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Texas Instruments TPS61196PWPT
- Part No.:
- TPS61196PWPT
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS61196PWPT.pdf
- Description:
- IC LED DRVR CTRLR PWM 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:647
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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 - used in high-end LCD TV backlight systems requiring precise per-string brightness control.
For engineers reviewing the TPS61196 datasheet, TPS61196 pinout, TPS61196 application, or TPS61196 equivalent, this page delivers verified technical context, exact pin functions, real-world dimming resolution (up to 5000:1), OVP/UVLO/thermal protection behavior, and validated alternative WLED drivers for scan-mode and static backlight designs.
Technical Context
The TPS61196 integrates a current-mode boost controller with six independent current sinks, each regulated via feedback at its IFB pin, where minimum headroom voltage is programmable (0.3–1 V) to optimize efficiency across varying LED forward voltages. It uses adaptive output voltage control - dynamically adjusting VOUT to match the highest-string requirement plus IFBV-set headroom - 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. Protection includes ISET short-to-ground detection (150 µA threshold), IFB short-to-ground sensing, LED open/short detection, overvoltage (OVP pin, 3.02 V nominal), 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 supplies including 12 V and 24 V industrial/TV power rails. |
| Max Output Voltage | 120 V - sufficient for driving up to 36+ series-connected white LEDs at typical VF (~3.3 V). |
| Switching Frequency | 100–800 kHz - set by external resistor on FSW pin; enables EMI optimization and compact magnetics. |
| Per-String Current | 200 mA continuous / 400 mA pulsed - adjustable via ISET pin voltage (1.229 V typical) and IFBV programming. |
| Current Matching | ±1.5% between strings - ensures uniform luminance across multi-string LCD backlights without calibration. |
| PWM Dimming Resolution | Up to 5000:1 - achieved via high-frequency, low-jitter independent PWM inputs (90 Hz–22 kHz). |
| OVP Threshold | 2.95–3.09 V at OVP pin - sets output overvoltage protection at ~120 V using standard resistor divider. |
| UVLO Hysteresis | 300 mV - prevents oscillation during input brownout; threshold programmable via UVLO pin resistor divider. |
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 heat dissipation. Pin count and layout are optimized for multi-string LED routing and noise-sensitive analog feedback paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Main supply input (8–30 V); connects to bulk capacitor and inductor primary. |
| EN | Enable control | Logic-level enable (VIH = 1.8 V min); pulls device into shutdown when low (<0.8 V). |
| PWM1–PWM6 | Dedicated dimming inputs | Independent CMOS-compatible PWM signals per string; no internal clock dependency. |
| ISET | Current reference setting | Sets full-scale LED current via external voltage (1.229 V typical); short-to-ground protected. |
| IFB1–IFB6 | Current sink feedback | Analog sense inputs for each string's current regulator; support open/short detection. |
| IFBV | Minimum headroom voltage | Programs minimum voltage drop across current sinks (0.3–1 V range) to maximize efficiency. |
| FSW | Frequency programming | Resistor-connected pin sets switching frequency (100–800 kHz); disables clock if >3.5 V or <0.5 V. |
| FAULT | Fault indicator | Open-drain output asserting low during UVLO, OVP, thermal shutdown, or LED fault conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Independent per-string PWM dimming | Enables localized dimming zones in LCD TVs without cross-talk or timing skew between strings. |
| Adaptive boost output voltage | Automatically tracks highest-string forward voltage + IFBV headroom - reduces conduction loss by up to 15% vs fixed-output designs. |
| Built-in IFB short-to-ground protection | Detects IFB pin shorted to ground (e.g., PCB solder bridge) and asserts FAULT before damaging current sink. |
| Programmable soft-start time | Set via external capacitor on REF pin (1–4.7 µF); eliminates inrush current and stabilizes startup under variable load. |
| Unused string disable logic | Auto-detects grounded IFB pins (via 60 µA current source) and excludes unused strings from regulation loop - avoids false fault triggers. |
| Integrated linear regulator (VDD) | Generates stable 6 V internal supply from VIN; powers analog/compensation circuitry without external LDO. |
Applications
| Scan Mode LCD TV Backlight | LCD TV Local Dimming System |
|---|---|
|
Use Scenario: Driving segmented LED arrays synchronized with vertical scan lines to reduce motion blur and improve contrast. IC Role / Device Role / Timing Role: TPS61196 acts as per-zone current controller, accepting timed PWM signals aligned to video frame scan rate. Use Value: Enables dynamic local dimming with <100 µs response per zone, leveraging independent PWM1–PWM6 for precise temporal alignment. |
Use Scenario: Powering high-brightness edge-lit or direct-lit LCD panels with >1000 nits peak luminance and HDR compliance. IC Role / Device Role / Timing Role: TPS61196 serves as primary WLED current source with adaptive VOUT and 120 V capability for long LED strings. Use Value: Delivers ±1.5% current matching across 6 strings - critical for uniform luminance in premium TV panels with minimal post-calibration. |
| Industrial Display Backlight | Medical Imaging Monitor Backlight |
|
Use Scenario: Backlighting ruggedized displays in factory HMIs or outdoor kiosks requiring extended temperature operation and reliability. IC Role / Device Role / Timing Role: TPS61196 provides robust current regulation with thermal shutdown (150°C), UVLO hysteresis, and fault reporting via FAULT pin. Use Value: Maintains stable LED output from –40°C to +85°C ambient, with built-in protections eliminating need for external supervision circuitry. |
Use Scenario: Driving diagnostic-grade grayscale monitors where luminance stability and flicker-free dimming are clinically mandated. IC Role / Device Role / Timing Role: TPS61196 operates in high-resolution PWM mode (5000:1) with <22 kHz dimming frequency to eliminate perceptible flicker. Use Value: Achieves flicker-free dimming down to 0.02% duty cycle - meeting DICOM GSDF luminance stability requirements for medical imaging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61194RGTT | 5-string version (vs 6-string); identical pinout except missing PWM6/IFB6; same 400-mA per string rating and 120-V OVP. | Used where only five LED strings are required - reduces BOM cost but requires PCB redesign if sixth string added later. | Select when system design uses ≤5 strings and board space allows RGTT (QFN-20) instead of PWP (HTSSOP-28). |
| LM3409QMH/NOPB | Single-channel, high-side buck-boost LED controller; no integrated current sinks or PWM dimming logic; requires external MOSFETs and gate drivers. | Targeted at custom high-power LED arrays with flexible topology - lacks per-string dimming and matching accuracy of TPS61196. | Choose for non-standard topologies (e.g., SEPIC, flyback) or when discrete control and thermal management are prioritized over integration. |
Compared with TPS61194RGTT and LM3409QMH/NOPB, the TPS61196 uniquely combines six independent PWM-controlled current sinks, adaptive boost, and ±1.5% matching in one HTSSOP package - making it optimal for production-ready LCD TV backlight modules requiring zero-layout changes for 6-string configurations.
Availability
TPS61196 is available at Aetrix Electronics and suitable for LCD TV backlight, scan-mode display, industrial HMI, medical imaging monitor, and high-reliability embedded lighting applications requiring stable component supply and long-term manufacturability.
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 LED driver architecture and automotive-grade reliability.
The TPS61196 belongs to TI's high-performance WLED driver product line, engineered specifically for large-format LCD TV backlight systems demanding independent per-string dimming, adaptive voltage control, and comprehensive fault protection.
FAQ
What is the maximum number of LEDs the TPS61196 can drive per string?
The TPS61196 supports up to 120 V output voltage. Assuming a typical white LED forward voltage of 3.3 V, it can drive up to 36 LEDs in series per string while maintaining regulation margin. The actual count depends on total string VF, input voltage, and minimum headroom set by IFBV - which is programmable from 0.3 V to 1 V. TPS61196 datasheet Figure 5 confirms minimum headroom remains below 1 V across full current range.
How does the TPS61196 achieve ±1.5% current matching between strings?
The TPS61196 achieves ±1.5% current matching through matched internal current mirror circuitry and precision bandgap references shared across all six current sinks. Electrical Characteristics table specifies KIFB(M) = 1.5% max matching error at IISET = 32.56 µA and VIFB = 0.5 V. Layout symmetry and thermal coupling on the die further minimize drift - confirmed in TPS61196 datasheet Section 6.5.
Can the TPS61196 operate with PWM dimming frequencies below 90 Hz?
No - the TPS61196 is specified for PWM dimming frequencies from 90 Hz to 22 kHz only. Operation below 90 Hz risks visible flicker and violates the device's functional specification. Datasheet Section 1 states "PWM frequency ranges from 90 Hz to 22 kHz", and Figure 1 shows measurable nonlinearity below 90 Hz. For sub-90 Hz applications, external dimming control or alternative drivers must be used.
What protection features are integrated into the TPS61196?
The TPS61196 integrates overcurrent protection (VISNS(OC) = 400 mV threshold), output short-circuit protection, ISET short-to-ground detection (150 µA trip), IFB short-to-ground sensing, LED open/short detection, diode open/short protection, programmable OVP (2.95–3.09 V), UVLO with hysteresis (300 mV), and thermal shutdown at 150°C. All are documented in Sections 1 and 7.3 of the TPS61196 datasheet.
Is the TPS61196 pin-compatible with other devices in the TPS6119x family?
The TPS61196 is not pin-compatible with TPS61193/TPS61194 due to differing pin counts and functions: TPS61196 uses 28-pin HTSSOP with six PWM/IFB pairs, while TPS61194 uses 20-pin QFN with five channels. Pin Configuration table in TPS61196 datasheet explicitly lists unique assignments for PWM6, IFB6, and FBP - confirming no mechanical or electrical pin compatibility exists across the family.
TPS61196PWPT 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
TPS61196PWPT FAQ
1.How can I place an order for TPS61196PWPT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61196PWPT 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 TPS61196PWPT reliable?
The price and inventory of TPS61196PWPT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61196PWPT is usually 5 days.
3.What payment methods are accepted for TPS61196PWPT?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61196PWPT?
TPS61196PWPT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61196PWPT 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 TPS61196PWPT?
For technical support, including TPS61196PWPT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61196PWPT requirements.
6.How does Aetrix verify that TPS61196PWPT is sourced from the original manufacturer or authorized distributors?
All TPS61196PWPT 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 TPS61196PWPT meets industry standards.
7.What is the process for return or replacement of TPS61196PWPT?
All TPS61196PWPT units undergo pre-shipment inspection (PSI). If there is an issue with TPS61196PWPT, 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 TPS61196PWPT part is unused and in its original packaging.
Return procedure for TPS61196PWPT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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