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.
|Vin (Min) (V)|
|Vin (Max) (V)|
|Frequency (Max) (kHz)|
|UVLO Thresholds On/Off (V)|
|Duty Cycle (Max) (%)|
|Gate Drive (Typ) (A)|
|Operating Temperature Range (C)|
| Boost |
| Adjustable Switching Frequency |
Dead Time Control
|0 to 70|
| 16PDIP |
|Military||UC1846||QML certified for Military and Defense Applications|
|Enhanced Product||UC1846-EP||Supports Defense, Aerospace and Medical Applications|
|Space||UC1846-SP||Radiation tolerant, ceramic packaging and qualified for use in Space-based application|