Rainbow-electronics MAX8759 Manual de usuario descargar pdf (Pagina 6)

MAX8759

Low-Cost, SMBus, CCFL Backlight Controller

6 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V

BATT

= 12V, V

= V

DD,

= -40°C to +85°C.) (Note 1)

PARAMETER CONDITIONS

MIN TYP MAX

UNITS

PWMI Input Low Voltage 0.7 V

PWMI Input High Voltage 2.1 V

PWMI Input Frequency Range 5 50 kHz

PWMI duty cycle = 100% 98

PWMI duty cycle = 50% 48 52PWMI Brightness Setting

PWMI duty cycle = 0% 9.7

10.3

ALS Full-Adjustment Range 0 1.8 V

VALS Output Voltage

MAX8759 is enabled, 6V < V

BATT

< 28V,

LOAD

= 1mA

5.10 5.50

VALS On-Resistance MAX8759 is enabled 60 Ω

BATT

= 9V, R

THR

= 100kΩ 0 0.3

Zero-Crossing Delay

BATT

= 12V, R

THR

= 100kΩ

1.50 2.10

µs

Maximum Zero-Crossing Delay V

BATT

= 16V, R

THR

= 100kΩ 3.2 4.4 µs

DEL rising 4.5

DEL Disable Threshold

DEL falling 3.9

ISEC

< 1.25V and V

IFB

< 540mV; V

FLT

= 2V

0.8 1.2

ISEC

< 1.25V and V

IFB

> 660mV; V

FLT

= 2V -1.5 -0.8

TFLT Charge Current

ISEC

> 1.25V and V

IFB

> 660mV; V

FLT

= 2V

115 155

µA

TFLT Trip Threshold Rising edge 3.7 4.3 V

SDA, SCL, Input Low Voltage 0.7 V

SDA, SCL, Input High Voltage 2.1 V

SDA Output Low-Sink Current V

SDA

= 0.4V 4 mA

SMBus Frequency 10 100 kHz

SMBus Free Time t

BUF

4.7 µs

SCL Serial Clock High Period t

HIGH

4µs

SCL Serial Clock Low Period t

LOW

4.7 µs

START Condition Setup Time t

SU:STA

4.7 µs

START Condition Hold Time t

HD:STA

4µs

STOP Condition Setup Time from SCL t

SU:STO

4µs

SDA Valid to SCL Rising-Edge Setup Time,

Slave Clocking in Data

SU:DAT

250 ns

SCL Falling Edge to SDA Transition t

HD:DAT

0ns

SCL Falling Edge to SDA Valid,

Reading Out Data

200 ns

Note 1: Specifications to -40°C are guaranteed by design, not production tested.

1 2 3 4 5 6 7 8 9 10 11 ... 30 31

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Rainbow-electronics MAX8759 Manual de usuario Pagina 6

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