TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
TYPICAL CHARACTERISTICS
TRIANGLE OSCILLATOR FREQUENCY
OSCILLATOR FREQUENCY VARIATION
vs
vs
TIMING RESISTANCE
FREE-AIR TEMPERATURE
3
2
1 M
100 k
10 k
1 k
V
R
C
= 3.6 V
= 10 kΩ
= 330 pF
= 200 kHz
V
T
A
= 5 V
= 25°C
CC
T
T
CC
f
osc
C
= 150 pF
T
1
0
C
= 1500 pF
T
–1
–2
–3
C
= 15000 pF
T
–25
0
25
50
75
100
1 k
4 k 10 k
40 k 100 k
400 k 1 M
T
A
– Free-Air Temperature – °C
R
– Timing Resistance – Ω
T
Figure 3
Figure 4
TRIANGLE WAVEFORM PERIOD
TRIANGLE WAVEFORM SWING VOLTAGE
vs
vs
TIMING CAPACITANCE
TIMING CAPACITANCE
2
10
1
10
0
10
2.6
2.4
V
R
T
A
= 5 V
= 5.1 kΩ
= 25°C
CC
T
V
R
T
A
= 5 V
= 5.1 kΩ
= 25°C
CC
T
2.2
2
1.8
1.6
1.4
1.2
1
–1
10
0.8
10
1
2
10
3
10
4
10
5
10
1
2
10
3
10
4
10
5
10
10
C
– Timing Capacitance – pF
C
– Timing Capacitance – pF
T
T
Figure 5
Figure 6
10
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
