描述 Description

The NCP1028 offers a new solution targeting output power levels from a few watts up to 15W in a universal mains flyback application.Our proprietary high-voltage technology lets us include a power MOSFET together with a startup current source, all directly connected to the bulk capacitor. To prevent lethal runaway in low input voltage conditions, an adjustable brown-out circuitry blocks the activity until sufficient input level is reached.Current-mode operation together with an adjustable ramp compensation offers superior performance in universal mains applications.Protection wise, a timer detects an overload or a short-circuit and stops all operations, ensuring a safe auto-recovery, low duty cycle burst operation. An integrated, auto-recovery.Finally, a great RDS(on) figure makes the circuit anexcellent choice for standby/auxiliary offline power supplies or applications requiring higher output power levels.

特性 Features

Skips cycles on low power demand
Provides improved efficiency at light loadsNo acoustic noise
Short circuit protection independent of the AUX winding
Efficient protective circuitryEase the design
Overpower protection
Effect of the input voltage variation on the max power delivered is compensated
Built-in 700 V MOSFET with Typical RDS(on) of 5.8 , Tj = 25C
Fixed Peak Current of 800 mA
Internal Current Source for Clean and Lossless Startup Sequence
Programmable Brown-Out Input for Low Input Voltage Detection
Input to Permanently Latchoff the Part
Internal Frequency Jittering for Improved EMI Signature
No-Load Input Standby Power of 85 mW @ 265 Vac
500 mW Loaded, Input Power of 715 mW @ 230 Vac
Programmable Over Power Protection
Medium Power AC-DC power supply for CE apparatus

應(yīng)用 Application

Medium Power AC-DC Adapters for ChargersAuxiliary power supply
Desktop PCFlat TVsDVD, STB

簡介

NCP1028屬于集成電路（IC）的ACDC轉(zhuǎn)換器離線開關(guān)。由制造生產(chǎn)的NCP1028AC DC 轉(zhuǎn)換器，離線開關(guān)該系列是元器件級控制產(chǎn)品，用于構(gòu)建將交流市電轉(zhuǎn)換為直流電（通常電壓大幅降低）的設(shè)備。集成和未集成系統(tǒng)主要開關(guān)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(shí)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(guān)轉(zhuǎn)換器，SMPS 變壓器”標(biāo)題。