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[原创] ST LED1202 12路低静态电流LED驱动解决方案

关键词:电源管理 LED驱动器 RGB LED 可穿戴 LED1202

时间:2019-04-26 11:02:12       来源:中电网

ST公司的LED1202是12路低静态电流LED驱动器,保证了5V输出驱动功能,而每路能提供高达20 mA和电压裕度仅为350mV.每路的输出电流由8位模拟和12位数字调光控制来单独调整.慢开时间和慢关时间提高了系统的低噪音性能,而移相功能有助于降低浪涌电流,八种模式存储在内部寄存器而不需要MCU干预进行自动定序.器件的1.8V兼容的I²C接口基于快速模式指标,工作高达400kHz.工作电压2.6V-5V,每路的电流能力20mA,16mA时的12路的电流匹配度1%,2.5mA时的匹配度2%,8位模拟调光单独控制,12位本地PWM分辨率.LED1202具有LED开路检测和超温保护.主要用在RGB照明如可穿戴电子学,电池供电设备和手持附件.本文介绍了LED1202主要特性,框图和驱动器电路框图,以及评估板STEVAL-LLL007V1主要特性,电路图和材料清单.

The LED1202 is a 12-channel low quiescent current LED driver; it guarantees 5 V output driving capability and each channel is able to provide up to 20 mA with a headroom voltage of 350 mV (typ.) only. The output current can be adjusted separately for each channel by 8-bit analog and 12-bit digital dimming control.

A slow turn-on and turn-off time improves the system low noise generation performance; moreover, the phase shifting function helps to reduce the inrush current. Eight patterns can be stored in the internal registers for automatic sequencing without MCU intervention.
The pattern sequence can be also configured for duration time and number of repetition. For multi-device applications, a common clock domain can be shared for timing synchronization. The device includes the..

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