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Monolithic Power Systems Inc. HF920BGSE-Z
- Part No.:
- HF920BGSE-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- AC DC Converters, Offline Switches
- Package:
- 8-SOIC (0.154", 3.90mm Width), 7 Leads
- Datasheet:
-
HF920BGSE-Z.pdf
- Description:
- 900V, FIXED-FREQUENCY, EMI-OPTIM
- Quantity:
- Payment:
- Shipping:
Inventory:2,494
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Product details
Overview
HF920BGSE-Z from Monolithic Power Systems is a monolithic 900V flyback switching regulator IC with integrated MOSFET, programmable frequency up to 150kHz, EMI-optimized jittering and frequency doubling, and <30mW no-load consumption. It delivers stable AC/DC power conversion for smart meters, industrial controls, and large appliances operating across 85–420VAC input.
For engineers reviewing the HF920BGSE-Z datasheet, HF920BGSE-Z pinout, HF920BGSE-Z application, or HF920BGSE-Z equivalent, key selection criteria include its 900V/15Ω integrated MOSFET, burst-mode standby efficiency, VCC UVLO hysteresis (4V), PRO pin protection with auto-restart, and SOIC8-7A package thermal performance (θJA = 96°C/W).
Technical Context
The HF920BGSE-Z implements peak current mode control with internal slope compensation and leading-edge blanking (tLEB1 = 385ns) to ensure stable loop dynamics and noise immunity. Its proprietary 900V monolithic process integrates OTP on-die with the power MOSFET, enabling precise thermal shutdown at 150°C with 30°C hysteresis.
EMI mitigation is achieved via ±3.5% frequency jittering and optional frequency doubling-triggered when FB rises to VOLP (3.65V)-allowing operation under magnetizing interference that reduces transformer inductance by up to 50%. The FSET pin supports resistor-programmed frequency and dual-mode configuration using a 1nF capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Integrated MOSFET | 900V breakdown voltage, 15Ω RDS(ON) @ 25°C - enables direct connection to universal AC mains without external HV MOSFET. |
| Switching frequency | Programmable up to 150kHz via FSET resistor - allows radiated EMI tuning to avoid PLC bands in home automation. |
| No-load consumption | <30mW - meets stringent global energy standards (e.g., EU CoC Tier 2, DOE Level VI) for always-on metering systems. |
| Burst mode thresholds | VBURL = 0.5V, VBURH = 0.7V - defines precise light-load transition points to minimize switching loss while maintaining regulation. |
| VCC UVLO | VCCH = 13V, VCCL = 9V, hysteresis = 4V - ensures reliable start-up and brown-out recovery across wide temperature and line ranges. |
| OVP & OLP | VOVP = 25.5V, tOVP = 70μs; VOLP = 3.65V over 8192 cycles - provides layered fault protection with auto-restart behavior for field reliability. |
| Thermal protection | OTP threshold = 150°C, recovery hysteresis = 30°C - prevents permanent damage during sustained overload or poor heatsinking. |
Pinout & Package
HF920BGSE-Z is housed in a SOIC8-7A package (7-pin variant with exposed GND pad), optimized for high-voltage isolation and thermal dissipation. The package features an internal GND plane connected to a 3cm² copper area per datasheet layout guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Power ground reference | Primary return path for internal MOSFET source current and control circuitry; requires dedicated 3cm² copper pour for thermal management. |
| 2 (VCC) | IC supply rail | Powered initially by D-pin HV current source; transitions to auxiliary winding after VCCH (13V) is reached; UVLO hysteresis ensures clean restart. |
| 3 (FSET) | Frequency programming & mode control | Resistor-to-GND sets fSW; adding 1nF enables frequency doubling during OLP - critical for EMI robustness in noisy environments. |
| 4 (PRO) | External fault input | Pulled high (>3.1V) to initiate shutdown with hysteresis and auto-restart - used for input OVP, external OTP, or system-level fault signaling. |
| 5 (FB) | Feedback and protection sensing | Regulates output via optocoupler; also detects burst entry (0.5V), OLP (3.65V), and initiates soft-start ramp - single pin handles multiple control functions. |
| 6 (D) | Drain of integrated MOSFET | High-side switch node rated for 900V; connects to primary winding; supplies start-up current via internal HV source until VCC is established. |
| 7 (S) | Source and current sense | Current-sense input referenced to GND; monitors primary peak current with LEB (385ns); feeds slope-compensated comparator for cycle-by-cycle limiting. |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic 900V MOSFET | Eliminates external HV switch and gate driver, reducing BOM count and PCB footprint in space-constrained metering designs. |
| Active burst mode | Reduces switching loss at light load by gating PWM pulses - achieves <30mW no-load consumption without compromising regulation accuracy. |
| Frequency jittering (±3.5%) | Spreads spectral energy across 256-cycle window, lowering peak EMI by >10dB and relaxing input filter component requirements. |
| On-die over-temperature protection | Direct junction temperature sensing enables faster, more accurate thermal shutdown than external NTC-based solutions - improves long-term reliability. |
| Internal soft-start (6.7ms) | Gradually increases peak current limit and switching frequency to prevent inrush stress on transformer, rectifier, and output capacitors. |
Applications
| Smart Electricity Meters | Industrial PLC Power Supplies |
|---|---|
Use Scenario: Primary AC/DC converter powering metrology IC, RTC, and communication modules in Class 0.2 static meters operating continuously on 230VAC ±15%. IC Role / Device Role / Timing Role: Offline flyback controller managing isolated 12.5V/300mA main rail and auxiliary 8V rails; regulates via optocoupler feedback with burst mode active during sleep cycles. Use Value: <30mW no-load consumption extends battery backup life; 900V MOSFET withstands 420VAC surges per IEC 61000-4-5; EMI optimization avoids interference with PLC communication (CENELEC A band). | Use Scenario: Auxiliary power supply for DIN-rail mounted programmable logic controllers requiring stable 15V/500mA output across 85–420VAC industrial mains with high ESD/EMI immunity. IC Role / Device Role / Timing Role: Fixed-frequency flyback regulator with frequency doubling enabled - maintains regulation during magnetic interference from nearby contactors or variable-frequency drives. Use Value: Frequency doubling allows continued operation despite up to 50% transformer inductance drop; PRO pin interfaces with external overvoltage detector for redundant input protection. |
| Large Appliance Control Boards | Building Automation Gateways |
Use Scenario: Main power supply for washing machine control unit with variable load profiles (motor drive, display, sensors) and strict standby power limits (<0.5W). IC Role / Device Role / Timing Role: Primary offline regulator delivering 12V/1A and 5V/2A outputs; uses burst mode below 5% load and transitions to CCM above 15% load for optimal efficiency. Use Value: Programmable fSW allows tuning to avoid audible noise in 20–25kHz range; integrated OLP and SCP eliminate need for external fault latching circuits. | Use Scenario: Power conversion stage in KNX/EIB or BACnet gateway handling both 230VAC mains and PoE backup, requiring low EMI for co-location with wireless radios (Zigbee, BLE). IC Role / Device Role / Timing Role: EMI-optimized flyback controller with jittering and frequency doubling - suppresses narrowband emissions near 868MHz ISM band and prevents coupling into RF front-end. Use Value: ±3.5% jittering reduces peak conducted emissions by >8dBμV; SOIC8-7A package supports compact 2-layer PCB layout with minimal creepage/clearance violations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar offline flyback regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP6004GQ-Z | 700V integrated MOSFET, fixed 65kHz fSW, no frequency doubling or jittering, higher no-load consumption (~65mW) | Limited to ≤265VAC inputs; unsuitable for 420VAC surge-prone metering or industrial environments | Select only for cost-sensitive, lower-voltage consumer applications where EMI headroom exists. |
| UCC28632DR | 650V MOSFET, valley-switching quasi-resonant topology, no integrated HV start-up, requires external bias winding | Higher efficiency at medium loads but larger solution size; lacks monolithic HV integration and PRO pin flexibility | Prefer for high-efficiency lighting drivers where transformer design freedom outweighs BOM simplicity. |
Compared with MP6004GQ-Z and UCC28632DR, HF920BGSE-Z uniquely combines 900V integration, EMI-optimized jittering + frequency doubling, and sub-30mW standby - making it the only choice for high-reliability, high-input-voltage, low-EMI AC/DC conversion in utility-grade equipment.
Availability
HF920BGSE-Z is available at Aetrix Electronics and suitable for smart metering, industrial control power supplies, and large-appliance auxiliary power conversion requiring stable component supply across extended product lifecycles.
Supply support for HF920BGSE-Z 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 power management ICs, with over two decades of innovation in monolithic HV integration and EMI-aware design.
The HF920B product line targets high-reliability offline AC/DC conversion in utility, industrial, and white-goods applications - emphasizing ultra-low standby power, robust fault protection, and compliance with global EMI standards.
FAQ
What is the maximum continuous output power achievable with HF920BGSE-Z in SOIC8-7A package?
At 230VAC ±15%, the HF920BGSE-Z delivers up to 9.5W continuous output power in SOIC8-7A when mounted on a 3cm² copper area at TA = 50°C. This assumes single-output 12.5V design, BCM operation at minimum input, and proper transformer turns ratio (N = 5) to limit VDS stress. Derating applies above 50°C ambient.
How does the PRO pin function during fault conditions?
The PRO pin shuts down the IC when pulled above 3.1V with 0.2V hysteresis, then automatically restarts once the voltage drops below 2.9V. It supports external fault detection such as input overvoltage or thermistor-based overtemperature monitoring, and includes auto-recovery behavior - eliminating need for external latch circuits in most industrial designs.
Can HF920BGSE-Z operate without an auxiliary winding for VCC supply?
Yes - the internal HV current source on the D pin powers VCC during startup until VCCH (13V) is reached. Once established, the auxiliary winding takes over. If the auxiliary winding fails, the IC reverts to D-pin supply, enabling fail-safe operation in critical metering applications where auxiliary loss must not cause total power failure.
What is the purpose of the 1nF capacitor on the FSET pin?
A 1nF capacitor placed between FSET and GND enables frequency doubling mode. When FB rises to the OLP threshold (3.65V), the switching frequency doubles - allowing the converter to maintain regulation despite up to 50% reduction in transformer inductance caused by external magnetic fields, a common issue in industrial motor control environments.
How does the HF920BGSE-Z achieve <30mW no-load consumption?
It combines active burst mode (disabling switching when FB falls below 0.5V), ultra-low quiescent current (300μA), and efficient HV start-up current source (2mA typical). During burst, the IC enters deep sleep between pulse trains, minimizing both switching and bias losses - validated at 230VAC with all secondary outputs open.
Is the SOIC8-7A package lead-free and RoHS-compliant?
Yes - HF920BGSE-Z is fully lead-free, halogen-free, and compliant with the EU RoHS Directive 2011/65/EU. MPS confirms green status per its Quality Assurance documentation, and the device meets JEDEC J-STD-020 moisture sensitivity level (MSL) 2 requirements for surface-mount assembly.
HF920BGSE-Z 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:
- 4 V
- Voltage - Supply (Vcc/Vdd):
- 10V ~ 24V
- Duty Cycle:
- 83%
- Frequency - Switching:
- Up to 150kHz
- Power (Watts):
- 9.5 W
- Fault Protection:
- Current Limiting, Over Load, Over Temperature, Short Circuit
- Control Features:
- Frequency Control
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC-7A
- Mounting Type:
- Surface Mount
HF920BGSE-Z FAQ
1.How can I place an order for HF920BGSE-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for HF920BGSE-Z 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 HF920BGSE-Z reliable?
The price and inventory of HF920BGSE-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HF920BGSE-Z is usually 5 days.
3.What payment methods are accepted for HF920BGSE-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HF920BGSE-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HF920BGSE-Z?
HF920BGSE-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HF920BGSE-Z 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 HF920BGSE-Z?
For technical support, including HF920BGSE-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HF920BGSE-Z requirements.
6.How does Aetrix verify that HF920BGSE-Z is sourced from the original manufacturer or authorized distributors?
All HF920BGSE-Z 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 HF920BGSE-Z meets industry standards.
7.What is the process for return or replacement of HF920BGSE-Z?
All HF920BGSE-Z units undergo pre-shipment inspection (PSI). If there is an issue with HF920BGSE-Z, 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 HF920BGSE-Z part is unused and in its original packaging.
Return procedure for HF920BGSE-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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