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UCC256301 Datasheet(PDF) 4 Page - Texas Instruments |
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UCC256301 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 70 page 4 6 5 3 1 10 11 14 15 16 HV LO GND LL/SS HO VCC VCR FB BLK 7 UCC256301 LLC Controller HB HS 12 RVCC 9 BW ISNS 8 4 UCC256301 SLUSCU6B – AUGUST 2017 – REVISED AUGUST 2017 www.ti.com Product Folder Links: UCC256301 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated 5 Pin Configuration and Functions DDB Package 16-Pin SOIC Top View Pin Functions PIN I/O DESCRIPTION NAME NO. BLK 4 I This pin is used to sense the PFC output voltage level. A resistive divider should be used to attenuate the signal before it is applied to this pin. The voltage level on this pin will determine when the LLC converter start/stops switching. The sensed BLK voltage is also used to adjust the burst mode threshold to improve efficiency over the input voltage range. BW 8 I This pin is used to sense the output voltage through the bias winding. The sensed voltage is used for output over voltage protection. FB 5 I LLC stage control feedback input. The amount of current sourced from this pin will determine the LLC input power level. GND 11 G Ground reference for all signals. HB 14 I High-side gate-drive floating supply voltage. The bootstrap capacitor is connected between this pin and pin HS. A high voltage, high speed diode should be connected from RVCC to this pin to supply power to the upper MOSFET driver during the period when the lower MOSFET is conducting. HO 15 O High-side floating gate-drive output. HS 16 I High-side gate-drive floating ground. Current return for the high-side gate-drive current. HV 1 I Connects to Internal HV startup JFET. This pin provides start up power for both PFC and LLC stage. This pin also monitors the AC line voltage for x-capacitor discharge function. ISNS 6 I Resonant current sense. The resonant capacitor voltage is differentiated with a first order filter to measure the resonant current LL/SS 9 I The capacitance value connected from this pin to ground will define the duration of the soft- start period. This pin is also used to program the burst mode threshold; the resistor divider on this pin programs the burst mode threshold and the threshold scaling factor with BLK pin voltage. LO 10 O Low-side gate-drive output. Missing 2 N/A Functional creepage and clearance Missing 13 N/A Functional creepage and clearance RVCC 12 P Regulated 12-V supply. This pin is used to supply the gate driver and PFC controller. VCC 3 P Supply input. VCR 7 I Resonant capacitor voltage sense |
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