UCC3946NG4

Product Overview

Category: Integrated Circuits (ICs)

Use: Voltage Mode PWM Controller

Characteristics: - High-performance voltage mode pulse width modulation (PWM) controller - Designed for use in power supply applications - Provides precise control over the output voltage and current

Package: PDIP-8 (Plastic Dual In-Line Package)

Essence: UCC3946NG4 is a voltage mode PWM controller that offers efficient and accurate control over power supply applications.

Packaging/Quantity: The UCC3946NG4 is available in a PDIP-8 package, which contains 25 units per tube.

Specifications

• Supply Voltage Range: 7V to 40V
• Operating Temperature Range: -40°C to 85°C
• Output Current: Up to 1A
• Frequency Range: 100kHz to 500kHz
• Duty Cycle Range: 0% to 100%
• Error Amplifier Gain Bandwidth: 2.5MHz

Detailed Pin Configuration

The UCC3946NG4 has the following pin configuration:

1. VREF: Reference voltage input
2. COMP: Error amplifier output
3. FB: Feedback voltage input
4. RT/CT: Timing resistor/capacitor connection
5. CT: Timing capacitor connection
6. GND: Ground
7. OSC: Oscillator timing capacitor connection
8. VCC: Power supply voltage input

Functional Features

• Voltage mode control with adjustable duty cycle
• Error amplifier with high gain bandwidth for precise regulation
• Soft-start function for controlled startup
• Overcurrent protection
• Undervoltage lockout
• Adjustable frequency range for flexibility in design

Advantages and Disadvantages

Advantages: - Precise control over output voltage and current - Wide operating voltage range - High-performance error amplifier - Protection features for enhanced reliability - Adjustable frequency range for design flexibility

Disadvantages: - Limited output current capability (up to 1A)

Working Principles

The UCC3946NG4 operates on the principle of voltage mode control. It compares the feedback voltage (FB) with a reference voltage (VREF) and adjusts the duty cycle of the PWM signal accordingly. The error amplifier amplifies the difference between the two voltages and provides the necessary control signal to regulate the output voltage. The timing resistor (RT) and timing capacitor (CT) determine the frequency of the PWM signal.

Detailed Application Field Plans

The UCC3946NG4 is commonly used in various power supply applications, including:

1. Switching Power Supplies
2. DC-DC Converters
3. Battery Chargers
4. LED Drivers
5. Industrial Control Systems

Detailed and Complete Alternative Models

1. UCC3842: Voltage Mode PWM Controller, similar functionality with different package options.
2. UC3843: Current Mode PWM Controller, alternative control method with similar specifications.
3. TL494: Pulse Width Modulation Control Circuit, offers additional features like dead-time control.

These alternative models provide similar functionality and can be considered as substitutes for the UCC3946NG4 based on specific design requirements.

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