Full Featured Voltage Mode PWM Controller

The NCP1560 PWM controller contains all the features and flexibility needed to implement voltage−mode control in high performance single ended DC−DC converters. This device cost effectively reduces system part count with the inclusion of a high voltage startup regulator that operates over a wide input range of 21.5 V to 150 V. The NCP1560 provides two control outputs, OUT1 which controls the main PWM switch and OUT2 with adjustable overlap delay, which can control a synchronous rectifier switch or an active clamp/reset switch. Other distinctive features include: two mode over current protection, line under/overvoltage lockout, fast line feedforward, soft−start and a maximum duty cycle limit.

FEATUREs
• Minimum Operating Voltage of 21.5 V
• Internal High Voltage Startup Regulator
• Dual Control Outputs with Adjustable Overlap Delay
• Single Resistor Oscillator Frequency Setting
• Fast Line Feedforward
• Line Under/Overvoltage Lockout
• Dual Mode Overcurrent Protection
• Programmable Maximum Duty Cycle Control
• Maximum Duty Cycle Proportional to Line Voltage
• Programmable Soft−Start
• Precision 5.0 V Reference
• Pb−Free Package is Available*

Typical Applications
• Telecommunication Power Converters
• Industrial Power Converters
• High Voltage Power Modules
• +42 V Automotive Systems
• Control Driven Synchronous Rectifier Power Converters