UC3825N

Product Overview

• Category: Integrated Circuit (IC)
• Use: PWM Controller
• Characteristics: High-performance, versatile, and efficient
• Package: DIP (Dual In-line Package)
• Essence: Regulates the output voltage of power supplies
• Packaging/Quantity: Available in tubes or reels, quantity varies based on supplier

Specifications

• Input Voltage Range: 8V to 35V
• Output Voltage Range: 0V to 5.1V
• Maximum Duty Cycle: 100%
• Operating Temperature Range: -40°C to +85°C
• Frequency Range: 50kHz to 500kHz
• Output Current: Up to 1A
• Supply Current: 10mA

Detailed Pin Configuration

The UC3825N has a total of 16 pins. Here is the detailed pin configuration:

1. VREF: Reference voltage input
2. COMP: Error amplifier output
3. FB: Feedback input for regulating the output voltage
4. RT/CT: Timing resistor/capacitor connection
5. CT: Timing capacitor connection
6. RT: Timing resistor connection
7. OSC: Oscillator timing capacitor connection
8. GND: Ground reference
9. SYNC: Synchronization input
10. VCC: Power supply voltage input
11. OUT: Output pin
12. NC: No connection
13. NC: No connection
14. NC: No connection
15. NC: No connection
16. NC: No connection

Functional Features

• High-frequency operation for efficient power conversion
• Adjustable duty cycle for precise control
• Soft-start capability to reduce inrush current
• Overcurrent protection for enhanced safety
• Under-voltage lockout to prevent damage during low voltage conditions
• Error amplifier for accurate voltage regulation

Advantages and Disadvantages

Advantages: - High-performance and versatile PWM controller - Efficient power conversion - Precise voltage regulation - Enhanced safety features

Disadvantages: - Limited output current capacity (up to 1A) - Requires external components for complete power supply design

Working Principles

The UC3825N is a pulse-width modulation (PWM) controller that regulates the output voltage of power supplies. It operates by comparing a feedback voltage with a reference voltage and adjusting the duty cycle of the output waveform accordingly. By controlling the on/off time of the power switch, it achieves precise voltage regulation.

The error amplifier compares the feedback voltage with the reference voltage and generates an error signal. This signal is then fed into the PWM comparator, which compares it with a sawtooth waveform generated by the oscillator. The resulting PWM signal controls the power switch, adjusting the duty cycle to maintain the desired output voltage.

Detailed Application Field Plans

The UC3825N is widely used in various applications, including:

1. Switching Power Supplies: Used to regulate the output voltage in AC-DC and DC-DC power supplies.
2. LED Lighting: Controls the brightness of LEDs in lighting systems.
3. Motor Control: Regulates the speed and direction of motors in industrial and automotive applications.
4. Battery Chargers: Manages the charging process of batteries in portable devices and electric vehicles.
5. Audio Amplifiers: Controls the power output of audio amplifiers for improved efficiency.

Detailed and Complete Alternative Models

1. UC3825AN: Similar to UC3825N but with extended temperature range (-40°C to +125°C).
2. UC3845N: Higher output current capacity (up to 2A) and wider input voltage range (7V to 30V).
3. UC3842N: Lower output current capacity (up to 0.5A) and narrower input voltage range (8V to 18V).
4. UC3843N: Higher output current capacity (up to 1.5A) and wider input voltage range (7V to 30V).

These alternative models offer similar functionality with slight variations in specifications, catering to different application requirements.

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