Current Mode PWM Controller

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.
Other features include fully latched operation, double pulse suppression, deadline adjust capability, and a 1% trimmed bandgap reference.
The UC1846 features low outputs in the OFF state, while the UC1847 features high outputs in the OFF state.
By Texas Instruments