UCC3817DWG4

Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Mode PWM Controller
• Characteristics: High-performance, low-power, wide input voltage range
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Control and regulation of power supply systems
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 4.5V to 75V
• Output Voltage Range: 2.5V to 60V
• Operating Temperature Range: -40°C to 85°C
• Switching Frequency: Up to 1MHz
• Duty Cycle Range: 0% to 100%
• Output Current: Up to 500mA

Pin Configuration

The UCC3817DWG4 has a total of 16 pins arranged as follows:

1. COMP: Compensation pin for feedback control loop.
2. FB: Feedback pin for output voltage regulation.
3. VREF: Reference voltage output pin.
4. RT/CT: Timing components connection pin.
5. CT: Timing capacitor connection pin.
6. RT: Timing resistor connection pin.
7. GND: Ground reference pin.
8. SS/TR: Soft-start and tracking pin.
9. TR: Tracking input pin.
10. SS: Soft-start capacitor connection pin.
11. VCC: Power supply voltage input pin.
12. SYNC: Synchronization input pin.
13. OSC: Oscillator timing capacitor connection pin.
14. OSC: Oscillator timing resistor connection pin.
15. DRVH: High-side gate driver output pin.
16. DRVL: Low-side gate driver output pin.

Functional Features

• Voltage mode control with adjustable duty cycle.
• Adaptive dead-time control for efficient switching.
• Overcurrent protection with adjustable threshold.
• Soft-start and tracking capability for controlled startup.
• Synchronization input for multi-phase operation.
• Error amplifier with adjustable gain and compensation.

Advantages

• Wide input voltage range allows for versatile applications.
• High-performance control algorithm ensures efficient power conversion.
• Low-power consumption for energy-efficient designs.
• Adaptive dead-time control minimizes switching losses.
• Overcurrent protection enhances system reliability.
• Soft-start feature prevents inrush current during startup.

Disadvantages

• Limited output current capability (up to 500mA).
• Requires external timing components for operation.
• Sensitive to noise and voltage fluctuations.
• Not suitable for high-frequency applications.

Working Principles

The UCC3817DWG4 is a voltage mode PWM controller used for regulating power supply systems. It operates by comparing the feedback voltage (FB) with a reference voltage (VREF) to generate an error signal. This error signal is then amplified and compensated to drive the gate drivers, controlling the duty cycle of the power switch. By adjusting the duty cycle, the output voltage can be regulated within the desired range. The controller also incorporates features like adaptive dead-time control, soft-start, and overcurrent protection to ensure efficient and reliable operation.

Application Field Plans

The UCC3817DWG4 finds extensive use in various applications, including:

1. Switching Power Supplies: Used in AC/DC converters, DC/DC converters, and other power supply systems requiring voltage regulation.
2. LED Lighting: Enables efficient control of LED driver circuits for lighting applications.
3. Industrial Automation: Provides precise control of motor drives, inverters, and other industrial equipment.
4. Telecommunications: Used in telecom power supplies, base stations, and communication systems.
5. Automotive Electronics: Suitable for automotive power management, battery chargers, and electric vehicle applications.

Alternative Models

For those seeking alternative options, the following models can be considered:

1. UCC3817D: Similar specifications and features, but in a different package (SOIC-8).
2. UCC3817ADR: Same specifications and features, but with a different reel packaging/quantity (Reel of 3000 units).

These alternative models offer similar functionality and can be used as drop-in replacements for the UCC3817DWG4.

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