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UCC28250PWR Datasheet(PDF) 15 Page - Texas Instruments |
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UCC28250PWR Datasheet(HTML) 15 Page - Texas Instruments |
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15 / 48 page  0 240 R SP - SP Resistor - kW 0 100 150 400 120 300 SP DEAD TIME vs SP RESISTOR 250 200 50 100 80 60 40 20 140 160 180 200 220 350 0 240 R PS - PS Resistor - kW 0 100 150 400 120 300 PS DEAD TIME vs PS RESISTOR 250 200 50 100 80 60 40 20 140 160 180 200 220 350 UCC28250 www.ti.com SLUSA29A – APRIL 2010 – REVISED JUNE 2010 SP (Synchronous Rectifier Turn-Off to Primary Output Turn-On Dead Time Programming) (13/19) The dead time TD(sp) between synchronous rectifier turn-off to primary output turn-on is programmed by an external resistor, RSP, connected between the SP pin and ground. The value of RSP can be determined by Figure 9. Zero dead time can be achieved by tying the SP pin to VREF. The falling edge of synchronous rectifier SRA/SRB is aligned with the raising edge of the primary output OUTA/OUTB. Figure 9. Dead Time TD(sp) vs. External Resistor RSP at SP Pin PS (Primary Output Turn-Off to Synchronous Rectifier Turn-On Dead Time Programming) (11/18) The dead time TD(ps) between primary output turn-off to synchronous rectifier turn-on is set by external resistor, RPS, connected between PS pin and ground. The value of is RPS is defined by Figure 10. Zero dead time can be achieved by tying the SP pin to VREF. Figure 10. Dead Time TD(ps) vs. External Resistor RPS at PS Pin Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 15 Product Folder Link(s): UCC28250 |
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