Description

The UCC3912DPTR is a hot swap controller designed to protect equipment from excessive inrush currents during power-up and short circuit conditions. It contains all the necessary control and protection functions needed to implement a hot swap design with a minimal number of external components.

Specifications and features

Start-up supply current: 50 µA typical
Operating supply current: 1.2 mA typical
Oscillator: Accurate, internally-trimmed, fixed frequency oscillator (100 kHz). No external timing components needed
Protection functions: Over-voltage and under-voltage detection, high-speed over-current trip, over-voltage clamp on supply voltage (VDD)
Output drive capability: High output drive capability; 150 ns typical rise and fall time into 2 nF load
Applications: Off-line switched mode power supplies, laptop computer mains adaptors, printer power supplies.

Application Scenarios

The UCC3912DPTR is typically used in electronic devices that require protection against inrush currents during power-up and short circuit conditions. It is commonly used in off-line switched mode power supplies, laptop computer mains adaptors, and printer power supplies.

Comparison

• Contains all necessary control and protection functions in a single component
• Accurate and internally-trimmed oscillator eliminates the need for external timing components
• Built-in over-voltage and under-voltage detection and high-speed over-current trip provide robust protection to equipment
• High output drive capability allows for efficient power delivery to the load
• Accurate internal bandgap reference ensures stable operation over a wide range of operating conditions

• May not be suitable for applications that require very high output drive capability or extremely precise control over the hot swap process
• May require additional external components for some applications, such as snubber circuits for reducing electromagnetic interference (EMI)