UCC38083DR

Overview

Category: Integrated Circuit (IC)

Use: Power Management IC

Characteristics: - High-performance current mode PWM controller - Designed for off-line and DC-to-DC converter applications - Provides necessary features to implement a highly efficient power supply design

Package: SOIC-8

Essence: The UCC38083DR is a high-performance current mode PWM controller that is widely used in power management applications. It offers various features to enable the implementation of efficient power supply designs.

Packaging/Quantity: The UCC38083DR is available in a standard SOIC-8 package. It is typically sold in reels or tubes containing multiple units.

Specifications

• Input Voltage Range: 7 V to 20 V
• Output Voltage Range: 0 V to 5 V
• Operating Temperature Range: -40°C to 125°C
• Maximum Duty Cycle: 100%
• Oscillator Frequency Range: 50 kHz to 1 MHz
• Output Current: 200 mA

Pin Configuration

The UCC38083DR has the following pin configuration:

1. COMP: Compensation pin for feedback control loop
2. CS: Current sense input for current mode control
3. RT/CT: Timing resistor/capacitor connection for oscillator frequency control
4. GND: Ground reference
5. VREF: Reference voltage output
6. VCC: Supply voltage input
7. OUT: Output voltage
8. FB: Feedback pin for voltage regulation

Functional Features

• Current mode control with adjustable slope compensation
• Internal soft-start function for controlled startup
• Overvoltage protection
• Undervoltage lockout
• Error amplifier with high gain and low offset voltage
• Adjustable oscillator frequency
• Adaptive shoot-through protection

Advantages

• High-performance current mode control for efficient power supply designs
• Wide input voltage range allows flexibility in various applications
• Adjustable oscillator frequency enables optimization for different operating conditions
• Internal soft-start function ensures controlled startup, reducing stress on components
• Comprehensive protection features enhance system reliability

Disadvantages

• Limited output current capability (200 mA)
• Requires external components for complete power supply implementation
• Not suitable for high-power applications due to its package size and limitations

Working Principles

The UCC38083DR operates based on the current mode control principle. It compares the sensed current through the power switch with a reference voltage to regulate the output voltage. By adjusting the slope compensation, the controller ensures stable operation and prevents subharmonic oscillations.

During startup, the internal soft-start function gradually increases the duty cycle, allowing the power supply to reach its steady-state operation smoothly. The adaptive shoot-through protection prevents both high-side and low-side MOSFETs from conducting simultaneously, avoiding short circuits.

Detailed Application Field Plans

The UCC38083DR is commonly used in various power management applications, including:

1. Switching Power Supplies: The IC is suitable for designing efficient and compact switching power supplies used in consumer electronics, industrial equipment, and telecommunications.
2. LED Lighting: The UCC38083DR can be employed in LED driver circuits to provide precise current regulation and dimming capabilities.
3. Battery Chargers: The controller's adjustable oscillator frequency and comprehensive protection features make it suitable for battery charger designs.

Detailed and Complete Alternative Models

1. UCC28083DR: Similar to UCC38083DR but with extended temperature range (-40°C to 150°C).
2. UCC38084DR: Offers additional features such as overcurrent protection and thermal shutdown.
3. UCC38085DR: Provides higher output current capability (500 mA) for more demanding applications.

These alternative models offer similar functionality to the UCC38083DR but may have different specifications or additional features to suit specific requirements.

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