UCC38085P - English Editing Encyclopedia Entry

Product Overview

Category

UCC38085P belongs to the category of integrated circuits (ICs) specifically designed for power management applications.

Use

This IC is commonly used in various power supply designs, including switch-mode power supplies (SMPS), battery chargers, and LED drivers.

Characteristics

• UCC38085P is a high-performance current mode PWM controller.
• It operates with a wide input voltage range, making it suitable for different power supply applications.
• The IC offers excellent line and load regulation, ensuring stable output voltages.
• It provides protection features such as overvoltage protection (OVP), undervoltage lockout (UVLO), and thermal shutdown.

Package and Quantity

UCC38085P is available in a standard 8-pin dual in-line package (DIP). It is typically sold in reels or tubes containing multiple units.

Essence

The essence of UCC38085P lies in its ability to regulate and control power supply systems efficiently, ensuring reliable and stable operation.

Packaging/Quantity

UCC38085P is commonly packaged in a plastic DIP, and it is usually sold in quantities of 100 or more.

Specifications

• Input Voltage Range: 9V to 30V
• Output Voltage Range: Adjustable from 0.8V to 28V
• Maximum Output Current: 500mA
• Switching Frequency: 50kHz to 1MHz
• Operating Temperature Range: -40°C to 125°C

Detailed Pin Configuration

1. VREF: Reference voltage output pin.
2. COMP: Compensation pin for loop stability.
3. FB: Feedback pin for regulating the output voltage.
4. CS: Current sense input pin.
5. GND: Ground reference pin.
6. RT/CT: Timing resistor and capacitor connection pin.
7. VCC: Power supply input pin.
8. OUT: Output pin for driving external power devices.

Functional Features

• Current Mode PWM Control: UCC38085P utilizes current mode control to regulate the output voltage accurately.
• Adjustable Frequency: The switching frequency can be adjusted according to the application requirements.
• Soft Start: This feature ensures a controlled startup, preventing excessive inrush currents.
• Overvoltage Protection (OVP): UCC38085P incorporates OVP circuitry to safeguard against voltage spikes.
• Undervoltage Lockout (UVLO): It includes UVLO functionality to prevent operation below specified voltage levels.
• Thermal Shutdown: The IC has built-in thermal shutdown protection to prevent overheating.

Advantages and Disadvantages

Advantages

• Wide input voltage range allows for versatile applications.
• Excellent line and load regulation ensure stable output voltages.
• Comprehensive protection features enhance system reliability.
• Adjustable frequency provides flexibility in design.

Disadvantages

• Limited maximum output current may not be suitable for high-power applications.
• DIP package may not be ideal for space-constrained designs.

Working Principles

UCC38085P operates based on the current mode control technique. It compares the sensed current with a reference voltage to generate a control signal that regulates the duty cycle of the power switch. By adjusting the duty cycle, the IC maintains the desired output voltage despite variations in input voltage and load conditions.

Detailed Application Field Plans

UCC38085P finds applications in various power management systems, including: 1. Switch-mode power supplies (SMPS) for computers, telecommunication equipment, and industrial machinery. 2. Battery chargers for portable devices, electric vehicles, and renewable energy systems. 3. LED drivers for lighting applications, such as streetlights, automotive lighting, and display backlighting.

Detailed and Complete Alternative Models

1. UCC38083P: Similar to UCC38085P but with a lower maximum output current of 300mA.
2. UCC38086P: Similar to UCC38085P but with an extended input voltage range up to 60V.
3. UCC38089P: Similar to UCC38085P but with additional protection features like overcurrent protection and short-circuit protection.

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