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Texas Instruments TPS92391RHBR
- Part No.:
- TPS92391RHBR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
TPS92391RHBR.pdf
- Description:
- IC LED DRIVER CTRLR PWM 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:8,545
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Product details
Overview
TPS92391 from Texas Instruments is an automotive-grade, high-efficiency LED driver IC with integrated boost/SEPIC DC/DC controller and six precision 200-mA current sinks. It delivers 32,000:1 dimming ratio at 152 Hz PWM output, supports I²C and analog/PWM brightness control, and operates across 3 V to 48 V input for large-screen display backlighting in medical and industrial panels.
For engineers reviewing the TPS92391 datasheet, TPS92391 pinout, TPS92391 application, or TPS92391 equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specs, real-world fault diagnostics coverage, and two rigorously cross-checked alternative parts for display backlight design.
Technical Context
The TPS92391 integrates a current-mode boost/SEPIC controller with adaptive output voltage regulation-dynamically adjusting VOUT to match the minimum headroom required across all active LED strings (0.7 V typical). Its six current sinks support auto-phase-shifted PWM dimming, where phase offset is automatically calculated (e.g., 90° for four strings) based on LED_SET resistor configuration.
It implements hybrid dimming: simultaneous 12-bit analog current scaling and up to 16-bit PWM resolution via I²C or external PWM input, reducing EMI while extending LED lifetime. Fault protection includes open/short-to-ground LED detection, VIN OVP/UVP/OCP, boost OVP/OCP, thermal shutdown (150°C trip), and resistor-out-of-range monitoring on ISET, BST_FSET, PWM_FSET, LED_SET, and MODE pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 48 V - supports wide automotive and industrial supply rails without pre-regulation. |
| LED Current Sink Max | 200 mA per channel - enables direct drive of high-brightness LED strings without external amplification. |
| Current Matching | 1% typical - ensures uniform luminance across multi-string displays without manual calibration. |
| Dimming Ratio | 32,000:1 at 152 Hz - achieves deep black levels in medical imaging and high-contrast industrial HMI. |
| Boost Switching Freq | 100 kHz to 2.2 MHz - avoids AM radio band interference and allows compact magnetics selection. |
| Thermal Shutdown | 150°C trip / 130°C hysteresis - protects against sustained overloads in sealed enclosures. |
| I²C Interface Speed | 400 kHz - enables fast register writes for dynamic brightness updates in real-time UIs. |
Pinout & Package
TPS92391 is housed in a thermally enhanced 32-pin QFN package (5 mm × 5 mm, RHB suffix), with exposed thermal pad (DAP) connected to LED_GND for efficient heat dissipation in high-power backlight designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1–OUT6 | LED current sink outputs | Each drives up to 200 mA; unused channels must be tied to LED_GND to disable and exclude from adaptive voltage control. |
| ISET | Full-scale current reference | Sets max sink current (30–200 mA) via external resistor; shorting to GND limits output to 280 mA for fault margin. |
| PWM_FSET | LED dimming frequency control | Resistor selects PWM output frequency from 141 Hz to 20.9 kHz - determines dimming resolution and EMI profile. |
| BST_FSET | Boost switching frequency control | Resistor sets boost FSW from 100 kHz to 2.2 MHz - balances efficiency, size, and EMI compliance. |
| LED_SET | String count configuration | Resistor defines 1–8 LED string count; device auto-configures phase shift and disables unused outputs. |
| INT | Fault interrupt output | Open-drain signal asserts on any detected fault (open/short LED, OVP, thermal, etc.); cleared via I²C or EN falling edge. |
| GD | External N-FET gate driver | Drives high-side power FET for battery isolation and reverse-polarity protection in automotive systems. |
| VSENSE_P / VSENSE_N | VIN sensing inputs | Monitor input voltage for OVP (43 V typ) and OCP (220 mV across sense resistor); enable precise system-level protection. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-phase-shift PWM dimming | Eliminates beat frequencies and ripple in multi-string backlights by dynamically aligning phase offsets per active channel count. |
| Adaptive boost voltage control | Reduces power loss up to 15% by continuously tracking LED forward voltage and setting VOUT to minimum required headroom (0.7 V). |
| Hybrid dimming architecture | Combines 12-bit analog current scaling with 16-bit PWM for flicker-free, low-EMI brightness control across full 32,000:1 range. |
| Comprehensive fault diagnostics | Detects open/short-to-GND LED strings, VIN OVP/UVP/OCP, boost OVP/OCP, thermal overload, and out-of-range configuration resistors. |
| Charge pump gate driver | Generates regulated 5-V gate drive (±0.2 V accuracy) for external N-FETs when VDD < 4.5 V - enables robust boost operation from low-voltage rails. |
Applications
| Medical Imaging Displays | Industrial Control Panels |
|---|---|
Use Scenario: High-contrast, flicker-free backlight for diagnostic monitors requiring DICOM-compliant grayscale rendering and zero motion blur. IC Role / Device Role / Timing Role: TPS92391 acts as the primary LED current controller and boost regulator, delivering synchronized, phase-shifted PWM to six independent LED strings with <1% current matching. Use Value: Enables 32,000:1 dimming depth and adaptive VOUT control to maintain consistent luminance across temperature and aging - critical for clinical image fidelity. |
Use Scenario: Ruggedized HMI backlight in factory automation panels exposed to wide ambient temperatures (–40°C to +85°C) and EMI-heavy environments. IC Role / Device Role / Timing Role: TPS92391 serves as fault-resilient LED driver with built-in OVP/OCP/thermal protection and spread-spectrum boost to meet CISPR-25 Class 5 emissions limits. Use Value: Reduces system-level BOM cost by integrating protection, dimming, and boost control - eliminating need for discrete supervisors and external gate drivers. |
| Automotive Infotainment | Test & Measurement Equipment |
Use Scenario: AEC-Q100 qualified backlight for center-stack displays operating from 6–16 V battery with cold-crank tolerance down to 3 V. IC Role / Device Role / Timing Role: TPS92391 functions as automotive-grade LED driver with UVLO programmability (via UVLO pin), reverse-battery protection (via SD/GD), and ASIL-B compatible fault reporting via INT pin. Use Value: Supports seamless brightness transitions during engine start-up via soft-start and adaptive VOUT - prevents visible backlight dip during cranking. |
Use Scenario: Precision backlight for oscilloscope and spectrum analyzer screens requiring stable luminance under varying signal processing loads. IC Role / Device Role / Timing Role: TPS92391 operates as digitally controlled, low-noise LED driver with I²C register access for real-time brightness calibration and fault logging. Use Value: Provides 16-bit I²C dimming resolution and <0.5% current drift over temperature - ensures measurement repeatability across lab conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409QMH/NOPB | Single-channel buck-boost LED controller; no integrated current sinks, requires external MOSFETs and sense resistors per channel. | Lacks multi-string phase control, I²C interface, and auto-adaptive VOUT - suited for simpler, lower-channel-count designs. | Select when cost-sensitive, single-string applications prioritize discrete flexibility over integration and diagnostics. |
| MAX20050ATP/V+T | 6-channel 150-mA automotive LED driver with I²C; fixed 2.2-MHz boost FSW, no BST_SYNC or spread spectrum, 10,000:1 dimming ratio. | No auto-phase-shift PWM or hybrid dimming; limited to 150 mA/channel and lacks VIN OCP/VSENSE_N sensing capability. | Choose for space-constrained designs needing AEC-Q100 Grade-1 rating and simplified layout - but verify reduced dimming depth meets UI requirements. |
Compared with LM3409QMH/NOPB and MAX20050ATP/V+T, the TPS92391 uniquely combines six 200-mA current sinks, adaptive VOUT, auto-phase-shift PWM, and comprehensive fault coverage - making it optimal for high-reliability, multi-string display backlighting where luminance uniformity and system-level protection are critical.
Availability
TPS92391 is available at Aetrix Electronics and suitable for medical imaging displays, industrial control panels, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and AEC-Q100 qualified performance.
Supply support for TPS92391 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, with decades of automotive and industrial qualification expertise.
The TPS92391 belongs to TI's high-performance LED driver product line, designed specifically for automotive and industrial display backlighting applications demanding high dimming fidelity, robust fault handling, and wide-input-voltage operation.
FAQ
What is the maximum LED string voltage supported by the TPS92391?
The TPS92391 supports up to 48 V on its VOUT pin, enabling direct drive of multi-LED strings (e.g., 12–15 white LEDs in series at 3.2 V each). The FB pin uses an external resistor divider to set the exact boost output voltage, and adaptive voltage control ensures VOUT remains just above the highest LED string forward voltage plus 0.7 V headroom - minimizing power loss while maintaining regulation for the TPS92391.
How does the TPS92391 achieve 32,000:1 dimming ratio?
The TPS92391 achieves 32,000:1 dimming ratio using hybrid control: 152-Hz PWM output with 16-bit resolution (65,536 steps) combined with 12-bit analog current scaling. This dual-stage approach eliminates low-duty-cycle instability and flicker. The ratio is measured at 152 Hz; higher PWM frequencies (e.g., 4.88 kHz) reduce the ratio to 1,000:1 due to timing constraints - both modes are fully supported by the TPS92391.
Can the TPS92391 drive more than six LED strings?
No - the TPS92391 has exactly six dedicated current sink outputs (OUT1–OUT6). However, multiple TPS92391 devices can be synchronized via the BST_SYNC pin for coordinated operation across larger displays. Each TPS92391 independently configures its own phase shift based on its LED_SET resistor value, ensuring seamless brightness alignment without external timing controllers.
What fault conditions trigger the INT pin on the TPS92391?
The INT pin on the TPS92391 asserts low for open-string, short-to-ground, or shorted LED detection; boost OVP/OCP; VIN OVP/UVP/OCP (via VSENSE_P/VSENSE_N); thermal shutdown (>150°C); VDD UVLO; and out-of-range configuration resistors (ISET, LED_SET, PWM_FSET, BST_FSET, MODE). Fault status is latched and cleared either by writing to the FAULT_CLEAR register via I²C or on the falling edge of the EN pin - a key diagnostic feature of the TPS92391.
Is the TPS92391 AEC-Q100 qualified?
Yes - the TPS92391 is qualified to AEC-Q100 Grade 1 (–40°C to +125°C ambient), with tested ESD performance (±2000 V HBM, ±750 V CDM on corner pins), and automotive-grade reliability validation including HTOL, TC, and UHAST. Its design incorporates automotive-specific features such as programmable UVLO (via UVLO pin), reverse-battery protection (via SD/GD), and fault reporting aligned with functional safety concepts - confirming its suitability for front-end display systems in vehicles.
TPS92391RHBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- SEPIC, Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 0V ~ 48V
- Current - Output / Channel:
- -
- Frequency:
- 100kHz ~ 2.2MHz
- Dimming:
- Analog, I2C, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (5x5)
TPS92391RHBR FAQ
1.How can I place an order for TPS92391RHBR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS92391RHBR 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 TPS92391RHBR reliable?
The price and inventory of TPS92391RHBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS92391RHBR is usually 5 days.
3.What payment methods are accepted for TPS92391RHBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS92391RHBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS92391RHBR?
TPS92391RHBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS92391RHBR 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 TPS92391RHBR?
For technical support, including TPS92391RHBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS92391RHBR requirements.
6.How does Aetrix verify that TPS92391RHBR is sourced from the original manufacturer or authorized distributors?
All TPS92391RHBR 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 TPS92391RHBR meets industry standards.
7.What is the process for return or replacement of TPS92391RHBR?
All TPS92391RHBR units undergo pre-shipment inspection (PSI). If there is an issue with TPS92391RHBR, 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 TPS92391RHBR part is unused and in its original packaging.
Return procedure for TPS92391RHBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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