Uc3842 Smps Circuit Diagram With Explanation Pdf

By | May 17, 2023

UC3842 SMPS Circuit Diagram With Explanation

The UC3842 is a popular integrated circuit (IC) used in switch-mode power supplies (SMPS). It is a monolithic, complete, constant-voltage, constant-frequency (CVC/CFL) controller that can be used in a wide range of applications. The UC3842 features a high slew rate, low EMI, and excellent transient response. It is also very easy to use, making it a popular choice for designers of SMPS. In this article, we will take a look at the UC3842 in detail. We will discuss its features and operation, and we will provide a complete UC3842 SMPS circuit diagram with explanation.

Features of the UC3842

The UC3842 has a number of features that make it a popular choice for SMPS designers. These features include: *

High slew rate:

The UC3842 has a high slew rate of up to 100 V/µs. This allows it to quickly respond to changes in load current, resulting in a more efficient power supply. *

Low EMI:

The UC3842 has a low EMI output, making it suitable for use in applications where EMI is a concern. *

Excellent transient response:

The UC3842 has excellent transient response, making it suitable for use in applications where there are sudden changes in load current. *

Easy to use:

The UC3842 is very easy to use. It has a simple pinout and a well-defined set of control signals.

Operation of the UC3842

The UC3842 operates in a CVC/CFL mode. This means that it maintains a constant output voltage and a constant output frequency. The UC3842 does this by using a feedback loop to compare the output voltage to a reference voltage. If the output voltage deviates from the reference voltage, the UC3842 will adjust the duty cycle of the switching waveform to bring the output voltage back in line. The UC3842 has a number of control signals that can be used to adjust its operation. These signals include: *

VCC:

The VCC pin supplies power to the UC3842. The recommended operating voltage is between 5 and 15 V. *

VREF:

The VREF pin provides a reference voltage for the UC3842. The recommended value for VREF is 5 V. *

EN:

The EN pin enables the UC3842. When EN is high, the UC3842 is enabled and will start to operate. When EN is low, the UC3842 is disabled and will stop operating. *

SS:

The SS pin sets the output voltage of the UC3842. The output voltage is proportional to the voltage at the SS pin. *

FB:

The FB pin provides feedback to the UC3842. The UC3842 uses the feedback signal to adjust the duty cycle of the switching waveform.

UC3842 SMPS Circuit Diagram

The following is a complete UC3842 SMPS circuit diagram with explanation: [Image of UC3842 SMPS circuit diagram] The following is a brief explanation of the circuit diagram: * The input voltage is applied to the VIN pin of the UC3842. * The VREF pin is connected to a 5 V reference voltage. * The EN pin is connected to a logic high voltage to enable the UC3842. * The SS pin is connected to a potentiometer to set the output voltage of the SMPS. * The FB pin is connected to the output of the SMPS. * The Q1 transistor is the main switch in the SMPS. * The D1 diode is a freewheeling diode that protects Q1 from reverse voltage. * The C1 capacitor filters the output voltage of the SMPS.

Conclusion

The UC3842 is a popular IC used in SMPS. It is a versatile and easy-to-use device that can be used in a wide range of applications. The UC3842 has a number of features that make it a good choice for SMPS designers, including a high slew rate, low EMI, excellent transient response, and easy to use. The UC3842 is also very affordable, making it a cost-effective solution for SMPS design. Here are some additional resources that you may find helpful: * [UC3842 datasheet](https://www.onsemi.com/pub/Collateral/UC


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