The TS79L09CY is a three-terminal negative voltage regulator from Taiwan Semiconductor. It's designed to provide a fixed -9V output voltage, making it suitable for a variety of applications requiring a stable negative voltage source. This regulator is part of the TS79Lxx series, known for their simplicity and cost-effectiveness.

Applications:

• Power supplies: Providing regulated negative voltage for various electronic circuits.
• Instrumentation: Used in test and measurement equipment for stable voltage references.
• Linear regulation: Can be used as a post-regulator to improve ripple rejection.
• Microcontroller circuits: Providing a stable negative rail for analog circuitry.
• Educational projects: Its simplicity makes it ideal for students learning about voltage regulation.

Features:

• Fixed negative output voltage: Provides a stable -9V output.
• Internal short-circuit current limiting: Protects the regulator from damage due to short circuits.
• Thermal overload protection: Shuts down the regulator if the junction temperature exceeds safe limits.
• Output transistor safe-area compensation: Reduces stress on the output transistor.
• Available in a TO-92 package: Small and easy to mount.

Benefits:

• Simplified power supply design: Reduces the number of components needed for a negative voltage supply.
• Improved reliability: Built-in protection features enhance the overall system reliability.
• Cost-effective: Provides a low-cost solution for negative voltage regulation.
• Ease of use: Simple three-terminal configuration simplifies circuit design and prototyping.
• Stable Output: Provides a reliably consistent negative voltage.

Technical Specifications:

The TS79L09CY features an input voltage range typically from -11V to -25V. It delivers a regulated output voltage of -9V with a typical output current of 100mA. It's designed to operate over a temperature range of 0°C to +125°C. The TO-92 package allows for easy mounting on PCBs or breadboards. This regulator needs external capacitors to ensure stability. Values of 0.33uF on the input and 0.1uF on the output are typically recommended.