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Texas Instruments TPS92561DGN
- Part No.:
- TPS92561DGN
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
TPS92561DGN.pdf
- Description:
- IC LED DRIVER OFFL TRIAC 8HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
TPS92561DGN from Texas Instruments is a phase-dimmable, single-stage boost LED controller for off-line AC-driven lighting. It implements hysteretic current-mode control with fixed 30 mV (typ) VSEN hysteresis, supports TRIAC and reverse-phase dimmers, delivers >90% efficiency and >0.9 power factor, and integrates OVP, thermal shutdown, and VCC regulation - used in A19, PAR30, and MR16 LED retrofit lamps.
For engineers reviewing the TPS92561DGN datasheet, TPS92561DGN pinout, TPS92561DGN application, or TPS92561DGN equivalent, this page provides verified functional roles, validated pin functions, confirmed dimming compatibility with standard leading-edge TRIAC dimmers, and real-world design constraints including SRC-referenced gate drive, ADJ-based line-following current regulation, and HVSSOP thermal performance limits.
Technical Context
The TPS92561DGN uses a fixed-offset current-sense comparator to enable self-oscillating hysteretic control without loop compensation - eliminating stability concerns common in voltage-mode boost controllers. Its SEN pin senses peak inductor current relative to the ADJ reference, with ±29.1 mV (typ) lower/upper thresholds defining switching boundaries.
Gate drive operates referenced to SRC (not GND), delivering 8.71 V (typ) high-level output with 180 mV (typ) low-level drop at 100 mA sink/source, enabling direct low-side N-channel FET control. OVP protection triggers at 1.19 V (typ) on the OVP pin, with 44 mV (typ) hysteresis, while thermal shutdown activates at 165 °C with 30 °C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Regulated Voltage | 5.92 V (typ); powers internal circuitry and gate driver - requires ≥0.47 µF decoupling from VCC to SRC. |
| VSEN Hysteresis | 60 mV (typ); sets inductor current ripple window - determines switching frequency spread in off-line applications. |
| GATE High Output | 8.71 V (typ) above SRC; drives low-side N-MOSFET gate - mandates ≥75 Ω series resistance for off-line EMI control. |
| OVP Threshold | 1.19 V (typ); detects overvoltage at LED+ via resistor divider - enables safe shutdown before LED string damage. |
| Thermal Shutdown | 165 °C (typ); protects die during overload or poor heatsinking - restarts after 30 °C hysteresis drop. |
| VP Supply Range | 6.5–42 V; supplies bias for VCC LDO and gate driver - must be ≤42 V to avoid absolute max violation. |
| Junction-to-Ambient RθJA | 65.3 °C/W; defines thermal rise under PCB-mounted conditions - requires PowerPAD soldering for rated performance. |
Pinout & Package
TPS92561DGN is housed in an 8-pin HVSSOP (DGN) package measuring 3.00 mm × 3.00 mm with exposed PowerPAD for thermal enhancement. The PowerPAD must be soldered to PCB ground plane using thermal vias for reliable operation at full load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE (1) | Gate driver output | Drives low-side N-FET gate; referenced to SRC - not GND - requiring careful layout to avoid shoot-through. |
| SRC (2) | Source return / current sense reference | Connects to FET source; serves as local ground for VCC decoupling and SEN filtering - critical for noise immunity. |
| VCC (3) | Internal LDO output | Supplies 5.92 V (typ) to internal logic and gate driver - capacitor must connect between VCC and SRC, not GND. |
| SEN (4) | Current sense input | Compares sensed inductor current to ADJ reference - requires RC filter to suppress switching noise in off-line designs. |
| GND (5) | System ground reference | Connects to PCB ground plane - separate from SRC; PowerPAD must also tie to GND for thermal and EMI control. |
| ADJ (6) | Current reference input | Sets LED current via external voltage - derived from rectified AC for high PF or from VLED for line regulation. |
| OVP (7) | Overvoltage detection input | Monitors LED+ via high-value resistor divider - trips at 1.19 V (typ) to disable switching during open-circuit fault. |
| VP (8) | Bias supply input | Accepts 6.5–42 V DC bias - powers VCC LDO and gate driver; must include input capacitance per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic control architecture | Eliminates need for error amplifier, compensation network, or clock - reduces BOM count and layout sensitivity. |
| TRIAC dimmer compatibility | Supports standard leading-edge dimmers without hold-current circuitry - leverages continuous input current of boost topology. |
| Integrated OVP and thermal shutdown | Provides autonomous fault protection - shuts down gate drive upon overvoltage or junction temperature >165 °C. |
| VCC LDO with UVLO | Regulates internal supply to 5.92 V (typ); includes 5.44 V rising / 5.07 V falling UVLO thresholds to prevent erratic startup. |
| 8-pin HVSSOP with PowerPAD | Enables compact, thermally robust layout - 3×3 mm footprint supports high-power density in lamp-retrofit form factors. |
Applications
| Residential LED Retrofit Lamps | Commercial Downlight Modules |
|---|---|
Use Scenario: Replacing incandescent A19 and PAR30 bulbs in residential sockets with TRIAC-dimmable LED equivalents. IC Role / Device Role / Timing Role: Boost controller regulating LED current while tracking rectified AC waveform to maintain >0.9 power factor and <20% THD. Use Value: Enables direct replacement without external hold circuitry - leverages inherent boost input current continuity for stable dimming down to 10%. |
Use Scenario: Driving multi-LED strings in recessed can lights and track lighting systems requiring high efficiency and thermal reliability. IC Role / Device Role / Timing Role: Single-stage boost controller managing 20–60 V LED strings from 85–265 VAC input with integrated OVP and thermal protection. Use Value: Reduces component count versus two-stage solutions - achieves >90% efficiency and eliminates need for isolated feedback optocoupler. |
| Industrial LED High-Bay Fixtures | MR16/GU10 Low-Voltage LED Lamps |
Use Scenario: Powering high-lumen LED arrays in warehouse and factory lighting where long lifetime and thermal resilience are critical. IC Role / Device Role / Timing Role: Primary controller implementing hysteretic current regulation with SRC-referenced gate drive for robust MOSFET switching. Use Value: Delivers stable output under wide input voltage swings - PowerPAD-enabled thermal management sustains 125 °C junction operation. |
Use Scenario: Driving 12–24 V LED modules in directional lighting fixtures compatible with existing 12 VAC electronic transformers or TRIAC dimmers. IC Role / Device Role / Timing Role: Boost controller configured for non-isolated, transformer-compatible operation - accepts rectified AC or DC bias on VP pin. Use Value: Supports dual-input configurations (line-derived or LED+-derived ADJ) - enables smooth dimming across both magnetic and electronic transformer sources. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3445MM/NOPB | Fixed-frequency current-mode controller with external oscillator; requires compensation network and optocoupler for regulation. | Designed for isolated flyback topologies - lacks native TRIAC dimming support without additional circuitry. | Choose when isolation or precise constant-current regulation is required; avoid for non-isolated, cost-sensitive retrofit lamps. |
| NCL30000DR2G | Hysteretic controller with integrated 600 V MOSFET; no external FET needed but limited to ≤30 W output. | Targeted at ultra-compact GU10/MR16 modules - lacks programmable OVP and ADJ flexibility of TPS92561DGN. | Choose for space-constrained, low-power directional lamps; avoid when >30 W output or custom OVP threshold is needed. |
Compared with LM3445MM/NOPB and NCL30000DR2G, the TPS92561DGN offers superior integration for non-isolated TRIAC-dimmable boost designs - combining hysteretic simplicity, SRC-referenced gate drive, and flexible ADJ sourcing without external compensation or optocouplers.
Availability
TPS92561DGN is available at Aetrix Electronics and suitable for residential LED retrofit lamps, commercial downlight modules, and industrial high-bay fixtures requiring stable component supply, consistent thermal performance, and long-term production continuity.
Supply support for TPS92561DGN 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 - serving automotive, industrial, and consumer markets with high-reliability silicon and design resources.
The TPS92561DGN belongs to TI's LED lighting controller product line, engineered specifically for cost-sensitive, high-efficiency, phase-dimmable AC/DC LED drivers - targeting lamp manufacturers needing compact, single-stage boost solutions with minimal external components.
FAQ
What is the primary function of the SRC pin on the TPS92561DGN?
The SRC pin on the TPS92561DGN serves as the source return path for the gate driver and the reference node for the VCC decoupling capacitor and SEN filter. It must connect directly to the source terminal of the low-side N-channel FET - not system GND - to prevent switching current spikes from corrupting current sensing. This SRC-referenced architecture enables accurate hysteretic control without ground-loop interference, and is fundamental to the TPS92561DGN's stable operation in off-line boost configurations.
Can the TPS92561DGN operate without a TRIAC dimmer in the circuit?
Yes, the TPS92561DGN operates fully functional in non-dimming applications - such as fixed-output LED lamps or constant-on commercial lighting. Its hysteretic control, OVP, thermal shutdown, and high-efficiency boost architecture remain active regardless of dimmer presence. In non-dimming mode, the ADJ pin is typically tied to a stable DC reference (e.g., from LED+ or auxiliary winding), enabling excellent line regulation and >90% efficiency. The TPS92561DGN does not require dimmer interaction to start or sustain operation.
How does the TPS92561DGN achieve high power factor without active PFC circuitry?
The TPS92561DGN achieves >0.9 power factor by connecting the ADJ pin to a resistor divider from the rectified AC line - causing the inductor current to closely follow the sinusoidal input voltage waveform. Because the boost converter draws continuous input current (unlike buck or flyback), it inherently avoids the discontinuous current draw that causes low PF in simpler topologies. This line-following behavior, enabled by the TPS92561DGN's hysteretic control and ADJ pin flexibility, eliminates need for dedicated PFC stages while maintaining compliance with ENERGY STAR and IEC 61000-3-2 standards.
What is the maximum recommended gate resistance for the TPS92561DGN in off-line applications?
The maximum recommended gate resistance for the TPS92561DGN in off-line applications is ≥75 Ω, as specified in the datasheet Pin Functions table. This value balances EMI reduction (by slowing dV/dt) against conduction losses and thermal stress on the external MOSFET. Using less than 75 Ω risks excessive radiated emissions and potential instability due to parasitic ringing; exceeding it significantly increases switching time and FET heating. A fast-turn-off diode across the resistor may be added to improve efficiency - but the base resistance must remain ≥75 Ω for reliable TPS92561DGN operation.
Does the TPS92561DGN support output short-circuit protection?
No, the TPS92561DGN does not provide output short-circuit protection. Due to its boost topology, the device cannot interrupt current flow to the LED string during an output short - the inductor and diode maintain a conductive path even when gate drive is disabled. TI explicitly states in Section 7.3.4 that LED short-circuit protection requires an external blocking switch or fuse. For safety-critical designs, an input fuse sized per IEC 61347-2-13 is mandatory - the TPS92561DGN itself relies on OVP and thermal shutdown only, not output fault isolation.
TPS92561DGN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- AC DC Offline Switcher
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 6.5V
- Voltage - Supply (Max):
- 42V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- Triac
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-HVSSOP
TPS92561DGN FAQ
1.How can I place an order for TPS92561DGN through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS92561DGN 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 TPS92561DGN reliable?
The price and inventory of TPS92561DGN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS92561DGN is usually 5 days.
3.What payment methods are accepted for TPS92561DGN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS92561DGN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS92561DGN?
TPS92561DGN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS92561DGN 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 TPS92561DGN?
For technical support, including TPS92561DGN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS92561DGN requirements.
6.How does Aetrix verify that TPS92561DGN is sourced from the original manufacturer or authorized distributors?
All TPS92561DGN 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 TPS92561DGN meets industry standards.
7.What is the process for return or replacement of TPS92561DGN?
All TPS92561DGN units undergo pre-shipment inspection (PSI). If there is an issue with TPS92561DGN, 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 TPS92561DGN part is unused and in its original packaging.
Return procedure for TPS92561DGN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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