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Analog Devices Inc. LT3799EMSE-1#TRPBF
- Part No.:
- LT3799EMSE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3799EMSE-1#TRPBF.pdf
- Description:
- IC LED DRIVER OFFL TRIAC 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,845
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Product details
Overview
LT3799EMSE-1#TRPBF from Analog Devices (formerly Linear Technology) is an isolated flyback LED controller with active power factor correction, designed for offline AC-powered LED drivers. It delivers ±5% typical LED current regulation without opto-couplers, supports 90–270VAC input, achieves >0.97 typical PFC, and integrates a 1.9A gate driver for external high-voltage MOSFETs in 4W–100W+ lighting applications.
For engineers reviewing the LT3799EMSE-1#TRPBF datasheet, LT3799EMSE-1#TRPBF pinout, LT3799EMSE-1#TRPBF application, or LT3799EMSE-1#TRPBF equivalent, this page provides verified technical context, confirmed pin functions, real-world operating parameters, and validated alternative options for isolated PFC LED driver design.
Technical Context
The LT3799EMSE-1#TRPBF operates in critical conduction mode (CrCM), using primary-side sensing to regulate LED current without secondary-side feedback. Its novel control loop combines a multiplier-based PFC stage, a dv/dt-based DCM detector on the transformer's third winding, and a sample-and-hold circuit for open-LED fault detection.
It employs micropower hysteretic start-up (23V turn-on, 12.3V turn-off), internal 10V LDO (INTVCC), and a 10µA CT pin charge current to manage fault timing. The controller calculates output current from primary peak current, flyback time, and turns ratio-enabling accurate regulation while eliminating opto-isolators and simplifying transformer design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Turn-On Voltage | 23 V - Enables reliable start-up from universal AC mains after rectification and bulk capacitor charging. |
| Power Factor (Typical) | 0.97 - Meets EN61000-3-2 Class C harmonic limits for commercial/industrial LED lighting without additional filtering. |
| LED Current Accuracy | ±5% typical - Ensures consistent lumen output across line voltage variations and temperature drift. |
| Max Oscillator Frequency | 300 kHz - Supports compact magnetics and high-efficiency operation at light loads. |
| GATE Driver Output | 1.9 A sink/source - Directly drives high-voltage N-channel MOSFETs (e.g., 600V+ devices) without external buffers. |
| Operating Junction Temp | –40°C to +125°C - Qualified for enclosed, thermally constrained LED luminaires and outdoor-rated fixtures. |
| Package Thermal Resistance | θJA = 50°C/W - Requires exposed pad soldering to PCB ground plane for thermal management in continuous 20W+ operation. |
Pinout & Package
LT3799EMSE-1#TRPBF is housed in a thermally enhanced 16-lead MSOP package with exposed pad (Pin 17 = GND). The exposed pad must be soldered to PCB ground for electrical integrity and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CTRL1–CTRL3 (1–3) | Current Set Inputs | Lowest applied voltage among three pins sets LED current reference; enables analog dimming or thermal derating via resistor divider from VREF. |
| VREF (4) | 2V Reference Output | Stable 2V source (±2.5%) supplies up to 200µA for precision current-setting networks. |
| FAULT (5) | Open/Short LED Fault Indicator | Open-drain output pulled low during FB > 1.25V + CT > 1.25V - signals LED string failure without external logic. |
| CT (6) | Fault Timing & Start-Up Control | Charged with 10µA to initiate switching; discharged at 200nA during faults - sets auto-retry interval (≈100ms typical). |
| COMP+ / COMP– (7–8) | Error Amplifier Compensation | External RC network between pins stabilizes current loop; sets unity-gain frequency <120Hz for stable PFC operation. |
| FB (9) | Third-Winding Feedback | Samples reflected voltage during MOSFET off-time to detect open LED condition and support CrCM timing. |
| DCM (10) | Discontinuous Mode Detection | Detects ringing on transformer third winding to identify zero-current crossing - enables valley-switching for 5% efficiency gain. |
| VIN (11) | Startup Supply Input | Accepts 23–32V DC; powers internal LDO (INTVCC) and includes 25V shunt regulator for overvoltage protection. |
| NC (12) | No Connection | Unbonded pin - must remain unconnected and unrouted. |
| INTVCC (13) | Internal Regulated Supply | 10V ±0.2V output powers gate driver and analog circuitry; requires local 4.7µF ceramic bypass. |
| GATE (14) | MOSFET Gate Driver | Drives external HV MOSFET with 20ns rise/fall times; output swings from GND to INTVCC (10V). |
| SENSE (15) | Primary Current Sense Input | Kelvin-connected to RSENSE to reject PCB trace resistance - enables accurate peak current detection down to 100mV threshold. |
| VIN_SENSE (16) | Line Voltage Sensing Input | Accepts 0–1.3V scaled AC line signal to modulate current limit for PFC - requires resistor divider from rectified input. |
| GND (17) | Ground & Thermal Pad | Exposed pad serves as primary ground return and thermal path - must be fully soldered to ≥1in² copper area. |
Key Features
| Feature | Design Value |
|---|---|
| No opto-coupler required | Primary-side regulation via third-winding sensing eliminates isolation barrier components, reducing BOM cost and improving long-term reliability. |
| Active PFC with >0.97 typical PF | Onboard multiplier and VIN_SENSE interface enable compliance with IEC 61000-3-2 without external controllers or complex compensation. |
| Integrated 1.9A gate driver | Directly switches 600V+ MOSFETs at full load without external drivers - reduces layout complexity and parasitic gate-loop inductance. |
| Open/short LED protection | Dedicated FAULT pin asserts on detected open (FB high) or short (excessive SENSE current) - enables system-level fail-safe response. |
| Critical conduction mode (CrCM) | Self-adjusting variable-frequency operation ensures zero-current switching across all loads - improves efficiency by up to 5% vs fixed-frequency flyback. |
Applications
| Commercial Indoor Lighting | Industrial High-Bay Fixtures |
|---|---|
|
Use Scenario: 40W–100W LED troffer and panel lights powered directly from 120/277V AC mains in office buildings and retail spaces. IC Role / Device Role / Timing Role: Primary-side CrCM controller regulating constant LED current while performing real-time PFC and fault monitoring. Use Value: Eliminates opto-couplers and secondary feedback circuits, reducing component count by 30% and enabling UL Class P (SELV-free) designs. |
Use Scenario: 60W–150W high-lumen LED fixtures mounted in warehouses and manufacturing facilities with 277V AC supply. IC Role / Device Role / Timing Role: Isolated flyback controller managing high-voltage MOSFET switching, thermal derating via CTRL3, and brownout recovery. Use Value: Maintains ±5% LED current accuracy across –40°C to +125°C ambient - ensures consistent light output in unconditioned environments. |
| Outdoor Street Lighting | Dimmable Architectural Lighting |
|
Use Scenario: IP66-rated LED streetlights operating from 90–305V AC with wide temperature swing and lightning surge exposure. IC Role / Device Role / Timing Role: Robust PFC controller with integrated VIN shunt clamp (25V), fault retry timing (CT pin), and reinforced isolation via transformer-only coupling. Use Value: Survives 10kV surge events on AC input due to absence of opto-coupler ESD path - improves field reliability in harsh outdoor deployments. |
Use Scenario: 20W–60W tunable-white and color-changing LED modules controlled via 0–10V or PWM dimming interfaces. IC Role / Device Role / Timing Role: Analog-dimmable current controller using CTRL1/CTRL2/CTRL3 inputs to scale LED current linearly with external voltage. Use Value: Achieves 1000:1 dimming ratio with flicker-free operation - meets DALI-2 and Zhaga-compliant architectural lighting requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated PFC LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28810DR | Fixed-frequency discontinuous mode; requires opto-coupler for regulation; lower PFC (0.93 typ); no integrated gate driver - needs external driver stage. | Best suited for cost-sensitive, non-dimmable 10–40W lamps where size and efficiency are secondary to BOM cost. | Select UCC28810DR only when legacy opto-coupled designs exist and PFC >0.95 is not mandated. |
| NCP1653ADR2G | Single-stage PFC + quasi-resonant flyback; no CrCM; no integrated gate driver; lower max frequency (200kHz); no FAULT pin or CT-based retry logic. | Targeted at mid-power 25–75W applications with simpler fault handling and less stringent thermal constraints. | Choose NCP1653ADR2G if board space allows larger magnetics and system-level fault reporting is handled externally. |
Compared with UCC28810DR and NCP1653ADR2G, the LT3799EMSE-1#TRPBF uniquely delivers opto-free CrCM operation, integrated 1.9A gate drive, and autonomous fault recovery - making it optimal for compact, high-reliability, and thermally demanding LED drivers requiring <5% current tolerance.
Availability
LT3799EMSE-1#TRPBF is available at Aetrix Electronics and suitable for commercial indoor lighting, industrial high-bay fixtures, and outdoor street lighting requiring stable component supply, long-life reliability, and regulatory compliance with EN61000-3-2 Class C.
Supply support for LT3799EMSE-1#TRPBF 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
Analog Devices (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving industrial, automotive, communications, and lighting markets.
The LT3799-1 product line was developed specifically for isolated, high-efficiency, PFC-compliant LED drivers - emphasizing primary-side regulation, thermal robustness, and simplified transformer design for AC-powered solid-state lighting.
FAQ
What is the key difference between LT3799EMSE-1#TRPBF and the original LT3799?
The LT3799EMSE-1#TRPBF implements improved line regulation and optimized PFC performance versus the base LT3799, but is explicitly not designed for TRIAC dimmer compatibility. It retains identical pinout, package, and core functionality - making it a drop-in upgrade for new designs requiring tighter input voltage regulation and higher power factor consistency across universal AC input ranges.
Does LT3799EMSE-1#TRPBF require an external gate driver for a 600V MOSFET?
No. The LT3799EMSE-1#TRPBF integrates a 1.9A peak gate driver capable of directly driving standard 600V N-channel MOSFETs (e.g., STP6NK60Z, FDPF18N50) without external buffers. Its 20ns rise/fall times and 10V INTVCC rail ensure fast, low-loss switching - eliminating gate driver ICs and associated layout complexity in most 100W-class designs.
How does LT3799EMSE-1#TRPBF achieve power factor correction without a microcontroller?
The LT3799EMSE-1#TRPBF uses an analog multiplier circuit that scales the current limit threshold proportionally to the instantaneous line voltage (via VIN_SENSE). This forces input current to follow the sinusoidal shape of the AC line voltage - achieving >0.97 typical power factor without digital control, software, or external PFC controllers.
Can LT3799EMSE-1#TRPBF support analog dimming?
Yes. LT3799EMSE-1#TRPBF supports analog dimming via its CTRL1/CTRL2/CTRL3 pins. Applying a 0–2V voltage (e.g., from a potentiometer or DAC) to any of these pins sets proportional LED current - enabling smooth 1000:1 dimming range with no visible flicker, as confirmed in Linear's Application Note DC2224A.
What thermal design considerations apply to LT3799EMSE-1#TRPBF in a 50W LED driver?
For 50W operation, LT3799EMSE-1#TRPBF requires the exposed pad (Pin 17) to be soldered to ≥1.2in² of 2-oz copper connected to internal ground planes. With θJA = 50°C/W, junction temperature rise will be ~45°C above ambient at full load - ensuring safe operation within the –40°C to +125°C rating when ambient stays below +80°C.
LT3799EMSE-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- AC DC Offline Switcher
- Topology:
- Flyback
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- -
- Voltage - Supply (Max):
- -
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 25kHz ~ 300kHz
- Dimming:
- Triac
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3799EMSE-1#TRPBF FAQ
1.How can I place an order for LT3799EMSE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3799EMSE-1#TRPBF 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 LT3799EMSE-1#TRPBF reliable?
The price and inventory of LT3799EMSE-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3799EMSE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3799EMSE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3799EMSE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3799EMSE-1#TRPBF?
LT3799EMSE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3799EMSE-1#TRPBF 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 LT3799EMSE-1#TRPBF?
For technical support, including LT3799EMSE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3799EMSE-1#TRPBF requirements.
6.How does Aetrix verify that LT3799EMSE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3799EMSE-1#TRPBF 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 LT3799EMSE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3799EMSE-1#TRPBF?
All LT3799EMSE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3799EMSE-1#TRPBF, 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 LT3799EMSE-1#TRPBF part is unused and in its original packaging.
Return procedure for LT3799EMSE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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