UCC3808DTR-2

Product Overview

Category

UCC3808DTR-2 belongs to the category of integrated circuits (ICs) specifically designed for power management applications.

Use

This IC is commonly used in various power supply systems, including switch-mode power supplies (SMPS), battery chargers, and DC-DC converters.

Characteristics

• Low-power current mode PWM controller
• Wide input voltage range: 4.5V to 25V
• Adjustable frequency up to 1MHz
• Integrated high-voltage startup circuitry
• Internal soft-start feature for controlled power-up
• Overcurrent protection with adjustable threshold
• Under-voltage lockout (UVLO) protection
• Available in a small surface-mount package (SOIC-8)

Package and Quantity

UCC3808DTR-2 is packaged in an SOIC-8 package, which stands for Small Outline Integrated Circuit. It has eight pins and is suitable for surface-mount assembly. The product is typically sold in reels or tubes containing multiple units.

Specifications

• Input Voltage Range: 4.5V to 25V
• Output Voltage Range: 0V to VCC
• Maximum Duty Cycle: 100%
• Operating Temperature Range: -40°C to +85°C
• Switching Frequency Range: Up to 1MHz
• Quiescent Current: 1.7mA (typical)
• Output Current: Up to 500mA

Pin Configuration

The UCC3808DTR-2 IC has the following pin configuration:

```

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

1. VREF: Reference voltage input pin.
2. COMP: Error amplifier output and compensation pin.
3. FB: Feedback pin for regulating the output voltage.
4. CS: Current sense input pin for overcurrent protection.
5. RT/CT: Timing resistor/capacitor connection pin.
6. GND: Ground reference pin.
7. OUT: Power switch output pin.
8. VCC: Supply voltage input pin.

Functional Features

1. Low-power current mode control: The UCC3808DTR-2 utilizes a low-power current mode control technique, which provides efficient power management while minimizing power losses.

2. Wide input voltage range: With an input voltage range of 4.5V to 25V, this IC can be used in a wide variety of applications, accommodating different power supply requirements.

3. Adjustable frequency: The switching frequency of the IC can be adjusted up to 1MHz, allowing flexibility in designing power supply systems with varying performance requirements.

4. Integrated high-voltage startup circuitry: The built-in high-voltage startup circuit simplifies the power-up process and eliminates the need for external components.

5. Overcurrent protection: The UCC3808DTR-2 features overcurrent protection with an adjustable threshold, ensuring safe operation by limiting the output current under fault conditions.

6. Under-voltage lockout (UVLO) protection: The UVLO protection prevents the IC from operating when the input voltage falls below a certain threshold, safeguarding against improper functioning during low voltage conditions.

Advantages and Disadvantages

Advantages

• Efficient power management due to low-power current mode control.
• Wide input voltage range enables versatile application possibilities.
• Adjustable frequency allows optimization for specific system requirements.
• Integrated high-voltage startup circuit simplifies design and reduces component count.
• Overcurrent protection ensures safe operation under fault conditions.
• Under-voltage lockout protection enhances system reliability.

Disadvantages

• Limited output current capability (up to 500mA).
• Requires external components for complete power supply system implementation.
• Not suitable for high-power applications due to its low-power design.

Working Principles

The UCC3808DTR-2 operates based on the principle of pulse width modulation (PWM). It regulates the output voltage by controlling the duty cycle of the power switch. The error amplifier compares the feedback voltage with the reference voltage and adjusts the duty cycle accordingly. This control mechanism ensures stable and accurate output voltage regulation.

Detailed Application Field Plans

The UCC3808DTR-2 is widely used in various power management applications, including:

1. Switch-mode power supplies (SMPS): The IC is commonly employed in SMPS designs, enabling efficient conversion of electrical power from one form to another.

2. Battery chargers: With its adjustable frequency and overcurrent protection features, the UCC3808DTR-2 is suitable for designing battery chargers that require precise control and protection mechanisms.

3. DC-DC converters: The