The UC3846 control IC 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
module,, 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 suppression, deadtime adjust capability, and
±2% trimmed bandgap reference. The UC3846 features low
outputs in the OFF state.