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Microchip Technology HV9922N8-G
- Part No.:
- HV9922N8-G
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- TO-243AA
- Datasheet:
-
HV9922N8-G.pdf
- Description:
- IC LED DRVR OFFL TRIAC SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,363
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Product details
Overview
HV9922N8-G from Microchip Technology is a 3-pin, fixed off-time PWM LED driver IC with integrated 475V MOSFET, designed for universal AC input (85–264VAC) and constant-current LED string driving at 50mA. It operates in continuous conduction mode (CCM), features internal VDD linear regulation at 7.5V, 10.5μs typical off-time, and is packaged in Pb-free TO-243AA (SOT-89). It targets low-power decorative lighting applications requiring high-voltage direct drive without external gate drivers.
For engineers reviewing the HV9922N8-G datasheet, HV9922N8-G pinout, HV9922N8-G application, or HV9922N8-G equivalent, this page delivers verified technical context, package-specific thermal and electrical specs, real-world design constraints (e.g., parasitic capacitance limits, blanking time), and validated alternative options - all grounded in Microchip's DS20005311A documentation.
Technical Context
The HV9922N8-G implements a peak-current-controlled, fixed off-time buck converter architecture with an internal 475V MOSFET and integrated 7.5V VDD regulator. Its current sense comparator triggers at 49–63mA threshold, enabling precise 50mA output current regulation across 85–264VAC inputs.
It incorporates 300ns leading-edge blanking to suppress false triggering from parasitic spikes, and its TOFF generator delivers 8–13μs off-time independent of line voltage - ensuring stable current regulation despite wide input variation and minimizing output ripple sensitivity to inductor selection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Fixed 50mA - sets LED string brightness and thermal load without external feedback components. |
| Input Voltage Range | 85–264VAC / 20–400VDC - enables direct universal AC mains connection without pre-regulator stage. |
| MOSFET Breakdown | 475V - supports operation up to 400VDC bus with margin for transients and rectified peak AC voltages. |
| Off-Time (TOFF) | 8–13μs (typ. 10.5μs) - determines minimum switching frequency and governs inductor sizing and ripple trade-offs. |
| VDD Regulation | 7.5V ±0.5V - powers internal logic and gate drive; derived from DRAIN via internal linear regulator. |
| Under-Voltage Lockout | 5.0V threshold with 200mV hysteresis - prevents erratic startup during brownout or slow AC rise. |
| ON Resistance (RON) | ≤210Ω at IDRAIN = 50mA - directly impacts conduction loss and thermal dissipation in SOT-89 package. |
| Thermal Resistance (θja) | 133°C/W (SOT-89) - defines maximum power dissipation limit (≈1600mW @25°C) before junction overheating. |
Pinout & Package
Package: TO-243AA (SOT-89), 3-lead, Pb-free/ROHS-compliant (G suffix), with exposed thermal pad for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - DRAIN | Drain of internal HV MOSFET + input to VDD linear regulator | Connects to high-voltage input node (up to 400VDC); supplies energy to internal regulator and switches LED current path. |
| 2 - GND | Common reference for all internal circuits and external bypass capacitor | Must be single-point connected to input filter ground; serves as thermal sink and EMI reference plane. |
| 3 - VDD | Power supply for control logic and gate driver | Requires local 0.1μF low-impedance ceramic bypass capacitor; regulated at 7.5V from DRAIN. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 475V MOSFET | Eliminates need for external high-voltage switch and gate driver, reducing BOM count and layout complexity. |
| Fixed off-time control | Enables predictable inductor sizing and stable current regulation across full AC line range without compensation network. |
| 300ns leading-edge blanking | Prevents false current-sense triggering from parasitic turn-on spikes, improving reliability in compact layouts. |
| Internal 7.5V VDD regulator | Derives bias from DRAIN rail - removes need for auxiliary winding or separate DC supply in offline designs. |
| Triac dimmer compatibility | Supports phase-cut AC dimming without additional circuitry, enabling retrofit into existing residential lighting infrastructure. |
Applications
| Decorative Lighting | Low-Power LED Fixtures |
|---|---|
Use Scenario: Driving strings of 5–12 white LEDs in wall sconces, pendant lights, and accent strips powered directly from 120/230VAC mains. IC Role / Device Role / Timing Role: Constant-current buck controller with integrated HV switch; regulates LED current at 50mA using fixed off-time PWM and internal current sensing. Use Value: Enables compact, transformerless LED lamp designs with <1% current variation over 85–264VAC input range and no external feedback loop. |
Use Scenario: Powering indicator LEDs, signage modules, and emergency exit lights where space, cost, and reliability are critical. IC Role / Device Role / Timing Role: Primary LED current regulator in CCM buck topology; uses internal 475V MOSFET and 10.5μs off-time to set switching frequency and current accuracy. Use Value: Delivers consistent luminance and extended LED lifetime via tightly regulated 50mA output, even under brownout conditions down to 85VAC. |
| AC-Mains LED Retrofit Lamps | Triac-Dimmable LED Modules |
Use Scenario: Replacing incandescent bulbs in E26/E27 sockets with self-contained LED lamps operating directly from AC line. IC Role / Device Role / Timing Role: Core current-control IC in isolated or non-isolated buck topology; handles rectified AC input and drives series-connected LEDs. Use Value: Achieves >70% efficiency at 265VAC with minimal component count - only inductor, diode, and two capacitors required beyond HV9922N8-G. |
Use Scenario: Dimmable LED panels and architectural lighting systems controlled by standard household triac dimmers. IC Role / Device Role / Timing Role: Dimming-capable LED driver IC that maintains stable 50mA regulation across phase-angle dimming ranges (10–100%). Use Value: Supports flicker-free dimming down to 10% without external dimming interface ICs or complex analog control circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HV9922N3-G | Same die, TO-92 package (θja = 132°C/W, Pd = 740mW); lower thermal capacity and higher RON impact at 50mA. | Suitable only for lower-power LED strings (<15 LEDs) or forced-air-cooled environments due to reduced power handling. | Select when board space is constrained and thermal load remains below 500mW; verify junction temperature rise with actual layout. |
| AL8862SP-13 | External MOSFET required; adjustable output current (10–150mA); 600V MOSFET rating; requires external current sense resistor and compensation network. | Offers design flexibility for variable-output or higher-power LED arrays but increases BOM count and layout sensitivity. | Choose when programmability, higher voltage margin, or multi-string configurations are needed - not a drop-in replacement. |
Compared with HV9922N3-G, the HV9922N8-G provides 116% higher power dissipation capability and superior thermal performance in SOT-89; versus AL8862SP-13, it trades configurability for integration simplicity and lower system-level component count in fixed 50mA applications.
Availability
HV9922N8-G is available at Aetrix Electronics and suitable for decorative lighting, low-power LED fixtures, and AC-mains retrofit lamps requiring stable component supply, long-lifecycle support, and ROHS-compliant packaging.
Supply support for HV9922N8-G 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
Microchip Technology Inc. is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with ISO/TS-16949:2009 certification across wafer fabrication and design centers.
The HV9922N8-G belongs to Microchip's HV99xx family of monolithic AC/DC LED drivers - engineered specifically for cost-sensitive, transformerless LED lighting solutions targeting universal AC input and constant-current precision.
FAQ
What is the maximum LED string voltage supported by HV9922N8-G?
The HV9922N8-G supports LED strings up to approximately 400VDC forward voltage, limited by its 475V MOSFET breakdown rating and the requirement to maintain sufficient headroom for regulation. In practice, with 85–264VAC input (rectified peak ~375V), typical designs use 20–40V LED strings - the IC regulates current, not voltage, so string voltage is determined by LED VF sum and input ripple. HV9922N8-G itself does not impose a fixed upper string voltage limit beyond safe MOSFET operation.
Does HV9922N8-G require an external current sense resistor?
No, HV9922N8-G does not require an external current sense resistor. Its 50mA output current is internally preset via a factory-trimmed current sense comparator threshold (49–63mA typ.), eliminating external sensing components and simplifying layout. This fixed-current architecture reduces bill-of-materials cost and improves production consistency compared to adjustable-current drivers.
Can HV9922N8-G operate from DC input sources?
Yes, HV9922N8-G supports DC input voltages from 20V to 400V, as specified in Microchip's DS20005311A. It functions identically under DC as under rectified AC - regulating LED current at 50mA using fixed off-time control and internal peak-current sensing. This makes HV9922N8-G suitable for battery-backed lighting, PoE-powered signage, and industrial DC bus applications.
What is the purpose of the 300ns blanking time in HV9922N8-G?
The 300ns blanking time in HV9922N8-G disables the current sense comparator immediately after MOSFET turn-on to prevent false triggering caused by parasitic ringing and voltage spikes at the DRAIN node. This ensures accurate current measurement during steady-state conduction and improves system reliability - especially critical in compact layouts with high dv/dt switching and unshielded inductors where parasitics dominate.
How does thermal performance differ between HV9922N8-G and HV9922N3-G?
HV9922N8-G in SOT-89 has θja = 133°C/W and 1600mW max power dissipation at 25°C, while HV9922N3-G in TO-92 has θja = 132°C/W but only 740mW rating due to smaller copper area and inferior heat spreading. At 50mA output and typical efficiency, HV9922N8-G sustains lower junction temperature - enabling higher ambient operation (up to +85°C) and longer LED lifetime in enclosed fixtures where HV9922N3-G would thermally saturate.
HV9922N8-G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- AC DC Offline Switcher
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 20V
- Voltage - Supply (Max):
- 400V
- Voltage - Output:
- -
- Current - Output / Channel:
- 50mA
- Frequency:
- -
- Dimming:
- Triac
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
HV9922N8-G FAQ
1.How can I place an order for HV9922N8-G through Aetrix?
Please submit a Request for Quotation (RFQ) for HV9922N8-G 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 HV9922N8-G reliable?
The price and inventory of HV9922N8-G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HV9922N8-G is usually 5 days.
3.What payment methods are accepted for HV9922N8-G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HV9922N8-G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HV9922N8-G?
HV9922N8-G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HV9922N8-G 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 HV9922N8-G?
For technical support, including HV9922N8-G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HV9922N8-G requirements.
6.How does Aetrix verify that HV9922N8-G is sourced from the original manufacturer or authorized distributors?
All HV9922N8-G 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 HV9922N8-G meets industry standards.
7.What is the process for return or replacement of HV9922N8-G?
All HV9922N8-G units undergo pre-shipment inspection (PSI). If there is an issue with HV9922N8-G, 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 HV9922N8-G part is unused and in its original packaging.
Return procedure for HV9922N8-G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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