UC3871NG4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: High Efficiency, Low Power Consumption
• Package: DIP (Dual In-line Package)
• Essence: Voltage Mode PWM Controller
• Packaging/Quantity: Tube/25 pieces

Specifications

• Input Voltage Range: 8V to 40V
• Output Voltage Range: 0.8V to 36V
• Maximum Duty Cycle: 100%
• Operating Temperature Range: -40°C to +85°C
• Frequency Range: 50kHz to 1MHz
• Output Current: Up to 1A
• Quiescent Current: 5mA

Detailed Pin Configuration

1. VCC: Power Supply Input
2. GND: Ground
3. COMP: Compensation Pin
4. FB: Feedback Pin
5. CS: Current Sense Pin
6. RT/CT: Timing Components Connection
7. SYNC: Synchronization Input
8. SS/TR: Soft-Start and Shutdown Control Pin
9. OUT: Output Pin
10. INV: Inverting Input
11. NC: No Connection

Functional Features

• Voltage Mode PWM Control
• Adjustable Output Voltage
• Overcurrent Protection
• Overvoltage Protection
• Undervoltage Lockout
• Soft-Start Function
• Synchronization Capability
• Error Amplifier with High Gain Bandwidth

Advantages

• High Efficiency Power Conversion
• Wide Input Voltage Range
• Flexible Output Voltage Adjustment
• Robust Overcurrent and Overvoltage Protection
• Reliable Undervoltage Lockout
• Smooth Startup with Soft-Start Function
• Synchronization Capability for Multi-Phase Operation
• Accurate Error Amplifier for Precise Regulation

Disadvantages

• Limited Output Current (Up to 1A)
• Requires External Timing Components
• DIP Package may limit PCB space efficiency

Working Principles

The UC3871NG4 is a voltage mode PWM controller designed for power management applications. It operates by comparing the feedback voltage with a reference voltage to generate a control signal that adjusts the duty cycle of the output waveform. This control signal regulates the output voltage by controlling the switching of an external power MOSFET.

The IC incorporates various protection features such as overcurrent and overvoltage protection, ensuring safe operation under abnormal conditions. It also includes an undervoltage lockout circuit that prevents the device from operating when the input voltage falls below a certain threshold.

The soft-start function gradually increases the duty cycle during startup, preventing excessive inrush current and minimizing stress on the components. The synchronization capability allows multiple UC3871NG4 controllers to operate in a synchronized manner, enabling multi-phase power conversion for higher power applications.

Detailed Application Field Plans

The UC3871NG4 is commonly used in various power management applications, including:

1. DC-DC Converters: The IC can be employed in buck, boost, or buck-boost converters to efficiently regulate the output voltage for different loads.
2. LED Lighting: It can be utilized in LED drivers to provide constant current or constant voltage output for driving LEDs.
3. Battery Chargers: The IC can be integrated into battery charging circuits to control the charging process and protect the battery from overcharging or overdischarging.
4. Industrial Power Supplies: It finds application in industrial power supplies for controlling and regulating the output voltage and current.

Detailed and Complete Alternative Models

1. UC3871N: Similar specifications and functionality, but available in a different package (PDIP).
2. UC3871DW: Surface mount package (SOIC) alternative with the same specifications and features.
3. UC3871Q: Enhanced version with additional protection features and wider operating temperature range.

Note: The above alternative models are provided as examples and may not represent an exhaustive list of alternatives available in the market.

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