UCC2813-0/-1/-2/-3/-4/-5
UCC3813-0/-1/-2/-3/-4/-5
APPLICATION INFORMATION (cont.)
4.00
3.98
3.96
3.94
V
REF
(V)
3.92
3.90
3.88
3.86
3.84
3.82
4
4.2
4.4
4.6
4.8
5.2
V
CC
(V)
5
5.4
5.6
5.8
6
Figure 2. Error amplifier gain/phase response.
1000
Figure 5. UCC3813-3/-5 V
REF
vs. V
CC
; I
LOAD
= 0.5mA.
1000
Oscillator Freq. (kHz)
100
10
0p
F
20
0p
33 F
0p
F
1n
F
Oscillator Freq. (kHz)
100
10
20
33
0p
F
0p
F
0p
F
1n
10
10
100
R
T
(k )
1000
10
10
F
100
R
T
(k )
1000
Figure 3. UCC3813-0/-1/-2/-4 oscillator frequency vs.
R
T
and C
T.
100
99.5
Figure 6. UCC3813-3/-5 oscillator frequency vs. R
T
and C
T.
50
49.5
Maximum Duty Cycle (%)
99
98.5
C
T
C
T
=1
Maximum Duty Cycle (%)
49
C
T
C
T
=1
98
C
T
48.5
48
47.5
47
=2
=2
00
pF
00
C
T
pF
97.5
97
96.5
96
95.5
95
10
00
pF
00
=3
30
=3
30
pF
pF
pF
46.5
100
Oscillator Frequency (kHz)
1000
10
100
Oscillator Frequency (kHz)
1000
Figure 4. UCC3813-0/-2/-3 max. duty cycle vs.
oscillator frequency.
6
Figure 7. UCC3813-1/-4/-5 max. duty cycle vs.
oscillator frequency.
TI [ TEXAS INSTRUMENTS ]
