Datasheet

UCC1806
UCC2806
UCC3806
SLUS272F -- FEBRUARY 2000 -- REVISED AUGUST 2006
11
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10 k
0
100 k 1 M
10 k
100 k
1M
C
T
=47pF
C
T
= 100 pF
f
OSC
-- Oscillator Frequency -- kHz
R
T
-- Timing Resistance -- Ω
C
T
= 220 pF
C
T
=2.2nF
C
T
=1.0nF
C
T
= 470 pF
C
T
= 330 pF
Figure 3.
OSCILLATOR FREQUENCY
vs
TIMING RESISTANCE
REVISION HISTORY
DATE REVISION DESCRIPTION
3/11/05 SLUS272D (Rev. D) Updated Equation 2 and 3 to remove x3 factor.
5/3/05 SLUS272E (Rev. E)
Adjusted the factors of the switching fr equency, Equation 1 and modified the typical
discharge current from 2.0 mA to 2.5 mA.