描述 Description

Key Features:
? Automatic feed forward compensation
? Programmable pulse by pulse current limiting
? Automatic symmetry correction in push-pullconfiguration
? Enhanced load response characteristics
? Parallel operation capability for modular powersystems
? Differential current sense amplifier with widecommon mode range
? Double pulse suppression
? 200mA totem-pole outputs
? ± 1% bandgap reference
? Under-voltage lockout
? Soft-start capability
? Shutdown capability
? 500KHz operationThe SG1846 family of control ICs provides all of the necessary features to implement fixed frequency, current mode control schemes while maintaining a minimum external parts count. The superior performance of this technique can be measured in im-proved line regulation, enhanced load response characteristics, and a simpler, easier-to-design control loop. Topological advantages include inherent pulse-by-pulse current limiting capability, automatic symmetry correction for push-pull converters, and the ability to parallel “power modules” while maintaining equal current sharing.Protection circuitry includes built-in under-voltage lockout and programmable current limit in addition to soft start capability. A shutdown function is also available which can initiate either a complete shutdown with automatic restart or latch the supply off.Other features include fully latched operation, double pulse sup-pression, deadtime adjust capability, and a ±1% trimmed bandgap reference.