Rainbow-electronics MAX1579 Manual do Utilizador descarregar pdf (Página 5)

Typical Operating Characteristics (continued)

(Circuit of Figure 3, V

= 3.6V, I

LED

= 20mA, 4 LEDs, CTRL = IN, T

= +25°C, unless otherwise noted.)

MAX1578/MAX1579

Complete Bias and White LED Power Supplies

for Small TFT Displays

_______________________________________________________________________________________ 5

PWM-DIMMING WAVEFORMS

MAX1578toc08

CTRL

OUT

AC-COUPLED

2V/div

50mV/div

20mA/div

20mV/div

s/div

400

200

800

600

1200

1000

1400

023145

LCD BIAS SUPPLY CURRENT

vs. INPUT VOLTAGE

MAX1578toc09

INPUT VOLTAGE (V)

(µA)

CTRL

= 0V

LCD BIAS STARTUP SEQUENCE

MAX1578toc10

ONBIAS

POS

NEG

MAIN

5V/div

10V/div

5V/div

10ms/div

BOOST STARTUP AND

SHUTDOWN WAVEFORMS

MAX1578toc07

CTRL

OUT

AC-COUPLED

2V/div

5V/div

100mA/div

20mV/div

4ms/div

0405020 3010 60 70 80 90 100

LED CURRENT vs.

DIRECT-PWM DUTY CYCLE

MAX1578toc05

PWM DUTY CYCLE (%)

LED

(mA)

PWM

= 200Hz TO 200kHz

BOOST-SWITCHING WAVEFORMS

MAX1578toc06

AC-COUPLED

OUT

AC-COUPLED

20mV/div

10V/div

200mV/div

400ns/div

1 2 3 4 5 6 7 8 9 10 11 12 13

MAX1578/MAX1579 1

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