Texas Instruments TPS61199NSR

Overview

TPS61199 from Texas Instruments is a high-power current-mode boost controller IC for LCD backlight LED string driving, supporting 8–30 V input, adaptive 60 V boost output, up to eight parallel LED strings at 70 mA each with 3% current matching, and 5000:1 PWM dimming at 200 Hz - used in large-panel monitor and TV backlight systems.

For engineers reviewing the TPS61199 datasheet, TPS61199 pinout, TPS61199 application, or TPS61199 equivalent, key selection concerns include programmable switching frequency (300–800 kHz), integrated MOSFET gate driver (GDRV), eight independent IFB current-sink inputs, adaptive output voltage regulation, and comprehensive protection including ISNS-based overcurrent, OVP-clamped overvoltage, and FBP-programmable LED short detection.

Technical Context

The TPS61199 implements a current-mode PWM boost topology with external MOSFET control via GDRV, where output voltage is dynamically adjusted to match the highest forward-voltage LED string plus minimum IFB headroom - minimizing power loss. Its error amplifier drives COMP, requiring external RC compensation for loop stability.

It integrates eight matched current sinks (IFB1–IFB8) with ±2% regulation accuracy and 3% inter-string matching, each sinking up to 70 mA. Protection logic monitors ISNS (160 mV threshold), OVP (2.95 V clamp), FBP (programmable LED short threshold), and IFB pins for open/overvoltage faults, triggering shutdown or string disable without affecting remaining channels.

Key Specifications

Pinout & Package

TPS61199 is available in two thermally enhanced packages: 20-pin SO (12.6 mm × 5.3 mm) and 20-pin HTSSOP with PowerPAD™ (6.5 mm × 4.4 mm). The PowerPAD must be soldered to ground with thermal vias for reliable 150°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED backlight controller applications.

Compared with TPS61199, TPS61194 offers footprint and BOM reduction for 4-string designs but sacrifices scalability; LM3410X requires external circuitry to emulate multi-string functionality and lacks adaptive voltage control - making TPS61199 the only solution meeting full-spec large-panel backlight requirements out-of-the-box.

Availability

TPS61199 is available at Aetrix Electronics and suitable for LCD monitor backlighting, LCD TV backlighting, and industrial display lighting requiring stable component supply, long-term manufacturability, and automotive-grade reliability validation.

Supply support for TPS61199 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 leadership in display power solutions.

The TPS61199 belongs to TI's high-performance LED backlight controller product line, engineered specifically for large-format LCD TVs and monitors demanding precision current matching, adaptive voltage regulation, and robust fault protection.

FAQ

What is the maximum number of LED strings supported by the TPS61199?

The TPS61199 supports up to eight parallel LED strings via its dedicated IFB1 through IFB8 pins. Each string is independently regulated to the same current set by the ISET resistor. Unused IFB pins must be tied to GND to disable their associated current sinks - a hardware-configured feature that avoids firmware overhead and ensures deterministic startup behavior in the TPS61199.

How does the TPS61199 achieve adaptive output voltage regulation?

The TPS61199 continuously monitors the voltage at all eight IFB pins and regulates the boost converter output to match the highest forward-voltage LED string plus the minimum required headroom (~450 mV) at that IFB pin. This is implemented via an internal feedback loop that references the OVP pin to the lowest IFB voltage among active strings - ensuring minimal excess voltage and maximizing efficiency without external microcontroller intervention in the TPS61199.

What external components are required to set the full-scale LED current in the TPS61199?

To set the full-scale LED current in the TPS61199, a single resistor (R6) is connected between the ISET pin and GND. Using the typical ISET voltage of 1.229 V and current-multiple KISET = 1990, a 40.2 kΩ resistor sets 70 mA per string. The formula is I_IFB(AVG) = (V_ISET / R_ISET) × K_ISET, where R_ISET is the ISET-to-GND resistor - no additional DACs, op-amps, or digital interfaces are needed in the TPS61199.

Can the TPS61199 operate with a 12 V input to drive a 60 V LED string?

Yes, the TPS61199 is explicitly designed for this use case: its 8–30 V input range and adaptive 60 V boost capability allow it to drive high-VF LED strings from common 12 V supply rails. In the provided typical application, VIN = 12 V powers eight strings totaling 60 V output with 60 mA total current. The device's current-mode control and 500–800 kHz switching (set by R7 = 160 kΩ) ensure stable regulation and low output ripple in the TPS61199.

What protection features are integrated into the TPS61199?

The TPS61199 integrates six hardware-based protections: (1) ISNS-based MOSFET overcurrent (160 mV threshold), (2) OVP-clamped output overvoltage (2.95 V on OVP pin), (3) FBP-programmable LED short-across detection, (4) IFB overvoltage shutdown (>29.5 V), (5) thermal shutdown at 150°C, and (6) UVLO on VIN (7 V threshold). All operate autonomously without software - critical for safety-critical backlight systems using the TPS61199.