UCC3817NG4

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Mode PWM Controller
• Characteristics: High-performance, versatile, and efficient
• Package: PDIP-16 (Plastic Dual In-Line Package)
• Essence: Control and regulation of voltage in power electronic systems
• Packaging/Quantity: Available in reels or tubes, quantity varies based on supplier

Specifications

• Input Voltage Range: 3V to 40V
• Output Voltage Range: 0.8V to 5.5V
• Operating Temperature Range: -40°C to 85°C
• Maximum Duty Cycle: 100%
• Oscillator Frequency Range: 50kHz to 1MHz
• Output Current: Up to 500mA
• Error Amplifier Bandwidth: 10MHz

Detailed Pin Configuration

The UCC3817NG4 has a total of 16 pins. The pin configuration is as follows:

1. COMP: Compensation pin for the error amplifier.
2. FB: Feedback pin for regulating the output voltage.
3. VREF: Reference voltage input 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. VCC: Positive supply voltage input pin.
9. SYNC: Synchronization input pin.
10. OSC: Oscillator timing capacitor connection pin.
11. SS/TR: Soft-start and tracking pin.
12. CS: Current sense input pin.
13. DRVH: High-side gate driver output pin.
14. DRVL: Low-side gate driver output pin.
15. VSENSE: Voltage sense input pin.
16. VOUT: Regulated output voltage pin.

Functional Features

• Voltage mode control with adjustable frequency and duty cycle.
• Error amplifier with high bandwidth for precise regulation.
• Soft-start and tracking function for controlled startup.
• Synchronization input for external clock synchronization.
• Current sense input for accurate current limiting.
• Integrated gate drivers for driving external power MOSFETs.

Advantages and Disadvantages

Advantages: - High-performance voltage mode control for efficient power regulation. - Versatile frequency and duty cycle adjustment for various applications. - Integrated gate drivers simplify the design of power electronic systems. - Wide input and output voltage range for flexibility in different scenarios.

Disadvantages: - Limited maximum output current compared to specialized controllers. - Requires external components for proper operation. - Not suitable for applications requiring extremely high switching frequencies.

Working Principles

The UCC3817NG4 operates as a voltage mode PWM controller. It compares the feedback voltage (FB) with a reference voltage (VREF) and generates an error signal. This error signal is amplified by the error amplifier and used to adjust the duty cycle of the PWM signal. The PWM signal controls the power switches (MOSFETs) through the gate drivers, regulating the output voltage. The oscillator sets the frequency of the PWM signal, which can be adjusted using external timing components connected to the RT/CT pins.

Detailed Application Field Plans

The UCC3817NG4 is commonly used in various power electronic applications, including:

1. Switching Power Supplies: Used to regulate the output voltage in AC-DC or DC-DC power supplies.
2. Motor Control: Controls the speed and direction of motors in industrial and automotive applications.
3. LED Lighting: Regulates the current in LED lighting systems for efficient and dimmable operation.
4. Battery Charging: Manages the charging process of batteries in portable devices or electric vehicles.
5. Solar Power Systems: Controls the power conversion and regulation in solar energy harvesting systems.

Detailed and Complete Alternative Models

1. UC3842: Similar voltage mode PWM controller with adjustable frequency and duty cycle.
2. TL494: PWM controller with integrated error amplifier and multiple outputs.
3. SG3525: PWM controller with built-in oscillator and dead-time control.
4. LT1241: High-performance PWM controller with wide input voltage range.
5. MC34063A: Low-cost PWM controller suitable for simple power supply designs.

(Note: These alternative models may have different pin configurations and specifications, so careful consideration is required when selecting an alternative.)

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