Datasheet
( ) ( )
TON
s
TON s 15 R M
M
m
æ ö
m = W
ç ÷
W
è ø
TON
0.010 R (M ) 0.301£ W £
TON
TON( s)
R (M )
s
15
M
m
W =
m
æ ö
ç ÷
W
è ø
0.15 TON( s) 4.5£ m £
UCC24610
SLUSA87B –AUGUST 2010–REVISED SEPTEMBER 2010
www.ti.com
TON Programming
The voltage on this pin is internally regulated to 2 V, and an external resistor to GND sets a current which
programs the minimum on time TON. If a noise-filter capacitor is deemed to be necessary on this pin, do not
exceed 100 pF to avoid instability of the 2-V regulator.
Because V
DS
of the SR-MOSFET may ring above -5 mV one or more times immediately after turn on (due to
circuit parasitic elements) TON time should be programmed to block GATE turn off for the duration of this
spurious ringing. In a system, the duration of this ringing may be unknown until actual prototypes are operational
and observable, so a longer TON time may be initially programmed and the final value adjusted after system
evaluation and optimization.
Nominal TON minimum on time is programmed by the following formula, where TON is in µs and R
TON
is in MΩ:
(6)
Valid for:
(7)
Conversely,
(8)
Valid for:
(9)
For resistance values of R
TON
outside of the valid range given above, the device may enter a Fault-Protection
Mode as detailed below.
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