TL1454CPWLE datasheet(13/24 Pages) TI

13 / 24 page

TL1454, TL1454Y

DUAL-CHANNEL PULSE-WIDTH-MODULATION (PWM)

CONTROL CIRCUIT

SLVS086B – APRIL 1995 – REVISED NOVEMBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

TYPICAL CHARACTERISTICS

Figure 6

100 k

10 k

1 k

OSCILLATOR FREQUENCY

TIMING RESISTANCE

RT – Timing Resistance – Ω

1 k

10 k

100 k

10 M

1 M

CT = 10 pF

CT = 120 pF

CT = 3900 pF

VCC = 6 V

TA = 25°C

CT = 1000 pF

CT = 300 pF

Figure 7

OSCILLATOR PERIOD

TIMING CAPACITANCE

10 –1

10 0

10 5

CT – Timing Capacitance – pF

10 1

10 0

10 1

VCC = 6 V

RT = 5.1 kΩ

TA = 25°C

10 2

10 3

10 4

Figure 8

510

500

490

480

520

OSCILLATOR FREQUENCY

FREE-AIR TEMPERATURE

530

– 50

100

TA – Free-Air Temperature – °C

VCC = 6 V

RT = 10 kΩ

CT = 120 pF

Figure 9

1.5

0.5

PWM TRIANGLE WAVEFORM AMPLITUDE

TIMING CAPACITANCE

10 0

10 1

10 2

10 3

Timing Capacitance – pF

10 4

VCC = 6 V

RT = 5.1 kΩ

TA = 25°C

VO(min)

VO(max)

1.9

1.8

1.7

1.6

1.4

1.3

1.2

1.1

0.9

0.8

0.7

0.6

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