Rainbow-electronics MAX1579 Manual do Utilizador descarregar pdf (Página 4)

MAX1578/MAX1579

Complete Bias and White LED Power Supplies

for Small TFT Displays

4 _______________________________________________________________________________________

Note 1: All devices are 100% production tested at T

= +25°C. Limits over the operating temperature range are guaranteed by design.

Note 2: V

is the forward-voltage drop of diode D1 in Figure 3.

Note 3: Time from CTRL going below the Dual-Mode threshold to IC shutdown.

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 3, V

= 3V, CTRL = ONBIAS = IN, T

= -40°C to +85°C, typical values are at T

= +25°C, unless otherwise noted. Note 1)

PARAMETER CONDITIONS

MIN

TYP

MAX

UNITS

N-CHANNEL SWITCH

LX On-Resistance I

= 190mA

0.82

1.5 Ω

= +25°C

0.01

LX Leakage Current V

= 28V, CTRL = GND

= +85°C 1

µA

LX Current Limit Duty cycle = 90%

500 700 900

Typical Operating Characteristics

(Circuit of Figure 3, V

= 3.6V, I

LED

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

= +25°C, unless otherwise noted.)

0 5 10 15 20 25

LED EFFICIENCY vs. I

LED

MAX1578toc01

LED CURRENT (mA)

EFFICIENCY (%)

2 LEDs

4 LEDs

6 LEDs

8 LEDs

2.5 3.0 3.5 4.0 4.5 5.0 5.5

LED EFFICIENCY vs. V

MAX1578toc02

INPUT VOLTAGE (V)

EFFICIENCY (%)

LED

= 2mA

LED

= 10mA

LED

= 20mA

-40 85

LED CURRENT vs. TEMPERATURE

MAX1578toc03

TEMPERATURE (°C)

LED

(mA)

10-15 35 60

MAX1579

= 13

Ω

MAX1578

= 22

Ω

01.00.5 1.5 2.0 2.5

LED CURRENT vs. V

CTRL

MAX1578toc04

CTRL VOLTAGE (V)

LED

(mA)

1 2 3 4 5 6 7 8 9 ... 12 13

MAX1578/MAX1579 1

Comentários a estes Manuais

Sem comentários

Rainbow-electronics MAX1579 Manual do Utilizador Página 4

Comentários a estes Manuais

Manuais e produtos relacionados com Sensores Rainbow-electronics MAX1579