L200 - Monolithic Integrated Voltage Regulator

Overview

The L200 is a monolithic integrated circuit designed for voltage regulation, offering a versatile solution for a wide range of power supply applications. This IC provides adjustable output voltage and current limiting, making it suitable for both fixed and variable power supply designs. The L200 is known for its robust performance, ease of use, and reliability in demanding environments.

With its built-in thermal overload protection and short-circuit protection, the L200 ensures safe operation under various conditions. The device is designed to deliver stable and precise voltage regulation, making it ideal for use in industrial, consumer, and automotive applications.

Features

• Adjustable Output Voltage: The output voltage can be set from 2.85V to 36V, providing flexibility for various applications.
• Adjustable Current Limiting: The current limit can be programmed to protect the circuit and connected components.
• Thermal Overload Protection: Built-in protection prevents damage due to excessive temperature.
• Short-Circuit Protection: Safeguards the regulator and load in case of a short circuit.
• Low Dropout Voltage: Ensures efficient operation even with small differences between input and output voltages.
• Wide Input Voltage Range: Operates with input voltages up to 40V, accommodating various power sources.
• High Ripple Rejection: Minimizes noise and ripple in the output voltage for clean power delivery.

Applications

The L200 is widely used in applications requiring precise voltage regulation and current control. Some common applications include:

• Bench Power Supplies: Adjustable voltage and current limits make the L200 ideal for laboratory and benchtop power supplies.
• Battery Chargers: The adjustable current limiting feature is useful for charging batteries safely and efficiently.
• Industrial Control Systems: Provides stable voltage for sensors, actuators, and control circuits.
• Automotive Electronics: Suitable for in-vehicle power supplies due to its wide input voltage range and protection features.
• Consumer Electronics: Used in devices requiring regulated power, such as audio amplifiers and portable gadgets.

Electrical Characteristics

The following table summarizes the key electrical specifications of the L200 under typical operating conditions (unless otherwise noted):

• Input Voltage Range: 4V to 40V
• Output Voltage Range: 2.85V to 36V (adjustable)
• Output Current: Up to 2A (with proper heat sinking)
• Dropout Voltage: 0.45V (typical) at 1A load
• Line Regulation: 0.01%/V (typical)
• Load Regulation: 0.1% (typical)
• Ripple Rejection: 60dB (typical) at 1kHz
• Operating Temperature Range: -40°C to +125°C

Thermal Characteristics

• Thermal Resistance (Junction-to-Case): 3°C/W
• Thermal Resistance (Junction-to-Ambient): 50°C/W (without heat sink)

Package Information

The L200 is available in several package options to suit different application requirements. The most common packages include:

• TO-220: A through-hole package with good thermal performance, suitable for applications requiring heat sinking.
• TO-220FP (Isolated): Similar to TO-220 but with an isolated tab for improved safety in high-voltage applications.
• D²PAK (TO-263): A surface-mount package designed for high-power applications with efficient heat dissipation.

Pin Configuration (TO-220 Package)

• Pin 1 (Input): Connects to the input voltage source.
• Pin 2 (Current Limit): Used to set the maximum output current.
• Pin 3 (Voltage Reference): Provides a stable reference voltage for regulation.
• Pin 4 (Ground): Connected to the system ground.
• Pin 5 (Output): Delivers the regulated output voltage.

Design Considerations

When designing with the L200, consider the following to ensure optimal performance:

• Heat Sinking: For high-current applications, a heat sink is recommended to dissipate excess heat and prevent thermal shutdown.
• Input Capacitor: A capacitor (typically 0.1µF to 1µF) near the input pin helps reduce noise and improve stability.
• Output Capacitor: A capacitor (10µF or higher) at the output improves transient response and stability.
• Current Limiting Resistor: A resistor connected to Pin 2 sets the current limit. Calculate its value based on the desired current limit using the formula: R_CL = 0.45V / I_LIM.
• Voltage Adjustment: Use a potentiometer or resistor divider network between the output and Pin 3 to set the desired output voltage.

Conclusion

The L200 is a highly versatile and reliable voltage regulator IC, offering adjustable voltage and current limiting with robust protection features. Its wide input voltage range, thermal protection, and ease of use make it suitable for a variety of applications, from industrial systems to consumer electronics. By following proper design practices, engineers can leverage the L200 to create efficient and stable power supply solutions.