ꢀ ꢁꢂꢃ ꢄꢂ ꢅ
ꢀ ꢁꢂꢃ ꢄꢂ ꢆ
SLUS557B − MARCH 2003 − REVISED APRIL 2004
APPLICATION INFORMATION
OSCILLATOR
DEAD TIME
vs
TIMING CAPACITANCE
10.0
UC2802x
3 kΩ ≤ R ≤ 100 kΩ
RT
CT
T
I
R
5
6
4.70
3 V
I
I
C = R
2.20
1.00
0.47
0.22
5.1 V
CLOCK
4
Blanking
0.10
T
D
400 µA
0.047
0.047
1.0
2.2
4.7
10.0
22.0
47
100
UDG−03052
C
− Timing Capacitance − nF
T
Figure 8.
Figure 7. Oscillator Circuit
DEAD TIME
vs
TIMING RESISTANCE
vs
FREQUENCY
FREQUENCY
160
140
120
100
80
100 k
4.7 nF
2.2 nF
1 nF
R
= 1 nF
T
470 pF
10 k
100 nF
47 nF
R
= 470 pF
T
22 nF
10 nF
1 k
100
10 k
100 k
− Frequency − Hz
1 M
1 k
f
10 k
100 k
1 M
f
− Frequency − Hz
OSC
OSC
Figure 10.
Figure 9. Oscillator Circuit
10
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