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UCC2801-Q1 Datasheet(PDF) 4 Page - Texas Instruments |
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UCC2801-Q1 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 55 page 1 COMP 8 REF 2 FB 7 VCC 3 CS 6 OUT 4 RC 5 GND 1 COMP 8 REF 2 FB 7 VCC 3 CS 6 OUT 4 RC 5 GND 4 UCC1800, UCC1801, UCC1802, UCC1803, UCC1804, UCC1805 UCC2800, UCC2801, UCC2802, UCC2803, UCC2804, UCC2805 UCC3800, UCC3801, UCC3802, UCC3803, UCC3804, UCC3805 SLUS270E – MARCH 1999 – REVISED JUNE 2016 www.ti.com 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 7 Pin Configuration and Functions UCC280x and UCC380x PW Package 8-Pin TSSOP Top View UCCx80x D, J, or N Package 8-Pin SOIC, CDIP, or PDIP Top View UCC1800 L Package 20-Pin LCC Top View Pin Functions PIN I/O DESCRIPTION NAME TSSOP, SOIC, DIL LCC COMP 1 2 O COMP is the output of the error amplifier and the input of the PWM comparator. The error amplifier in the UCCx80x family is a true, low output impedance, 2-MHz operational amplifier. As such, the COMP terminal can both source and sink current. However, the error amplifier is internally current-limited, so the user can command zero duty cycle by externally forcing COMP to GND. The UCCx80x family features built-in full-cycle soft start. Soft start is implemented as a clamp on the maximum COMP voltage. CS 3 7 I CS is the input to the current sense comparators. The UCCx80x family has two different current sense comparators: the PWM comparator and an overcurrent comparator. The UCCx80x family contains digital current sense filtering, which disconnects the CS terminal from the current sense comparator during the 100-ns interval immediately following the rising edge of the OUT pin. This digital filtering, also called leading-edge blanking, means that in most applications, no analog filtering (RC filter) is required on CS. Compared to an external RC filter technique, the leading-edge blanking provides a smaller effective CS to OUT propagation delay. Note, however, that the minimum non-zero On-time of the OUT signal is directly affected by the leading-edge-blanking and the CS to OUT propagation delay. The overcurrent comparator is only intended for fault sensing, and exceeding the overcurrent threshold causes a soft-start cycle. FB 2 5 I FB is the inverting input of the error amplifier. For best stability, keep FB lead length as short as possible and FB stray capacitance as small as possible. GND 5 13 — GND is reference ground and power ground for all functions on this part. NC — 1, 3, 4, 6, 8, 9, 11, 14, 16, 18, 19 — No connection pins |
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