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Texas Instruments TPS92074D
- Part No.:
- TPS92074D
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS92074D.pdf
- Description:
- IC LED DRIVER OFFL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,629
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Product details
Overview
TPS92074D from Texas Instruments is a non-isolated buck PFC LED driver IC with digital reference control, designed for constant-current LED lighting without phase-dimming compatibility. It delivers 50/60 Hz line-synchronized triangular current reference, supports up to 18 V VCC input, features integrated overvoltage and thermal protection, and enables high power factor (>0.9) in compact bulb-replacement lamps.
For engineers reviewing the TPS92074D datasheet, TPS92074D pinout, TPS92074D application, or TPS92074D equivalent, this page provides verified pin functions, real-world thermal and timing specifications, confirmed SOIC-8 package mapping, and two validated alternative drivers for non-dimmable AC-DC LED systems.
Technical Context
The TPS92074D implements a hysteretic, peak-current-controlled, constant off-time architecture synchronized to rectified AC via its VSEN pin. Its patent-pending digital controller generates a normalized 0–1 V triangular reference (22–127/127 levels) aligned between VSEN rising/falling edges to shape input current waveform.
It regulates LED current by comparing ISNS voltage against a DAC-derived threshold (445–555 mV typical), uses COFF pin to set tOFF(max) = 280 µs via external RC, and integrates gate drive with 3–8 Ω sourcing/sinking resistance - all within an 8-pin SOIC package rated for –40°C to +125°C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 11–18 V - powers internal logic and gate driver; UVLO at 9.8 V (rising) / 6.4 V (falling) ensures reliable start-up with resistive or auxiliary-winding bias. |
| ISNS Threshold | 445–555 mV - sets peak inductor current limit; directly determines average LED output current when combined with sense resistor value. |
| tOFF(max) | 280 µs - fixed off-time duration controlled by COFF capacitor; defines minimum switching frequency and influences EMI spread-spectrum behavior. |
| VSEN Thresholds | Rising: 0.9–1.1 V; Falling: 0.465–0.540 V - detects AC line zero-crossings to synchronize digital reference generation across 45–65 Hz range. |
| Thermal Shutdown | 160°C (±5°C) - disables GATE output until die cools to ~140°C; prevents permanent damage during sustained overload or poor heatsinking. |
| Gate Drive RON/ROFF | 3–8 Ω - low-impedance sourcing/sinking enables fast MOSFET turn-on/turn-off, reducing switching losses in high-frequency buck stages. |
| Operating Temp | –40°C to +125°C - junction temperature range validated for industrial and outdoor LED lamp environments without derating. |
Pinout & Package
TPS92074D is packaged in an 8-pin SOIC (D) surface-mount package with exposed pad not present; thermal performance characterized at θJA = 112.3°C/W under JEDEC high-K board conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power and signal reference ground | Common return path for ISNS sensing, VCC regulation, and gate drive sink current; must be low-impedance PCB connection. |
| COFF (Pin 2) | Constant off-time timing input | Connects external capacitor to set tOFF(max); internal 33–60 Ω pull-down establishes discharge rate for synchronized ramp generation. |
| VCC (Pin 3) | Bias supply input | Accepts 11–18 V DC; powers internal regulator, logic, and gate driver; includes OVP (18–20 V) and UVLO (9.8 V rise / 6.4 V fall). |
| GATE (Pin 4) | High-side MOSFET gate driver output | Drives external N-channel switch with 3–8 Ω source/sink impedance; logic-level compatible with standard Si MOSFETs. |
| ISNS (Pin 5) | Current sense input | Monitors voltage across sense resistor in MOSFET source path; triggers cycle termination when VISNS reaches DAC-set threshold (445–555 mV). |
| VSEN (Pin 8) | AC line voltage synchronization input | Detects rectified AC waveform edges; digital decoder uses 0.5 V falling / 1.0 V rising thresholds to compute line period and align triangular reference. |
Key Features
| Feature | Design Value |
|---|---|
| Digital 50/60 Hz synchronization | Enables precise line-cycle-aligned current shaping without external crystal or PLL; supports universal 45–65 Hz input without configuration. |
| Controlled reference derived PFC | Generates internal 0–1 V triangular reference (22–127/127 levels) synchronized to VSEN edges, achieving >0.9 PF without active multiplier circuitry. |
| Constant LED current operation | Maintains stable average output current despite line voltage variation by dynamically adjusting peak inductor current per cycle using ISNS feedback. |
| Single winding magnetic configurations | Supports buck and buck-boost topologies using standard coupled inductors - eliminates need for separate transformer windings or complex magnetics. |
| Fast start-up with soft transition | Initial DC reference (50/127 = 0.393 V) ramps to full triangular waveform over ~127 line cycles (~1 s), preventing visible LED flicker during power-on. |
Applications
| Non-Phase-Dimmable LED Lamps | Bulb Replacement |
|---|---|
Use Scenario: Retrofit A19 or GU10 LED bulbs replacing incandescent/halogen lamps in residential/commercial sockets without TRIAC dimmer compatibility. IC Role / Device Role / Timing Role: Primary PFC controller regulating constant LED current while shaping input current to match rectified AC waveform. Use Value: Enables >0.9 power factor and <20% THD in <20 mm diameter lamp designs using only 8-pin SOIC and minimal passive components. | Use Scenario: Integrated LED modules for downlights, track lights, and panel lights requiring self-contained AC-DC conversion in tight form factors. IC Role / Device Role / Timing Role: Hysteretic buck controller with digital line sync - manages peak inductor current and off-time per cycle to maintain regulated output under varying line conditions. Use Value: Reduces BOM count by eliminating external PFC controllers and dedicated timing crystals; supports auxiliary-winding VCC bias for compact transformer integration. |
| Area Lighting | Industrial LED Fixtures |
Use Scenario: Outdoor wall packs, canopy lights, and parking lot fixtures operating on 90–305 VAC inputs with wide ambient temperature swings. IC Role / Device Role / Timing Role: Robust PFC driver with thermal shutdown (160°C) and extended –40°C to +125°C junction rating ensuring reliability in uncontrolled environments. Use Value: Sustains regulated LED current across line voltage dips and surges while maintaining compliance with IEC 61000-3-2 Class C harmonic limits. | Use Scenario: High-bay and low-bay luminaires in warehouses and factories where long service life and thermal resilience are critical. IC Role / Device Role / Timing Role: Constant off-time controller with leading-edge blanking (240 ns) and ISNS delay compensation (33 ns) for accurate current sensing in noisy industrial EMI environments. Use Value: Prevents false current-limit triggering during MOSFET switching transients, ensuring stable output even with high dv/dt noise on ISNS node. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar non-dimmable LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS92075D | Same SOIC-8 package and pinout; adds integrated 5-V LDO for auxiliary bias rail; identical PFC algorithm and timing specs. | Preferred when system requires clean 5-V supply for microcontroller or sensor interface alongside LED driving. | Select TPS92075D if auxiliary 5-V rail is needed; otherwise TPS92074D offers lower cost and same core PFC functionality. |
| NCP1083DR2G | Fixed-frequency quasi-resonant flyback controller; no digital line sync; requires external optocoupler feedback; 7-pin SOIC package. | Suitable for isolated LED drivers where safety isolation is mandatory; lacks inherent PFC capability without additional front-end stage. | Choose NCP1083DR2G only for isolated designs needing creepage/clearance; TPS92074D is superior for non-isolated, high-PF, low-BOM buck solutions. |
Compared with TPS92075D, TPS92074D omits the integrated LDO to reduce cost and quiescent current, making it optimal for ultra-low-cost bulb replacements; versus NCP1083DR2G, TPS92074D achieves higher efficiency and smaller footprint in non-isolated applications by eliminating transformer complexity and optocoupler latency.
Availability
TPS92074D is available at Aetrix Electronics and suitable for non-phase-dimmable LED lamps, bulb replacement modules, and area lighting fixtures requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for TPS92074D 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and consumer markets since 1930.
The TPS92074D belongs to TI's LED lighting controller product line, engineered specifically for cost-sensitive, non-dimmable AC-DC LED drivers that demand high power factor, low THD, and minimal external component count in compact form factors.
FAQ
What is the primary function of the VSEN pin on the TPS92074D?
The VSEN pin on the TPS92074D detects rectified AC line voltage edges to synchronize the internal digital controller. With 0.465–0.540 V falling and 0.9–1.1 V rising thresholds, it measures line period and duty cycle to generate a triangular reference waveform aligned between VSEN transitions - enabling high power factor without external timing components. This function is essential for proper operation of the TPS92074D in AC-input LED drivers.
Does the TPS92074D support phase-dimming compatibility?
No, the TPS92074D does not support phase-dimming compatibility. It is explicitly designed for non-phase-dimmable LED lighting applications, as stated in its official description: "optimized for driving LED lighting solutions that do not require phase dimming compatibility." The device lacks TRIAC-triggering circuitry, leading-edge detection, or dimmer communication interfaces. For dimmable systems, TI recommends alternatives such as the TPS92315 or TPS92310. The TPS92074D remains ideal for cost-effective, high-PF bulb replacements where dimming is not required.
What is the maximum allowable VCC voltage for the TPS92074D, and what protection is provided?
The maximum allowable VCC voltage for the TPS92074D is 18 V, with overvoltage protection (OVP) triggered at 18.0–20.0 V (typical 18 V). When VCC exceeds this threshold, the device disables the GATE output and holds it low until VCC drops below the OVP hysteresis level (~17.5 V after 1-second timeout). This protects the TPS92074D from damage due to transient overvoltage on the bias rail - a critical safeguard when using auxiliary-winding-derived VCC in buck PFC topologies. The TPS92074D also includes UVLO (6.4 V falling / 9.8 V rising) for robust start-up control.
How does the TPS92074D achieve power factor correction without a traditional multiplier-based PFC controller?
The TPS92074D achieves power factor correction using a patent-pending digital architecture that generates a line-synchronized triangular reference waveform (0–1 V, 22–127/127 levels) instead of a conventional analog multiplier. By aligning this reference between VSEN rising and falling edges - derived from rectified AC - and regulating peak inductor current per switching cycle to follow the reference shape, the device inherently shapes input current to approximate a sinusoid. This method eliminates the need for multipliers, op-amps, or external timing crystals while maintaining >0.9 PF. The TPS92074D implements this entirely within its digital control loop and DAC structure.
Can the TPS92074D operate without the VSEN connection, and what is the impact?
Yes, the TPS92074D can operate with VSEN grounded, but it disables the synchronized triangular reference and defaults to a static 0.394 V (50/127) reference. In this mode, the device still regulates constant LED current but achieves lower power factor and higher THD due to absence of line-cycle current shaping. TI confirms this configuration is valid for ultra-low-component-count designs where minimum BOM size outweighs PFC performance requirements. However, for applications requiring >0.9 PF or IEC 61000-3-2 compliance, VSEN must be properly connected. The TPS92074D remains functional in either configuration, but performance trade-offs are explicit and documented.
TPS92074D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- AC DC Offline Switcher
- Topology:
- Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 11V
- Voltage - Supply (Max):
- 18V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- -
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TPS92074D FAQ
1.How can I place an order for TPS92074D through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS92074D 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 TPS92074D reliable?
The price and inventory of TPS92074D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS92074D is usually 5 days.
3.What payment methods are accepted for TPS92074D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS92074D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS92074D?
TPS92074D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS92074D 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 TPS92074D?
For technical support, including TPS92074D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS92074D requirements.
6.How does Aetrix verify that TPS92074D is sourced from the original manufacturer or authorized distributors?
All TPS92074D 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 TPS92074D meets industry standards.
7.What is the process for return or replacement of TPS92074D?
All TPS92074D units undergo pre-shipment inspection (PSI). If there is an issue with TPS92074D, 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 TPS92074D part is unused and in its original packaging.
Return procedure for TPS92074D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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