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Texas Instruments TPS92002DR
- Part No.:
- TPS92002DR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS92002DR.pdf
- Description:
- IC LED DRIVER OFFL TRIAC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,141
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Product details
Overview
TPS92002DR from Texas Instruments is a phase-cut TRIAC-dimmable, fixed-frequency current-mode PWM controller for off-line LED lighting drivers. It features 15-V UVLO turn-on threshold, 70% maximum duty cycle, 100-kHz switching frequency (with RRTC=10 kΩ, RRTD=4.32 kΩ, CCT=820 pF), and integrated 0.4-A source/0.8-A sink gate driver - enabling compact non-isolated buck or isolated flyback topologies in residential A19/E26/GU10 lamps.
For engineers reviewing the TPS92002DR datasheet, TPS92002DR pinout, TPS92002DR application, or TPS92002DR equivalent, this device is selected for TRIAC-dimmable LED drivers requiring stable 5-V reference output, low 130–170 µA standby current, and soft-start with programmable timing via SS pin - especially where board space constraints favor SOIC-8 packaging.
Technical Context
The TPS92002DR implements fixed-frequency current-mode control using an internal oscillator with dual-resistor timing (RTC/RTD) and a 1-V current-sense comparator threshold. Its PWM latch resets on CS ≥1 V or at programmed maximum duty cycle (70%), with GD output directly driving N-channel MOSFET gates.
It integrates undervoltage lockout (15-V turn-on, 6.2-V hysteresis), a buffered 5-V reference (±2.5% over load/line), and soft-start controlled by external capacitor on SS pin charged at 6 µA. The device operates from 21-V input and supports both isolated and non-isolated topologies without requiring optocoupler feedback for basic dimming compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| UVLO Turn-On Threshold | 15 V - ensures reliable startup only after input rail stabilizes above dimmer conduction minimum |
| Max Duty Cycle | 70% - limits peak primary current in flyback designs and prevents transformer saturation |
| Oscillator Frequency | 100 kHz (typ.) - balances EMI filtering requirements and MOSFET switching loss in 230-VAC systems |
| Gate Drive Capability | 0.4-A source / 0.8-A sink - directly drives mid-power MOSFETs (e.g., 100-mΩ, 500-pF gate) without buffer stage |
| Reference Output | 5.0 V ±2.5% - powers auxiliary circuitry (e.g., microcontroller, dimmer interface IC) with ≤2 mV line/load regulation |
| Standby Current | 130–170 µA - enables low-noise, high-PF operation during TRIAC zero-crossing intervals |
| Soft-Start Current | −7.0 µA (typ.) - linearly ramps duty cycle from 0% to full range over ~200 ms with 0.1-µF SS capacitor |
Pinout & Package
TPS92002DR is housed in an 8-pin SOIC (D) package (5.00 mm × 6.20 mm × 1.75 mm), RoHS-compliant, with NIPDAU lead finish and moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Current Sense Input | Summing node for primary-side current sense, slope compensation, and optocoupler feedback; includes internal 250-Ω discharge FET for leading-edge blanking |
| SS (Pin 2) | Soft-Start Control | Charged by internal 6-µA current source; controls ramp-up of duty cycle; pulled low disables GD and REF outputs |
| RTC (Pin 3) | Oscillator Timing Input (Rise) | Sets positive ramp time of internal oscillator via external resistor; senses CCT voltage at 3.33 V threshold |
| RTD (Pin 4) | Oscillator Timing Input (Fall) | Sets negative ramp time of internal oscillator via external resistor; senses CCT voltage at 1.67 V threshold |
| GND (Pin 5) | Power & Signal Ground | Common return for all analog and power circuits; must be low-inductance connection to minimize noise coupling into CS/SS |
| GD (Pin 6) | Gate Driver Output | Totem-pole output stage sinking up to 0.8 A; requires ≥3.9-Ω series gate resistor to limit dv/dt-induced ringing |
| VDD (Pin 7) | Supply Input | Shunt-regulated at 17.5 V; bypassed with 1-µF ceramic capacitor; powers internal circuitry and REF buffer |
| REF (Pin 8) | 5-V Reference Output | Buffered, low-noise 5-V source capable of sourcing up to 6 mA; requires 0.47-µF ceramic bypass to GND |
Key Features
| Feature | Design Value |
|---|---|
| TRIAC Phase-Cut Dimming Support | Enables direct integration with legacy wall dimmers without auxiliary AC sensing circuitry or complex synchronization logic |
| Integrated 5-V Reference | Eliminates need for external LDO when powering MCU, dimmer interface IC, or analog front-end components |
| Full-Cycle Soft Start | Prevents inrush current and audible transformer whine by linearly increasing duty cycle over user-defined time (via SS capacitor) |
| Low Startup Current | 110 µA typical - allows reliable start-up even with high-impedance bias networks used in capacitive-drop or resistive-dropper supplies |
| Programmable Oscillator | Frequency and max duty cycle set externally via two resistors (RTC/RTD) and one capacitor (CCT), enabling design flexibility across input ranges |
Applications
| Residential LED Lamps (A19/E26) | Architectural Wall Washing |
|---|---|
Use Scenario: Retrofit LED bulb replacing incandescent in standard E26 socket with leading-edge TRIAC dimmer. IC Role / Device Role / Timing Role: Primary PWM controller regulating LED current in non-isolated buck topology; synchronizes switching to dimmer conduction angle. Use Value: Achieves >0.9 PF and THD <20% without active PFC stage, meeting ENERGY STAR v2.0 requirements for integral lamps. |
Use Scenario: Linear LED strip driver mounted behind cove or recessed channel for uniform wall illumination. IC Role / Device Role / Timing Role: Fixed-frequency current-mode controller in isolated flyback configuration; provides stable dimming down to 5% with minimal flicker. Use Value: 70% max duty cycle prevents transformer core saturation at low dim levels, ensuring consistent lumen output across 100:1 dimming range. |
| Pathway & Outdoor Lighting | Overhead Commercial Fixtures |
Use Scenario: Weatherproof LED fixture for garden path lighting powered from 120/230-VAC mains with trailing-edge dimmer compatibility. IC Role / Device Role / Timing Role: Gate driver and oscillator core for high-efficiency flyback converter; UVLO threshold (15 V) rejects false triggering from dimmer leakage current. Use Value: 130–170 µA standby current minimizes no-load power draw (<0.5 W), satisfying IEC 62301 standby energy limits. |
Use Scenario: Ceiling-mounted troffer using multiple parallel LED strings driven from single-stage off-line supply. IC Role / Device Role / Timing Role: Current-mode PWM controller managing primary-side regulation; REF pin powers string-current monitoring IC and thermal foldback circuit. Use Value: Buffered 5-V reference delivers stable bias under dynamic load transients, enabling accurate closed-loop current regulation without secondary-side feedback. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED lighting PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS92001DR | 10-V UVLO turn-on (vs. 15 V); 110–125 µA standby current; identical pinout and feature set | Better suited for lower-input-voltage DC-fed or universal-input designs with tighter UVLO margin | Select TPS92001DR when operating from 12-V bus or with reduced input hold-up requirements |
| NCP1014PST | Fixed-frequency voltage-mode controller; no integrated 5-V REF; 700-V integrated MOSFET; no TRIAC dimming support | Targets cost-sensitive, non-dimmable AC/DC SMPS with integrated switch; lacks phase-cut compatibility | Choose NCP1014PST only for non-dimmable, single-chip flyback designs where BOM count reduction outweighs dimming capability loss |
Compared with TPS92002DR, TPS92001DR offers lower UVLO for wider input range but reduced dimmer compatibility margin, while NCP1014PST eliminates external MOSFET but forfeits TRIAC dimming and reference output - making TPS92002DR uniquely balanced for dimmable residential LED drivers requiring auxiliary power and robust startup behavior.
Availability
TPS92002DR is available at Aetrix Electronics and suitable for residential LED lamp design, architectural lighting systems, and outdoor pathway fixtures requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for TPS92002DR 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 leadership in LED driver ICs for energy-efficient lighting.
The TPS9200x family was designed specifically for single-stage, TRIAC-dimmable LED drivers targeting residential and commercial retrofit lamps - prioritizing PF, THD, dimming linearity, and board-area efficiency over general-purpose SMPS flexibility.
FAQ
What is the UVLO threshold of the TPS92002DR, and how does it affect TRIAC dimmer compatibility?
The TPS92002DR has a 15-V UVLO turn-on threshold with 6.2-V hysteresis. This higher threshold ensures reliable startup only after the TRIAC dimmer conducts fully, rejecting false triggering from leakage current during off-phase intervals. In practice, this improves dimmer compatibility across leading-edge dimmers and reduces pop-on artifacts in A19 bulbs - a key differentiator versus the 10-V TPS92001DR variant. The TPS92002DR thus maintains stable operation even with low-conduction-angle dimmer settings.
Can the TPS92002DR drive a MOSFET directly, and what gate resistor value is recommended?
Yes, the TPS92002DR integrates a 0.4-A source / 0.8-A sink totem-pole gate driver capable of directly driving N-channel MOSFETs. Texas Instruments specifies a minimum series gate resistor of 3.9 Ω to limit peak gate current and suppress ringing caused by parasitic inductance. This value balances switching speed (tRISE = 35 ns, tFALL = 18 ns with 1-nF load) against EMI and shoot-through risk - critical for maintaining clean dimming waveforms in TRIAC-based systems using the TPS92002DR.
How is the oscillator frequency set on the TPS92002DR, and what tolerance should be expected?
The TPS92002DR oscillator frequency is set by external components: RRTC (pin 3), RRTD (pin 4), and CCT (timing capacitor). With RRTC = 10 kΩ, RRTD = 4.32 kΩ, and CCT = 820 pF, the typical frequency is 100 kHz (range 90–110 kHz). Frequency variation is ±10% over temperature and line voltage due to internal oscillator architecture; the 0.1%/V frequency change with VDD further necessitates stable biasing. Designers must place RTC/RTD resistors close to pins and route CCT directly to GND to minimize noise coupling - a requirement explicitly validated for the TPS92002DR in TI's SLUSA24A datasheet.
Does the TPS92002DR require an optocoupler for feedback in isolated designs?
No, the TPS92002DR does not require an optocoupler for basic TRIAC-dimming functionality in isolated flyback designs. Its current-mode architecture uses primary-side sensing via the CS pin, and dimming is achieved by modulating input current through the TRIAC - eliminating secondary-side feedback for dimming control. However, precise constant-current regulation across line/load variations may still benefit from optocoupler-based voltage feedback in high-accuracy applications. The TPS92002DR's REF pin can power the optocoupler's LED side, simplifying implementation.
What is the purpose of the SS (soft-start) pin on the TPS92002DR, and how is it implemented?
The SS pin on the TPS92002DR controls full-cycle soft-start by charging an external capacitor with a precision 6-µA internal current source. As the SS voltage ramps from 0.4 V to 2.0 V, the output duty cycle increases linearly from 0% to its programmed maximum - preventing inrush current and transformer saturation. If SS falls below 0.5 V, GD and REF are disabled. This behavior is confirmed in the TPS92002DR's Electrical Characteristics table (ISS = −7.0 µA typ.) and Functional Block Diagram, making it essential for reliable startup in high-power LED drivers using the TPS92002DR.
TPS92002DR 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)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- -
- Voltage - Supply (Max):
- 21V
- Voltage - Output:
- 5V
- Current - Output / Channel:
- -
- Frequency:
- 100kHz
- Dimming:
- Triac
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TPS92002DR FAQ
1.How can I place an order for TPS92002DR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS92002DR 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 TPS92002DR reliable?
The price and inventory of TPS92002DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS92002DR is usually 5 days.
3.What payment methods are accepted for TPS92002DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS92002DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS92002DR?
TPS92002DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS92002DR 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 TPS92002DR?
For technical support, including TPS92002DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS92002DR requirements.
6.How does Aetrix verify that TPS92002DR is sourced from the original manufacturer or authorized distributors?
All TPS92002DR 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 TPS92002DR meets industry standards.
7.What is the process for return or replacement of TPS92002DR?
All TPS92002DR units undergo pre-shipment inspection (PSI). If there is an issue with TPS92002DR, 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 TPS92002DR part is unused and in its original packaging.
Return procedure for TPS92002DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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