描述 Description

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(9 – 120/200 V MSOP10/WQFN10) and supplying at least 20 mA to provide temporary bias to VCC during system startup.
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.

特性 Features

? Wide Input Range (9 – 120/200 V; MSOP10/WQFN10)
? Simplify design and reduce BOM cost
? Current Mode Control with Integrated Slope Compensation
? No sub-harmonic oscillation in CCM mode .
? Single Resistor Programmable Oscillator
? Easy and flexible
? 1 A / 2.8 A Source / Sink Gate Driver
? Drive any type of MOSFET's
? Input Voltage UVLO with Hysteresis
? To protect the design or bring the controller into a low quiescent state
? Several Fault Protections:- User Adjustable Over-Power Protection- Overload Protection with 30 ms Overload Timer- NTC-Compatible Fault Interface for Thermal Protection- Output OVP Fault Interface
? Robust and safe design

應用 Application

? Low to medium voltage isolated DC-DC
? CCM & DCM Flyback Converters
? Forward converters
? Telecom DC-DC Modules
? Industrial power converters
? Railway DC-DC Modules

簡介

NCP12700屬于集成電路（IC）的ACDC轉換器離線開關。由制造生產(chǎn)的NCP12700AC DC 轉換器，離線開關該系列是元器件級控制產(chǎn)品，用于構建將交流市電轉換為直流電（通常電壓大幅降低）的設備。集成和未集成系統(tǒng)主要開關元件的器件均包括在內(nèi)。由于高輸入輸出電壓比，以及此類系統(tǒng)中通常需要隔離，這些器件通常與外部變壓器配合使用。盡管通常使用定制變壓器來實現(xiàn)此用途，但也有許多專門用于此用途的庫存產(chǎn)品，請參見“開關轉換器，SMPS 變壓器”標題。