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UCC28251 Datasheet(PDF) 19 Page - Texas Instruments

Part No. UCC28251
Description  UCC28251 Advanced PWM Controller With Prebias Operation
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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UCC28251 Datasheet(HTML) 19 Page - Texas Instruments

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0
240
RSP - 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
UCC28251
www.ti.com
SLUSBD8E – FEBRUARY 2013 – REVISED DECEMBER 2014
Feature Description (continued)
8.3.5 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 27. 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 rising edge of the primary output OUTA/OUTB.
NOTE
The minimum value for RPS and RSP is 5 kΩ and the maximum value is 250 kΩ.
Figure 27. Dead Time TD(sp) vs. External Resistor RSP at SP Pin
8.3.6 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 28. Zero dead time can be
achieved by tying the SP pin to VREF.
NOTE
The minimum value for RPS and RSP is 5 kΩ and the maximum value is 250 kΩ.
Copyright © 2013–2014, Texas Instruments Incorporated
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