Low Voltage IR LED Driver Reference Design for Photoelectric Measurement Subsystems TIDA-010014 (ACTIVE)

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Key Document

Description

This reference design provides a design example for an IR LED driver for photoelectric measurement subsystems.  The subsystem described includes a voltage-to-current converter based on an operational amplifier (op amp) and a MOSFET transistor for the active pass device to form the basis of an accurate and programmable current sink function.  The use of the MOSFET transistor in this circuit allows several advantages which will be described and, most importantly, the opportunity to provide good current regulation in low-voltage, battery-powered systems.  Similarly, the high input impedance and the high open loop gain of the op amp in feedback allows the circuit to achieve a flat response over temperature and minimal variation in output current due to changes in supply voltage.

Features
  • Low voltage operation for 3V battery application
  • Fast enable time with minimal overshoot for minimizing LED "On" time
  • Low "Off" state supply current
  • Wide and linear output current adjustment range
  • Small footprint

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Design Guide

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TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD17483F4  30V, N ch NexFET MOSFET™, single LGA 1.0 x 0.6mm, 260mOhm  MOSFETs  Sample & Buy Not Available
TLV9002  2-Channel, 1MHz, RRIO, 1.8V to 5.5V Operational Amplifier for Cost-Optimized Systems  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TLV9062  10-MHz, low-noise, RRIO, CMOS operational amplifier for cost-sensitive systems   Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
TLV9002 Download Download
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TLV9062 Download Download
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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 674 17 Aug 2018
Design files (2)
Title Type Size (KB) Date
PDF 95 17 Aug 2018
PDF 20 17 Aug 2018
Related Tools & Software

Development Tools (1)

Name Part Number Tool Type
SPICE-based analog simulation program  TINA-TI  Circuit Design & Simulation 

Models (1)

Title Category Type Size (KB) Date Views
TIDA-010014 Simulation Files (Rev. A) TINA-TI Reference Design ZIP 245 KB 04 Oct 2018

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