Rainbow-electronics MAX8848Z Manual de usuario descargar pdf (Pagina 5)

High-Performance Negative Charge Pump

for 7 White LEDs in 3mm x 3mm Thin QFN

MAX8848Y/MAX8848Z

_______________________________________________________________________________________ 5

Typical Operating Characteristics (continued)

= 3.6V, V

EN_

= V

, circuit of Figure 1, T

= +25°C, unless otherwise noted.)

1.5x MODE OPERATING WAVEFORM

= 3V)

MAX8848Y toc13

100mA/div

20mA/div

100mV/div

AC-COUPLED

ILED1

ALL LEDS ON

24mA/LED

1µs/div

1x MODE OPERATING WAVEFORM

= 4V)

MAX8848Y toc12

100mA/div

20mA/div

100mV/div

AC-COUPLED

ILED1

ALL LEDS ON

24mA/LED

1µs/div

SINGLE-WIRE SERIAL-PULSE DIMMING

RESPONSE (MAX8848Y)

MAX8848Y toc15

20mA/div

50mA/div

5V/div

1x MODE

ALL LEDS OPERATING

ENA

= V

ENB

TOTAL

LED

LED1

10ms/div

STARTUP AND SHUTDOWN RESPONSE

(MAX8848Y)

MAX8848Y toc14

200mV/div

AC-COUPLED

200mA/div

20mA/div

2V/div

ENA/ENB

ILED1

ENA = ENB

24mA/LED

2ms/div

LED CURRENT vs. TEMPERATURE

MAX8848Y toc11

TEMPERATURE (°C)

LED CURRENT (mA)

603510-15

-40 85

24mA/LED

LED CURRENT MATCHING

vs. SUPPLY VOLTAGE

MAX8848Y toc10

SUPPLY VOLTAGE (V)

LED CURRENT (mA)

5.14.73.9 4.33.53.1

15.2

15.4

15.6

15.8

16.0

16.2

16.4

16.6

16.8

17.0

MAX8848Y

16mA/LED, V

FALLING

15.0

2.7 5.5

1 2 3 4 5 6 7 8 9 10 ... 13 14

MAX8848Y/MAX8848Z 1

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Rainbow-electronics MAX8848Z Manual de usuario Pagina 5

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