STMicroelectronics

L5991A

L5991A Description

The L5991A is a high-performance, flyback topology DC-DC switching controller manufactured by STMicroelectronics. With a maximum switching frequency of up to 1MHz, this device is designed to provide efficient power conversion in various applications. The L5991A features a positive, isolation-capable output configuration and is capable of operating with a supply voltage range of 7.6V to 20V. This product is RoHS3 compliant and REACH unaffected, ensuring compliance with environmental regulations. The L5991A is designed for through-hole mounting and is available in a 16DIP tube package.

L5991A Features

• Output Type: Transistor Driver
• Output Configuration: Positive, Isolation Capable
• Product Status: Obsolete (Note: This product is no longer in production, but may still be available through aftermarket suppliers)
• Frequency - Switching: Up to 1MHz
• REACH Status: REACH Unaffected
• Voltage - Supply (Vcc/Vdd): 7.6V to 20V
• RoHS Status: RoHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• Synchronous Rectifier: Yes
• ECCN: EAR99
• Topology: Flyback
• Mounting Type: Through Hole
• Clock Sync: No
• Number of Outputs: 1
• Control Features: Current Limit, Frequency Control, Soft Start
• Duty Cycle (Max): 93%
• Output Phases: 1
• HTSUS: 8542.39.0001
• Package: Tube
• Base Product Number: L5991

L5991A Applications

The L5991A is ideal for applications requiring efficient power conversion in a compact form factor. Some specific use cases include:

1. Telecommunications Equipment: Powering electronic components in telephones, modems, and other communication devices.
2. Industrial Control Systems: Providing stable power to control panels, sensors, and actuators in industrial automation systems.
3. Medical Devices: Powering low-voltage electronic components in medical equipment, such as patient monitors and diagnostic devices.
4. Consumer Electronics: Powering portable devices like smartphones, tablets, and wearables.

Conclusion of L5991A

The L5991A is a versatile and efficient DC-DC switching controller designed for a wide range of applications. Its unique features, such as a high switching frequency, isolation capability, and RoHS3 compliance, make it an attractive option for engineers looking to optimize power conversion in their designs. While the product is now considered obsolete, it remains a reliable choice for existing systems and can still be sourced through aftermarket suppliers.