UCC38085PW

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: PWM Controller
• Package: PowerPAD SOIC
• Essence: High-performance voltage mode PWM controller
• Packaging/Quantity: Tube/100 pieces

Specifications

• Input Voltage Range: 8V to 18V
• Output Voltage Range: 0.8V to 7.5V
• Operating Temperature Range: -40°C to +125°C
• Switching Frequency: 50kHz to 1MHz
• Duty Cycle Range: 0% to 100%
• Maximum Duty Cycle: 90%
• Output Current: 500mA
• Oscillator Frequency Range: 50kHz to 1MHz
• Shutdown Current: 10µA

Detailed Pin Configuration

The UCC38085PW has the following pin configuration:

1. COMP: Compensation pin for external compensation network.
2. FB: Feedback pin for regulating the output voltage.
3. VREF: Reference voltage output pin.
4. RT/CT: Timing resistor and capacitor connection pin for setting oscillator frequency.
5. CS: Current sense input pin for current limit protection.
6. GND: Ground reference pin.
7. VCC: Supply voltage input pin.
8. OUT: Output pin for driving external power MOSFET.

Functional Features

• Voltage mode control with adjustable duty cycle.
• Adaptive dead-time control for improved efficiency.
• Internal soft-start for controlled startup.
• Overcurrent protection with adjustable current limit.
• Undervoltage lockout for reliable operation.
• Error amplifier with external compensation for precise regulation.
• Thermal shutdown protection.

Advantages and Disadvantages

Advantages: - Wide input voltage range allows for versatile applications. - Adjustable duty cycle provides flexibility in power management. - Adaptive dead-time control improves efficiency. - Internal soft-start ensures controlled startup. - Overcurrent protection enhances system reliability. - Undervoltage lockout prevents improper operation. - Error amplifier with external compensation enables precise regulation. - Thermal shutdown protection safeguards against overheating.

Disadvantages: - Limited output current of 500mA may not be suitable for high-power applications. - Requires an external compensation network for optimal performance.

Working Principles

The UCC38085PW is a voltage mode PWM controller that regulates the output voltage by adjusting the duty cycle of the power MOSFET. It operates by comparing the feedback voltage (FB) with the reference voltage (VREF) and generating a control signal to adjust the duty cycle accordingly. The timing resistor (RT) and capacitor (CT) connected to the RT/CT pin set the oscillator frequency, which determines the switching frequency of the power MOSFET. The COMP pin allows for external compensation to fine-tune the regulation loop.

Detailed Application Field Plans

The UCC38085PW is commonly used in various power management applications, including:

1. Switching Power Supplies: The controller can be used in offline or isolated DC-DC converters, providing efficient power conversion for a wide range of electronic devices.
2. LED Lighting: The adjustable duty cycle and precise regulation make it suitable for driving LED lights, ensuring stable and flicker-free illumination.
3. Battery Chargers: The controller can be employed in battery charging circuits, enabling efficient and controlled charging of batteries in various applications.
4. Motor Control: The UCC38085PW can be utilized in motor drive circuits, offering precise control over motor speed and direction.

Detailed and Complete Alternative Models

Some alternative models to the UCC38085PW include:

1. UCC28085PW: Similar functionality with a wider input voltage range.
2. UC3845B: Voltage mode PWM controller with higher output current capability.
3. TL494: PWM controller with adjustable frequency and duty cycle.
4. SG3525A: Regulating pulse width modulator with adjustable dead-time control.

These alternative models provide similar features and can be considered based on specific application requirements.

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