Description

The UCC3915N is a Hot Swap Controller component categorized as an Electronic Component. This current-mode Pulse Width Modulated (PWM) controller contains control and protection functions necessary to have an offline, flyback or forward converter with minimum external components.

Specifications and Features

• Very low start-up supply current - 50 µA typical
• Low operating supply current - 1.2 mA typical
• Accurate, internally-trimmed, fixed frequency oscillator (100 kHz). No external timing components required
• Internal slope compensation - No external ramp components needed
• Built-in over-voltage and under-voltage detection
• High-speed over-current trip - 170 ns typical
• Over-voltage clamp on supply voltage (VDD)
• Internal divider regulates VDD to 12 V - No external divider needed
• Leading edge blanking of the current sense signal
• Control frequency modulated over a narrow band to reduce Electromagnetic Interference (EMI)
• High output drive capability - 150 ns typical rise and fall time into 2 nF load
• Wide bandwidth (10 MHz) error amplifier with external compensation pin and simple interface to optocoupler
• Accurate internal bandgap reference

Application Scenarios

The UCC3915N is suitable for the development of off-line switched mode power supplies, laptop computer mains adaptors, and printer power supplies.

Comparison

• Has little need for external components, thus reducing cost and system complexity
• Contains all the control and protection functions necessary to implement an off-line, flyback or forward converter
• Control frequency modulated over a narrow band to reduce Electromagnetic Interference (EMI)

• Not suitable for all types of electrical devices or electronic components
• Current-mode Pulse Width Modulation (PWM) controller is limited in terms of applications