.. the need for feedback components, the power stage uses a constant current source design. This allows a shunt, such as the TL431 or even a simple zener clamp, to provide output voltage regulation. Dual comparators act as a low-cost dc-dc ...
.. the current across R 3 , turning off Q 2 . When the rectified line voltage is lower than 380V, the cathode current of the TL431 is approximately 0A. Thus, Q 2 turns on through R3, connecting bulk capacitor C and R LOAD to the full-wave ...
.. Comparator U1b compares the value of the sawtooth-like waveform across C1 to a 4.49-V reference voltage provided by U3, a TL431 adjustable shunt regulator (Fig. 2). The output of U1b is connected to the gate of the N-channel MOSFET (T1), ...
.. switch between doubler and bridge configurations. For 115V-rms 20% line operation, the Reference terminal of the TL431 programmable shunt regulator has a voltage lower than its 2.5V internal reference (Figure 2). In this ...
.. a dual comparator circuit LM393 I have conceived the two regulators: of current respectively of voltage. The zener diode TL431 previously ordered is the reference source of the assembly and it insures a constant voltage of 2.5V by ...
.. S 1 switches the DPM between a set value and the actual temperature readout. You derive the reference voltage from a TL431 shunt regulator (not shown). The LED lights up when Q 2 is on. Figure 1. IC 1 senses the temperature of the ...
.. output voltage and Q1 acts as a simple error amplifier. Although the regulation is inferior to that of a conventional TL431 and optocoupler feedback circuit, it is typically adequate for most applications with a regulation of +/- 5% ...
.. simple precision 0/20 mA to 4/20 mA converter [ 1 ]. Silly simple precision 0/20 mA to 4/20 mA converter [ 2 ]. Combine two TL431 regulators to make versatile current mirror [ 3 ]. A 0-20 mA source current to 4-20 mA loop current converter [ ...
.. constant current into a nice, evenly stepped output voltage. This could probably be done using a voltage reference (e.g., TL431) and a transistor. But that means additional active components and careful design. This is getting away from ...
.. example. IC 3 , R 1 , R 2 , and V 1 form the feedback circuit to set the output voltage. The output-voltage equation is The TL431 is a popular part for setting a voltage reference and can easily create the 1.25 V shown for V 1 . You can ...