UCC3817ADG4

Overview

Category: Integrated Circuit (IC)

Use: Voltage Mode PWM Controller

Characteristics: - High-performance voltage mode pulse-width modulation (PWM) controller - Designed for use in switch-mode power supplies (SMPS) - Provides precise control over the output voltage and current regulation - Offers protection features such as overvoltage, undervoltage, and overcurrent protection

Package: SOIC-8 (Small Outline Integrated Circuit)

Essence: UCC3817ADG4 is a voltage mode PWM controller that plays a crucial role in regulating the output voltage and current in switch-mode power supplies.

Packaging/Quantity: The UCC3817ADG4 is available in a standard SOIC-8 package. It is typically sold in reels of 2500 units.

Specifications

• Input Voltage Range: 10V to 30V
• Output Voltage Range: 0V to 5V
• Operating Temperature Range: -40°C to +85°C
• Switching Frequency: 100kHz to 1MHz
• Maximum Duty Cycle: 100%
• Supply Current: 2.5mA (typical)

Pin Configuration

The UCC3817ADG4 has the following pin configuration:

```

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| | --| VREF |-- --| COMP |-- --| FB |-- --| CS |-- --| GND |-- --| RT/CT |-- --| VCC |-- |___________| ```

Functional Features

1. Voltage Mode Control: The UCC3817ADG4 utilizes voltage mode control to regulate the output voltage of the power supply. This ensures stability and accuracy in various load conditions.

2. Precise Current Regulation: The controller provides precise current regulation by monitoring the feedback voltage and adjusting the duty cycle accordingly. This feature helps in maintaining a constant output current.

3. Protection Mechanisms: UCC3817ADG4 incorporates various protection mechanisms such as overvoltage, undervoltage, and overcurrent protection. These safeguards prevent damage to the power supply and connected devices.

Advantages

• High-performance voltage mode control ensures stable and accurate output voltage regulation.
• Precise current regulation allows for consistent output current delivery.
• Protection features safeguard the power supply and connected devices from potential damage.
• Compact SOIC-8 package enables easy integration into circuit designs.

Disadvantages

• Limited input voltage range (10V to 30V) may not be suitable for certain applications requiring higher voltages.
• The operating temperature range (-40°C to +85°C) may restrict usage in extreme temperature environments.

Working Principles

The UCC3817ADG4 operates on the principle of voltage mode control. It compares the feedback voltage with a reference voltage to determine the error signal. This error signal is then used to adjust the duty cycle of the PWM signal, which controls the switching of the power supply's MOSFETs. By regulating the duty cycle, the controller maintains a stable output voltage and current.

Application Field Plans

The UCC3817ADG4 finds extensive application in various switch-mode power supply designs, including:

1. DC-DC Converters: It is commonly used in DC-DC converters to regulate the output voltage and current in applications such as telecommunications, industrial equipment, and automotive electronics.

2. LED Lighting: The controller is employed in LED lighting systems to ensure efficient power conversion and precise current control, enabling optimal performance and longevity of LEDs.

3. Battery Chargers: UCC3817ADG4 is utilized in battery charger circuits to provide accurate voltage and current regulation, ensuring safe and efficient charging of batteries in portable devices.

Alternative Models

1. UCC3817ADR: Similar to UCC3817ADG4, but available in an SOIC-14 package.
2. UCC3817AN: DIP-8 package variant of UCC3817ADG4.
3. UCC3817APW: TSSOP-8 package variant with improved power dissipation capabilities.

These alternative models offer similar functionality and can be used as substitutes for UCC3817ADG4 depending on specific design requirements.

In conclusion, the UCC3817ADG4 is a high-performance voltage mode PWM controller designed for switch-mode power supplies. It provides precise control over output voltage and current regulation, along with various protection features. With its compact package and versatile applications, it serves as a reliable component in numerous power supply designs.