ON NCP1612A3DR2G

Ток, управляемый частотным спадом (CCFF), критическая проводимость (CRM)

Overview

The NCP1612A3DR2G is designed to drive PFC boost stages based on an innovative Current Controlled Frequency Fold−back (CCFF) method. In this mode, the circuit classically operates in Critical conduction Mode (CrM) when the inductor current exceeds a programmable value. When the current is below this preset level, the NCP1612A3DR2G linearly decays the frequency down to about 20 kHz when the current is null. CCFF maximizes the efficiency at both nominal and light load. In particular, the stand−by losses are reduced to a minimum.

Safety • Separate Pin for Fast Over−Voltage Protection (FOVP) and Bulk Under−Voltage Detection (BUV)• Soft Over−Voltage Protection• Brown−Out Detection• Soft−Start for Smooth Start−up Operation (A version)• Over Current Limitation• Disable Protection if the Feedback and FOVP/BUV pins are not connected• Thermal Shutdown• Latched Off Capability• Low Duty−Cycle Operation if the Bypass Diode is shorted• Open Ground Pin Fault Monitoring

Features

Applications

• Switching regulator
• Multiple-power supply system
• Digital audio player
• Digital TV
• Smartcard
• Industrial equipment
• DVD and CD-ROM drive
• Quick charge protocols
• Measurement and control euipment
• Aging system