Fig. 2 TL431 based sink-current regulator driving high current constant current source.
TL431 Sink Mode Constant Current Circuits
by Lewis Loflin
Follow @Lewis90068157
Related see TL431 Battery Charger Voltage Detector Circuits Schematics
See standard resistor values chart resistor_values.jpg
The TL431 can be used in its "sink" configuration to control a constant current source as shown above.
Fig. 3 TL431 based sink-current regulator driving high current constant current
source with optocoupler ON-OFF control.
Click for larger image.
Fig. 4 TL431 current sink regulator driving three parallel transistor high current
constant current source with optocoupler ON-OFF control.
Note the voltage across the 0.25-Ohm resistor can be used by a microcontroller to measure current.
- TL431 Battery Charger Voltage Detector Circuits Schematics
- Arduino Constant Current H-Bridge Motor Control
- TL431 Battery Charger Voltage Detector Circuits Schematics
- TL431 Sink Mode Constant Current Circuits
Fig. 5
Click for larger image.
In Fig. 5 a low value resistor and an LM358 op-amp enables a microcontroller to measure battery charge current. This can monitor both charge current and load current.
See
- Arduino Measures Current from Constant Current Source
- Measure Current from Constant Current Source with Arduino
- Arduino Controlled Power Constant Current Source
- Arduino Controlled Constant Current Source YouTube video
TL431 Related
- Using TL431A Li-Ion Battery Charger Tutorials
- TL431A Lithium-Ion Cell Charging Circuits
- Charging Multi-Cell Lithium-Ion Battery Packs
- TL431 Over-Voltage, Under-Voltage Detector Circuits
- TL431A Constant Current Source Working Circuits Demo
- Power TL431 Constant Current Source Circuits
Related YouTube videos.
- TL431 12V Battery Charger Complete
- TL431A Lithium-Ion Cell Charging Circuits
- TL431 Battery Charger Circuit Calculations Revised
- TL431 10-Volt Charger Short Version
- Charging, Charge-Balancing 18V Li-Ion Battery with TL431
- 18.5V Li-Ion Battery Charger with TL431 short version
- TL431 Under-Voltage, Over-Voltage Detection
- TL431 Constant Current Source Circuits
Other Circuits
- Arduino Measures Current from Constant Current Source
- Constant Current Source Theory Testing
- Arduino Controlled Power Constant Current Source
- LM317 Adjustable Current Boost Power Supply
- Constant Current Circuits LM334, LM317
- Build LM317 0-34 Volt Power Supply
- LM334 Constant Current Source with Resistive Sensors
- LM317 High Power Constant Current Source Circuit
- LM317 Constant Current Source Circuits
- Test SCRs and Triacs
- Basic MOSFET Transistor Test Circuits
- High Voltage MOSFET Switching Circuits
- 3 Amp LM741 Op-Amp Constant Current Source
- Current Limiter Testing of Zener Diodes
- Current Limiter for Opto-Coupler Inputs
- LM317 CCS for Light Emitting Diodes
Other Circuits
- Hall Effect Magnetic Switches and Sensors
- Comparator Theory Circuits Tutorial
- ULN2003A Darlington Transistor Array with Circuit Examples
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- AC Power Supply Rectification
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- Photodiode Op-Amp Circuits Tutorial
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If using this material on another site, please provide a link back to my site.