NCV3843BVDR2G - English Editing Encyclopedia Entry

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Mode PWM Controller

Characteristics: - High-performance voltage mode controller - Designed for offline and DC-to-DC converters - Provides precise control of power supply output voltage - Offers protection features for safe operation

Package: SOIC-8

Essence: The NCV3843BVDR2G is a voltage mode PWM controller that is widely used in various power supply applications. It offers high performance and precise control over the output voltage of power supplies.

Packaging/Quantity: The NCV3843BVDR2G is typically sold in reels containing 2500 units.

Specifications

• Input Voltage Range: 7V to 30V
• Output Voltage Range: 0V to 5V
• Operating Temperature Range: -40°C to +85°C
• Maximum Duty Cycle: 100%
• Oscillator Frequency Range: 50kHz to 500kHz
• Current Limit Range: 1A to 10A

Detailed Pin Configuration

The NCV3843BVDR2G has a total of 8 pins, which are as follows:

1. COMP: Compensation pin for feedback loop stability.
2. CS: Current sense input pin for current limit control.
3. GND: Ground reference pin.
4. VCC: Power supply input pin.
5. FB: Feedback pin for regulating the output voltage.
6. RT/CT: Timing components connection pin.
7. OUT: Output pin for driving external power devices.
8. SS/TR: Soft-start and shutdown control pin.

Functional Features

• Voltage mode control for precise regulation of output voltage.
• Adjustable oscillator frequency for flexibility in design.
• Current limit protection for safe operation.
• Soft-start function for gradual power-up.
• Shutdown control for power-saving mode.

Advantages and Disadvantages

Advantages: - High-performance voltage mode controller. - Precise regulation of output voltage. - Wide input voltage range. - Current limit protection for safe operation. - Flexible oscillator frequency adjustment.

Disadvantages: - Limited maximum duty cycle. - Requires external timing components. - Not suitable for high-frequency applications.

Working Principles

The NCV3843BVDR2G operates on the principle of voltage mode control. It compares the feedback voltage with a reference voltage to generate an error signal. This error signal is then amplified and used to control the duty cycle of the PWM signal, which in turn regulates the output voltage. The oscillator frequency can be adjusted to achieve the desired performance.

Detailed Application Field Plans

The NCV3843BVDR2G is commonly used in the following application fields:

1. Offline Power Supplies: It is widely employed in offline power supplies for various electronic devices such as televisions, computers, and home appliances.
2. DC-to-DC Converters: The NCV3843BVDR2G is also utilized in DC-to-DC converters, enabling efficient voltage conversion in applications like automotive electronics and industrial equipment.

Detailed and Complete Alternative Models

1. UC3843: A popular alternative model with similar functionality and pin configuration.
2. SG3525: Another widely used alternative offering voltage mode control for power supply applications.
3. TL494: An integrated circuit providing PWM control and protection features for power supply designs.

These alternative models offer comparable performance and can be considered as substitutes for the NCV3843BVDR2G in various applications.

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