TI LED171596A 96个LED阵列驱动方案

TI公司的LED171596A是用于RGB和白光LED的96个(24x4) LED阵列驱动器,具有单独的通路控制,支持4个低电阻高边开关和24个低边电流沉,每路可提供多达15mA的连续电流,电流匹配度±5%,I2C,SPI和PWM亮度控制模式,具有扩展的保护功能如开路和短路LED故障检测和热关断保护.主要用在控制面板照明和局部地区调光LED背景光驱动器.本文介绍了LED171596A主要特性,功能框图和应用电路,亮度通路图以及评估板LED171596A EVM特性,电路图,材料清单和PCB设计图.
LED171596A 96-LED Matrix Driver for RGB and White LEDs.The LED171596A is a 96 channel matrix LED driverwith independent channel control, designed fordriving locally dimmed displays. The device sports 4low-resistance high side switches and 24 low side current sinks that can deliver up to 15 mA ofcontinuous current per channel. The driver has 9-bitduty cycle and 8-bit current control of each low-sideLED current sink.
Each current sink can be individually controlledthrough the I2C-compatible or SPI interface, but alsohas the capability to be controlled with a single valuethrough the global brightness control register. Thisglobal brightness control also passes through abrightness sloper function to create optically smoothbrightness transitions without the need for multipleregister writes.
The LED171596A is a LED driver that can individually control up to 96 LEDs. To control the 96 LEDs in a 4 × 24matrix the device uses four high-side PMOS switches and 24 low-side programmable current sinks. Each of thelow-side current sinks has independent 9-bit duty cycle and 8-bit current control. The individually duty and currentvalues can be controlled through the SPI or I2C-compatible interfaces.
The four high-side switches allow the LED171596A to time multiplex four groups of 24 LEDs. Maximum peakcurrent is set with ISET (with 60 mA maximum), but the maximum average current delivered to each LED is 15mA (ILED_MAX /4).
The individual LED brightness is internally multiplied with a global brightness register value. This allows thecontrol of all the LEDs at once with ...