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TPS92691, TPS92691-Q1

SLVSD68 – DECEMBER 2015

TPS92691/-Q1 Multi-Topology LED Driver With Rail-to-Rail Current Sense Amplifier

1 Features

3 Description

The TPS92691/-Q1 is a versatile LED controller that

1

•

Wide Input Voltage: 4.5 V to 65 V

can support a range of step-up or step-down driver

•

Wide Output Voltage Range: 2 V to 65 V

topologies. The device implements a fixed-frequency

•

Low Input Offset Rail-to-Rail Current Sense

peak

current

mode

control

technique

with

Amplifier

programmable

switching

frequency,

slope

compensation, and soft-start timing. It incorporates a

–

Better than ±3% LED Current Accuracy over

high voltage (65-V) rail-to-rail current sense amplifier

25°C to 140°C Junction Temperature Range

that can directly measure LED current using either a

–

Compatible With High-Side and Low-Side

high-side or a low-side series sense resistor. The

Current Sense Implementations

amplifier is designed to achieve low input offset

voltage and attain better than ±3% LED current

•

High-Impedance Analog LED Current Adjust Input

accuracy over junction temperature range of 25°C to

(IADJ) With over 15:1 Contrast Ratio

140°C and output common-mode voltage range of 0

•

Over 1000:1 Series FET PWM Dimming Ratio

to 60 V.

With Integrated Series N-Channel Dim Driver

LED current can be independently modulated using

Interface

either analog or PWM dimming techniques. Linear

•

Continuous LED Current Monitor Output for

analog dimming response with 15:1 range is obtained

System Fault Detection and Diagnoses

by varying the voltage from 140 mV to 2.25 V across

•

Programmable Switching Frequency With External

the high impedance analog adjust (IADJ) input. PWM

Clock Synchronization Capability

dimming of LED current is achieved by modulating

the PWM input pin with the desired duty cycle and

•

Programmable Soft-Start and Slope

frequency. Optional DDRV gate driver output can be

Compensation

used to enable series FET dimming functionality to

•

Comprehensive Fault Protection Circuitry

get over 1000:1 contrast ratio.

Including VCC Undervoltage Lockout (UVLO),

The TPS92691/-Q1 supports continuous LED status

Output Overvoltage Protection (OVP), Cycle-by-

check through the current monitor (IMON) output.

Cycle Switch Current Limit, and Thermal

This allows for LED short circuit or open circuit

Protection

detection and protection. Additional fault protection

•

TPS92691-Q1: Automotive Q100 Grade 1

features include VCC UVLO, output OVP, switch

Qualified

cycle-by-cycle current limit, and thermal protection.

2 Applications

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

•

TPS92691-Q1: Automotive Exterior Lighting

TPS92691-Q1

Applications

HTSSOP (16)

5.10 mm × 6.60 mm

TPS92691

•

Architectural and General Lighting Applications

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Boost LED Driver Application Schematic

Efficiency vs Output Voltage

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.