UC3846G 电子元器件 UTC 封装SOP-16W 电流模式PWM 控制器

　　DESCRIPTION

　　The UTC UC3846 control IC offers all necessary features for accomplishment of fixed frequency, current mode control functions, however it contains the least external parts. The performance of this technique is superior to the others in better line regulation, enhanced load response characteristics while designing a simpler and easier control loop for design. It owns topological advantages of inherent pulse-by-pulse current limiting, automatic symmetry correction for push-pull converters, and the ability to parallel “power modules" for equal current sharing. Protection loop includes soft start, built-in under-voltage lockout and programmable current limit. The shutdown circuitry can provide either a complete shutdown with automatic restart or the supply off-latch. In addition, many other features can also be available, including fully latched operation, double pulse suppression, deadline adjust, and a ±1% trimmed bandgap reference. The UTC UC3846 features low outputs in the OFF state.

　　FEATURES

　　Built-in under-voltage lockout

　　Soft start

　　Shutdown function

　　500kHZ operation

　　Feed forward compensation

　　±1% bandgap reference

　　Programmable pulse-by-pulse current limiting

　　Improved 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

　　Automatic symmetry correction in push-pull configuration