onsemi NCP12700BDNR2G

The NCP12700 is a fixed frequency, peak current mode, PWM controller containing all of the features necessary for implementing single−ended power converter topologies. The device features a high voltage startup capable of operating over a wide input range and supplying at least 15 mA to provide temporary bias to VCC during system startup. The device contains a programmable oscillator capable of operating from 100 kHz to 1 MHz and integrates slope compensation to prevent subharmonic oscillations. The controller offers an adjustable soft−start, input voltage UVLO protection, and an adjustable Over−Power Protection circuit which limits the total power capability of the circuit as the input voltage increases, easing the system thermal design. The UVLO pin also features a shutdown comparator which allows for an external signal to disable switching and bring the controller into a low quiescent state. The NCP12700 contains a suite of protection features including cycle−by−cycle peak current limiting, timer−based overload protection, and a FLT pin which can be interfaced with an NTC and an auxiliary winding to provide system thermal protection and output over−voltage protection. All protection features place the device into a low quiescent fault mode and recovery from fault mode is dependent on the device option.

• Wide Input Range (9 – 120/200 V; MSOP10/WQFN10)
• Startup Regulator Circuit with 15 mA Capability
• Current Mode Control with Integrated Slope Compensation
• Suitable for Flyback or Forward Converters
• Single Resistor Programmable Oscillator
• 1 A / 2.8 A Source / Sink Gate Driver
• User Adjustable Soft−Start Ramp
• Input Voltage UVLO with Hysteresis
• Shutdown Threshold for External Disable
• Skip Cycle Mode for Low Standby Power
• This is a Pb−Free Device
• User Adjustable Over−Power Protection
• Overload Protection with 30 ms Overload Timer
• NTC−Compatible Fault Interface for Thermal Protection
• Output OVP Fault Interface
• Fault Auto−recovery Mode with 1 s Auto−recovery Period

• Single−ended Power Converters including CCM/DCM Flyback and Forward Converters
• Telecommunications Power Converters
• Industrial Power Converter Modules
• Transportation & Railway Power Modules