CMOS CURRENT MODE
PWM CONTROLLERS
TC18C46
TC28C46
TC38C46
TYPICAL CHARACTERISTICS
18C46 Dead Time vs. C
t
11000
10000
Dead Time (nsec)
8000
7000
6000
5000
4000
3000
2000
1000
0
1000
2000
3000
4000
5000
Ct, pF
2k
100k
10k
Dead Time (nsec)
9000
11000
10000
9000
8000
7000
6000
5000
4000
3000
2000
1000
0
1000pF
500pF
100pF
20
40
60
Rt, kΩ
80
100
2200pF
4700pF
1
18C46 Dead Time vs. R
t
2
3
4
5
18C46 OSC Frequency vs. C
t
400
350
2k
300
FOSC, KHz
FOSC, KHz
250
200
150
100
50
0
1000
2000
3000
4000
5000
Ct, pF
10k
100k
300
250
200
400
350
18C46 OSC Frequency vs. R
t
100pF
500pF
150
100
50
0
20
40
60
Rt, kΩ
80
100
1000pF
2200pF
4700pF
6
7
8
TELCOM SEMICONDUCTOR, INC.
4-109