Fig. 2 TL431 based sink-current regulator driving high current constant current source.
TL431 Sink Mode Constant Current Circuits
by Lewis Loflin
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.
Click for larger image.
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
- Transistor-Zener Diode Regulator Circuits
- AC Power Supply Rectification
- Coils for Highly Selective Crystal Radio
- Neon (NE-2) Circuits You Can Build
- Photodiode Circuits Operation and Uses
- Photodiode Op-Amp Circuits Tutorial
Web site Copyright Lewis Loflin, All rights reserved.
If using this material on another site, please provide a link back to my site.