1 Features

? AEC-Q100 qualified for automotive applications

– Grade 1: –40°C to 125°C ambient operating

temperature

– Device HBM classification level H1C

– Device CDM classification level C5

? Functional safety capable

– Documentation available to aid functional safety

system design

? 4.5V to 65V wide input voltage range

? Configurable constant voltage and constant

current operation

– Up to 2A continuous output current

– 4% regulation accuracy (voltage and current

mode)

? Adaptive on-time average current control

? Programmable switching frequency from 100kHz

to 1.2MHz

? Advanced dimming operation

– 10-bit precision analog dimming

– 10-bit precision internal PWM dimming

– Supports external PWM dimming input

– Optimized for external shunt dimming including

LED matrix manager

? Cycle-by-cycle switch overcurrent protection

? Switch thermal protection

? Serial Peripheral Interface (SPI)

– Configurable analog reference, switching

frequency, and PWM dimming duty cycle

– Fault monitoring and reporting

? Limp-home (LH) and standalone mode operation

2 Applications

Automotive headlight and adaptive LED driving

module

3 Description

The TPS92530-Q1 is a monolithic, 3-channel,

synchronous, buck LED driver with a wide 4.5V

to 65V operating input voltage range that can

independently power three strings of series connected

LEDs. The TPS92530-Q1 implements an adaptive ontime

average current mode control and is designed to

generate constant voltage or constant current output.

The adaptive on-time control provides near constant

switching frequency that can be set between 100kHz

and 1.2MHz. In constant current mode, the device

is compatible with shunt FET dimming techniques

and with LED matrix manager-based dynamic beam

headlamps. In constant voltage mode, the adaptive

on-time control enables high bandwidth operation

with fast transient response. Inductor current sensing

and closed-loop feedback enables better than ±4%

accuracy over wide input voltage, output voltage, and

ambient temperature range.

In constant current mode, the high performance LED

driver can independently modulate LED current using

both analog or PWM dimming techniques. Linear

analog dimming response with over 16:1 range is

obtained by programming the 10-bit reference value

(CHxREF) through SPI. PWM dimming of LED current

is achieved by directly modulating the corresponding

UDIM input pin with the desired duty cycle or by

enabling the internal PWM generator circuit. The

PWM generator translates the 10-bit PWM register

value to a corresponding duty cycle by comparing it to

a programmable digital counter.

The TPS92530-Q1 incorporates advanced SPI

programmable diagnostic and fault protection

featuring: cycle-by-cycle switch current limit, bootstrap

undervoltage, LED open, LED short, thermal warning

and thermal shutdown. An on-board 10-bit ADC

samples critical input parameters required for system

health monitoring and diagnostics.