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| UCC28251 Datasheet, PDF (16/54 Pages) Texas Instruments – Advanced PWM Controller With Pre-Bias Operation | |||
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UCC28251
SLUSBD8D â FEBRUARY 2013 â REVISED APRIL 2013
www.ti.com
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 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.
SP DEAD TIME
vs
SP RESISTOR
400
350
300
250
200
150
100
50
0
0 20 40 60 80 100 120 140 160 180 200 220 240
RSP - SP Resistor - kW
Figure 9. Dead Time TD(sp) vs. External Resistor RSP at SP Pin
16
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