The CJ79L09 is a three-terminal negative voltage regulator manufactured by Jiangsu Changjiang Electronics Technology Co., Ltd (JCET). It provides a fixed -9V output voltage and is commonly used in a variety of electronic circuits requiring a stable negative power supply. This series of regulators are designed for local, on-card regulation and are known for their simplicity and reliability.

Applications:

• Negative Voltage Regulators: Providing a stable -9V supply for analog circuits, op-amps, and other components.
• Local Regulation: On-card regulation to reduce noise and improve power supply stability.
• Instrumentation: Powering sensitive instrumentation circuits that require a precise negative voltage.
• Industrial Control Systems: Used in various industrial control applications requiring a negative voltage supply.
• Linear Power Supplies: Provides a regulated negative voltage in linear power supply designs.

Features:

• Fixed -9V Output: Provides a stable and accurate -9V output voltage.
• Internal Short-Circuit Current Limiting: Protects the regulator and the connected circuitry from damage due to short circuits.
• Thermal Overload Protection: Prevents the regulator from overheating and causing damage.
• No External Components Required: Simplifies circuit design and reduces component count.
• Cost-Effective: Provides a low-cost solution for negative voltage regulation.

Benefits:

• Stable Negative Voltage: Provides a reliable and consistent -9V power supply.
• Protection Features: Short-circuit and thermal overload protection ensure safe and reliable operation.
• Simple to Use: Requires minimal external components for operation.
• Cost-Effective Solution: Offers a low-cost option for negative voltage regulation.
• Compact Design: Suitable for applications where space is limited.

Additional Details:

The CJ79L09 requires only minimal external components for proper operation. Input and output capacitors are typically used to improve stability and transient response. The regulator has built-in short-circuit current limiting and thermal overload protection to prevent damage in fault conditions. Consult the datasheet for detailed specifications, including input voltage range, output current capability, and recommended external component values.