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Texas Instruments TPS92074DR
- Part No.:
- TPS92074DR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS92074DR.pdf
- Description:
- IC LED DRIVER OFFL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,073
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Product details
Overview
TPS92074DR 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 synchronization, regulated average LED current, and operates across –40°C to +125°C with VCC input range of 11–18 V and typical quiescent current of 2.5 mA.
For engineers reviewing the TPS92074DR datasheet, TPS92074DR pinout, TPS92074DR application, or TPS92074DR equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts for non-phase-dimmable LED lamp designs.
Technical Context
The TPS92074DR implements a hysteretic, peak-current-controlled, constant off-time architecture synchronized to rectified AC line via its VSEN pin. Its patent-pending digital controller generates a triangular reference waveform (0–1 V, 22–127/127 scale) aligned between VSEN rising/falling edges to achieve high power factor without requiring phase-cut dimming circuitry.
It integrates gate drive (3–8 Ω sourcing/sinking), ISNS-based current limiting (500 mV typical threshold), COFF-based off-time setting (1.20 V threshold), thermal shutdown (160°C trip), and VCC UVLO (10.5 V rise / 6.4 V fall) - all in an 8-pin SOIC package with GND, VCC, GATE, VSEN, ISNS, COFF, and two NC pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Input Range | 11–18 V - supports auxiliary winding or linear regulator bias; enables resistive start-up without external LDO. |
| ISNS Current Limit Threshold | 500 mV (typical) - sets peak inductor current via external sense resistor; determines maximum LED current per cycle. |
| COFF Off-Time Threshold | 1.20 V (typical) - defines constant off-time duration via external capacitor; directly controls switching frequency variation. |
| VSEN Detection Thresholds | 1.0 V (rising), 0.5 V (falling) - detects AC line zero-crossings digitally; enables synchronized triangular reference generation. |
| Thermal Shutdown | 160°C (trip), 140°C (hysteresis) - halts GATE output until die cools; prevents thermal runaway in enclosed fixtures. |
| GATE Drive Resistance | 3–8 Ω (both sourcing and sinking) - ensures fast MOSFET turn-on/turn-off; reduces switching losses in high-frequency buck stages. |
| UVLO Threshold | 10.5 V (rising), 6.4 V (falling) - wide hysteresis avoids oscillation during brown-out; supports coupled-inductor start-up. |
Pinout & Package
TPS92074DR is packaged in an 8-pin SOIC (D) with exposed pad not specified for thermal conduction. Pin 1 = GND, Pin 2 = COFF, Pin 3 = VCC, Pin 4 = GATE, Pin 5 = ISNS, Pin 6 = NC, Pin 7 = NC, Pin 8 = VSEN.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Circuit ground reference | Common return path for ISNS, VCC, and internal logic; must be low-impedance to avoid current-sense error. |
| COFF (Pin 2) | Off-time timing input | Connects external capacitor to set constant off-time; voltage ramp to 1.20 V triggers next switching cycle. |
| VCC (Pin 3) | Supply input | Power source for internal regulator and gate driver; includes OVP (18–20 V) and UVLO (10.5 V rise / 6.4 V fall). |
| GATE (Pin 4) | MOSFET gate driver output | Drives external N-channel MOSFET; 3–8 Ω on-resistance enables fast switching with minimal gate charge loss. |
| ISNS (Pin 5) | Current sense input | Monitors voltage across external sense resistor; compares to DAC-derived reference to terminate on-time. |
| VSEN (Pin 8) | AC line synchronization input | Detects rectified AC waveform edges; enables digital generation of line-synchronized triangular reference for PFC. |
Key Features
| Feature | Design Value |
|---|---|
| Digital 50/60 Hz Synchronization | Uses VSEN pin to detect line period (45–65 Hz); calibrates internal oscillator for precise triangular reference alignment. |
| Controlled Reference Derived PFC | Generates 0–1 V triangular reference synchronized to line; achieves >0.9 PF without phase-dimming circuitry or complex control loops. |
| Constant LED Current Operation | Maintains regulated average current via peak-current hysteresis control; compensates for line-cycle variation while preserving efficiency. |
| Single Winding Magnetic Configurations | Supports buck and buck-boost topologies using standard coupled inductors; eliminates need for separate auxiliary windings in many designs. |
| Overvoltage & Short-Circuit Protection | VCC OVP (18–20 V) disables GATE; ISNS short-circuit detection clamps output; prevents damage during LED open or overvoltage events. |
Applications
| Non-Phase-Dimmable LED Lamps | Bulb Replacement |
|---|---|
|
Use Scenario: Retrofit A19 or PAR30 LED bulbs replacing incandescent/halogen lamps in residential/commercial sockets. IC Role / Device Role / Timing Role: Primary PFC controller regulating constant LED current in buck topology; synchronizes switching to 50/60 Hz line for high PF. Use Value: Achieves >0.9 power factor with <20% THD using only 8-pin SOIC and single inductor; eliminates need for TRIAC-compatible circuitry. |
Use Scenario: Direct replacement of GU10 or E26 base LED modules in downlights and track lighting systems. IC Role / Device Role / Timing Role: Constant-current driver with integrated VCC bias management; handles cold-start via resistive or auxiliary-winding supply. Use Value: Enables compact PCB layout with minimal BOM: no external PFC controller, no dedicated line-sync IC, no separate gate driver. |
| Area Lighting | Commercial Indoor Fixtures |
|
Use Scenario: High-bay and parking garage luminaires operating from 90–305 VAC input with thermal constraints. IC Role / Device Role / Timing Role: Core PFC and current regulation IC; uses thermal shutdown (160°C) and VSEN-based line sync to maintain stable output under ambient drift. Use Value: Supports wide temperature range (–40°C to +125°C) and withstands sustained overvoltage transients up to 20 V on VCC. |
Use Scenario: Recessed troffer and panel lights in office buildings requiring UL Class P compliance and low EMI. IC Role / Device Role / Timing Role: EMI-optimized controller using emulated spread-spectrum off-time variation; allows smaller input filter with R-C snubber. Use Value: Reduces conducted/radiated emissions without ferrite chokes; passes CISPR-15 with filter on AC or DC side of bridge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar non-isolated buck PFC LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS92075DR | Same SOIC-8 package; adds programmable soft-start and enhanced OVP latch-off; identical VSEN/ISNS/COFF thresholds. | Preferred where controlled inrush current or latched fault response is required; not drop-in due to different startup behavior. | Select TPS92075DR when soft-start timing or fault-hold functionality is needed; otherwise TPS92074DR offers lower cost and simpler layout. |
| NCP1083ADR2G | Fixed-frequency CCM flyback PFC controller; requires transformer, optocoupler, and external MOSFET; no VSEN pin or digital line sync. | Suitable for isolated LED drivers needing safety isolation; incompatible with TPS92074DR's non-isolated buck architecture. | Choose NCP1083ADR2G only for isolated designs requiring reinforced insulation; TPS92074DR is superior for compact, low-cost, non-isolated lamps. |
Compared with TPS92075DR, the TPS92074DR lacks programmable soft-start but offers faster startup and lower BOM count; compared with NCP1083ADR2G, it eliminates transformer, optocoupler, and feedback loop complexity - enabling smaller, cheaper, and thermally efficient non-isolated LED drivers.
Availability
TPS92074DR is available at Aetrix Electronics and suitable for non-phase-dimmable LED lamps, bulb replacement modules, and area lighting applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS92074DR 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 specializing in analog, embedded processing, and power management technologies, with decades of leadership in LED driver innovation and automotive-grade reliability.
The TPS92074DR belongs to TI's LED lighting controller product line, engineered specifically for cost-sensitive, high-efficiency, non-dimmable AC-DC LED drivers that prioritize power factor correction, thermal robustness, and minimal external components.
FAQ
What is the primary function of the VSEN pin on the TPS92074DR?
The VSEN pin on the TPS92074DR detects the rising and falling edges of the rectified AC line voltage to enable digital synchronization of the internal triangular reference waveform. With 1.0 V rising and 0.5 V falling thresholds, it allows the TPS92074DR to generate a line-aligned reference that achieves >0.9 power factor without phase-dimming circuitry. This pin is essential for normal operation - if lost, the TPS92074DR defaults to a static 0.33 V reference.
How does the TPS92074DR implement constant LED current regulation?
The TPS92074DR regulates LED current using peak-current-mode hysteresis control: each switching cycle terminates when the voltage across the external ISNS sense resistor reaches the DAC-derived reference (typically 500 mV). The average LED current is stabilized by combining this per-cycle peak control with a line-synchronized triangular reference that modulates peak current over the AC cycle. This method maintains constant average current while achieving high power factor - a core feature of the TPS92074DR.
Can the TPS92074DR be used in buck-boost topology, and what changes are required?
Yes, the TPS92074DR supports buck-boost topology for higher THD-sensitive applications. To implement it, connect VSEN to the LED(–) node instead of the rectified AC rail - leveraging its 0.5 V/1.0 V thresholds against ground-referenced signals. This extends VSEN conduction time, ensuring reliable ramp activation. No changes to the TPS92074DR itself are needed; only the external sensing network and magnetic design differ from buck configurations.
What protection features are integrated into the TPS92074DR?
The TPS92074DR integrates overvoltage protection (VCC OVP trips at 18–20 V), feedback short-circuit protection (ISNS fault detection), thermal shutdown (160°C trip with 20°C hysteresis), and VCC undervoltage lockout (10.5 V rise / 6.4 V fall). These protections operate autonomously without external components - for example, VCC OVP disables the GATE output immediately upon overvoltage, and thermal shutdown holds GATE low until junction temperature drops to ~140°C. All are active in every TPS92074DR unit.
Is the TPS92074DR pin-compatible with other members of the TPS9207x family?
The TPS92074DR shares the same 8-pin SOIC (D) footprint and pinout with TPS92075DR, including identical assignments for GND, COFF, VCC, GATE, ISNS, and VSEN. However, functional differences exist: TPS92075DR adds programmable soft-start and latched OVP, altering startup behavior and fault response. While PCB layout is compatible, firmware or external timing components may require adjustment when substituting - the TPS92074DR is not a drop-in replacement for TPS92075DR in systems relying on those enhanced features.
TPS92074DR 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:
- 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
TPS92074DR FAQ
1.How can I place an order for TPS92074DR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS92074DR 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 TPS92074DR reliable?
The price and inventory of TPS92074DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS92074DR is usually 5 days.
3.What payment methods are accepted for TPS92074DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS92074DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS92074DR?
TPS92074DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS92074DR 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 TPS92074DR?
For technical support, including TPS92074DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS92074DR requirements.
6.How does Aetrix verify that TPS92074DR is sourced from the original manufacturer or authorized distributors?
All TPS92074DR 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 TPS92074DR meets industry standards.
7.What is the process for return or replacement of TPS92074DR?
All TPS92074DR units undergo pre-shipment inspection (PSI). If there is an issue with TPS92074DR, 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 TPS92074DR part is unused and in its original packaging.
Return procedure for TPS92074DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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