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UCC28700-Q1 Datasheet(PDF) 3 Page - Texas Instruments |
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UCC28700-Q1 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 38 page 1 2 3 6 5 4 VDD DRV VS GND CS CBC UCC28700-Q1 www.ti.com SLUSC61 – JANUARY 2015 5 Pin Configuration and Functions UCC28700-Q1 SOT23-6 (DBV) Top View Pin Functions PIN UCC28700-Q1 I/O DESCRIPTION NAME NO. Cable Compensation (CBC) is a programming pin for compensation of cable voltage CBC 1 I drop. Cable compensation is programmed with a resistor to GND. Current Sense (CS) input connects to a ground-referenced current-sense resistor in series with the power switch. The resulting voltage is used to monitor and control the CS 4 I peak primary current. A series resistor can be added to this pin to compensate the peak switch current levels as the AC-mains input varies. Drive (DRV) is an output used to drive the gate of an external high voltage MOSFET DRV 3 O switching transistor. The Ground (GND) pin is both the reference pin for the controller and the low-side return for the drive output. Special care should be taken to return all AC decoupling capacitors GND 5 — as close as possible to this pin and avoid any common trace length with analog signal return paths. VDD is the bias supply input pin to the controller. A carefully-placed bypass capacitor to VDD 2 — GND is required on this pin. Voltage Sense (VS) is an input used to provide voltage and timing feedback to the controller. This pin is connected to a voltage divider between an auxiliary winding and VS 6 I GND. The value of the upper resistor of this divider is used to program the AC-mains run and stop thresholds and line compensation at the CS pin. Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: UCC28700-Q1 |
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