Software
Firmware
TIDA-010043
Efficient, high-current, linear LED driver reference design for SpO2 and other medical applications
TIDA-010043
Overview
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.
Features
- 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)
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
Design files & products
Design files
Download ready-to-use system files to speed your design process.
TIDUEK8.PDF (6574 K)
Reference design overview and verified performance test data
TIDRZ89.PDF (347 K)
Detailed schematic diagram for design layout and components
TIDRZ90.PDF (29 K)
Complete listing of design components, reference designators, and manufacturers/part numbers
TIDRZ91.PDF (192 K)
Detailed overview of design layout for component placement
TIDRZ93.ZIP (1622 K)
Files used for 3D models or 2D drawings of IC components
TIDCFC6.ZIP (443 K)
Design file that contains information on physical board layer of design PCB
TIDRZ92.PDF (946 K)
PCB layer plot file used for generating PCB design layout
Products
Includes TI products in the design and potential alternatives.
MOSFETs
CSD13202Q2 — 12-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 9.3 mOhm
Data sheet: PDF | HTMLStart development
Technical documentation
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| Type | Title | Date | ||
|---|---|---|---|---|
| * | Design guide | Efficient, high current, linear LED driver reference design for SpO2 | Mar. 08, 2019 |
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