Datasheet

UC28023
UC28025
SLUS557F -- MARCH 2003 -- REVISED AUGUST 2010
11
www.ti.com
APPLICATION INFORMATION
OSCILLATOR
Figure 7. Oscillator Circuit
UDG--03052
6
4
CT
UC2802x
CLOCK
3V
5
RT
Blanking
5.1 V
I
R
I
C=
I
R
T
D
400 μA
Figure 8.
0.47
0.22
0.047
1.0 2.2 4.7 10.0 22.0 47
0.10
2.20
0.47
1.00
4.70
10.0
100
C
T
-- Timing Capacitance -- nF
T
D
-- D e a d T i m e -- μs
DEAD TIME
vs
TIMING CAPACITANCE
3kΩ≤R
T
≤ 100 kΩ
Figure 9. Oscillator Circuit
10 k
1k
100 k
1 k 10 k 100 k 1 M100
10 nF
22 nF
47 nF
100 nF
f
OSC
-- Frequency -- Hz
R
T
-- Timing Resistance -- Ω
470 pF
1nF
2.2 nF
4.7 nF
TIMING RESISTANCE
vs
FREQUENCY
Figure 10.
T
D
-- D e a d T i m e -- n s
DEAD TIME
vs
FREQUENCY
160
140
120
100
80
10 k 100 k 1 M
C
T
=1nF
f
OSC
-- Frequency -- Hz
C
T
= 470 pF