The UC1825 family of PWM control ICs is optimized for high frequency switched mode power supply applications. Particular care was given to minimizing propagation delays through the comparators and logic circuitry while maximizing bandwidth and slew rate of the error amplifier. This controller is designed for use in either current-mode or voltage mode systems with the capability for input voltage feed-forward.
Protection circuitry includes a current limit comparator with a 1V threshold, a TTL compatible shutdown port, and a soft start pin which will double as a maximum duty cycle clamp. The logic is fully latched to provide jitter free operation and prohibit multiple pulses at an output. An under-voltage lockout section with 800mV of hysteresis assures low start up current. During under-voltage lockout, the outputs are high impedance.
These devices feature totem pole outputs designed to source and sink high peak currents from capacitive loads, such as the gate of a power MOSFET. The on state is designed as a high level.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | High Speed PWM Controller datasheet (Rev. A) | 24 Feb 2004 | |
| * | SMD | UC1825 SMD 5962-87681 | 21 Jun 2016 | |
| Technical article | Power Tips: Calculate an R-C snubber in seven steps | PDF | HTML | 05 May 2016 | |
| Application note | U-110 1.5 Mhz Current Mode IC Controlled 50-Watt Power Supply | 05 Sep 1999 | ||
| Application note | U-111, Practical Considerations in Current Mode Power Supplies | 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 |
|---|---|---|
| CDIP (J) | 16 | Ultra Librarian |
| CFP (W) | 16 | Ultra Librarian |
| LCCC (FK) | 20 | Ultra Librarian |
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