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Texas Instruments TPS923655DRRR
- Part No.:
- TPS923655DRRR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
TPS923655DRRR.pdf
- Description:
- 65-V, 4-A BOOST ORBUCK-BOOST LED
- Quantity:
- Payment:
- Shipping:
Inventory:2,701
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Product details
Overview
TPS923655DRRR from Texas Instruments is a 65V, 4A non-synchronous boost/buck-boost LED driver with integrated 150mΩ low-side NMOS FET, 100kHz–2.2MHz configurable switching frequency, spread spectrum EMI reduction, and inductive fast dimming (IFD) supporting hybrid dimming up to 1,000,000:1 at 120Hz PWM - used in high-accuracy medical lighting and machine vision strobes.
For engineers reviewing the TPS923655DRRR datasheet, TPS923655DRRR pinout, TPS923655DRRR application, or TPS923655DRRR equivalent, this page delivers verified package mapping (WSON-12), confirmed 6.5A cycle-by-cycle current limit, validated thermal foldback configuration via TEMP pin, and real-world dimming performance metrics across analog, PWM, and hybrid modes.
Technical Context
The TPS923655DRRR implements adaptive off-time current mode control with smart sampling for inductive fast dimming (IFD), enabling sub-150ns PWM pulse handling and precise current regulation across 0–100% duty cycles. Its dual-input dimming logic (EN/PWM and ADIM/HD pins) configures four distinct dimming modes without external controllers.
It integrates constant-current (CC) and constant-voltage (CV) regulation with LED open/short, sense resistor fault, thermal shutdown (165°C), and configurable thermal foldback (130°C start threshold). The internal 5.15V LDO powers external circuitry, while spread spectrum (±7%, 2kHz modulation) reduces EMI peaks for automotive and industrial lighting compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 4.5V to 63V - supports wide-range industrial DC supplies and battery stacks up to 12S Li-ion. |
| Max output current | 4A continuous - enables high-brightness LED strings (e.g., 12× 350mA LEDs) in single-layer PCB designs. |
| Switching FET RDS(on) | 150mΩ typical - minimizes conduction loss and thermal rise in compact WSON-12 package. |
| Dimming resolution | Hybrid dimming up to 1,000,000:1 at 120Hz - achieves deep dimming for surgical lighting without visible flicker. |
| Current sense threshold | 200mV ±3mV - ensures ±1.5% LED current accuracy across temperature and line variations. |
| Thermal shutdown | 165°C with 15°C hysteresis - protects against sustained overloads while allowing brief peak-power operation. |
| Switching frequency range | 100kHz to 2.2MHz - balances efficiency (lower fSW) and size (higher fSW) with external RFSET selection. |
Pinout & Package
TPS923655DRRR uses the WSON-12 (3.0mm × 3.0mm) thermally enhanced package with exposed thermal pad connected to PGND/AGND. Pin count is 12; no pin 13 or 14 as in VSON/SOT variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switching node | Connects to inductor and Schottky diode; carries full switching current and high dv/dt - requires tight layout and ground plane. |
| CSP / CSN | Current sense inputs | Differential pair measuring LED current via external sense resistor; 200mV reference enables accurate CC regulation. |
| VIN | Main power input | Accepts 4.5–63V DC; powers internal LDO and switching FET - requires ≥10µF low-ESR input capacitor. |
| VCC | LDO output | 5.15V regulated supply for internal logic; decoupled with 1µF ceramic cap to AGND for stable soft-start timing. |
| EN/PWM | Enable & PWM input | Active-high enable; accepts 150ns minimum PWM pulses for direct dimming control - no external gate driver needed. |
| ADIM/HD | Analog/hybrid dimming select | Configures dimming mode: high = PWM only, low = hybrid, PWM signal = analog/flexible - sets IFD behavior at startup. |
| FAULT | Open-drain fault indicator | Pulls low on LED open/short, thermal fault, or current-limit violation; requires external pull-up for system-level fault reporting. |
| TEMP | Thermal foldback control | Resistor-to-AGND sets foldback curve start point (130°C typical); direct AGND connection disables foldback. |
| FSET | Frequency set input | Resistor-to-AGND selects switching frequency (100kHz–2.2MHz); determines EMI profile and inductor size trade-off. |
| COMP | Error amplifier output | Connects to RC network for loop compensation; bandwidth tuned per LED string impedance and dimming dynamics. |
| PGND / AGND | Power & analog ground | Shared thermal pad serves both grounds - must be soldered to large copper area for thermal and noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| Inductive Fast Dimming (IFD) | Enables 150ns PWM pulses and hybrid dimming up to 1,000,000:1 - eliminates need for external MOSFET drivers in strobe applications. |
| Spread spectrum modulation | ±7% frequency dither at 2kHz - reduces peak EMI by >10dB, easing CISPR-25 Class 5 compliance in automotive lighting. |
| Configurable thermal foldback | Adjustable 130°C start threshold via external resistor - maintains output current during transient overheating without full shutdown. |
| Integrated 150mΩ NMOS FET | Eliminates external switch and associated gate drive complexity - reduces BOM count and PCB area in space-constrained LED modules. |
| Common-cathode LED support | Enables single-layer PCB routing and simplified interconnect - lowers assembly cost in multi-channel architectural lighting fixtures. |
Applications
| Medical Surgical Lighting | Machine Vision Strobes |
|---|---|
Use Scenario: High-CRI, flicker-free illumination for endoscopic and operating room lighting requiring precise brightness control down to 0.0001%. IC Role / Device Role / Timing Role: Constant-current LED driver with hybrid dimming and IFD - regulates current while synchronizing ultra-fast LED turn-on/off to camera exposure timing. Use Value: Achieves 1,000,000:1 dimming ratio at 120Hz without color shift or audible noise - meets IEC 60601-2-57 photobiological safety requirements. | Use Scenario: Synchronized flash illumination for high-speed industrial cameras capturing moving parts on production lines. IC Role / Device Role / Timing Role: Inductive fast dimming controller with 150ns PWM input capability - triggers microsecond-scale LED bursts aligned to camera shutter signals. Use Value: Delivers repeatable 10A peak current pulses with <1% jitter - enables sub-millisecond motion capture without motion blur. |
| Automotive Exterior Lighting | Professional Projection Systems |
Use Scenario: Adaptive front-lighting systems (AFS) and dynamic turn signals requiring EMI-compliant, thermally robust LED drivers. IC Role / Device Role / Timing Role: Boost/buck-boost LED driver with spread spectrum and thermal foldback - maintains stable output across 12V–48V vehicle bus fluctuations. Use Value: Meets CISPR-25 Level 5 radiated emissions with minimal filtering; survives junction temperatures up to 125°C under hood conditions. | Use Scenario: High-lumen laser TV and DLP projector light engines needing precise current stability and low-noise dimming. IC Role / Device Role / Timing Role: CC/CV-capable LED driver supporting both LED arrays and TEC cooling elements - manages dual power paths from single VIN rail. Use Value: Enables simultaneous LED brightness control and thermoelectric cooler regulation - improves image contrast and color uniformity over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS923655DMTR | VSON-14 package (4.5mm × 3.0mm); identical electrical specs and spread spectrum feature. | Better thermal performance (RθJA = 39.1°C/W vs. 47.4°C/W) but requires larger PCB footprint and different layout. | Select when higher power dissipation or extended thermal margin is required; not drop-in compatible due to pin count and pitch differences. |
| TPS923654DRRR | Same WSON-12 package and pinout; lacks spread spectrum; 6.5A current limit unchanged. | Lower EMI suppression capability; preferred where spectral purity matters more than conducted emissions (e.g., RF-sensitive lab equipment). | Choose when EMI filtering budget is constrained and spread spectrum is unnecessary; fully pin-compatible replacement with no layout change. |
Compared with TPS923655DRRR, TPS923655DMTR offers superior thermal resistance but demands board rework, while TPS923654DRRR provides identical mechanical fit and current capability without spread spectrum - making it a direct functional alternative where EMI mitigation is handled externally.
Availability
TPS923655DRRR is available at Aetrix Electronics and suitable for medical lighting, machine vision strobes, and automotive exterior lighting requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS923655DRRR 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 ICs, with decades of expertise in LED driver innovation and automotive-grade reliability.
The TPS92365x product line is designed for high-performance, thermally demanding LED applications requiring inductive fast dimming, wide input range, and integrated protection - targeting medical, industrial, and automotive lighting systems.
FAQ
What dimming modes does the TPS923655DRRR support, and how are they selected?
The TPS923655DRRR supports four dimming modes: PWM, analog, hybrid, and flexible - selected at startup via logic states on EN/PWM and ADIM/HD pins. For example, EN/PWM = PWM signal + ADIM/HD = low configures hybrid dimming. All modes leverage inductive fast dimming (IFD) for sub-150ns pulse handling. The TPS923655DRRR datasheet Table 7-2 defines exact pin configurations and timing requirements for each mode.
Does the TPS923655DRRR include spread spectrum, and how does it affect EMI performance?
Yes, the TPS923655DRRR includes enabled spread spectrum (±7% frequency dither at 2kHz), which spreads energy across a wider band to reduce peak EMI amplitudes. This allows smaller input filters and eases compliance with CISPR-25 Class 5 in automotive lighting. Unlike TPS923654DRRR, the TPS923655DRRR cannot disable this feature - it is factory-enabled and integral to its EMI reduction architecture.
What is the maximum LED current the TPS923655DRRR can deliver, and what limits it?
The TPS923655DRRR delivers up to 4A continuous LED current, limited by its 6.5A cycle-by-cycle current limit and thermal design. The actual output depends on external components: sense resistor value (RSENSE = 200mV / ILED), inductor saturation current, and PCB thermal management. At 4A, the 150mΩ internal FET dissipates ~2.4W - requiring proper heatsinking via the WSON-12 thermal pad to maintain ≤125°C junction temperature.
How does the TPS923655DRRR implement thermal foldback, and can it be disabled?
The TPS923655DRRR implements configurable thermal foldback starting at 130°C (typical), set by a resistor between TEMP pin and AGND. Lower resistor values increase foldback aggressiveness; connecting TEMP directly to AGND disables foldback entirely. This feature allows graceful current reduction during thermal overload instead of abrupt shutdown - preserving system uptime in intermittently hot environments like enclosed LED fixtures.
Is the TPS923655DRRR pin-compatible with other members of the TPS92365x family?
The TPS923655DRRR is pin-compatible with TPS923654DRRR (same WSON-12 package, identical pinout and function), but not with VSON-14 or SOT-23-THN variants. It shares the same 12-pin layout, thermal pad grounding, and electrical interface - enabling direct substitution where spread spectrum is acceptable or desired. Always verify current limit (6.5A) and spread spectrum status before replacement.
TPS923655DRRR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 63V
- Voltage - Output:
- 0V ~ 63V
- Current - Output / Channel:
- 4A
- Frequency:
- 100kHz ~ 2.2MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight, Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-WSON (3x3)
TPS923655DRRR FAQ
1.How can I place an order for TPS923655DRRR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS923655DRRR 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 TPS923655DRRR reliable?
The price and inventory of TPS923655DRRR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS923655DRRR is usually 5 days.
3.What payment methods are accepted for TPS923655DRRR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS923655DRRR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS923655DRRR?
TPS923655DRRR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS923655DRRR 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 TPS923655DRRR?
For technical support, including TPS923655DRRR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS923655DRRR requirements.
6.How does Aetrix verify that TPS923655DRRR is sourced from the original manufacturer or authorized distributors?
All TPS923655DRRR 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 TPS923655DRRR meets industry standards.
7.What is the process for return or replacement of TPS923655DRRR?
All TPS923655DRRR units undergo pre-shipment inspection (PSI). If there is an issue with TPS923655DRRR, 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 TPS923655DRRR part is unused and in its original packaging.
Return procedure for TPS923655DRRR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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