TL1454CPW Datasheet, PDF (13/25 Pages) Texas Instruments – DUAL-CHANNEL PULSE-WIDTH-MODULATION (PWM) CONTROL CIRCUIT

TL1454, TL1454Y
DUAL-CHANNEL PULSE-WIDTH-MODULATION (PWM)
CONTROL CIRCUIT
SLVS086B – APRIL 1995 – REVISED NOVEMBER 1997
TYPICAL CHARACTERISTICS
10 M
OSCILLATOR FREQUENCY
vs
TIMING RESISTANCE
VCC = 6 V
TA = 25°C
CT = 10 pF
1M
CT = 120 pF
OSCILLATOR PERIOD
vs
TIMING CAPACITANCE
10 ²
VCC = 6 V
RT = 5.1 kΩ
TA = 25°C
10 ¹
100 k ^{CT = 300 pF}
CT = 1000 pF
10 ⁰
10 k
CT = 3900 pF
1k
1k
10 k
RT – Timing Resistance – Ω
Figure 6
OSCILLATOR FREQUENCY
vs
FREE-AIR TEMPERATURE
530
VCC = 6 V
RT = 10 kΩ
CT = 120 pF
520
100 k
510
500
490
480
– 50
0
50
100
TA – Free-Air Temperature – °C
Figure 8
10 ^{– 1}
10 ⁰
10 ¹
10 ²
10 ³
10 ⁴ 10 ⁵
CT – Timing Capacitance – pF
Figure 7
PWM TRIANGLE WAVEFORM AMPLITUDE
vs
TIMING CAPACITANCE
2
1.9
VO(max)
1.8
1.7
1.6
1.5
1.4
1.3
1.2
VO(min)
1.1
1
0.9
0.8
0.7
VCC = 6 V
RT = 5.1 kΩ
0.6 _{TA = 25°C}
0.5
10 ⁰
10 ¹
10 ²
10 ³
10 ⁴
Timing Capacitance – pF
Figure 9
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