UCC3803DTR

Product Overview

Category

UCC3803DTR 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 LED drivers.

Characteristics

• UCC3803DTR is a high-performance pulse width modulation (PWM) controller.
• It operates at a fixed frequency of 100 kHz, providing stable and efficient power regulation.
• The IC incorporates various protection features such as overvoltage protection (OVP), undervoltage lockout (UVLO), and thermal shutdown.
• It offers excellent line and load regulation, ensuring reliable power delivery under varying conditions.

Package and Quantity

UCC3803DTR is available in a small outline package (SOT-23-6) which provides compactness and ease of integration into electronic circuits. It is typically sold in reels containing 3000 units.

Specifications

• Input Voltage Range: 7 V to 25 V
• Output Voltage Range: 0 V to VCC
• Maximum Duty Cycle: 100%
• Operating Temperature Range: -40°C to 85°C
• Oscillator Frequency: 100 kHz
• Error Amplifier Gain Bandwidth: 2 MHz
• Maximum Output Current: 500 mA

Pin Configuration

___________ | | NC |1 6| VCC FB |2 5| GND CS |3 4| OUT |___________|

1. NC: No Connection
2. FB: Feedback Pin (Error Amplifier Input)
3. CS: Current Sense Pin
4. OUT: Output Pin
5. GND: Ground Pin
6. VCC: Power Supply Pin

Functional Features

• UCC3803DTR utilizes a voltage mode control scheme to regulate the output voltage.
• It employs an internal error amplifier to compare the feedback voltage with a reference voltage, adjusting the duty cycle accordingly.
• The current sense pin allows precise current sensing for overcurrent protection and accurate current limiting.
• The IC incorporates a soft-start feature to prevent excessive inrush current during startup.
• It provides adjustable frequency operation through external components, allowing flexibility in power supply design.

Advantages and Disadvantages

Advantages

• High-performance PWM controller with excellent line and load regulation.
• Compact SOT-23-6 package for easy integration into various applications.
• Incorporates multiple protection features for enhanced reliability.
• Adjustable frequency operation enables customization based on specific requirements.

Disadvantages

• Limited maximum output current of 500 mA may not be suitable for high-power applications.
• Fixed operating frequency may restrict certain design possibilities.

Working Principles

UCC3803DTR operates by comparing the feedback voltage from the output with a reference voltage. The error amplifier amplifies the difference between these voltages and generates an error signal. This signal is then fed into the PWM comparator, which compares it with a sawtooth waveform generated by the internal oscillator. Based on this comparison, the duty cycle of the PWM signal is adjusted, regulating the output voltage. The current sense pin monitors the current flowing through the power switch, providing overcurrent protection and accurate current limiting.

Application Field Plans

UCC3803DTR finds extensive application in various power management systems, including: 1. Switch-mode power supplies (SMPS) for computers, televisions, and industrial equipment. 2. Battery chargers for mobile devices, electric vehicles, and renewable energy systems. 3. LED drivers for lighting applications, such as streetlights, automotive lighting, and display backlighting.

Alternative Models

1. UCC3803DTRG4: Similar to UCC3803DTR, but with extended temperature range (-40°C to 125°C).
2. UCC3803D: DIP-8 package variant of UCC3803DTR.
3. UCC3803N: PDIP-8 package variant of UCC3803DTR.

These alternative models offer similar functionality and can be used as drop-in replacements for UCC3803DTR in various applications.

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