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UCC28711 Datasheet(PDF) 7 Page - Texas Instruments |
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UCC28711 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 32 page VDD VS CBC GND HV DRV CS 1 2 3 4 7 6 5 UCC28710 UCC28714 UCC28715 VDD VS NTC GND HV DRV CS 1 2 3 4 7 6 5 UCC28711 UCC28712 UCC28713 UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 www.ti.com SLUSB86 – NOVEMBER 2012 SOIC (D) PACKAGE 7 PINS (TOP VIEW) PIN FUNCTIONS UCC28710 UCC28711 NAME UCC28714 UCC28712 I/O DESCRIPTION UCC28715 UCC28713 Cable compensation is a programming pin for compensation of cable voltage drop. CBC 3 — I Cable compensation is programmed with a resistor to GND. 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 CS 5 5 I 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 is an output used to drive the gate of an external high voltage MOSFET DRV 6 6 O switching transistor. 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 GND 4 4 — as close as possible to this pin and avoid any common trace length with analog signal return paths. The high-voltage pin connects directly to the rectified bulk voltage and provides HV 7 7 I charge to the VDD capacitor for start-up of the power supply. NTC an interface to an external negative temperature coefficient resistor for remote NTC — 3 I temperature sensing. Pulling this pin low shuts down PWM action. VDD is the bias supply input pin to the controller. A carefully-placed bypass capacitor VDD 1 1 I to GND is required on this pin. Voltage sense 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 2 2 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 © 2012, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 |
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