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.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | UCx846/7 Current Mode PWM Controller datasheet (Rev. C) | PDF | HTML | 04 Jan 2016 |
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| Technical article | When should you use PWM controllers? | PDF | HTML | 02 Dec 2016 | |
| Technical article | Before digital control, there were general-purpose PWMs | PDF | HTML | 19 Oct 2016 | |
| Application note | DN-45 UC3846, UC3856 and UCC3806 Push Pull PWM Current Mode Control ICs | 05 Sep 1999 | ||
| Application note | Modeling, Analysis and Compensation of the Current-Mode Converter | 05 Sep 1999 | ||
| Application note | U-93 A New Integrated Circuit for Current Mode Control | 05 Sep 1999 |
For additional terms or required resources, click any title below to view the detail page where available.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| PDIP (N) | 16 | Ultra Librarian |
| SOIC (DW) | 16 | Ultra Librarian |
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