SI9122A

Si9122A Vishay Siliconix 500-kHz Half-Bridge DC/DC Controller With Integrated Secondary Synchronous Rectification Drivers FEATURES D D D D D D D D 28-V to 75-V Input Voltage Range Compatible with ETSI 300 132-2 Integrated "1–A Half Bridge Primary Drivers Secondary Synchronous Rectifier Control Signals With Programmable Deadtime Delay Voltage Mode Control Voltage Feedforward Compensation High Voltage Pre-Regulator Operates During Start-Up Current Sensing On Low-Side Primary Device D Frequency Foldback Eliminates Constant Current Tail D Advanced Maximum Current Control During Start-Up and Shorted Load D Low Input Voltage Detection D Programmable Soft-Start Function D Over Temperature Protection APPLICATIONS D Network Cards D Power Supply Modules DESCRIPTION Si9122A is a half-bridge controller IC ideally suited to fixed telecom applications where high efficiency is required at low output voltages (e.g.