Rainbow-electronics MAX17127 Manual do Utilizador descarregar pdf (Página 7)

_______________________________________________________________________________________ 7

MAX17127

Six-String WLED Driver with Integrated

Step-Up Converter

Typical Operating Characteristics (continued)

(Circuit of Figure 1. V

= 12V, T

= +25NC, unless otherwise noted.)

SWITCHING WAVEFORMS

= 26V, BRIGHTNESS = 100%)

MAX17127 toc09

1µs/div

20V/div

0mA

200mA/div

INDUCTOR

CURRENT

OUT

= 32V, I

OUT

= 120mA

STARTUP WAVEFORMS

(BRIGHTNESS = 100%)

MAX17127 toc10

1ms/div

20V/div

OUT

20V/div

5V/div

INDUCTOR

CURRENT

500mA/div

12V

STARTUP WAVEFORMS

(BRIGHTNESS = 20%)

MAX17127 toc11

2ms/div

20V/div

OUT

20V/div

5V/div

INDUCTOR

CURRENT

500mA/div

12V

LED CURRENT WAVEFORMS

(BRIGHTNESS = 50%)

MAX17127 toc12

1ms/div

FB1

10V/div

INDUCTOR

CURRENT

500mA/div

0mA

LED

20mA/div

0mA

LED CURRENT WAVEFORMS

(BRIGHTNESS = 1%)

MAX17127 toc13

1ms/div

FB1

10V/div

INDUCTOR

CURRENT

500mA/div

0mA

FB1

20mA/div

0mA

LED-OPEN FAULT PROTECTION

(BRIGHTNESS = 100%, LED OPEN ON FB1)

MAX17127 toc14

200ms/div

OUT

10V/div

FB1

1V/div

FB2

10V/div

FB2

10mA/div

10V

20mA

0mA

32V

1 2 3 4 5 6 7 8 9 10 11 12 ... 21 22

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