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Texas Instruments UCC28811DR
- Part No.:
- UCC28811DR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UCC28811DR.pdf
- Description:
- IC LED DRIVER OFFL TRIAC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,200
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Product details
Overview
UCC28811DR from Texas Instruments is a transition-mode AC-DC LED lighting power controller for single-stage PFC flyback, buck, or boost converters. It delivers 750-mA peak gate drive, features 12.5-V UVLO turn-on threshold, 300-µA gM amplifier source current, and integrated zero-energy detection for valley switching-enabling triac-dimmable LED drivers in street lighting and outdoor luminaires.
For engineers reviewing the UCC28811DR datasheet, UCC28811DR pinout, UCC28811DR application, or UCC28811DR equivalent, this device supports critical conduction mode (CrM) operation with slew-rate enhanced error amplification, OVP/enable protection, and transformer zero-energy sensing-key for stable, low-THD, EMC-compliant LED driver designs requiring two-stage power conversion control.
Technical Context
The UCC28811DR operates in critical conduction mode using self-oscillating PWM: turn-on is triggered by the TZE pin detecting transformer zero-current via bias winding voltage crossing ~1.25 V (rising edge), while turn-off is governed by the ISENSE comparator threshold (~1.7 V). Its transconductance error amplifier (90 µS typical) drives the current reference generator with VINS and EAOUT inputs to enforce input-current shaping proportional to rectified line voltage.
Unlike the UCC28810DR, the UCC28811DR uses a lower 12.5-V UVLO turn-on threshold and reduced 300-µA gM amplifier source current-designed specifically to interface with downstream PWM controllers in two-stage architectures. Its zero-power detect circuit activates when EAOUT falls below 2.3 V, latching GDRV low under light-load conditions to prevent overvoltage without auxiliary regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| UVLO Turn-On Threshold | 12.5 V (enables controlled start-up in two-stage systems where upstream stage regulates VDD) |
| gM Amplifier Source Current | 300 µA (limits EAOUT slew rate during transients, preventing abrupt line-current steps) |
| Peak Gate Drive Current | ±750 mA (directly drives external MOSFETs without external buffer in medium-power LED drivers) |
| TZE Input Threshold | 1.25 V rising edge (detects transformer demagnetization for valley-switching, reducing COSS losses) |
| VREF Accuracy | 2.50 V ±50 mV (ensures tight output voltage regulation and precise OVP/enable thresholds) |
| ISENSE Threshold Voltage | 1.70 V max (sets peak switch current limit; includes 75-mV internal offset to improve zero-crossing THD) |
| Operating Temperature | –40°C to +105°C (supports industrial-grade outdoor and street lighting environments) |
Pinout & Package
UCC28811DR is housed in an 8-pin SOIC (D) package with exposed pad not electrically connected. Thermal impedance is 150°C/W junction-to-ambient under JEDEC JESD 51-3 PCB conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSENSE (Pin 1) | Inverting input to gM amplifier & OVP/enable comparator | Senses regulated output voltage via divider; pulls low to disable converter on feedback fault or external command |
| EAOUT (Pin 2) | Transconductance amplifier output | Drives current reference generator; dynamic range 2.5–4.0 V; sinks 1 mA during overvoltage to suppress output rise |
| VINS (Pin 3) | Input voltage sense for current reference generator | Accepts 0–3.5 V from line-voltage divider; enables input-current shaping for PFC compliance |
| ISENSE (Pin 4) | Current-sense comparator input | Detects primary switch current; includes 75-mV internal offset and clamp at 1.7 V to terminate switching cycle |
| TZE (Pin 5) | Transformer zero-energy detector input | Monitors bias winding to trigger valley switching; active clamps limit voltage to 0.3–6 V; restart timer activates after 400 µs no-detect |
| GND (Pin 6) | Power and signal reference ground | Must be tied directly to bypass capacitor with shortest possible trace to minimize noise coupling into sensitive analog nodes |
| GDRV (Pin 7) | High-current gate driver output | Delivers ±750 mA peak; rise/fall times <75 ns/50 ns with 1-nF load; held low below UVLO threshold |
| VDD (Pin 8) | Supply input with internal clamp | Internally clamped to 20 V; requires ≥0.1-µF high-frequency bypass to GND; UVLO hysteresis = 2.8 V |
Key Features
| Feature | Design Value |
|---|---|
| Triac dimming compatibility | Integrated zero-power detect and slew-rate enhanced error amplifier enable stable phase-cut dimming without flicker or drop-out |
| Critical conduction mode control | Self-oscillating CrM architecture eliminates need for external timing components and reduces EMI through valley switching |
| Two-stage system interoperability | 12.5-V UVLO and 300-µA gM source current allow seamless coordination with downstream PWM controllers in multi-stage LED drivers |
| Robust protection suite | OVP, open-feedback protection, enable/disable function, and restart timer provide fault containment without external supervision |
| Low-light efficiency optimization | Zero-power comparator deactivates switching when EAOUT drops below 2.3 V, eliminating no-load overvoltage and standby power waste |
Applications
| Street Lighting Driver | Commercial Outdoor Luminaire |
|---|---|
Use Scenario: 100-W triac-dimmable LED fixture powered from 100–277 VAC mains with IP66 enclosure. IC Role / Device Role / Timing Role: Primary CrM controller managing PFC flyback stage; synchronizes switching to transformer zero-energy point for valley turn-on. Use Value: Enables >0.9 PF and <15% THD while supporting legacy wall dimmers-critical for municipal infrastructure compliance. |
Use Scenario: 50-W parking lot light with thermal derating and surge immunity requirements per IEC 61000-4-5. IC Role / Device Role / Timing Role: Two-stage interface controller: accepts regulated bus from upstream DC-DC stage and regulates LED current via buck topology. Use Value: 12.5-V UVLO allows precise enable/disable sequencing with upstream controller, improving system-level reliability and inrush management. |
| Industrial Area Lighting | Architectural Ornamental Fixture |
Use Scenario: High-bay warehouse light operating continuously at –25°C to +60°C ambient with 15-kV ESD protection. IC Role / Device Role / Timing Role: Single-stage PFC boost controller driving constant-current LED string; uses VINS-based current shaping for line regulation. Use Value: Integrated OVP and open-feedback protection prevent catastrophic failure during LED string open-circuit events in unattended installations. |
Use Scenario: Low-profile façade lighting with strict EMI limits and dimming smoothness requirements. IC Role / Device Role / Timing Role: Flyback controller with slew-rate enhanced EAOUT to maintain regulation during rapid dimmer transitions. Use Value: 300-µA gM source current prevents overshoot during dimmer ramp-up, eliminating visible light artifacts in high-end architectural applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED lighting controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28810DR | 15.8-V UVLO turn-on threshold; 1.3-mA gM source current | Optimized for single-stage retrofit luminaires without downstream PWM control | Select UCC28810DR when faster start-up with smaller VDD capacitance and improved transient response are required |
| NCP1653ADR2G | Fixed-frequency CCM/PFC controller; no TZE pin or valley switching; 16-pin SOIC | Targets higher-power (>100 W), non-dimmable commercial lighting with strict THD limits | Choose NCP1653ADR2G only if fixed-frequency operation and separate PFC+regulation stages are acceptable design constraints |
Compared with UCC28810DR and NCP1653ADR2G, the UCC28811DR uniquely balances two-stage controllability, triac dimming fidelity, and CrM efficiency-making it the only option among the three that supports both valley-switched operation and coordinated enable signaling in multi-stage LED drivers.
Availability
UCC28811DR is available at Aetrix Electronics and suitable for street lighting, outdoor luminaires, and industrial area lighting requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for UCC28811DR 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of leadership in power conversion ICs.
The UCC28811DR belongs to TI's LED lighting power controller product line, engineered specifically for cost-sensitive, high-reliability AC-input LED drivers requiring power factor correction, triac dimming, and two-stage system interoperability.
FAQ
What is the primary function of the TZE pin on the UCC28811DR?
The TZE (Transformer Zero Energy) pin on the UCC28811DR detects the moment when energy in the transformer primary winding reaches zero-typically via a bias winding-triggering valley-switching for reduced switching losses. Its 1.25-V rising-edge threshold and internal clamps ensure reliable zero-crossing detection across line and load variations, directly enabling the UCC28811DR's critical conduction mode operation without external timing circuitry.
How does the UCC28811DR differ from the UCC28810DR in system-level integration?
The UCC28811DR differs from the UCC28810DR primarily in its 12.5-V UVLO turn-on threshold and 300-µA gM amplifier source current-both optimized for coordination with downstream PWM controllers in two-stage LED drivers. In contrast, the UCC28810DR's 15.8-V UVLO and 1.3-mA source current target single-stage retrofit applications where fast start-up and aggressive transient response are prioritized over upstream control signaling.
Can the UCC28811DR support triac dimming without additional circuitry?
Yes-the UCC28811DR integrates dedicated circuitry for triac dimming compatibility, including zero-power detection and slew-rate enhanced error amplification. When used with appropriate front-end filtering and snubbing, the UCC28811DR maintains stable regulation across full dimming range without external dimming interface ICs or complex compensation networks, as validated in TI's SLUS865 reference design for 25-W triac-dimmable PFC flyback.
What protection features are built into the UCC28811DR?
The UCC28811DR includes overvoltage protection (OVP) triggered at VSENSE > 2.69 V, open-feedback protection that disables switching if VSENSE is pulled low, enable/disable functionality for external control, and a 400-µs restart timer that forces gate drive activation if zero-energy detection fails. These protections operate autonomously without external supervision, ensuring robust fault containment in unattended LED lighting deployments.
Is the UCC28811DR suitable for outdoor lighting applications with wide temperature variation?
Yes-the UCC28811DR is specified for operation from –40°C to +105°C and packaged in an industrial-grade SOIC-8 (D) variant. Its thermal performance (150°C/W θJA) and parameter stability across temperature-verified in TI's SLUS865 datasheet figures for UVLO, VREF, and gM-make it suitable for streetlights, parking lot fixtures, and other outdoor LED applications exposed to extreme ambient conditions.
UCC28811DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- AC DC Offline Switcher
- Topology:
- Flyback, Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- -
- Voltage - Supply (Max):
- 18V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- Triac
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UCC28811DR FAQ
1.How can I place an order for UCC28811DR through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC28811DR 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 UCC28811DR reliable?
The price and inventory of UCC28811DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC28811DR is usually 5 days.
3.What payment methods are accepted for UCC28811DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC28811DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC28811DR?
UCC28811DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC28811DR 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 UCC28811DR?
For technical support, including UCC28811DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC28811DR requirements.
6.How does Aetrix verify that UCC28811DR is sourced from the original manufacturer or authorized distributors?
All UCC28811DR 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 UCC28811DR meets industry standards.
7.What is the process for return or replacement of UCC28811DR?
All UCC28811DR units undergo pre-shipment inspection (PSI). If there is an issue with UCC28811DR, 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 UCC28811DR part is unused and in its original packaging.
Return procedure for UCC28811DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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