Datasheet

0 240
R
PS
- PS Resistor - kW
0
100
150
400
120
300
D
PS
- PS Dead Time - ns
PS DEAD TIME
vs
PS RESISTOR
250
200
50
10080604020 140 160 180 200 220
350
UCC28250
SLUSA29C –APRIL 2010– REVISED JULY 2011 www.ti.com
PS (Primary Output Turn-Off to Synchronous Rectifier Turn-On Dead Time Programming) (11/18)
The dead time T
D(ps)
between primary output turn-off to synchronous rectifier turn-on is set by external resistor,
R
PS
, connected between PS pin and ground. The value of is R
PS
is defined by Figure 10. Zero dead time can be
achieved by tying the SP pin to VREF.
NOTE
The minimum value for R
PS
/R
SP
is 5 kΩ and the maximum value is 250 kΩ.
Figure 10. Dead Time T
D(ps)
vs. External Resistor R
PS
at PS Pin
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