The UC1846/7 family of control devices 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 while maintaining equal current sharing. \
Protection circuitry includes built-in undervoltage 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 suppression, deadline
adjust capability, and a ±1% trimmed band gap reference.
The UC1846 features low outputs in the OFF state, while the UCx847 features high outputs
in the OFF state.