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reference designOPA365AIDBVR | Demoboard TIDA-010043

Texas Instruments OPA365AIDBVR | Demoboard TIDA-010043

Efficient, high-current, linear LED driver reference design for SpO2 and other medical applications

Overview

TopologyOther Topology
IC revisionE2

Description

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 tooptimally 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 currents (from 100 mA to 1.5 A)
  • Compatible with AFE44xx series EVMs (tested with AFE4403 EVM) for driving LEDs
  • Tested with MSP430G2553 LaunchPad™ and twoon-board LEDs (green and red)

Typical applications

  • Process Control
  • Signal Conditioning / Data Acquisition

More information

Products

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
C
Tol. C
VR(V (DC))
Size
Operating Temperature
DF(%)
RISO
Ceramic Type
L(mm)
W(mm)
H(mm)
Fl(mm)
Packaging
Pins
Type
Mount
IR(A)
Working Voltage(V (AC))
SamplesAvailability & Sample
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885012205037
SPECWCAP-CSGP MLCCs 16 V(DC), 100 nF, ±10%
Simu­lation
Availability
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Downloads7 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWCAP-CSGP MLCCs 16 V(DC)
Capacitance100 nF
Capacitance±10% 
Rated Voltage16 V (DC)
Size0402 
Operating Temperature -55 °C up to +125 °C
Dissipation Factor5 %
Insulation Resistance5 GΩ
Ceramic TypeX7R Class II 
Length1 mm
Width0.5 mm
Height0.5 mm
Pad Dimension0.25 mm
Packaging7" Tape & Reel 
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885012207026
SPECWCAP-CSGP MLCCs 10 V(DC), 10 µF, ±10%
Simu­lation
Availability
–
Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWCAP-CSGP MLCCs 10 V(DC)
Capacitance10 µF
Capacitance±10% 
Rated Voltage10 V (DC)
Size0805 
Operating Temperature -55 °C up to +125 °C
Dissipation Factor10 %
Insulation Resistance0.01 GΩ
Ceramic TypeX7R Class II 
Length2 mm
Width1.25 mm
Height1.25 mm
Pad Dimension0.5 mm
Packaging7" Tape & Reel 
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61301011821
SPECWR-PHD Socket Header - Single, –, –
Simu­lation–
Availability
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Downloads7 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWR-PHD Socket Header - Single
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Operating Temperature -40 °C up to +105 °C
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Insulation Resistance1000 MΩ
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Length25.9 mm
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PackagingTray 
Pins10 
TypeStraight 
MountTHT 
Rated Current3 A
Working Voltage250 V (AC)
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61000418221
SPECWR-PHD Pin Header - Single, –, –
Simu­lation–
Availability
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Downloads7 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWR-PHD Pin Header - Single
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Operating Temperature -40 °C up to +105 °C
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Insulation Resistance1000 MΩ
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Length10.16 mm
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PackagingTube 
Pins4 
TypeStraight Type 1 
MountSMT 
Rated Current3 A
Working Voltage250 V (AC)
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61300211121
SPECWR-PHD Pin Header - Single, –, –
Simu­lation–
Availability
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Downloads7 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWR-PHD Pin Header - Single
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Operating Temperature -40 °C up to +105 °C
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Insulation Resistance1000 MΩ
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Length5.08 mm
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PackagingBag 
Pins2 
TypeStraight 
MountTHT 
Rated Current3 A
Working Voltage250 V (AC)
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