UCD224A103 3BHE023681R0103 3BHE023682P201 | ABB | Inverted input terminal of error amplifier

Description

UCD224A103 3BHE023681R0103 3BHE023682P201 | ABB | Inverted input terminal of error amplifier

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The UCD224A103  voltage of 2.5V is connected to the inverting input terminal of the error amplifier, the reference voltage is connected to the in-phase input terminal, and the output terminal of the error amplifier is connected to a transistor. Note that this is an error amplifier rather than a comparator. The so-called error amplifier generates an error voltage by comparing the difference between the feedback voltage and the reference voltage, thereby adjusting the voltage drop of the transistor. The transistor operates in the linear region instead of the saturation region

The above UCD224A103  shows a typical connection of TL431. By configuring different values of R1 and R2, any voltage output (Vo<Vin) within the range of 2.5V to 36V can be obtained. The output voltage formula is Vout=(R1+R2) * 2.5/R2. Specifically, when R1=R2, Vo=5V. In addition, there are two points to note when applying this method. Firstly, when selecting a resistor, it is necessary to ensure that the TL431 operates under the necessary conditions, that is, the current passing through the cathode must be greater than 1 mA. Secondly, the output voltage of this circuit can only be used as a reference voltage and cannot be used as a power source with a load.
The voltage UCD224A103  feedback of switch mode power supplies usually uses TL431 and PC817. If the output voltage requirement is not high, voltage stabilization diodes and PC817 can also be used. Below is a typical application diagram to analyze the dynamic process.

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