TL1451A_15 Datasheet, PDF (10/36 Pages) Texas Instruments – DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

TL1451A
ą
DUAL PULSEĆWIDTHĆMODULATION CONTROL CIRCUITS
ą
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
TYPICAL CHARACTERISTICS
TRIANGLE OSCILLATOR FREQUENCY
vs
TIMING RESISTANCE
1M
VCC = 5 V
TA = 25°C
100 k
CT = 150 pF
CT = 1500 pF
10 k
CT = 15000 pF
OSCILLATOR FREQUENCY VARIATION
vs
FREE-AIR TEMPERATURE
3
VCC = 3.6 V
RT = 10 kΩ
2 CT = 330 pF
fosc = 200 kHz
1
0
–1
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
–2
1k
1k
4 k 10 k
40 k 100 k 400 k 1 M
RT – Timing Resistance – Ω
Figure 3
–3
–25
0
25
50
75
100
TA – Free-Air Temperature – °C
Figure 4
TRIANGLE WAVEFORM SWING VOLTAGE
vs
TIMING CAPACITANCE
2.6
VCC = 5 V
2.4
RT = 5.1 kΩ
TA = 25°C
2.2
2
1.8
1.6
1.4
1.2
1
0.8
101
102
103
104
105
CT – Timing Capacitance – pF
Figure 5
TRIANGLE WAVEFORM PERIOD
vs
TIMING CAPACITANCE
102
VCC = 5 V
RT = 5.1 kΩ
TA = 25°C
101
100
10^–1
101
102
103
104
105
CT – Timing Capacitance – pF
Figure 6
10
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