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UCC1806 Datasheet(PDF) 6 Page - Texas Instruments

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Part No. UCC1806
Description  Low Power, Dual Output, Current Mode PWM Controller
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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UCC1806 Datasheet(HTML) 6 Page - Texas Instruments

   
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6
UCC1806
UCC2806
UCC3806
47pF
100pF
220pF
330pF
470pf
1.0nF
2.2nF
10k
100k
1M
10k
1
100k
1M
CT=
Figure 3. Oscillator frequency vs. RT and CT.
TYPICAL CHARACTERISTICS (continued)
Design Equations
for Oscillator:
F
TT
OSC
RAMP
FALL
=
+
1
TRT CT
RAMP =•
19 2
.
T
CT
RT
FALL =
24
0 002
125
.
.
.
Dead Time TFALL
=
0
5
10
15
20
25
0
500k
1M
1.5M
Oscillator Frequency (Hz)
I@ Load or No Load
IN
I
@
Output
Load
= 1nF
, 10
Ser
ies
Resistance
C
I@ No Load
C
Figure 4. Supply current vs. oscillator frequency.
25
30
35
40
45
50
1k
10k
100k
1M
Oscillator Frequency (Hz)
Figure 5. Maximum duty cycle vs. frequency.


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