原标题：TI TPS92630-Q1汽车尾灯参考设计TIDA-00677

　　TI公司的TPS92630-Q1组合了高VIN DC/DC降压转换器和高VIN低压降(LDO)稳压器,满足汽车AEC-Q100标准,输入电压3.6-V到36-V,最大负载电流3.2A,输出可调电压1.1V-20V,可调开关频率100-kHz到2.5-MHz,主要用在汽车娱乐系统,高档驾驶辅助系统(ADAS),汽车远程通信,eCALL,12V/24V工业和商业低功耗系统.本文介绍了TPS92630-Q1主要特性,框图和两种应用案例,以及CISPR 25汽车尾灯参考设计TIDA-00677主要特性,框图,电路图,材料清单和PCB设计图.

　　The TPS65321-Q1 device is a combination of a high-VIN DC-DC step-down converter, referred to as the buck regulator, with an adjustable switch-mode frequency from 100-kHz to 2.5-MHz, and a high-VIN 280-mA low-dropout (LDO) regulator. The input range is 3.6-V to 36-V for the buck regulator, and 3-V to 36-V for the LDO regulator. The buck regulator has an integrated high-side MOSFET and an active-low, open-drain power-good output-pin (nRST). The LDO regulator also has an integrated MOSFET and features a low-input supply current of 35-μA typical in no-load condition. The low-voltage tracking feature enables the TPS65321-Q1 device to track the input supply during cold-crank conditions.

　　The buck regulator provides a flexible design to fit system needs. The external loop compensation circuit allows for optimization of the converter response for the appropriate operating conditions. A low-ripple pulse-skip mode reduces the no-load input-supply current to maximum 140-μA.

　　The device has built-in protection features such as soft start, current-limit, thermal sensing, and shutdown because of excessive power dissipation. Furthermore, the device has an internal undervoltage-lockout (UVLO) function that turns off the device when the supply voltage is too low.

　　TPS92630-Q1主要特性:

　　Qualified for Automotive Applications

　　AEC-Q100 Qualified with the Following Results:

　　Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature

　　Device HBM ESD Classification Level 2

　　Device CDM ESD Classification Level C4B

　　One High-VIN Step-Down DC-DC Converter

　　Input Range of 3.6-V to 36-V

　　250-mΩ High-Side MOSFET

　　Maximum Load Current 3.2-A, Output Adjustable 1.1-V to 20-V

　　Adjustable Switch-Mode Frequency 100-kHz to 2.5-MHz

　　Synchronizes to External Clock

　　Maximum 140-μA Operating Quiescent Current

　　High Efficiency at Light Loads With Pulse-Skipping Eco-mode Control Scheme

　　Reset Output-Pin (Active Low, Open-Drain)

　　One High-VIN Low-Dropout (LDO) Voltage Regulator

　　Input Range of 3-V to 36-V

　　280-mA Current Capability With Typical 35-µA Operating Quiescent Current in No-Load Condition

　　Low-Dropout Voltage of 300-mV atIO = 200-mA (Typical)

　　Overcurrent Protection for Both Regulators

　　Overtemperature Protection

　　14-Pin HTSSOP Package WithPowerPAD Integrated Circuit Package

　　TPS92630-Q1应用:

　　• Automotive Infotainment and Cluster

　　• Advanced Driver Assistance System (ADAS)

　　• Automotive Telematics, eCall

　　• 12-V and 24-V Industrial and Commercial Low Power System

　　图1.TPS92630-Q1功能框图

　　图2.TPS92630-Q1设计案例:开关频率2.2MHz

　　图3.TPS92630-Q1设计案例:开关频率500kHz

　　CISPR 25尾灯参考设计TIDA-00677

　　The TIDA-00677 TI design is showcasing a solution for an automotive LED tail light application (Tail/Stop, Turn, Reverse) by using the TPS92630-Q1 linear LED driver supplied by an upstream buck converter (TPS65321-Q1) which is directly supplied through a smart reverse battery diode off the automotive battery voltage. The design has also been subjected to EMI/EMC radiation and pulse tests according to CISPR25 and ISO 7637-2. More information regarding potential cost savings and efficiency (power dissipation, system thermals) can be found in the user guide. For a similar design driven by Boost Converter, please see the TIDA-00678. For a similar design driven directly from car battery, please see the TIDA-00679.directly supplied through a smart reverse battery diode off the automotive battery voltage. The design has also been subjected to EMI/EMC radiation and pulse tests according to CISPR25 and ISO 7637-2. More information regarding potential cost savings and efficiency (power dissipation, system thermals) can be found in the user guide. For a similar design driven by Boost Converter, please see the TIDA-00678. For a similar design driven directly from car battery, please see the TIDA-00679.

　　CISPR 25尾灯参考设计TIDA-00677主要特性:

　　Efficiency-optimized design

　　CISPR-25 tested EMI/EMC

　　Stays out of AM band

　　Load dump tolerant

　　Smart reverse battery protection

　　CISPR 25尾灯参考设计TIDA-00677应用:

　　• Automotive Tail Light

　　• Automotive Front Lighting

　　• Automotive Interior Lighting

　　图4.CISPR 25尾灯参考设计TIDA-00677外形图

　　图5.TPS92630-Q1降压和线性驱动器框图

　　图6.CISPR 25尾灯系统驱动器框图

　　LED模块系统指标:

　　CISPR 25尾灯参考设计TIDA-00677材料清单:

　　详情请见:

tidrlz0.pdf

tidrlz2.pdf

tps65321-q1.pdf