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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > AC DC Converters, Offline Switches

Monolithic Power Systems Inc. HFC0310GS

Name: HFC0310GS
Brand: Monolithic Power Systems Inc.
SKU: HFC0310GS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HFC0310GS

Manufacturer:: Monolithic Power Systems Inc.

Category:: AC DC Converters, Offline Switches

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: HFC0310GS.pdf

Description:: IC REG CTRLR FLYBK PWM 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:3,282

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Product details

Overview

HFC0310GS from Monolithic Power Systems is a programmable fixed-frequency flyback controller in SOIC8 package, implementing peak current-mode control with burst-mode operation for <12 μA start-up current, 9.5 V typical VCC UVLO threshold, and 0.97 V typical current-sense threshold. It serves as the core PWM timing and protection manager in isolated AC/DC flyback converters for metering and adapter applications.

For engineers reviewing the HFC0310GS datasheet, HFC0310GS pinout, HFC0310GS application, or HFC0310GS equivalent, key selection criteria include programmable 100–600 kHz switching frequency via FSET capacitor, active-burst mode for <50 mW standby power, integrated slope compensation, and dual-threshold FB-based overload detection with 82 ms delay.

Technical Context

The HFC0310GS uses peak-current-mode control with internal slope compensation (42 mV/μs at 100 kHz) and leading-edge blanking (280 ns typical on CS pin) to stabilize loop dynamics and suppress noise-induced false triggering. Its burst-mode logic responds to FB voltage thresholds (0.50 V entry, 0.73 V exit) to gate switching pulses during light-load conditions.

VCC management includes hysteresis-based UVLO (12 V turn-on, 9.5 V turn-off), over-voltage protection (23 V trip), and auto-recovery fault handling on PRO, OLP, SCP, and OTP. The PRO pin enables external fault injection with 3.3 V threshold and 0.2 V hysteresis, supporting input OVP or system-level shutdown coordination.

Key Specifications

Parameter	Value and Actual Design Meaning
Switching Frequency	Programmable 100–600 kHz via FSET capacitor; enables EMI filter cost reduction through frequency shaping ±3.5% spread.
VCC UVLO Threshold	Turn-on at 12 V (±1.2 V), turn-off at 9.5 V (±1.0 V); ensures reliable start-up from auxiliary winding with hysteresis margin.
Start-Up Current	20 μA max; minimizes bias resistor power loss and enables high-impedance VCC charging networks.
Current-Sense Threshold	0.97 V typical; sets primary MOSFET peak current limit with internal 3.5× FB-to-current division ratio.
Burst Mode FB Thresholds	Enters at 0.50 V, exits at 0.73 V; provides stable no-load regulation with low standby power without oscillation.
Thermal Shutdown	150 °C trip, 110 °C recovery; protects die integrity during sustained overload or poor heatsinking.
PRO Pin Threshold	3.3 V with 0.2 V hysteresis; allows external fault signaling (e.g., input OVP) with clean auto-restart behavior.

Pinout & Package

The HFC0310GS is housed in a standard SOIC8 package (5.0 mm × 6.2 mm, 1.27 mm pitch) with exposed pad not electrically connected. Thermal resistance θ_JA = 96 °C/W on 4-layer PCB per JESD51-7.

Pin/Terminal	Circuit Role	Design Meaning
1 FSET	Frequency programming input	Connects to GND via capacitor to set switching frequency; internal 50 μA current source charges cap to 0.87 V max.
2 VCC	IC power supply rail	Accepts 11–20 V input; powers internal circuitry and drives external MOSFET gate; features UVLO and OVP.
3 NC	No-connect terminal	Internally unconnected; must remain floating or grounded-no external connection required.
4 Drv	Gate drive output	Sources 25 Ω / sinks 13 Ω; delivers PWM signal to external N-channel MOSFET gate with soft-start ramp.
5 CS	Primary current sense input	Monitors MOSFET source voltage; triggers shutdown at 1.72 V for short-circuit; includes 280 ns LEB.
6 PRO	External protection input	Pulled up to enable shutdown when voltage exceeds 3.3 V; supports hysteresis-based fault recovery.
7 GND	Power and signal reference	Common return for VCC, CS, FB, PRO, and FSET; requires low-impedance PCB plane for noise immunity.
8 FB	Feedback voltage input	Receives optocoupler output; controls duty cycle via internal 14.5 kΩ pull-up and 4.55 V reference; detects OLP and burst mode.

Key Features

Feature	Design Value
Programmable frequency up to 600 kHz	Enables EMI compliance across wide input ranges while maintaining transformer size efficiency.
Active-burst mode with dual FB thresholds	Reduces standby power to <50 mW without audible transformer whine or output regulation drift.
Integrated slope compensation	42 mV/μs at 100 kHz prevents subharmonic oscillation in continuous conduction mode flyback designs.
Internal soft-start (3 ms)	Gradually increases current limit to avoid inrush stress on primary MOSFET and secondary rectifier.
Auto-recovery protections	OLP (82 ms delay), SCP, OVP, OTP, and PRO all restart automatically after fault clearance-no latch required.

Applications

Smart Electricity Meter Power Supply

Industrial AC/DC Adapter

Use Scenario: Provides isolated 12 V/0.8 A and dual 8 V outputs from 85–420 VAC input in revenue-grade metering systems.

IC Role / Device Role / Timing Role: Flyback controller managing primary-side PWM, burst-mode sequencing, and multi-rail feedback coordination via optocoupler-coupled FB pin.

Use Value: Meets IEC 62053-21 standby power <0.5 W requirement using active-burst mode and <20 μA start-up current.

Use Scenario: Powers industrial PLC I/O modules requiring 12 V @ 0.8 A and two auxiliary 8 V rails from universal AC input.

IC Role / Device Role / Timing Role: Core timing and protection engine implementing frequency shaping to pass CISPR-22 Class B conducted EMI without oversized filters.

Use Value: ±3.5% frequency spread reduces peak EMI by >10 dB, cutting filter BOM cost by eliminating ≥2 Y-capacitors and common-mode chokes.

USB-C PD-Compatible Charger

Building Automation Sensor Hub PSU

Use Scenario: Delivers 12 V/0.8 A output with fast transient response for USB-C PD sink negotiation circuitry in compact wall adapters.

IC Role / Device Role / Timing Role: Peak-current-mode flyback controller enabling tight output regulation during dynamic load steps via fast loop compensation.

Use Value: Internal slope compensation and 280 ns CS blanking ensure stable 100 kHz operation under 50%–100% load step without external compensation components.

Use Scenario: Powers Zigbee/BLE sensor nodes and analog front-ends in HVAC controllers with strict <100 mW no-load consumption.

IC Role / Device Role / Timing Role: Low-quiescent flyback controller executing burst-mode gating based on FB voltage hysteresis to minimize idle losses.

Use Value: Dual FB thresholds (0.50 V/0.73 V) prevent burst oscillation and maintain ±3% output regulation across 10 μA–800 mA load range.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
UCC28740DR	Fixed 66 kHz frequency; no FSET programmability; higher 100 μA start-up current; no frequency shaping.	Lacks burst-mode FB hysteresis tuning; uses different OLP timing (fixed 128-cycle delay vs. 8192-cycle).	Select for cost-sensitive, fixed-frequency designs where EMI filtering is less constrained.
ICE5QSBG	Quasi-resonant operation; no programmable frequency; integrated 650 V MOSFET; higher 250 μA start-up current.	Requires no external MOSFET but lacks FSET flexibility and active-burst precision; optimized for <30 W.	Select when integrating primary switch reduces board area and thermal design complexity outweighs frequency tuning needs.

Compared with UCC28740DR and ICE5QSBG, the HFC0310GS offers unique FSET-based frequency agility (100–600 kHz), lower start-up current (20 μA), and precise dual-threshold burst control-making it optimal for EMI-sensitive, ultra-low-standby, and multi-output flyback designs requiring layout flexibility.

Availability

HFC0310GS is available at Aetrix Electronics and suitable for smart meter power supplies, industrial AC/DC adapters, and USB-C PD-compatible chargers requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for HFC0310GS 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 manufacturing partnerships.

The HFC0310GS belongs to MPS's AC/DC flyback controller product line, engineered specifically for high-efficiency, low-standby-power isolated power conversion in utility metering, industrial adapters, and IoT edge devices.

FAQ

What is the minimum FSET capacitor value needed to achieve 600 kHz operation?

The HFC0310GS achieves 600 kHz with a 120 pF capacitor on FSET, calculated using f_S = I_FSET / (C × V_FSETmax) where I_FSET = 50 μA and V_FSETmax = 0.87 V. Lower capacitance yields higher frequency, but values below 100 pF risk instability due to parasitic effects and reduced noise margin.

How does the PRO pin interact with other protection functions like OLP or OTP?

The PRO pin operates independently of internal protections: when PRO voltage exceeds 3.3 V, the IC shuts down immediately regardless of OLP, OTP, or SCP status. Recovery occurs only after PRO falls below 3.1 V (3.3 V – 0.2 V hysteresis), and all internal faults must also be cleared before normal operation resumes.

Can the HFC0310GS operate without an external MOSFET?

No-the HFC0310GS is a controller-only IC with no integrated power switch. Pin 4 (Drv) provides gate drive for an external N-channel MOSFET; attempting to operate without one results in no power transfer and undefined behavior on CS and FB pins.

What is the purpose of the NC pin (Pin 3), and can it be tied to GND?

Pin 3 is internally unconnected and must remain floating or be tied to GND-never left open or pulled to VCC. Grounding it improves noise immunity in high-dV/dt environments but has no functional impact on regulation or protection behavior.

Does the HFC0310GS support synchronous rectification?

No-the HFC0310GS does not generate or synchronize secondary-side gate drive signals. It relies on diode rectification; synchronous rectifier controllers (e.g., MP6908) require separate implementation and coordination via optocoupler or auxiliary winding sensing.

How is the over-load protection delay time affected by switching frequency?

The OLP delay is fixed at 82 ms when f_S = 100 kHz, scaling inversely with frequency: at 200 kHz, delay reduces to ~41 ms; at 50 kHz, it extends to ~164 ms. This ensures consistent energy-limiting behavior across the full 100–600 kHz operating range.

HFC0310GS Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Active

Output Isolation:: Isolated

Internal Switch(s):: No

Voltage - Breakdown:: -

Topology:: Flyback

Voltage - Start Up:: 12 V

Voltage - Supply (Vcc/Vdd):: 8V ~ 20V

Duty Cycle:: -

Frequency - Switching:: Up to 600kHz

Power (Watts):: -

Fault Protection:: Over Load, Over Temperature, Over Voltage, Short Circuit

Control Features:: Frequency Control

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Supplier Device Package:: 8-SOIC

Mounting Type:: Surface Mount

HFC0310GS FAQ

1.How can I place an order for HFC0310GS through Aetrix?

Please submit a Request for Quotation (RFQ) for HFC0310GS on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for HFC0310GS reliable?

The price and inventory of HFC0310GS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HFC0310GS is usually 5 days.

3.What payment methods are accepted for HFC0310GS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HFC0310GS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HFC0310GS?

HFC0310GS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HFC0310GS order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for HFC0310GS?

For technical support, including HFC0310GS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HFC0310GS requirements.

6.How does Aetrix verify that HFC0310GS is sourced from the original manufacturer or authorized distributors?

All HFC0310GS products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that HFC0310GS meets industry standards.

7.What is the process for return or replacement of HFC0310GS?

All HFC0310GS units undergo pre-shipment inspection (PSI). If there is an issue with HFC0310GS, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The HFC0310GS part is unused and in its original packaging.

Return procedure for HFC0310GS:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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