TL1451A-Q1 Datasheet, PDF (8/24 Pages) Texas Instruments – DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

TL1451A-Q1
ą
DUAL PULSEĆWIDTHĆMODULATION CONTROL CIRCUITS
ą
SGLS304A − JUNE 2005 − REVISED JUNE 2008
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
8
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