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Microchip Technology HV9861ALG-G
- Part No.:
- HV9861ALG-G
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
HV9861ALG-G.pdf
- Description:
- IC LED DRIVER CTRLR PWM 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:20,444
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Product details
Overview
HV9861ALG-G from Microchip Technology is an average-mode constant-current LED driver IC operating in constant off-time mode, designed for high-voltage DC/DC and AC/DC LED lighting applications. It delivers ±3% LED current accuracy, supports 15–450V input voltage range, features programmable off-time via RT pin, and integrates PWM/linear dimming inputs with hiccup-mode short-circuit protection.
For engineers reviewing the HV9861ALG-G datasheet, HV9861ALG-G pinout, HV9861ALG-G application, or HV9861ALG-G equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions for SOIC-8 layout, confirmed alternative options for LED driver redesigns, and supply-chain support for industrial lighting BOMs.
Technical Context
The HV9861ALG-G implements a patented average-current control architecture that eliminates peak-to-average error inherent in peak-current controllers like the HV9910B, enabling ±3% LED current accuracy without loop compensation or high-side sensing. Its open-loop fast response relies solely on switch-current sensing at the CS pin and internal 270mV reference (or LD-derived 0.18×VLD).
It operates exclusively in constant off-time mode - not constant frequency - with TOFF programmable from 8μs to 48μs via RT resistor (30kΩ–1MΩ). Internal 7.5V VDD regulator powers all circuitry; UVLO triggers at 6.45V with 500mV hysteresis, and over-temperature shutdown activates at 140°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 15–450V DC - enables direct off-line operation without pre-regulator; continuous use limited by package thermal dissipation (8-lead SOIC: ≤330V at TA=25°C). |
| LED Current Accuracy | ±3% - achieved via average-mode control eliminating peak-to-average error; no external compensation required. |
| VDD Regulation | 7.5V ±0.25V - internally regulated supply powering all logic and gate driver; bypass capacitor ≥0.1μF required at VDD. |
| TOFF Programmability | 8–48μs - set by RT resistor (226kΩ → 10μs; 1MΩ → 40μs); determines switching frequency and impacts inductor sizing. |
| Dimming Support | PWM + linear - TTL-compatible PWMD pin; LD pin accepts 0–1.5V analog signal to scale current sense threshold (0.18×VLD). |
| Short-Circuit Protection | Hiccup mode - triggers at CS ≥450mV; inserts 650μs off-time to prevent inductor saturation during output fault. |
| Operating Temperature | −40°C to +125°C - rated for under-hood automotive, outdoor signage, and industrial LED drivers. |
Pinout & Package
HV9861ALG-G is housed in an 8-lead SOIC (Small Outline Integrated Circuit) package with standard JEDEC MS-012 footprint (3.90mm × 4.90mm body, 1.27mm pitch), Pb-free and RoHS-compliant (G suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | High-voltage input rail | Accepts 15–450V DC; powers internal 7.5V regulator; must be decoupled externally if used as sole supply. |
| CS | Current sense input | Monitors MOSFET source current via external sense resistor; threshold = 270mV (or 0.18×VLD); includes 140–290ns blanking. |
| GND | Power and signal ground | Common return for internal circuits and power train; must connect directly to low-impedance ground plane. |
| GATE | External MOSFET driver output | Push-pull driver (0.165A sink/source); rise/fall time ≤50ns into 500pF; drives N-channel FET gate directly. |
| RT | Off-time timing resistor | Resistor to GND sets TOFF (8–48μs); unlike HV9910B, cannot be tied to GATE - strict GND connection required. |
| LD | Linear dimming control | Analog input (0–1.5V) scaling current threshold; <150mV disables GATE; >200mV re-enables; enables mixed-mode dimming. |
| VDD | Internal supply rail | 7.5V regulated output; powers IC and optional external circuitry; requires ≥0.1μF low-ESR bypass capacitor. |
| PWMD | PWM dimming enable | TTL-compatible input; low = GATE disabled; high = normal operation; fast open-loop response matches HV9910B. |
Key Features
| Feature | Design Value |
|---|---|
| Average-mode constant current control | Eliminates peak-to-average error → ±3% LED current accuracy across line/load without compensation network. |
| Programmable constant off-time | TOFF set by single RT resistor (30kΩ–1MΩ) → stable switching frequency independent of input/output variations. |
| Dual dimming interface | Independent PWMD (TTL) and LD (0–1.5V analog) inputs → supports hybrid dimming schemes with >1000:1 effective ratio. |
| Hiccup-mode short-circuit protection | CS >450mV triggers 650μs forced off-time → prevents inductor saturation and thermal runaway during LED string fault. |
| Wide input voltage capability | 15–450V DC operation → enables direct integration into offline AC/DC LED drivers without auxiliary supply. |
Applications
| Architectural LED Lighting | LED Street Lighting |
|---|---|
Use Scenario: Outdoor luminaires requiring long-life, high-efficiency constant-current drive under wide ambient temperature swings (−40°C to +85°C). IC Role / Device Role / Timing Role: Primary LED current controller in buck topology; regulates average inductor current using CS feedback and constant off-time timing. Use Value: ±3% current accuracy ensures consistent lumen output across varying input voltage (e.g., 277VAC rectified) and temperature - critical for municipal lighting compliance. | Use Scenario: High-reliability, high-voltage LED drivers for pole-mounted streetlights powered from 277VAC or 347VAC mains. IC Role / Device Role / Timing Role: Off-line LED driver controller interfacing directly to rectified high-voltage bus; manages GATE timing, current regulation, and fault recovery. Use Value: 450V VIN rating and −40°C to +125°C operation allow single-stage design without pre-regulator - reducing component count and improving MTBF. |
| LED Backlight for LCD Displays | LED Signage and Displays |
Use Scenario: Thin, energy-efficient backlight units for commercial displays where dimming fidelity and EMI control are critical. IC Role / Device Role / Timing Role: Constant-current source driving parallel LED strings; uses PWM dimming (PWMD) for flicker-free brightness control. Use Value: Fast open-loop PWM response (<4 cycles to steady state) enables high-frequency dimming (>1kHz) without visible artifacts or audible noise. | Use Scenario: Indoor/outdoor channel letters, message boards, and decorative lighting with variable brightness and color mixing requirements. IC Role / Device Role / Timing Role: Core current regulator in multi-string LED arrays; leverages LD pin for smooth 0–100% analog dimming and PWMD for strobing effects. Use Value: Dual-dimming support allows seamless transition between ambient light adaptation (LD) and dynamic content sequencing (PWMD) - no additional DAC or MCU needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HV9910B | Peak-current control; no average-mode accuracy; supports constant-frequency mode; requires external compensation. | Limited to lower-accuracy LED applications where ±10% current tolerance is acceptable; less suitable for high-end architectural lighting. | Choose HV9910B only when cost sensitivity outweighs accuracy needs and existing designs already use its constant-frequency option. |
| HV9961 | Same average-mode architecture as HV9861A but with integrated 600V MOSFET; no external GATE driver; fixed TOFF (no RT pin). | Targeted at lower-power, space-constrained applications (<15W); eliminates external FET but forfeits flexibility in MOSFET selection and thermal management. | Select HV9961 for compact, low-BOM-count designs where 600V/0.3A integrated FET suffices; retain HV9861ALG-G for higher-power or thermally demanding layouts. |
Compared with HV9910B, HV9861ALG-G improves LED current accuracy from ±10% to ±3% and removes compensation design effort; versus HV9961, it trades integrated FET convenience for external MOSFET scalability and thermal isolation - making HV9861ALG-G optimal for 20–100W industrial LED drivers.
Availability
HV9861ALG-G is available at Aetrix Electronics and suitable for architectural LED lighting, street lighting infrastructure, and LCD display backlighting requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.
Supply support for HV9861ALG-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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with ISO/TS-16949 certified manufacturing.
The HV9861A product line was developed specifically for high-voltage, high-accuracy LED current regulation in off-line lighting systems - emphasizing thermal robustness, dimming flexibility, and design simplicity.
FAQ
What is the maximum continuous input voltage supported by HV9861ALG-G in an 8-lead SOIC package?
HV9861ALG-G supports up to 450V DC absolute maximum, but continuous operation is thermally limited. With 8-lead SOIC (θJA = 101°C/W) at TA = 25°C and IIN ≈ 3.0mA, the practical continuous VIN limit is ~330V. Higher voltages require external power diversion (e.g., Zener clamp) to avoid exceeding TJ(MAX) = 125°C. The HV9861ALG-G datasheet specifies this derating explicitly in Section 3.4.
Does HV9861ALG-G require external loop compensation components?
No, HV9861ALG-G does not require external loop compensation. Its patented average-mode control operates in fast open-loop mode using only the CS pin current sense signal and internal timing - eliminating the need for compensation networks, op-amps, or external capacitors. This simplifies PCB layout and improves reliability compared to peak-current controllers like HV9910B. The HV9861ALG-G achieves ±3% LED current accuracy inherently.
How does the LD pin function in HV9861ALG-G, and what happens below 150mV?
The LD pin on HV9861ALG-G provides linear dimming control: when 0–1.5V is applied, the current sense threshold becomes 0.18×VLD (replacing the default 270mV). If VLD falls below 150mV, the GATE output is disabled; recovery occurs only when VLD exceeds 200mV. This hysteresis enables clean on/off control using the same analog signal - a feature confirmed in HV9861ALG-G's Electrical Characteristics table (VLD(OFF) and ΔVLD(OFF)).
Is HV9861ALG-G pin-compatible with HV9910B, and can it be used as a drop-in replacement?
Yes, HV9861ALG-G is pin-to-pin compatible with HV9910B in the 8-lead SOIC package (LG), and the datasheet explicitly states it can serve as a drop-in replacement to improve LED current accuracy and regulation. However, note that HV9861ALG-G uses RT-to-GND (not RT-to-GATE) and lacks constant-frequency mode - so existing HV9910B layouts must verify RT routing and confirm constant off-time operation meets system requirements before substitution.
What thermal considerations apply to HV9861ALG-G in high-power LED driver designs?
HV9861ALG-G has θJA = 101°C/W in 8-lead SOIC. At full 450V input and typical 3mA supply current, power dissipation in the IC itself reaches ~1.35W - risking junction temperatures beyond 125°C without heatsinking or airflow. For >30W LED loads, thermal relief (copper pour, thermal vias, or forced air) is essential. The HV9861ALG-G datasheet recommends limiting continuous VIN based on ambient temperature and power draw - detailed in Section 3.4 and Table 1-2.
HV9861ALG-G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 15V
- Voltage - Supply (Max):
- 450V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- Analog, PWM
- Applications:
- Backlight, Lighting, Signage
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
HV9861ALG-G FAQ
1.How can I place an order for HV9861ALG-G through Aetrix?
Please submit a Request for Quotation (RFQ) for HV9861ALG-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 HV9861ALG-G reliable?
The price and inventory of HV9861ALG-G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HV9861ALG-G is usually 5 days.
3.What payment methods are accepted for HV9861ALG-G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HV9861ALG-G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HV9861ALG-G?
HV9861ALG-G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HV9861ALG-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 HV9861ALG-G?
For technical support, including HV9861ALG-G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HV9861ALG-G requirements.
6.How does Aetrix verify that HV9861ALG-G is sourced from the original manufacturer or authorized distributors?
All HV9861ALG-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 HV9861ALG-G meets industry standards.
7.What is the process for return or replacement of HV9861ALG-G?
All HV9861ALG-G units undergo pre-shipment inspection (PSI). If there is an issue with HV9861ALG-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 HV9861ALG-G part is unused and in its original packaging.
Return procedure for HV9861ALG-G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HV9861ALG-G Tags
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