代理產線

UCC28700

 2014-10-29

【基本資料】

【產品特性】

• Allows 5 star EC IPP rating for no-load stand-by power
• Enables high power density charger designs by reducing magnetics size
• Eases EMI compliance to EM60950 requirements by spreading the spectrum of the switching frequency
• Allows use of a small bias capacitor, also increasing power density

【產品應用】

• AC/DC Power Supplies
• Cell phone charger
• Camera charger
• Tablet charger

【文字介紹】

The UCC28700 family of flyback power supply controllers provides Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices process information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current. Low start-up current, dynamically-controlled operating states and a tailored modulation profile support very low stand-by power without sacrificing start-up time or output transient response.

Control algorithms in the UCC28700 family allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a MOSFET power switch. Discontinuous Conduction Mode (DCM) with valley switching reduces switching losses. Modulation of switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.