适用于 SpO2 和其他医疗应用的高效、高电流、线性 LED 驱动器参考设计
TIDA-010043
此产品已上市，且可供购买。 可提供某些产品的较新替代品。
此产品已上市，且可供购买。 可提供某些产品的较新替代品。
请参阅相关参考设计和其他 TI 资源的重要声明和免责声明
描述
This reference design provides a protected, efficient (headroom-controlled), high-current (up to 1.5 A), linear (accurate and fast) light-emitting diode (LED) driver reference design to enable peripheral capillary oxygen saturation (SpO2) and other medical applications. A typical SpO2 application drives current through LEDs. Most of these drivers are integrated with analog front-end devices and work at the typical value of 100 mA. A higher current drive is necessitated to cover wide range of human and veterinary physiology. This design enables self-calibration and uses a look-up table for headroom control to optimally drive LEDs resulting in minimum power dissipation across the control element. The design operated from an input voltage range of 1.8 V to 4.2V and enables LED currents up to 1.5 A.
特性
- Higher efficiency by providing headroom control to optimally drive LED:
- - Built-in self-calibration and look-up table for headroom control
- Dynamic adjustment of the LED supply voltage, to achieve optimal efficiency at the programmed current levels
- Diagnostics (LED open, LED short, LED disconnect) and protection mechanism for fault by disconnecting the supply using e-fuse
- Wide operating input range from 1.8 V to 5.5 V to support all battery type inputs
- Programmable range selection for LED current (from 100 mA to 1.5 A)
- Compatible with AFE44xx series EVMs (tested with AFE4403 EVM) for driving LEDs
- Tested with MSP430G2553 LaunchPad™ and two on-board LEDs (green and red)
请参阅相关参考设计和其他 TI 资源的重要声明和免责声明
