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UCC28730 Datasheet(PDF) 3 Page - Texas Instruments |
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UCC28730 Datasheet(HTML) 3 Page - Texas Instruments |
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3 / 42 page  VDD VS GND HV DRV CS 7 6 5 4 3 2 1 CBC 3 UCC28730-Q1 www.ti.com SLUSCR9 – JUNE 2017 Product Folder Links: UCC28730-Q1 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated (1) P = Power, G = Ground, I = Input, O = Output, I/O = Input/Output 5 Pin Configuration and Functions D Package 7-Pin SOIC Top View Pin Functions(1) PIN I/O DESCRIPTION NAME NO. VDD 1 P VDD is the bias supply input pin to the controller. A carefully-placed by-pass capacitor to GND is required on this pin. VS 2 I Voltage Sense is an input used to provide voltage feed-back and demagnetization timing to the controller for output voltage regulation, frequency limiting, constant-current control, line voltage detection, and output over-voltage detection. This pin is connected to a voltage divider between an auxiliary winding and 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. This input also detects a qualified wake-up signal when operating in the Wait state. CBC 3 I CaBle Compensation is a programming pin for compensation of cable voltage drop. Cable compensation is programmed with a resistor to GND. GND 4 G The GrouND 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 as close as possible to this pin and avoid any common trace length with power and signal return paths. CS 5 I Current Sense 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 peak primary current. A series resistor can be added to this pin to compensate the peak switch current levels as the rectified bulk voltage varies. DRV 6 O DRiVe is an output used to drive the gate of an external high-voltage MOSFET switching transistor. HV 7 I The High Voltage pin connects directly to the rectified bulk voltage and provides charge to the VDD capacitor for start-up of the power supply. |
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