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Monolithic Power Systems Inc. HF920GSE-P
- Part No.:
- HF920GSE-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- AC DC Converters, Offline Switches
- Package:
- 8-SOIC (0.154", 3.90mm Width), 7 Leads
- Datasheet:
-
HF920GSE-P.pdf
- Description:
- 900V FIXED FREQUENCY OFF-LINE RE
- Quantity:
- Payment:
- Shipping:
Inventory:4,007
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Product details
Overview
HF920GSE-P from Monolithic Power Systems is a monolithic 900V flyback switching regulator IC integrating a 15Ω/900V MOSFET, fixed-frequency peak-current-mode controller, and ultra-low standby power architecture. It delivers up to 9.5W at 230Vac±15% in SOIC8-7A package, supports programmable switching frequency up to 150kHz, achieves <30mW no-load consumption, and features burst-mode operation, frequency jittering, and frequency-doubling for magnetizing interference resilience - deployed in smart meters, industrial controls, and large appliances operating on poor AC grids.
For engineers reviewing the HF920GSE-P datasheet, HF920GSE-P pinout, HF920GSE-P application, or HF920GSE-P equivalent, this page provides verified technical context on its 900V integrated MOSFET operation, VCC UVLO hysteresis (4V), FB-based burst-mode thresholds (VBURL = 0.5V, VBURH = 0.7V), OLP counter (8192 cycles), and PRO pin protection with 0.2V hysteresis - all critical for reliable offline AC/DC design under wide-input, high-reliability constraints.
Technical Context
The HF920GSE-P implements peak-current-mode control with internal slope compensation and leading-edge blanking (tLEB1 = 385ns, tLEB2 = 350ns) to ensure stable regulation across line/load transients. Its proprietary 900V monolithic process integrates the power MOSFET and thermal sensor on-die, enabling precise over-temperature protection (OTP threshold = 150°C, recovery hysteresis = 30°C) without external thermistors.
Switching frequency is set externally via FSET resistor (e.g., 200kΩ yields 49kHz typical) and enhanced by ±3.5% jittering to reduce EMI peaks; frequency-doubling mode activates when FB reaches VOLP (3.65V), doubling fS to maintain regulation during transformer inductance degradation. Protection logic includes time-based OLP (8192-cycle timeout), SCP (VSCP = 1.5V), VCC OVP (25.5V), and auto-restart after fault clearance via VCCR (5.5V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Integrated MOSFET | 900V breakdown voltage, 15Ω RDS(ON) @ 25°C - enables direct connection to 420Vac rectified bus without external HV MOSFET. |
| Standby Power | <30mW no-load consumption - achieved via active burst mode with FB-controlled entry (VBURL = 0.5V) and exit (VBURH = 0.7V). |
| Switching Frequency | Programmable up to 150kHz via FSET resistor; ±3.5% jittering reduces EMI filter cost; doubles under OLP for robustness against inductance shift. |
| VCC UVLO | Turn-on at VCCH = 13V, turn-off at VCCL = 9V, hysteresis = 4V - ensures clean start-up and brown-out recovery using auxiliary winding supply. |
| Protection Setpoints | OVP = 25.5V (70μs delay), SCP = 1.5V on S pin, OLP = 3.65V on FB (8192-cycle timer), PRO = 3.1V with 0.2V hysteresis - all support auto-restart after fault clearance. |
| Thermal Management | On-die OTP at 150°C with 30°C hysteresis; θJA = 96°C/W (SOIC8-7A) - enables compact heatsinking with GND copper area (3cm²) per datasheet layout guidance. |
| Feedback Control | FB internal pull-up = 4.4V, Kdiv = 3.7 - defines primary current limit as VCS = VFB / Kdiv, capped at VCSL = 0.97V for output power limiting. |
Pinout & Package
HF920GSE-P is housed in an SOIC8-7A package (7-pin functional variant of standard SOIC-8, with Pin 7 internally connected to GND). The exposed pad is not electrically connected; thermal performance relies on GND copper area (3cm²) per datasheet layout recommendation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | IC power supply input | Accepts 10–24V; powers internal circuitry after start-up; UVLO hysteresis ensures stable enable/disable during brown-out. |
| 2 (FSET) | Frequency programming & mode control | Resistor-to-GND sets fS (e.g., 200kΩ → 49kHz); adding 1nF enables frequency-doubling under overload. |
| 3 (PRO) | External protection input | Pulled high to 3.1V triggers shutdown with 0.2V hysteresis; supports input OVP, UVP, or external OTP monitoring. |
| 4 (FB) | Feedback and protection sensing | Regulates output via optocoupler; detects burst-mode entry (0.5V), OLP (3.65V), and soft-start completion. |
| 5, 6, 7 (GND) | Signal and power ground | Common reference for FB, S, PRO, and VCC return; requires 3cm² copper pour for thermal management per datasheet. |
| 8 (D) | High-voltage drain terminal | Connects to rectified AC bus (up to 900V); supplies start-up current (2mA typical) before VCC takeover. |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic 900V MOSFET | Eliminates external HV switch and gate driver, reducing BOM count and PCB footprint in universal-input flyback designs. |
| Active Burst Mode | Reduces no-load consumption to <30mW by gating switching pulses based on FB voltage - critical for energy-certified smart meters. |
| On-Die Thermal Protection | OTP sensor co-integrated with 900V MOSFET die enables precise junction temperature monitoring without external components. |
| Frequency Jittering | ±3.5% spread-spectrum modulation lowers peak EMI amplitude, relaxing input filter requirements for PLC-compatible applications. |
| Frequency Doubling | Doubles fS under overload to maintain regulation when transformer inductance drops up to 50% - improves immunity to magnetic interference. |
| Internal Soft-Start | 6.7ms ramp limits inrush current and stress on primary MOSFET and secondary diode during power-up. |
Applications
| Smart Meter Power Supply | Industrial PLC Power Module |
|---|---|
|
Use Scenario: Primary-side auxiliary supply for electricity meters operating on unstable 85–420Vac grids with frequent sags and surges. IC Role / Device Role / Timing Role: Offline flyback controller regulating isolated 12.5V/300mA output; handles 50% inductance shift via frequency doubling during magnetic interference events. Use Value: Achieves <30mW no-load consumption to meet IEC 62053-21 Class 0.5S standby power limits while maintaining 85% efficiency at full load. |
Use Scenario: Compact, reliable 24V/200mA auxiliary supply for programmable logic controllers in factory automation cabinets. IC Role / Device Role / Timing Role: Fixed-frequency current-mode controller with burst mode and auto-restart OLP/SCP - sustains operation during transient overloads common in motor drive environments. Use Value: On-die OTP and 900V MOSFET withstand 4kV surge events per IEC 61000-4-5, eliminating need for external TVS clamping on primary side. |
| Large Appliance Control Board | Home Automation Hub Power |
|
Use Scenario: Isolated 5V/500mA supply for microcontroller and sensor interfaces in washing machines and HVAC systems. IC Role / Device Role / Timing Role: Integrated regulator with VCC UVLO hysteresis (4V) and soft-start - prevents erratic MCU resets during brown-out conditions on shared household circuits. Use Value: Reduces component count by 4 vs. discrete HV controller + MOSFET solution; SOIC8-7A footprint fits tight control board layouts. |
Use Scenario: Low-EMI 12V/150mA supply for Zigbee/Z-Wave hubs requiring coexistence with PLC communication on same power line. IC Role / Device Role / Timing Role: Programmable-frequency controller with ±3.5% jittering and frequency-doubling - suppresses radiated emissions in 1–30MHz band critical for CENELEC EN 50065 compliance. Use Value: Enables single-stage EMI filter design due to inherent spectral spreading, cutting BOM cost by ~$0.35 per unit vs. non-jittered alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar offline flyback regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP101GSE-P | 700V integrated MOSFET, lower RDS(ON) (10Ω), no frequency doubling, higher no-load consumption (~50mW) | Suitable only for ≤265Vac inputs; lacks magnetizing interference resilience needed in smart meter deployments. | Select only for cost-sensitive, low-voltage-input (<265Vac) applications where 900V rating is unnecessary. |
| UCC28632DR | 650V external MOSFET required, valley-switching topology, higher light-load efficiency but larger solution size | Requires gate driver, HV MOSFET, and additional protection ICs - increases BOM and layout complexity. | Prefer when designing for >90% full-load efficiency at 115Vac input; avoid when minimizing component count is primary goal. |
Compared with MP101GSE-P, HF920GSE-P adds 200V headroom and frequency doubling for grid-resilient operation; versus UCC28632DR, it trades valley-switching efficiency for monolithic simplicity and lower system-level EMI filtering cost.
Availability
HF920GSE-P is available at Aetrix Electronics and suitable for smart meter power supplies, industrial PLC modules, and large appliance control boards requiring stable component supply under extended lifecycle commitments and high-reliability validation.
Supply support for HF920GSE-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 monolithic HV integration and energy-efficient power conversion.
The HF920 product line targets high-reliability offline AC/DC conversion in utility-grade and industrial equipment, emphasizing ultra-low standby power, integrated protection, and immunity to real-world grid disturbances.
FAQ
What is the maximum continuous output power achievable with HF920GSE-P at 230Vac±15%?
The HF920GSE-P delivers up to 9.5W continuous output power under 230Vac±15% input conditions when mounted on a test board with 3cm² GND copper pour and operated at TA = 50°C. This rating assumes single-output configuration (12.5V/300mA), BCM operation at minimum input, and proper transformer turns ratio (N = 5) to limit VDS stress. Exceeding this power requires thermal derating per θJA = 96°C/W.
How does the frequency-doubling mode improve reliability in magnetic interference environments?
Frequency doubling activates when FB voltage reaches VOLP (3.65V), doubling the switching frequency to maintain regulation despite up to 50% reduction in transformer primary inductance caused by external magnetic fields. This prevents output collapse during interference events common near motors or transformers, ensuring uninterrupted operation in industrial settings without requiring shielded magnetics.
Can HF920GSE-P operate directly from 420Vac rectified input without external HV components?
Yes. The integrated 900V MOSFET and 900V-rated D pin allow direct connection to rectified 420Vac (≈594VDC peak) bus. Datasheet testing confirms safe operation up to 420Vac input with appropriate input capacitor stacking and snubber design. No external HV MOSFET, gate driver, or startup resistor is required - simplifying design for universal-input applications.
What is the role of the PRO pin, and how should it be implemented for input overvoltage protection?
The PRO pin provides external shutdown capability with 3.1V threshold and 0.2V hysteresis. For input OVP, connect a resistive divider from rectified DC bus to PRO, sized so PRO reaches 3.1V at desired trip voltage (e.g., 650VDC). Upon trigger, HF920GSE-P halts switching and auto-restarts once PRO falls below 2.9V after fault clearance - enabling field-recoverable protection without manual reset.
How does the internal soft-start function prevent inrush stress during cold start?
The internal soft-start ramps the peak-current comparator threshold over 6.7ms while progressively increasing switching frequency from 20% to 100% of programmed value. This limits primary-side inrush current and secondary diode reverse-recovery stress, preventing thermal overstress on transformer windings and output capacitors during initial power-up - critical for long-term reliability in unattended equipment.
Is HF920GSE-P compliant with RoHS and halogen-free standards?
Yes. HF920GSE-P is lead-free, halogen-free, and fully compliant with the EU RoHS Directive 2011/65/EU. MPS confirms green status via its Quality Assurance portal, and the device meets IPC/JEDEC J-STD-020 moisture sensitivity level (MSL) 3 requirements for surface-mount assembly.
What layout guidelines are essential for achieving the specified 9.5W output power?
To achieve rated 9.5W output, the SOIC8-7A package must be mounted with Pin 5–7 (GND) connected to a minimum 3cm² copper area using multiple thermal vias. Input capacitor stacking (two 450V-rated electrolytics with balancing resistors) is mandatory for 420Vac operation. Keep FSET and FB traces short and away from noise sources; place VCC decoupling capacitor within 5mm of Pin 1.
HF920GSE-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width), 7 Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Isolation:
- Isolated
- Internal Switch(s):
- Yes
- Voltage - Breakdown:
- 900V
- Topology:
- Flyback
- Voltage - Start Up:
- -
- Voltage - Supply (Vcc/Vdd):
- 10V ~ 24V
- Duty Cycle:
- 83%
- Frequency - Switching:
- 150kHz
- Power (Watts):
- -
- Fault Protection:
- Current Limiting, Over Load, Over Temperature, Over Voltage, Short Circuit, UVLO
- Control Features:
- Frequency Control, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC-7A
- Mounting Type:
- Surface Mount
HF920GSE-P FAQ
1.How can I place an order for HF920GSE-P through Aetrix?
Please submit a Request for Quotation (RFQ) for HF920GSE-P 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 HF920GSE-P reliable?
The price and inventory of HF920GSE-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HF920GSE-P is usually 5 days.
3.What payment methods are accepted for HF920GSE-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HF920GSE-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HF920GSE-P?
HF920GSE-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HF920GSE-P 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 HF920GSE-P?
For technical support, including HF920GSE-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HF920GSE-P requirements.
6.How does Aetrix verify that HF920GSE-P is sourced from the original manufacturer or authorized distributors?
All HF920GSE-P 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 HF920GSE-P meets industry standards.
7.What is the process for return or replacement of HF920GSE-P?
All HF920GSE-P units undergo pre-shipment inspection (PSI). If there is an issue with HF920GSE-P, 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 HF920GSE-P part is unused and in its original packaging.
Return procedure for HF920GSE-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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