Rainbow-electronics MAX8759 Bedienungsanleitung PDF herunterladen (Seite 4)

MAX8759

Low-Cost, SMBus, CCFL Backlight Controller

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V

BATT

= 12V, V

= V

DD,

= 0°C to +85°C. Typical values are at T

= +25°C, unless otherwise noted.)

PARAMETER CONDITIONS

MIN TYP MAX

UNITS

BATT

= 9V, R

THR

= 100kΩ 0

0.15 0.30

Zero-Crossing Delay

BATT

= 12V, R

THR

= 100kΩ

1.50 1.80 2.10

µs

Maximum Zero-Crossing Delay V

BATT

= 16V, R

THR

= 100kΩ 3.2 3.8 4.4 µs

DEL rising 4.5

DEL Disable Threshold

DEL falling 3.8

ISEC

< 1.25V and V

IFB

< 540mV; V

FLT

= 2V

0.9 1.0 1.1

ISEC

< 1.25V and V

IFB

> 660mV; V

FLT

= 2V -1.5 -1.2 -0.8

TFLT Charge Current

ISEC

> 1.25V and V

IFB

> 660mV; V

FLT

= 2V

115 135 155

µA

TFLT Trip Threshold Rising edge 3.7 4 4.3 V

SDA, SCL, Input Low Voltage 0.7 V

SDA, SCL, Input High Voltage 2.1 V

SDA, SCL, Input Hysteresis 100 mV

SDA, SCL, Input Bias Current -1 +1 µA

SDA Output Low Sink Current V

SDA

= 0.4V 4 mA

SMBus Frequency 10 100 kHz

SMBus Free Time t

BUF

4.7 1 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

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

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