UCC3817DW

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Mode PWM Controller
• Characteristics:
  • High-performance controller for DC-DC converters
  • Provides precise regulation of output voltage
  • Offers protection features for enhanced reliability
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Control and regulation of voltage in power supply applications
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 4.5V to 16V
• Output Voltage Range: 0.8V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Switching Frequency: Up to 1MHz
• Duty Cycle Range: 0% to 100%
• Maximum Output Current: 500mA

Detailed Pin Configuration

The UCC3817DW has the following pin configuration:

1. COMP: Compensation pin for external compensation network.
2. FB: Feedback pin for regulating the output voltage.
3. RT/CT: Timing resistor/capacitor connection pin for setting switching frequency.
4. VREF: Reference voltage output pin.
5. GND: Ground reference pin.
6. CS: Current sense input pin for current limit protection.
7. SS/TR: Soft-start/Shutdown control pin.
8. VCC: Power supply input pin.

Functional Features

• Voltage mode control with adjustable duty cycle.
• Precision voltage reference for accurate regulation.
• Programmable soft-start feature for controlled startup.
• Overcurrent protection with adjustable current limit.
• Undervoltage lockout for reliable operation.
• Error amplifier for feedback loop stability.

Advantages and Disadvantages

Advantages: - High-performance controller for precise voltage regulation. - Wide input and output voltage range for versatile applications. - Protection features enhance system reliability. - Programmable soft-start for controlled startup. - Compact SOIC package for space-constrained designs.

Disadvantages: - Limited maximum output current of 500mA. - Requires external compensation network for stability.

Working Principles

The UCC3817DW is a voltage mode PWM controller used in DC-DC converters. It operates by comparing the feedback voltage (FB) with a precise reference voltage (VREF). The error amplifier generates an error signal, which is then compared to a sawtooth waveform generated by the timing resistor/capacitor (RT/CT) network. This comparison determines the duty cycle of the output waveform, controlling the power delivered to the load.

The soft-start feature gradually increases the duty cycle during startup, preventing excessive inrush current. The overcurrent protection limits the output current to prevent damage to the converter and load. Undervoltage lockout ensures proper operation within specified voltage ranges.

Detailed Application Field Plans

The UCC3817DW is commonly used in various power supply applications, including:

1. Switching Power Supplies: Provides precise regulation and control in switch-mode power supplies for computers, telecommunication equipment, and industrial systems.
2. Battery Chargers: Enables efficient charging of batteries by regulating the output voltage and current.
3. LED Lighting: Controls the power delivered to LEDs, ensuring stable and flicker-free illumination.
4. Motor Drives: Regulates the voltage supplied to motor drives, enhancing performance and efficiency.
5. Automotive Electronics: Used in automotive power systems, such as electric vehicles and hybrid cars, for reliable voltage regulation.

Detailed and Complete Alternative Models

1. UCC3813DW: Similar functionality with lower output current capability.
2. UCC3818DW: Higher output current capability with additional protection features.
3. UCC3819DW: Enhanced precision and accuracy for demanding applications.

These alternative models offer similar functionality to the UCC3817DW, catering to different requirements and specifications.

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