Rainbow-electronics MAX1698 Manual do Utilizador descarregar pdf (Página 4)

MAX1698

High-Efficiency Step-Up

Current Regulator for LEDs

4 _______________________________________________________________________________________

045231 678910

MXA1698-01

BATT

, V

(V)

OUTPUT CURRENT (mA)

OUTPUT CURRENT vs. V

BATT

AND V

1 CHAIN OF 4 LEDs

vs. V

vs.

BATT

0.4

0.2

0.8

0.6

1.0

1.2

0 0.6 0.80.2 0.4 1.0 1.2 1.4

NORMALIZED OUTPUT CURRENT

vs. ADJ VOLTAGE

MXA1698-02

ADJ VOLTAGE (V)

NORMALIZED OUTPUT CURRENT

20.0

20.5

21.5

21.0

22.0

0 468102 1214161820

MXA1698-03

INPUT VOLTAGE (V)

OUTPUT CURRENT (mA)

OUTPUT CURRENT

vs. INPUT VOLTAGE

1 CHAIN OF 4 LEDs

BATT

OUT

4 CHAINS OF 4 LEDs

200

100

400

300

600

500

700

900

800

1000

0 2341 567 9810

BATTERY CURRENT

vs. BATTERY VOLTAGE

MXA1698-04

BATT

(V)

OUT,

BATT

(mA)

100

100 400 700 1000 1300 1600 1900 2200

EXT RISE/FALL TIME vs. C

EXT

MXA1698-05

EXT

)

RISE/FALL TIME (ns)

FALL TIME

RISE TIME

100

0426810

EFFICIENCY vs. BATTERY VOLTAGE

MXA1698-06

BATTERY VOLTAGE (V)

EFFICIENCY (%)

OUT

= 80mA

4 CHAINS OF 4 LEDs

100

5253515 45 55 65 75 85

MXA1698-07

OUTPUT CURRENT (mA)

EFFICIENCY (%)

EFFICIENCY vs. OUTPUT CURRENT

BATT

= 5V

4 CHAINS OF 4 LEDs

MXA1698-08

OUT

50mA/div

5ms/div

SHUTDOWN/SOFT-START TIMING

SHDN

5V/div

BATT

100mA/div

3.3V

4 CHAINS OF 4 LEDs

OUT

SET TO 80mA,

MXA1698-09

LED AND INDUCTOR CURRENT

WAVEFORMS

INDUCTOR

CURRENT

500mA/div

LED

CURRENT

50mA/div

1µs/div

Typical Operating Characteristics

(Circuit of Figure 2, V

= V

BATT

= 3.3V, V

ADJ

= V

REF

, T

= +25°C, unless otherwise noted.)

1 2 3 4 5 6 7 8

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