction mode (CCM) operation above 50% duty cycle without subharmonic oscillation. Its dual-stage light-load management includes frequency foldback (21–30 kHz range) below 1.8 V FB and burst-mode activation below 0.7 V FB, reducing switching losses while avoiding audible noise.

It integrates a 700 V-rated HV pin with brown-out detection (95–119 V turn-on, 86–110 V turn-off), programmable timer-based OLP (40 ms delay), and smart X-cap discharge via controlled HV current sourcing after AC removal. The DRV output features clamped high-side drive (13.4 V clamp), 13 ns rise time, and 23 ns fall time for direct MOSFET gate control.

Key Specifications

Pinout & Package

Package: SOIC8-7A - 8-pin surface-mount package with exposed pad (not thermally enhanced), footprint compatible with industry-standard SOIC-8 but with modified pin 7 (GND) configuration per MPS specification.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-frequency flyback controller applications.

Compared with UCC28630 and ICE2QS03, the HFC0500GS-P uniquely combines ultra-low no-load power (<79 mW), integrated X-cap discharge, and fixed-frequency jittering - delivering superior standby efficiency and EMI performance in space-constrained universal-input flyback designs.

Availability

HFC0500GS-P is available at Aetrix Electronics and suitable for AC/DC adapters, offline battery chargers, and LCD monitor power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant green-mode operation.

Supply support for HFC0500GS-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.

The HFC0500GS-P belongs to MPS's Green-Mode Flyback Controller product line, engineered specifically for ultra-low standby power, high integration, and simplified design of universal-input offline SMPS in consumer and industrial applications.

FAQ

What is the maximum allowable input voltage on the HV pin?

The HV pin has an absolute maximum rating of 700 V, with guaranteed operation up to 380 V DC input. Brown-out detection activates between 86–110 V (turn-off) and 95–119 V (turn-on), making it suitable for universal 85–265 VAC inputs after bridge rectification.

How does the X-cap discharge function eliminate external resistors?

The HFC0500GS-P uses its HV pin as a controlled current source triggered after AC removal: it applies 32-cycle detection, then 16-cycle discharge, followed by repeated 48-cycle discharges until X-cap voltage drops to VCC level - removing need for permanent bleed resistors and their associated no-load loss.

Can the burst mode be disabled?

No - burst mode is internally hardwired and activates automatically when FB falls below 0.7 V. It cannot be disabled via external pins or programming; this ensures guaranteed EuP Lot 6 compliance without design-dependent configuration errors.

What is the purpose of the TIMER pin's dual-blanking function?

The TIMER pin incorporates two independent blanking windows: one for OLP timeout (40 ms with CTIMER = 47 nF) and another for brown-out detection (same timing). This prevents false triggering during transient events like cold-start or line dips while maintaining precise fault response.

Does the HFC0500GS-P require an external slope compensation network?

No - it includes internal slope compensation of 25 mV/μs (typical), eliminating external components. This enables stable CCM operation above 50% duty cycle without subharmonic oscillation, simplifying transformer design for universal-input applications.

How is overload protection (OLP) configured?

OLP is triggered when FB exceeds 3.7 V for 40 ms (with CTIMER = 47 nF). The timer starts only after FB remains above threshold - preventing false trips during startup or short transients - and latches off DRV upon timeout unless reset by VCC discharge.

What is the recommended VCC capacitor value?

A minimum 10 μF ceramic or low-ESR electrolytic capacitor is recommended. Larger values improve brown-out immunity but increase start-up time; the capacitor must sustain VCC above 7.3 V during worst-case no-switching conditions, especially at low line.