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UCC2800N Datasheet(PDF) 11 Page - Texas Instruments |
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UCC2800N Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 55 page  0.65R R GND 5 Voltage Reference VCC OK REF OK Logic Power REF 8 4V 0.5V FB 2 COMP 1 Full Cycle Soft Start j=4ms Leading Edge Blanking CS 3 OUT 6 RC 4 PWM Latch S Q R Oscillator VCC 7 REF/2 1.5V T Q UCCx801 UCCx804 UCCx805 only 13.5V 1V S Q R S Q R Copyright © 2016, Texas Instruments Incorporated Over-Current 11 UCC1800, UCC1801, UCC1802, UCC1803, UCC1804, UCC1805 UCC2800, UCC2801, UCC2802, UCC2803, UCC2804, UCC2805 UCC3800, UCC3801, UCC3802, UCC3803, UCC3804, UCC3805 www.ti.com SLUS270E – MARCH 1999 – REVISED JUNE 2016 Product Folder Links: UCC1800 UCC1801 UCC1802 UCC1803 UCC1804 UCC1805 UCC2800 UCC2801 UCC2802 UCC2803 UCC2804 UCC2805 UCC3800 UCC3801 UCC3802 UCC3803 UCC3804 UCC3805 Submit Documentation Feedback Copyright © 1999–2016, Texas Instruments Incorporated 9 Detailed Description 9.1 Overview The UCCx80x family of high-speed, low-power integrated circuits contain all of the control and drive components required for off-line and DC-to-DC fixed-frequency, current-mode switching mode power supplies with minimal parts count. These devices have the same pin configuration as the UCx84x family, and also offer the added features of internal full-cycle soft start and internal leading-edge blanking of the current-sense input. 9.2 Functional Block Diagram 9.3 Feature Description The UCCx80x family offers numerous advantages that allow the power supply design engineer to meet these challenging requirements. Features include: • Bi-CMOS process • Low starting supply current: typically 100 μA • Low operating supply current: typically 500 μA • Pinout compatible with UC3842 and UC3842A families • 5-V operation (UCCx803 and UCCx805) • Leading edge blanking of current sense signal • On-chip soft start • Internal full cycle restart delay • 1.5% voltage reference • Up to 1-MHz oscillator • Low self-biasing output during UVLO • Very few external components required • 70-ns response from current sense to output • Available in surface-mount or PDIP package |
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