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Monolithic Power Systems Inc. HF920AGSE-Z
- Part No.:
- HF920AGSE-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- AC DC Converters, Offline Switches
- Package:
- 8-SOIC (0.154", 3.90mm Width), 7 Leads
- Datasheet:
-
HF920AGSE-Z.pdf
- Description:
- 900V FIXED FREQUENCY OFF-LINE RE
- Quantity:
- Payment:
- Shipping:
Inventory:4,322
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Product details
Overview
HF920AGSE-Z from Monolithic Power Systems is a 900V monolithic flyback switching regulator IC integrating a high-voltage MOSFET, peak-current-mode control, programmable fixed-frequency operation (up to 150kHz), and active burst mode for <30mW no-load consumption. It delivers up to 9.5W at 230Vac±15% in SOIC8-7A package and targets AC/DC power supplies in smart meters, industrial controls, and large appliances operating on poor or wide-range AC grids.
For engineers reviewing the HF920AGSE-Z datasheet, HF920AGSE-Z pinout, HF920AGSE-Z application, or HF920AGSE-Z equivalent, key selection criteria include its integrated 900V/15Ω MOSFET, VCC UVLO hysteresis (4V), PRO-pin programmable UVP/OVP thresholds, thermal shutdown at 150°C with 30°C recovery hysteresis, and frequency jittering (±3.5%) for PLC-friendly EMI reduction.
Technical Context
The HF920AGSE-Z implements peak-current-mode control with internal slope compensation and leading-edge blanking (tLEB1 = 385ns, tLEB2 = 350ns) to ensure stable CCM/BCM operation across universal input (85–420Vac). Its feedback loop uses FB pin voltage division (Kdiv = 3.4–3.7) to set primary peak current limit (VCSL = 0.91–1.02V), while burst mode activates below VBURL = 0.4–0.6V and exits above VBURH = 0.6–0.8V.
Protection is implemented via dedicated pins and internal logic: VCC OVP triggers at 23.9–26.5V with 70μs delay; PRO pin enables external UVP (0.21–0.28V) and OVP (2.92–3.32V); time-based OLP trips after 8192 cycles at VOLP = 3.3–4.0V; SCP responds to S-pin voltage >1.43–1.57V; OTP latches off at 150°C with 30°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Integrated MOSFET | 900V breakdown voltage, 15Ω RDS(ON) at 25°C - enables direct connection to 420Vac rectified bus without external HV FET. |
| Switching Frequency | Programmable up to 150kHz via FSET resistor - allows EMI tuning to avoid PLC bands (e.g., CENELEC A/B/C/D) and reduce filter cost. |
| No-Load Consumption | <30mW - achieved via active burst mode and optimized quiescent current (IQ = 200–300μA), meeting IEC 62301 standby requirements. |
| VCC UVLO Thresholds | VCCH = 12–14V turn-on, VCCL = 8.2–9.4V turn-off, hysteresis = 3–5V - ensures reliable start-up and brownout recovery on unstable AC lines. |
| PRO Pin Protection Range | UVP threshold: 0.21–0.28V; OVP threshold: 2.92–3.32V - supports configurable input under-voltage lockout and over-voltage shutdown for grid resilience. |
| Thermal Shutdown | 150°C activation with 30°C hysteresis - precise on-die OTP using same silicon as 900V MOSFET, eliminating external thermal sensors. |
| EMI Reduction | Frequency jittering ±3.5% over 256-cycle carrier - spreads spectral energy, reducing peak radiated emissions and simplifying EMI filter design. |
Pinout & Package
HF920AGSE-Z is housed in an SOIC8-7A package (7-pin variant of standard SOIC-8, with pin 7 omitted and GND assigned to pins 5 and 6). The exposed pad is not electrically connected; thermal performance relies on PCB copper area (3cm² GND copper recommended).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | IC power supply input - requires bulk + ceramic decoupling; powers internal circuitry after start-up; UVLO and OVP monitored here. |
| 2 | FSET | Frequency setting input - resistor-to-GND sets oscillator frequency; internal 1.25V reference enables precise kHz-level programming. |
| 3 | PRO | External protection input - dual-threshold comparator detects over/under-voltage faults on auxiliary or input rails for system-level safety. |
| 4 | FB | Feedback input - regulates output via optocoupler; also governs burst mode entry/exit and OLP timing through voltage thresholds. |
| 5,6 | GND | Signal and power ground - low-impedance return path for control logic and current sensing; must connect to ≥3cm² copper pour. |
| 7 | S | MOSFET source terminal - primary-side current sense node; feeds peak-current comparator and SCP detection circuitry. |
| 8 | D | MOSFET drain terminal - high-voltage input (up to 900V); hosts internal start-up current source (ICHARGE = 1–3mA at 400V). |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic 900V Power Integration | Eliminates external HV MOSFET and gate driver, reducing BOM count and layout complexity for offline flyback designs. |
| Active Burst Mode Control | Reduces standby power to <30mW by dynamically gating switching pulses based on FB voltage, without compromising transient response. |
| Programmable Frequency + Jittering | Enables EMI compliance in PLC-sensitive environments (e.g., home/building automation) with single-resistor tuning and ±3.5% spectral spreading. |
| On-Die Thermal Protection | OTP sensor co-located with 900V MOSFET die ensures accurate junction temperature monitoring and eliminates calibration drift. |
| Multi-Layer Protection Suite | Includes VCC UVLO/OVP, PRO-pin UVP/OVP, time-based OLP, SCP, and OTP - all auto-recovering except OTP latch-off until cooldown. |
Applications
| Smart Electricity Meters | Industrial Programmable Logic Controllers |
|---|---|
|
Use Scenario: Power supply for metrology and communication modules in DIN-rail mounted e-meters operating on unregulated 85–420Vac grids. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated 12.5V/300mA output; provides burst-mode standby for AMI RF modules. Use Value: Integrated 900V MOSFET withstands lightning surges and brownouts; PRO pin configures input UVP to prevent meter reset during grid dips. |
Use Scenario: Auxiliary power for I/O modules and microcontrollers in factory-floor PLCs exposed to voltage transients and harmonic distortion. IC Role / Device Role / Timing Role: Offline regulator delivering 13.5V/300mA with fast transient response via peak-current-mode control and soft-start. Use Value: VCC UVLO hysteresis (4V) prevents nuisance shutdowns; frequency jittering minimizes conducted noise coupling into analog sensor inputs. |
| Large Home Appliances | Building Automation Gateways |
|
Use Scenario: Main power supply for induction cooktops and HVAC controllers requiring high reliability across 100–240Vac global mains. IC Role / Device Role / Timing Role: Fixed-frequency flyback controller with active burst mode enabling Energy Star Tier 2 standby compliance. Use Value: <30mW no-load consumption meets strict efficiency mandates; SOIC8-7A package fits compact appliance PCB layouts. |
Use Scenario: Power conversion for KNX/EIB or BACnet gateways that integrate PLC modems and must coexist with narrowband power-line signals. IC Role / Device Role / Timing Role: EMI-optimized regulator with programmable frequency avoiding CENELEC A-band (3–95kHz) interference. Use Value: ±3.5% frequency jittering reduces peak radiated emissions by >10dB, easing EN 55022 Class B certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar offline flyback regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP174GZ | 700V integrated MOSFET, lower RDS(ON) (8Ω), no PRO pin, fixed 65kHz frequency. | Lacks programmable UVP/OVP and frequency tuning - suitable only for stable-input, non-PLC applications. | Select when input voltage is tightly regulated (e.g., 230Vac ±5%) and EMI constraints are less stringent. |
| UCC28881DR | 700V MOSFET, no frequency jittering, higher no-load consumption (~65mW), external slope compensation required. | Requires additional components for stable CCM; lacks integrated PRO protection and burst-mode optimization. | Choose only if TI ecosystem compatibility or specific TI reference designs are mandatory. |
Compared with MP174GZ and UCC28881DR, HF920AGSE-Z uniquely combines 900V rating, PRO-pin programmability, and ±3.5% jittering - making it the only option for high-surge, PLC-coexistence, and ultra-low-standby designs in smart infrastructure.
Availability
HF920AGSE-Z is available at Aetrix Electronics and suitable for smart metering, industrial control systems, and large-appliance power supplies requiring stable component supply across extended product lifecycles and global regulatory certifications.
Supply support for HF920AGSE-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 analog and power ICs, with core expertise in DC/DC converters, LED drivers, and motor drivers.
The HF920A product line is designed for high-reliability offline AC/DC conversion in harsh-grid environments, emphasizing integration, surge resilience, and ultra-low standby power for utility-grade equipment.
FAQ
What is the maximum continuous output power achievable with HF920AGSE-Z at 230Vac±15%?
The HF920AGSE-Z delivers up to 9.5W under 230Vac±15% input when mounted on a SOIC8-7A test board with 3cm² GND copper area and operated at TA = 50°C. This limit is thermally constrained by junction temperature; derating is required above 50°C ambient or with reduced copper area.
How does the PRO pin enable input under-voltage protection?
The PRO pin monitors external voltage dividers connected to AC input or DC bus. When voltage drops below 0.21–0.28V (UVP threshold), the IC shuts down and remains latched until VCC falls to VCCR (4.8–6.2V) and recovers. This prevents operation during brownouts that could damage downstream circuitry.
Can HF920AGSE-Z operate in discontinuous conduction mode (DCM)?
Yes - the HF920AGSE-Z supports DCM, boundary conduction mode (BCM), and continuous conduction mode (CCM) via its peak-current-mode architecture and built-in slope compensation. At light loads, it transitions into burst mode regardless of conduction mode.
What is the purpose of the two leading-edge blanking (LEB) timers?
The HF920AGSE-Z features two independent LEB timers: tLEB1 = 385ns blocks false current-limit triggering during MOSFET turn-on spikes; tLEB2 = 350ns specifically inhibits short-circuit detection during the same interval, preventing nuisance SCP activation.
Is external slope compensation required for stable operation?
No - the HF920AGSE-Z integrates slope compensation with a typical ramp rate of 21mV/μs (at RFSET = 200kΩ). This eliminates external components and ensures stable CCM operation even at duty cycles exceeding 50%, as verified in MPS application notes.
How does frequency jittering improve EMI performance?
Frequency jittering spreads the fundamental switching energy across a ±3.5% bandwidth centered on the programmed frequency. This reduces peak spectral amplitude by up to 10dB, relaxing requirements for Y-capacitors and common-mode chokes in the front-end EMI filter.
What happens during thermal shutdown, and how does recovery work?
When junction temperature exceeds 150°C, the HF920AGSE-Z latches off the MOSFET and discharges VCC to VCCR (4.8–6.2V). Recovery occurs only after VCC recharges to VCCH (12–14V) and junction temperature drops by ≥30°C - ensuring safe cooldown before restart.
HF920AGSE-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:
- -
- 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
HF920AGSE-Z FAQ
1.How can I place an order for HF920AGSE-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for HF920AGSE-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 HF920AGSE-Z reliable?
The price and inventory of HF920AGSE-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HF920AGSE-Z is usually 5 days.
3.What payment methods are accepted for HF920AGSE-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HF920AGSE-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HF920AGSE-Z?
HF920AGSE-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HF920AGSE-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 HF920AGSE-Z?
For technical support, including HF920AGSE-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HF920AGSE-Z requirements.
6.How does Aetrix verify that HF920AGSE-Z is sourced from the original manufacturer or authorized distributors?
All HF920AGSE-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 HF920AGSE-Z meets industry standards.
7.What is the process for return or replacement of HF920AGSE-Z?
All HF920AGSE-Z units undergo pre-shipment inspection (PSI). If there is an issue with HF920AGSE-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 HF920AGSE-Z part is unused and in its original packaging.
Return procedure for HF920AGSE-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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