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Texas Instruments TPS61197DR
- Part No.:
- TPS61197DR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS61197DR.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,763
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Product details
Overview
TPS61197 from Texas Instruments is a current-mode boost controller IC for single-string white LED backlighting in LCD TVs, supporting 8–30 V input, programmable 50–800 kHz switching frequency, adaptive output voltage regulation up to 300 V, and PWM dimming with 5000:1 resolution at 200 Hz. It drives external MOSFETs and integrates LED open, IFB short, Schottky diode open/short, OVP, UVLO, and thermal shutdown protections.
For engineers reviewing the TPS61197 datasheet, TPS61197 pinout, TPS61197 application, or TPS61197 equivalent, this page delivers verified technical context, real-world design meaning of key specs, SOIC-16 package details, functional alternatives, and supply support for high-reliability TV backlight systems requiring precise current regulation and flicker-free dimming.
Technical Context
The TPS61197 implements peak-current-mode PWM control with slope compensation, using an external sense resistor (R5) on ISNS to set switch current limits-400 mV in PWM mode and 180 mV in PFM mode. Its error amplifier regulates the OVP pin to a 3.04 V reference, enabling adaptive output voltage tracking across varying LED forward voltages.
It features dual-stage protection logic: LED open detection latches off the device upon IFB voltage collapse during dimming-on time, while Schottky diode fault detection monitors OVP pin voltage (<70 mV for 80 ms) at startup. Soft-start is controlled by REF pin charging at 200 µA until reaching 2 V, with external capacitor (470 nF–4.7 µF) setting ramp time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8 V to 30 V - supports wide-range DC supplies common in LCD TV power architectures, including 12 V and 24 V rails. |
| Output Voltage Range | VIN to 300 V - enables driving long series strings (e.g., 24 LEDs @ ~3.3 V each = ~80 V), with adaptive boost minimizing conduction loss. |
| PWM Dimming Resolution | 5000:1 at 200 Hz - achieves deep, flicker-free dimming down to 0.02% duty cycle, critical for HDR contrast performance. |
| Switching Frequency Range | 50 kHz to 800 kHz - adjustable via external resistor on FSW pin; higher frequencies allow smaller magnetics but increase switching loss. |
| IFB Regulation Voltage | 300 mV ±7 mV - sets LED string current precisely via R9 = 300 mV / ILED; tight tolerance ensures <±2.3% current accuracy over temperature. |
| OVP Threshold | 2.98 V to 3.10 V - programs output overvoltage protection at VOUT = 3.04 V × (1 + R3/R4); prevents damage during LED open or load transients. |
| UVLO Threshold | 6.5 V to 7.0 V (VIN falling), with 300 mV hysteresis - ensures clean startup/shutdown and avoids brownout oscillation in unstable input conditions. |
Pinout & Package
TPS61197 is housed in a 16-pin SOIC package (17.90 mm × 7.50 mm), optimized for single-layer PCB layout in space-constrained TV backlight modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 UVLO | Input undervoltage lockout threshold adjust | Resistor divider from VIN sets custom UVLO turn-on/off points; internal 1.229 V reference and 3.9 µA hysteresis current enable precise control. |
| 2 EN | Enable/disable control input | Logic-high (>1.6 V) enables device with soft-start; logic-low (<0.75 V) disables all switching and discharges REF pin to 0 V. |
| 3 PWM | PWM dimming signal input | Accepts 90 Hz–22 kHz external PWM; controls LED on/off timing without affecting boost regulation loop stability. |
| 4 AGND | Analog ground reference | Separate ground for precision analog blocks (EA, IFB, OVP); must be routed away from PGND to avoid noise coupling into current sense path. |
| 5 REF | Soft-start timing reference | Charged at 200 µA to 2 V to initiate boost operation; external capacitor (470 nF–4.7 µF) sets soft-start duration and prevents inrush current. |
| 6 COMP | Error amplifier compensation node | Connects external RC network to stabilize feedback loop; critical for transient response and avoiding oscillation under dynamic LED load steps. |
| 7 IFB | LED current feedback input | Senses voltage across external R9; regulated to 300 mV for accurate constant-current drive; includes short-circuit and overvoltage (1.1 V) protection. |
| 8 IDRV | PWM dimming gate driver output | Drives external MOSFET/bipolar transistor base/gate during PWM off-time; complements GDRV for full LED string control. |
| 9 ISNS | High-side current sense positive input | Monitors voltage across R5 to enforce switch current limit (400 mV in PWM mode); enables robust overcurrent protection independent of LED load. |
| 10 OVP | Output voltage feedback & OVP detection | Regulated to 3.04 V reference; also serves as OVP input via resistor divider from VOUT; detects overvoltage and triggers latch-off. |
| 11 PGND | Power ground return | High-current return path for MOSFET source and sense resistor; must be low-inductance and separated from AGND to maintain sensing accuracy. |
| 12 GDRV | External MOSFET gate driver output | High-current (200 mA source / 400 mA sink) driver for N-channel switch; low impedance (2–10 Ω) minimizes switching losses and ringing. |
| 13 VDD | Internal LDO output | 7 V regulated supply for internal circuitry; requires ≥1 µF ceramic bypass capacitor; limited to 15 mA total load. |
| 14 FSW | Switching frequency programming | Resistor-to-ground sets fSW from 50–800 kHz per TI curve; e.g., 200 kΩ yields 200 kHz typical for balanced efficiency and EMI. |
| 15 FAULT | Open-drain fault indicator | Low during normal operation; high-impedance during faults (UVLO, OVP, thermal, LED open, etc.); requires external pull-up for system-level monitoring. |
| 16 VIN | Main power input | Accepts 8–30 V DC; powers internal LDO and gate drivers; absolute max rating is 33 V - requires input clamping for surge-prone TV power rails. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Boost Output Regulation | Maintains only the minimum VOUT required for the LED string, reducing MOSFET conduction loss and improving efficiency by up to 5% vs. fixed-output boost controllers. |
| Programmable Input UVLO with Adjustable Hysteresis | Enables reliable startup/shutdown sequencing in variable-input TV power supplies; hysteresis prevents chatter near threshold during line sag. |
| Built-in LED Open and IFB Short Protection | Latches off on open-circuit LED string or IFB short to ground, preventing uncontrolled VOUT rise and protecting downstream components. |
| Adjustable Soft-Start Independent of Dimming Duty Cycle | Ensures consistent startup behavior regardless of PWM state - eliminates brightness pop-in during power-on or dimming recovery. |
| Schottky Diode Open/Short Detection | Verifies rectifier integrity at startup and runtime; prevents catastrophic failure due to diode failure modes common in high-power backlight designs. |
Applications
| Large-Screen LCD TV Backlight | Commercial Display Monitor |
|---|---|
|
Use Scenario: Driving 24-series white LEDs (VF ≈ 80 V) from a 24 V DC rail in 55-inch+ LCD TVs with HDR support. IC Role / Device Role / Timing Role: Current-mode boost controller regulating LED string current to ±2.3% accuracy while adapting output voltage dynamically. Use Value: Enables 5000:1 PWM dimming depth at 200 Hz for >1000:1 contrast ratio, meeting UHD Premium certification requirements. |
Use Scenario: Powering dual 12-LED strings in professional-grade 32-inch medical and broadcast monitors requiring flicker-free operation. IC Role / Device Role / Timing Role: Single-chip solution managing boost conversion, current regulation, and synchronized PWM dimming control. Use Value: Eliminates need for separate dimming controllers and reduces BOM count by integrating protection logic and gate drivers. |
| Industrial Panel PC Backlight | Public Information Display |
|
Use Scenario: Operating in extended temperature range (−40°C to +85°C ambient) inside factory-floor panel PCs with 18-LED strings. IC Role / Device Role / Timing Role: Robust LED driver with thermal shutdown, UVLO hysteresis, and latch-off protections for unattended 24/7 operation. Use Value: Ensures zero field failures due to cold-start undervoltage or thermal overload, meeting industrial MTBF targets. |
Use Scenario: Outdoor kiosk display exposed to wide input voltage variation (12–28 V) and frequent on/off cycling in retail environments. IC Role / Device Role / Timing Role: Adaptive boost controller maintaining stable LED current despite input ripple and load transients. Use Value: Delivers consistent brightness and color point across input voltage swings, avoiding visible luminance drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3410XMY/NOPB | Fixed 1.6 MHz switching frequency; no programmable UVLO/OVP; lacks IFB short and Schottky fault detection. | Targeted at lower-cost, smaller displays (<15") with simpler protection needs; not rated for 300 V output or 5000:1 dimming. | Choose when cost sensitivity outweighs advanced protection and dimming fidelity; verify thermal derating at >1 A LED current. |
| MAX16820ATI+ | Integrated high-side MOSFET (no external switch); 40 V max output; supports analog + PWM dimming but only 1000:1 PWM resolution. | Suitable for compact monitor designs where board space is constrained and output voltage ≤40 V suffices. | Select when eliminating external MOSFET simplifies layout and reliability analysis, accepting lower output voltage headroom and dimming depth. |
Compared with LM3410XMY/NOPB and MAX16820ATI+, the TPS61197 uniquely combines 300 V output capability, 5000:1 PWM dimming, adaptive voltage regulation, and comprehensive fault detection - making it the only choice for premium large-screen LCD TV backlight systems demanding both safety and visual performance.
Availability
TPS61197 is available at Aetrix Electronics and suitable for LCD TV backlighting, commercial display monitors, and industrial panel PC lighting requiring stable component supply, long-term lifecycle support, and automotive-grade reliability validation.
Supply support for TPS61197 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 over 50 years of innovation in high-reliability power conversion solutions.
The TPS61197 belongs to TI's high-performance LED backlight controller product line, designed specifically for large-format LCD TVs requiring precise current regulation, adaptive voltage scaling, and robust fault coverage in high-temperature, high-voltage environments.
FAQ
What is the maximum output voltage supported by the TPS61197?
The TPS61197 supports an output voltage range from VIN up to 300 V, enabling it to drive long series strings of white LEDs - for example, 24 LEDs at ~3.3 V each (≈80 V) or configurations requiring higher headroom for aging or temperature drift. This 300 V rating is specified in the Recommended Operating Conditions table and validated across temperature and load.
How does the TPS61197 achieve 5000:1 PWM dimming resolution?
The TPS61197 achieves 5000:1 PWM dimming resolution by combining precise 300 mV IFB regulation, fast gate drivers (200 mA source / 400 mA sink), and minimal 10 µs recommended LED on-time. At 200 Hz, this yields a 0.02% minimum duty cycle - confirmed in Figure 1 and Figure 2 of the datasheet - ensuring flicker-free operation even at ultra-low brightness levels.
Can the TPS61197 operate without an external MOSFET?
No, the TPS61197 cannot operate without an external MOSFET. It is a controller IC - not a fully integrated converter - and relies on external high-side N-channel MOSFET (driven by GDRV and IDRV pins) and Schottky diode for boost topology operation. The datasheet explicitly states "driving one WLED string with multiple LEDs in series" using external power components.
What protection features are built into the TPS61197?
The TPS61197 integrates LED open, IFB short, Schottky diode open/short, output overvoltage (OVP), input undervoltage (UVLO), overcurrent (via ISNS), and thermal shutdown protections. Critical protections like LED open and Schottky faults trigger latch-off until power recycle, while FAULT pin provides open-drain status signaling for system-level fault handling.
Is the TPS61197 pin-compatible with any other TI LED drivers?
No documented pin-compatible alternatives exist for the TPS61197. Its 16-pin SOIC layout, function assignment (e.g., dedicated UVLO, IDRV, ISNS pins), and protection architecture are unique within TI's portfolio. Substitution would require PCB redesign, firmware updates, and revalidation - confirming TPS61197 as a purpose-built solution for high-end LCD TV backlighting.
TPS61197DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Type:
- DC DC Controller
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 8V
- Voltage - Supply (Max):
- 30V
- Voltage - Output:
- 8V ~ 300V
- Current - Output / Channel:
- -
- Frequency:
- 200kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
TPS61197DR FAQ
1.How can I place an order for TPS61197DR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61197DR 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 TPS61197DR reliable?
The price and inventory of TPS61197DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61197DR is usually 5 days.
3.What payment methods are accepted for TPS61197DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61197DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61197DR?
TPS61197DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61197DR 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 TPS61197DR?
For technical support, including TPS61197DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61197DR requirements.
6.How does Aetrix verify that TPS61197DR is sourced from the original manufacturer or authorized distributors?
All TPS61197DR 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 TPS61197DR meets industry standards.
7.What is the process for return or replacement of TPS61197DR?
All TPS61197DR units undergo pre-shipment inspection (PSI). If there is an issue with TPS61197DR, 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 TPS61197DR part is unused and in its original packaging.
Return procedure for TPS61197DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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