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Texas Instruments TPS61196PWPR
- Part No.:
- TPS61196PWPR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS61196PWPR.pdf
- Description:
- IC LED DRVR CTRLR PWM 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:9,218
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Product details
Overview
TPS61196 from Texas Instruments is a 6-string, 400-mA white LED driver IC with independent PWM dimming per string, adaptive boost output up to 120 V, ±1.5% current matching between strings, and programmable 100–800 kHz switching frequency - designed for high-precision LCD TV backlight systems requiring stable current regulation across multiple LED strings.
For engineers reviewing the TPS61196 datasheet, TPS61196 pinout, TPS61196 application, or TPS61196 equivalent, this page delivers verified technical context, real-world dimming resolution (up to 5000:1), thermal shutdown behavior, OVP/UVLO programmability, and precise IFB voltage regulation - all critical for backlight power architecture validation and layout-sensitive WLED driver selection.
Technical Context
The TPS61196 integrates a current-mode boost controller with six independent current sinks, each regulated via feedback at its IFB pin to maintain constant LED current from 50 mA to 400 mA. Its adaptive output voltage dynamically tracks the highest forward voltage string plus programmable headroom (0.3–1 V), minimizing power loss.
Each string accepts dedicated PWM inputs (PWM1–PWM6) operating from 90 Hz to 22 kHz, enabling high-fidelity dimming without color shift. Internal protection includes ISET short-to-ground detection, IFB short-to-ground sensing, LED open/short detection, overvoltage (OVP), undervoltage lockout (UVLO), and thermal shutdown at 150°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8 V to 30 V - supports wide-range DC bus supplies common in LCD TV power architectures. |
| Max Output Voltage | 120 V - sufficient for driving long series strings of high-Vf white LEDs (e.g., 16–20 LEDs @ ~3.3 V each). |
| Switching Frequency | 100 kHz to 800 kHz - set by external resistor on FSW pin; enables EMI optimization and inductor size trade-offs. |
| Current Matching | ±1.5% between strings - ensures uniform brightness across multi-string backlight panels without per-string calibration. |
| PWM Dimming Resolution | Up to 5000:1 - achieves deep dimming (0.02% duty cycle) while maintaining linearity and avoiding flicker. |
| IFB Regulation Voltage | 508 mV typical - precise reference for current sink accuracy; minimum headroom programmable via IFBV pin (0.3–1 V). |
| Thermal Shutdown | 150°C with 15°C hysteresis - protects against sustained overload or poor heatsinking in sealed TV enclosures. |
Pinout & Package
TPS61196 is housed in a thermally enhanced 28-pin HTSSOP (PWP) package (9.70 mm × 4.40 mm) with exposed thermal pad for PCB-level heat dissipation. Pin count and layout support full six-string control, independent PWM inputs, dual protection monitoring (OVP, UVLO), and flexible loop compensation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Accepts 8–30 V DC; feeds internal LDO and boost controller primary side. |
| EN | Enable control | Active-high logic input (1.8 V threshold); initiates soft-start sequence when asserted. |
| PWM1–PWM6 | Digital dimming interface | Independent 90 Hz–22 kHz PWM inputs per string; no shared timing constraints. |
| IFB1–IFB6 | Current sink feedback | Analog sense nodes for individual string current regulation; monitored for open/short/fault conditions. |
| ISET | Global current reference | Sets full-scale current (50–400 mA) via external resistor; accuracy maintained by 1.229 V internal reference. |
| FBP | LED cross-short threshold | Programs fault threshold for detecting inter-string shorts using resistor-to-GND. |
| OVP | Output overvoltage monitor | Resistor-divider input for setting 2.95–3.09 V OVP threshold at internal comparator. |
| UVLO | Input undervoltage monitor | Adjustable threshold (1.229 V) for custom VIN lockout; supports hysteresis via external current source. |
| GDRV | External MOSFET gate drive | High-current (400 mA sink / 200 mA source) output for discrete N-channel switch control. |
| COMP | Error amplifier output | Connect RC network here to stabilize boost loop; transconductance = 90–150 µS. |
| REF | Soft-start timing node | Charged by internal 200 µA/10 µA current sources; capacitor value (1–4.7 µF) sets ramp time. |
| FAULT | Open-drain fault indicator | Asserts low during UVLO, OVP, thermal shutdown, LED open/short, or IFB short events. |
Key Features
| Feature | Design Value |
|---|---|
| Independent per-string PWM dimming | Enables local dimming zones in LCD TVs without inter-string crosstalk or synchronization overhead. |
| Adaptive boost output voltage | Reduces power loss by dynamically adjusting VOUT to only exceed the highest-string forward voltage + headroom. |
| Built-in IFB short-to-ground protection | Detects failed LED string wiring or solder shorts before damage occurs; triggers FAULT assertion. |
| Programmable soft-start time | Configurable via REF capacitor (1–4.7 µF); prevents inrush current into large output capacitors during startup. |
| Integrated LED open/short diagnostics | Automatically identifies open-circuit or shorted LED strings during operation and reports via FAULT pin. |
Applications
| LCD TV Backlight | Scan Mode LCD TV Backlight |
|---|---|
|
Use Scenario: Driving six parallel strings of 16–20 white LEDs in edge-lit or direct-lit LCD TV panels. IC Role / Device Role / Timing Role: Primary WLED current regulator and adaptive boost controller with per-string dimming control. Use Value: Delivers ±1.5% current matching and 5000:1 dimming resolution to eliminate visible brightness banding and enable high-dynamic-range (HDR) local dimming. |
Use Scenario: Implementing vertical or horizontal scan-based dimming where LED strings are activated sequentially rather than simultaneously. IC Role / Device Role / Timing Role: Six independent current sinks synchronized to scan timing signals; FAULT pin used for real-time string health monitoring. Use Value: Enables reduced peak current demand and lower thermal stress during partial-frame illumination, extending LED lifetime and simplifying thermal design. |
| Commercial Display Backlight | Medical Imaging Monitor Backlight |
|
Use Scenario: High-reliability backlight for digital signage, kiosks, and industrial displays operating 24/7 under ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Constant-current driver with thermal shutdown, OVP, and UVLO - ensuring fail-safe operation during extended runtime. Use Value: Maintains consistent luminance over time via tight current matching and built-in diagnostics, reducing field service incidents. |
Use Scenario: Precision backlight for diagnostic-grade medical monitors requiring grayscale fidelity, zero flicker, and deterministic fault response. IC Role / Device Role / Timing Role: Regulated current source with <200 ns minimum pulse width and 90 Hz–22 kHz PWM compatibility for artifact-free imaging. Use Value: Eliminates temporal artifacts during rapid image updates; FAULT pin integration supports IEC 62304-compliant safety monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61194PWPR | 4-string version (vs. 6-string); identical pinout except fewer IFB/PWM pins; same 400-mA per string rating and 120-V max output. | Targeted for smaller panels or cost-optimized designs with ≤4 LED strings; requires PCB redesign if upgrading from 4- to 6-string topology. | Select TPS61194PWPR only when system uses exactly four LED strings and board space/layout reuse is prioritized. |
| LM3409QMHX/NOPB | Single-string buck-boost LED driver; no integrated PWM dimming logic; requires external microcontroller for dimming control. | Suitable for simpler, lower-cost displays without local dimming; lacks per-string fault isolation and adaptive output voltage. | Choose LM3409QMHX/NOPB for non-zoned backlights where BOM cost outweighs feature density and diagnostic capability. |
Compared with TPS61196, TPS61194PWPR offers identical performance per string but halves channel count, while LM3409QMHX/NOPB shifts complexity to external control and sacrifices multi-string integration - making TPS61196 optimal for high-channel-count, diagnostics-aware LCD TV backlight systems.
Availability
TPS61196 is available at Aetrix Electronics and suitable for LCD TV backlight, scan-mode display, commercial signage, medical imaging monitor, and industrial embedded display applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS61196 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 display power solutions and automotive-grade reliability.
The TPS61196 belongs to TI's high-accuracy WLED driver product line, engineered specifically for multi-string LCD TV and professional display backlight systems demanding precision current regulation, independent dimming, and comprehensive fault protection.
FAQ
What is the maximum number of LED strings supported by the TPS61196?
The TPS61196 supports up to six independent LED strings, each with dedicated current regulation and PWM dimming input (PWM1–PWM6). Unused strings can be disabled by grounding their IFB pins through 20–36 kΩ resistors, and the device automatically detects and excludes them during startup - preserving efficiency and stability in 1–6 string configurations. This makes TPS61196 adaptable across panel sizes without hardware changes.
How does the TPS61196 achieve adaptive output voltage control?
The TPS61196 continuously monitors the six IFB pin voltages and regulates its boost output to match the highest forward voltage string plus the programmable headroom voltage set at the IFBV pin (0.3–1 V). This adaptive behavior minimizes power dissipation in the current sinks and improves overall system efficiency - especially critical in high-power LCD TV backlights where thermal management is constrained.
What protection features are integrated into the TPS61196?
The TPS61196 integrates overcurrent protection (via ISNS), output overvoltage protection (OVP), input undervoltage lockout (UVLO), thermal shutdown (150°C), LED open/short detection, Schottky diode open/short protection, ISET short-to-ground detection, and IFB short-to-ground sensing. All faults assert the open-drain FAULT pin, enabling system-level error logging or safe shutdown - essential for unattended operation in consumer and medical displays.
Can the TPS61196 operate with input voltages below 8 V?
No - the TPS61196 has a specified minimum input voltage of 8 V per its Recommended Operating Conditions. Attempting operation below this threshold risks failure to start or unstable regulation due to insufficient headroom for the internal LDO and gate driver circuitry. The UVLO pin allows raising the effective turn-on threshold, but cannot extend operation below the absolute 8 V minimum required for functional boost conversion.
What is the role of the REF pin in the TPS61196 soft-start sequence?
The REF pin serves as the timing node for the TPS61196's programmable soft-start function. An external capacitor (1–4.7 µF) is charged first at 200 µA, then at 10 µA after reaching 2 V; the boost converter and current sinks activate only once the REF voltage exceeds the OVP feedback voltage. This staged charging limits inrush current into output capacitors and prevents voltage overshoot - critical for reliable startup in high-capacitance LCD TV power stages.
TPS61196PWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 8V
- Voltage - Supply (Max):
- 30V
- Voltage - Output:
- 120V
- Current - Output / Channel:
- 400mA
- Frequency:
- 800kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-HTSSOP
TPS61196PWPR FAQ
1.How can I place an order for TPS61196PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61196PWPR 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 TPS61196PWPR reliable?
The price and inventory of TPS61196PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61196PWPR is usually 5 days.
3.What payment methods are accepted for TPS61196PWPR?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61196PWPR?
TPS61196PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61196PWPR 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 TPS61196PWPR?
For technical support, including TPS61196PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61196PWPR requirements.
6.How does Aetrix verify that TPS61196PWPR is sourced from the original manufacturer or authorized distributors?
All TPS61196PWPR 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 TPS61196PWPR meets industry standards.
7.What is the process for return or replacement of TPS61196PWPR?
All TPS61196PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TPS61196PWPR, 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 TPS61196PWPR part is unused and in its original packaging.
Return procedure for TPS61196PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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