Add six resistors and one transistor to two TL431s to make this 0/20 mA to 4/20 mA current loop converter. Z2 sums the 500-mV offset provided by Z1 with the 0 to 2 V made by current sensor R1, then scales that with R2 to output the 4 to 20 mA with a boost
| Authors | Stephen Woodward |
| Main Document | Article «Combine two TL431 regulators to make versatile current mirror» |
| Description | Figure 3 |
| File Format / Size | PDF / 14 Kb |
| Document Language | English |
Other Materials from the Main Document
- Article «Combine two TL431 regulators to make versatile current mirror»
- Figure 1. The R1/R2 resistance ratio sets the I2/I1 current ratio
- Figure 2. Booster transistor Q1 can handle current and power beyond 431 max IC and dissipation limits
- Figure 3. Add six resistors and one transistor to two TL431s to make this 0/20 mA to 4/20 mA current loop converter. Z2 sums the 500-mV offset provided by Z1 with the 0 to 2 V made by current sensor R1, then scales that with R2 to output the 4 to 20 mA with a boost