Rainbow-electronics MAX8596Z Instrukcja Użytkownika Pobierz pdf (Strona 4)

MAX8595Z/MAX8596Z

High-Efficiency, 32V Step-Up Converters

with T

Derating Option for 2 to 8 White LEDs

4 _______________________________________________________________________________________

Typical Operating Characteristics

(Circuit of Figure 1, V

= 3.6V, I

LED

= 25mA, L = 22µH, C

= 2.2µF, C

OUT

= 0.1µF, C

COMP

= 0.1µF, R

SENSE

= 13Ω, 4 LEDs,

= +25°C, unless otherwise noted.)

EFFICIENCY

vs. INPUT VOLTAGE

MAX8595Z toc01

INPUT VOLTAGE (V)

EFFICIENCY (%)

543

100

3 LEDs

4 LEDs

6 LEDs

8 LEDs

EFFICIENCY

vs. LED CURRENT

MAX8595Z toc02

LED CURRENT (mA)

EFFICIENCY (%)

252015105

030

3 LEDs

6 LEDs

8 LEDs

LED CURRENT

vs. DIRECT-PWM DIMMING

MAX8595Z toc03

DUTY CYCLE (%)

LED CURRENT (mA)

80604020

0 100

LED CURRENT

vs. AMBIENT TEMPERATURE

MAX8595Z toc04

TEMPERATURE (°C)

LED CURRENT (mA)

806020 400-20

-40 100

MAX8596,

LED

= 25mA AT T

= +25°C

MAX8595,

LED

= 15mA

SWITCHING WAVEFORMS

MAX8595Z toc05

500ns/div

20mV/div

AC-COUPLED

200mV/div

AC-COUPLED

100mA/div

10V/div

OUT

SOFT-START AND SHUTDOWN RESPONSE

MAX8595Z toc06

20ms/div

CTRL

2V/div

40mA/div

10V/div

100mA/div

LED

OUT

1 2 3 4 5 6 7 8

MAX8595Z/MAX8596Z 1

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