IS32LT3124数据手册集成电路（IC）的LED驱动器规格书PDF

描述 Description

The IS32LT3124 is a linear programmable current regulator consisting of 4 output channels capable of up to 150mA each. Individual external resistors set the maximum current level for each channel. The outputs can be combined to provide a higher current drive capability up to 600mA (Max.).

The IS32LT3124 features Dynamic Headroom Control (DHC) with an optional external PMOS FET to minimize IC thermal stress when the supply voltage exceeds the LED string forward voltage. It includes two modes for different output power: Shunt Regulator mode and Series Regulator mode. It can operate with power supply modulation (PSM) for applications requiring dimming without use of the EN pin.

For added system reliability, the IS32LT3124 integrates fault detection circuitry for open/short circuit and over temperature conditions. The fault pins (FLTB) can all be tied together to disable the device and other IS32LT3124 devices on the same parallel circuit.

To handle all these different fault detection and reporting features, the IS32LT3124 has six different versions: A, B, C, D, E and F. All of them can support the above features. See table 1 for the major difference. In IS32LT3124A/B/D/E, if any fault condition occurs, all output currents will be disabled. In IS32LT3124B/C/E/F, individual ISET pin for each LED channel is redefined as individual PWM dimming control, thus ISET open detection function is removed. The EN pin of IS32LT3124B/C/E/F is featured as the enable signal of the internal fault reporting block. See Table 4 for complete fault listing.

The IS32LT3124 is targeted at the automotive market such as interior accent lighting and exterior tail lighting. It is offered in a thermally enhanced eTSSOP-16 package.

特性 Features

• 5.0V to 28V input supply voltage range ▪ Withstand 42V load dump
• Four output channels can source up to 150mA each ▪ Four current set resistors ▪ ±5% output current accuracy ▪ Low dropout voltage of 1V (Max.) at 100mA ▪ Combined for higher current capability with same current accuracy
• PWM dimming and shutdown control input ▪ 100Hz~300Hz power supply modulation (PSM) ▪ 100Hz~1kHz individual dimming via resistors of ISETx pins (IS32LT3124B/C/E/F only)
• Optional Dynamic Headroom Control (DHC) with an external PMOS FET to minimize IC thermal stress ▪ Shunt regulator mode for heavy load ▪ Series regulator mode for light load
• Additional external UVLO (Under Voltage Lockout Threshold) is programmable via EN pin (IS32LT3124A/D only)
• Fault protection and reporting ▪ Externally enable/disable fault reporting (IS32LT3124B/C/E/F only) ▪ Programmable fault reporting output delay time ▪ Fault condition disables all output (IS32LT3124A/B/D/E only) ▪ Parallel fault connection (one-fail-all-fail) ▪ LED string open/short ▪ Single LED short (Conditional, IS32LT3124B/C/D only) ▪ ISET pin short ▪ ISET pin open (IS32LT3124A/D only) ▪ Over temperature
• AEC-Q100 Qualified
• Operating temperature range (-40°C ~ +125°C)

应用 Application

• Automotive LED driver
• RGBW automotive ambient lighting
• Tail light
• Turn light
• Daytime running light

简介

IS32LT3124属于集成电路（IC）的LED驱动器。由制造生产的IS32LT3124LED 驱动器器件属于 LED 驱动器电源管理集成电路 (PMIC) 系列，可通过标称固定电压的电源为负载（通常为发光二极管）提供电流，并且电流可控。它与用于电压调节的类似产品的主要区别在于，这类器件提供较低的反馈电压（以提高系统能效），而且通常可对器件工作点进行外部控制，可在照明应用中用于实现调光功能。