英飞凌TLE8102SG汽车电源方案

英飞凌(Infineon)TLE8102SG是采用智能功率技术(SPT)的双路电流检测的低边侧电源开关,它有两个漏极开路的DMOS输出级.在PWM应用时,输出级直接由并行输入直接控制或有SPI来控制.所有的输出级都能提供负载电流正比检测信号. TLE8102SG在汽车电源应用时有嵌入的保护功能.本文介绍了TLE8102SG的主要特性, 方框图和诊断功能方框图,以及多种应用电路图.

TLE8102SG Smart Dual Channel Powertrain Switch coreFLEX
主要特性:
Overload Protection
DMOS Overtemperature protection
Open load detection
Current limitation
Low quiescent current mode
3.3 V μC compatible input
Electrostatic discharge (ESD) protection
Green Product (RoHS compliant)
AEC Qualified

概述:
Proportional load current sense with improved Precision:+/- 6% at ID=3A and +/-3% Current Sense Temperature Deviation refering to TJ=25°C
Two Low-Side Channels with RON (max. @ 150°C) = 360mOhm.
IC Overtemperature warning
8-Bit SPI (for diagnosis and control)
Short to GND detection
Programmable overload behaviour
Dual Current Sense Low-Side Switch in Smart Power Technology (SPT) with two open drain DMOS output stages. The TLE8102SG is protected by embedded protection functions and designed for automotive applications. The output stages can be controlled directly by parallel inputs for PWM applications (e.g. Oxygen Probe Heater) or by SPI. All output stages can provide a load current proportional sense signal. Diagnosis can be read from an 8-bit SPI or by the external fault pin.



图1. TLE8102SG方框图



图2. TLE8102SG诊断功能方框图




图3. TLE8102SG菊花连接图



图4. TLE8102SG状态输出方框图



图5. 采用SPI和电流检测输出的方框图



图6.采用SPI和故障标识的方框图




图7. 采用并行输入和状态输出的应用电路图(没有SPI)