UCC3819APWR

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Mode PWM Controller
• Characteristics:
  • High-performance controller for switch-mode power supplies
  • Provides precise regulation of output voltage/current
  • Offers protection features like overvoltage and overcurrent protection
• Package: TSSOP-14
• Essence: Control and regulation of voltage in switch-mode power supplies
• Packaging/Quantity: Available in reels of 2500 units

Specifications

• Input Voltage Range: 4.5V to 16V
• Output Voltage Range: 0.8V to 7.5V
• Operating Temperature Range: -40°C to 85°C
• Switching Frequency: Up to 1MHz
• Maximum Duty Cycle: 90%
• Quiescent Current: 2.5mA

Detailed Pin Configuration

The UCC3819APWR has a total of 14 pins, which are assigned specific functions:

1. COMP: Compensation pin for feedback control loop.
2. FB: Feedback pin for regulating the output voltage.
3. VREF: Reference voltage input for setting the desired output voltage.
4. CS: Current sense input for monitoring the load current.
5. SS/TR: Soft-start and tracking pin for controlling the startup behavior.
6. RT/CT: Timing components connection for setting the oscillator frequency.
7. GND: Ground reference for the IC.
8. VCC: Power supply input for the IC.
9. SYNC: Synchronization input for external clock synchronization.
10. EN: Enable pin for turning the IC on/off.
11. UVLO: Undervoltage lockout pin for protecting against low input voltage conditions.
12. OVP: Overvoltage protection pin for safeguarding against excessive output voltage.
13. ISENSE: Current sense output for monitoring the load current.
14. VSENSE: Voltage sense output for monitoring the output voltage.

Functional Features

• Voltage mode control with adjustable feedback loop compensation.
• Precise regulation of output voltage and current.
• Soft-start capability for controlled startup.
• Overvoltage and overcurrent protection for enhanced safety.
• Synchronization input for external clock synchronization.
• Undervoltage lockout to prevent operation at low input voltages.

Advantages and Disadvantages

Advantages: - High-performance controller for switch-mode power supplies. - Provides accurate regulation of output voltage/current. - Offers protection features for improved reliability. - Compact TSSOP-14 package for space-constrained applications. - Wide input and output voltage ranges for versatility.

Disadvantages: - Requires external components for complete functionality. - Limited maximum duty cycle of 90% may restrict certain applications. - Operating temperature range may not be suitable for extreme environments.

Working Principles

The UCC3819APWR is a voltage mode PWM controller that operates by comparing the feedback voltage (FB) with a reference voltage (VREF). The COMP pin is used to adjust the feedback control loop compensation, ensuring stable and precise regulation of the output voltage. The CS pin monitors the load current, enabling current limiting and overcurrent protection.

During startup, the soft-start feature gradually increases the duty cycle to prevent excessive inrush current. The UVLO pin ensures that the IC remains off when the input voltage is below a specified threshold. The OVP pin protects against overvoltage conditions by shutting down the PWM controller.

Detailed Application Field Plans

The UCC3819APWR is commonly used in various switch-mode power supply applications, including:

1. AC/DC Power Supplies: Provides voltage regulation and protection in power supply units for electronic devices.
2. LED Lighting: Controls the voltage and current in LED drivers, ensuring efficient and reliable operation.
3. Battery Chargers: Regulates the charging voltage and current in battery charging circuits.
4. DC-DC Converters: Enables efficient conversion of DC voltages for different applications, such as in automotive electronics.

Detailed and Complete Alternative Models

1. UCC3819ADR: Similar to UCC3819APWR but available in SOIC-14 package.
2. UCC3819AN: DIP-14 package variant of UCC3819APWR.
3. UCC3819PW: TSSOP-14 package with wider operating temperature range (-40°C to 125°C).

These alternative models offer similar functionality and characteristics, providing flexibility in choosing the most suitable option for specific applications.

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