The UC3856 is a high performance version of the popular UC3846 series of current mode controllers, and is intended for both design upgrades and new applications where speed and accuracy are important. All input to output delays have been minimized, and the current sense output is slew rate limited to reduce noise sensitivity. Fast 1.5A peak output stages have been added to allow rapid switching of power FETs.
A low impedance TTL compatible sync output has been implemented with a tri-state function when used as a sync input.
Internal chip grounding has been improved to minimize internal \x93noise\x94 caused when driving large capacitive loads. This, in conjunction with the improved differential current sense amplifier results in enhanced noise immunity.
Other features include a trimmed oscillator current (8%) for accurate frequency and dead time control; a 1V, 5% shutdown threshold; and 4kV minimum ESD protection on all pins.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | Improved Current Mode PWM Controller datasheet (Rev. A) | 07 Oct 2010 | |
| * | SMD | UC1856 SMD 5962-94530 | 21 Jun 2016 | |
| Application note | DN-45 UC3846, UC3856 and UCC3806 Push Pull PWM Current Mode Control ICs | 05 Sep 1999 | ||
| Application note | DN-62 Switching Power Supply Topology Voltage Mode vs. Current Mode | 05 Sep 1999 |
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| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| CDIP (J) | 16 | Ultra Librarian |
| LCCC (FK) | 20 | Ultra Librarian |
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