uc2846n

電流模式pwm 控制器

產品信息

特性

• automatic feed forward compensation
• programmable pulse-by-pulse current limiting
• automatic symmetry correction in push-pull configuration
• enhanced load response characteristics
• parallel operation capability for modular power systems
• differential current sense amplifier with wide common mode range
• double pulse suppression
• 500ma (peak) totem-pole outputs
• ±1% bandgap reference
• under-voltage lockout
• soft start capability
• shutdown terminal
• 500khz operation

說明

the uc1846/7 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 improved 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 shut-down function is also available which can initiate either a complete shutdown with automatic restart or latch the supply off.