The SC1142D0-TL is a synchronous buck PWM controller manufactured by Power Integrations (formerly iWatt). It is designed to drive an external N-channel MOSFET in a step-down (buck) DC-DC converter application. The 'TL' suffix generally indicates tape and reel packaging.

Applications

• Notebook computers
• Desktop computers
• Graphics cards
• Set-top boxes
• Networking equipment
• Point-of-load (POL) converters

Features

• Synchronous buck PWM controller
• Drives external N-channel MOSFET
• Input voltage range typically up to 20V
• Adjustable output voltage
• Overcurrent protection
• Overtemperature protection
• Undervoltage lockout (UVLO)
• Soft-start function
• Small surface-mount package

Benefits

• High efficiency due to synchronous rectification
• Flexible output voltage adjustment
• Protection against overcurrent, overtemperature, and undervoltage
• Smooth and controlled startup with soft-start function
• Small size for space-constrained applications

Additional Details

The SC1142D0-TL utilizes Pulse-Width Modulation (PWM) to regulate the output voltage. The switching frequency is usually adjustable or fixed depending on the specific configuration. An external inductor and capacitor are required to complete the buck converter circuit. The overcurrent protection feature limits the output current to prevent damage to the MOSFET and other components. The overtemperature protection shuts down the controller if the temperature exceeds a certain threshold. The undervoltage lockout prevents the controller from operating if the input voltage is too low. The soft-start function gradually increases the output voltage during startup, reducing stress on the components and preventing inrush current. The SC1142D0-TL is designed to provide a high-performance and reliable solution for DC-DC conversion in a variety of applications. Refer to the Power Integrations datasheet for specific electrical characteristics, application circuits, and layout recommendations. The integrated protections and control features simplify the design process and enhance the reliability of the power supply.