TL494
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS074E – JANUARY 1983 – REVISED FEBRUARY 2005
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TYPICAL CHARACTERISTICS
OSCILLATOR FREQUENCY AND
FREQUENCY VARIATION
†
vs
TIMING RESISTANCE
100 k
40 k
−2%
10 k
4k
1k
400
100
40
10
1k
−1%
0%
0.1
µF
†
Df = 1%
C
T
= 1
µF
0.01
µF
V
CC
= 15 V
T
A
= 25°C
0.001
µF
f − Oscillator Frequency and Frequency Variation − Hz
4k
10 k
40 k
100 k
400 k
1M
R
T
− Timing Resistance −
Ω
†
Frequency variation (∆f) is the change in oscillator frequency that occurs over the full temperature range.
Figure 5.
AMPLIFIER VOLTAGE AMPLIFICATION
vs
FREQUENCY
100
A − Amplifier Voltage Amplification − dB
90
80
70
60
50
40
30
20
10
0
1
10
100
1k
10 k
100 k
1M
V
CC
= 15 V
∆V
O
= 3 V
T
A
= 25°C
f − Frequency − Hz
Figure 6.
8
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