Texas Instruments
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UC3848N
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UC3848N

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Power Management
  • Characteristics: High-performance PWM Controller
  • Package: DIP-16 (Dual In-line Package with 16 pins)
  • Essence: Regulates and controls the power supply in various applications
  • Packaging/Quantity: Available in reels of 2500 units

Specifications

  • Input Voltage: 10V to 30V
  • Output Voltage: Adjustable, typically up to 20V
  • Operating Temperature: -40°C to +85°C
  • Switching Frequency: 100kHz to 1MHz
  • Maximum Duty Cycle: 50%
  • Protection Features: Overvoltage, Undervoltage, Overcurrent

Pin Configuration

The UC3848N IC has a total of 16 pins arranged as follows:

  1. VREF: Reference voltage input
  2. COMP: Error amplifier output
  3. FB: Feedback pin for regulating the output voltage
  4. RT/CT: Timing components 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: Positive power supply input
  11. DRV: Gate driver output
  12. OUT: Power switch output
  13. CS: Current sense input
  14. SS: Soft-start control input
  15. UVLO: Undervoltage lockout input
  16. OVLO: Overvoltage lockout input

Functional Features

  • High-performance pulse-width modulation (PWM) controller
  • Provides precise regulation and control of power supply
  • Supports adjustable output voltage
  • Wide input voltage range for versatile applications
  • Protection features ensure safe operation
  • Synchronization input for multi-phase operation
  • Soft-start control for smooth power-up

Advantages and Disadvantages

Advantages

  • High-performance and reliable power management solution
  • Flexible output voltage adjustment
  • Wide operating temperature range
  • Comprehensive protection features
  • Suitable for various applications

Disadvantages

  • Limited maximum duty cycle (50%)
  • Requires external timing components for operation

Working Principles

The UC3848N is a high-performance PWM controller that regulates and controls the power supply in various applications. It operates by comparing the feedback voltage with a reference voltage to generate an error signal. This error signal is then amplified and used to adjust the duty cycle of the PWM waveform, which controls the output voltage.

The IC incorporates protection features such as overvoltage, undervoltage, and overcurrent protection to ensure safe operation. It also supports synchronization input for multi-phase operation and soft-start control for smooth power-up.

Application Field Plans

The UC3848N is widely used in power management applications, including:

  1. Switching Power Supplies
  2. DC-DC Converters
  3. Battery Chargers
  4. LED Drivers
  5. Motor Control Systems

Its versatility and high-performance characteristics make it suitable for various industries, including telecommunications, automotive, industrial automation, and consumer electronics.

Alternative Models

Here are some alternative models that can be considered as replacements for the UC3848N:

  1. UC3842N
  2. UC3843N
  3. UC3844N
  4. UC3845N
  5. UC3846N

These models offer similar functionality and characteristics, providing options for different design requirements.

In conclusion, the UC3848N is a high-performance PWM controller used in power management applications. Its adjustable output voltage, comprehensive protection features, and wide operating temperature range make it a reliable choice for various industries.

Énumérez 10 questions et réponses courantes liées à l'application de UC3848N dans les solutions techniques

Sure! Here are 10 common questions and answers related to the application of UC3848N in technical solutions:

  1. Q: What is UC3848N? A: UC3848N is a high-performance current mode PWM controller used in power supply applications.

  2. Q: What are the key features of UC3848N? A: The key features of UC3848N include adjustable frequency, soft-start capability, cycle-by-cycle current limiting, and built-in protection features.

  3. Q: How does UC3848N control the output voltage? A: UC3848N controls the output voltage by adjusting the duty cycle of the PWM signal based on the feedback received from the output voltage sensing circuit.

  4. Q: Can UC3848N be used in both buck and boost converter topologies? A: Yes, UC3848N can be used in both buck and boost converter topologies, as well as in flyback and forward converter configurations.

  5. Q: What is the maximum operating frequency of UC3848N? A: The maximum operating frequency of UC3848N is typically around 500 kHz.

  6. Q: How does UC3848N provide soft-start functionality? A: UC3848N provides soft-start functionality by gradually increasing the duty cycle during startup, preventing excessive inrush current and voltage overshoot.

  7. Q: Does UC3848N have any protection features? A: Yes, UC3848N has built-in protection features such as overvoltage protection (OVP), undervoltage lockout (UVLO), and thermal shutdown.

  8. Q: Can UC3848N operate with wide input voltage ranges? A: Yes, UC3848N can operate with wide input voltage ranges, typically up to 100V.

  9. Q: What is the maximum output current that UC3848N can handle? A: The maximum output current that UC3848N can handle depends on the external components used in the power supply design. It is typically in the range of several amps.

  10. Q: Are there any application notes or reference designs available for UC3848N? A: Yes, the manufacturer of UC3848N provides application notes and reference designs that can help in implementing the controller in various power supply applications.