东沃电子(DOWOSEMI)代理的TMP1750芯片是一款具有模拟和 PWM 调光控制功能的三通道线性LED驱动器。该器件的全面诊断和内置保护功能使其成为可变强度 LED 照明(可达到中等功率范围)应用的理想之选。查看TMP1750芯片产品手册,可知:The design of this device suits it well for driving LEDs configured as a single string or multiple strings within its power capability. A single device can drive up to three strings with one to three LEDs in each string at a total current of up to 150 mA per channel. Outputs can be paralleled to provide higher current drive capability to 450 mA. In multiple-string applications, the device offers the advantage of having common-cathode connection of the LED strings. So, the application needs only a single return wire instead of one return wire per LED string that a system with low-side current sense would need. A single-LED-short comparator allows detection of single LED failing with a short circuit. Fault output can support bus connection topology between multiple devices. The included temperature monitor reduces the LED drive current if the device junction temperature exceeds a thermal threshold. One can program the temperature threshold through an external resistor. One can disable the thermal current-monitor feature by connecting the TEMP pin to ground. Output of the junction temperature as an analog voltage is available as a factory program option.
TMP1750三通道线性LED驱动器特点
• 符合汽车类应用的标准
• 具有符合 AEC-Q100标准的下列结果
– 器件温度 1 级:–40°C 至 125°C 的环境运行温度范围
– 器件 HBM ESD 分类等级 H2
– 件 CDM ESD 分类等级 C3B
• 3通道LED驱动器(具有模拟和PWM调光功能)
• 宽输入电压范围:5V - 28V
• 由基准电阻器设定的可调恒定输出电流
– 最大电流:每通道 150mA
– 最大电流:并联运行模式下为 450mA
• 使用多个IC或者单个IC的多个通道的并联输出,以实现更高电流
• 低压降电压
– 最大压降:电流为60mA时每通道400mV
– 最大压降:电流为150mA时每通道 0.9V
• 每个通道独立进行 PWM 调光
• 具有抗毛刺脉冲计时器的开路和短路LED检测
• 每条通道的LED灯串电压反馈,用于单个LED短路检测
• 针对单个LED短路故障的独立故障引脚
• 用于报告开路、短路和热关断故障的故障引脚,可通过一条总线并行连接最多 15 个器件
• 器件可适应慢输入电压 dV/dt(0.5V/分),而不会出现任何问题
• 运行结温范围:-40°C 至 150°C
• 封装:16引脚耐热增强型封装 (HTSSOP)
TMP1750三通道线性LED驱动器引脚配置说明
TMP1750三通道线性LED驱动器应用威廉希尔官方网站
汽车LED照明应用,比如:日间行车灯、驻车灯、雾灯、尾灯 、停车灯、室内照明灯。
细心的电子工程师对比参数后会发现,东沃电子(DOWOSEMI)代理的三通道线性LED驱动器TMP1750可替代替换品牌TI (德州仪器)TPS92630-Q1 (pin-to-pin HTSSOP-16)、TPS92610-Q1(当TMP1750三通道并联输出450mA应用时可以代替)、TPS92611-Q1(当TMP1750三通道并联输出450mA应用时可以代替)和Elmos品牌E522.80/81。
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