Texas Instruments TPS92518HVPWPR

Overview

TPS92518HVPWPR from Texas Instruments is a dual-channel high-voltage buck LED controller with SPI interface, quasi-hysteretic control, and independent analog/PWM dimming per channel. It supports 6.5 V to 65 V input, delivers up to 425 mA per channel, and enables 10,000:1 PWM dimming for adaptive LED matrix headlamps and color-mixing lighting systems.

For engineers reviewing the TPS92518HVPWPR datasheet, TPS92518HVPWPR pinout, TPS92518HVPWPR application, or TPS92518HVPWPR equivalent, this page provides verified package mapping (HTSSOP-24), confirmed dual-buck topology, validated SPI register programmability (peak current, off-time, VLED sense), and real-world thermal shutdown behavior at 175°C junction temperature.

Technical Context

The TPS92518HVPWPR implements quasi-hysteretic peak-current control with digitally programmable 8-bit DACs for peak current threshold (255-step, 10 mV to 265 mV), controlled off-time (255-step, 3.2–4.8 µs at 30 V), and maximum off-time (255-step, up to 65 µs). Each channel features independent high-side differential current sensing (CSPx/CSNx), cycle-by-cycle current limiting, and dedicated gate drivers with 7.3 Ω PFET / 2.8 Ω NFET R_DS(on).

Its SPI interface supports full-duplex communication (MOSI/MISO/SCK/SSN) with 500 ns SCK period, 250 ns MOSI setup time, and fault reporting via register reads. The device operates across –40°C to +125°C ambient, with thermal shutdown at 175°C and hysteresis of 10°C.

Key Specifications

Pinout & Package

TPS92518HVPWPR is housed in a thermally enhanced 24-pin HTSSOP package (7.7 mm × 4.4 mm, 0.65 mm pitch) with exposed thermal pad connected to GND for optimal power dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel LED controller applications.

Compared with TPS92518HVPWPR, the TPS92518PWPR offers identical functionality at lower voltage stress but sacrifices 65 V robustness, while the LM3423MH/NOPB reduces system complexity at the cost of digital control, diagnostics, and dual-channel integration-making TPS92518HVPWPR optimal for programmable, high-reliability, multi-string LED systems.

Availability

TPS92518HVPWPR is available at Aetrix Electronics and suitable for automotive adaptive headlamps, architectural color-mixing fixtures, and high-brightness projector light engines requiring stable component supply across extended temperature and voltage ranges.

Supply support for TPS92518HVPWPR 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 automotive and industrial power conversion.

The TPS92518HVPWPR belongs to TI's high-voltage LED controller product line, engineered specifically for adaptive lighting systems demanding precision dimming, thermal resilience, and SPI-based system-level integration in safety-critical environments.

FAQ

What is the maximum input voltage supported by the TPS92518HVPWPR?

The TPS92518HVPWPR supports an absolute maximum input voltage of 67 V and a recommended operating range of 6.5 V to 65 V. This high-voltage capability enables direct connection to 48 V industrial buses and automotive systems subject to load-dump transients, unlike the standard TPS92518PWPR rated for 44 V max. Operation within the 6.5–65 V window ensures reliable quasi-hysteretic control and thermal stability across all specified ambient temperatures.

How does the TPS92518HVPWPR achieve 10,000:1 PWM dimming?

The TPS92518HVPWPR achieves 10,000:1 PWM dimming through dedicated PWM1 and PWM2 inputs that directly modulate gate drive timing without external circuitry. Its internal logic synchronizes PWM edges with the quasi-hysteretic switching cycle, enabling precise sub-microsecond pulse placement. Combined with low-jitter gate drivers (68–105 ns PWM delay) and cycle-by-cycle current limiting, this architecture maintains LED current accuracy even at 0.01% duty cycles required for adaptive driving beam systems.

Can the TPS92518HVPWPR operate without SPI configuration?

Yes-the TPS92518HVPWPR can operate without SPI initialization by applying >23.6 V to the EN/UV pin, which bypasses SPI communication and loads factory-default register values (e.g., LEDx_PKTH_DAC = 127, LEDx_TOFF_DAC = 128). This mode supports immediate operation in simple applications, though full utilization of 10,000:1 dimming, fault reporting, and thermal monitoring requires SPI configuration. Default settings provide functional buck regulation but lack application-specific calibration.

What thermal management is required for continuous 425 mA/channel operation?

For continuous 425 mA/channel operation at 65 V_IN and 25 V_LED, the TPS92518HVPWPR requires PCB-level thermal design with the exposed thermal pad soldered to a minimum 200 mm² copper pour connected via ≥6 thermal vias (0.3 mm diameter) to inner ground planes. With this layout, the measured R_θJA of 32.5°C/W limits junction temperature rise to ~55°C above ambient at 125°C max ambient, staying well below the 150°C operating limit and 175°C shutdown threshold.

How does the controlled off-time scale with output voltage in the TPS92518HVPWPR?

The TPS92518HVPWPR's controlled off-time scales inversely with VLEDx to maintain constant peak-to-peak inductor ripple (ΔI_L-PP). When VLEDx = 30 V and LEDx_TOFF_DAC = 255, t_OFF = 4.1 µs; if VLEDx drops to 15 V, t_OFF increases to ~8.2 µs, and if VLEDx rises to 60 V, t_OFF decreases to ~2.05 µs. This µs·V relationship ensures stable current regulation across LED string voltage variations caused by temperature, aging, or binning-without requiring loop compensation.