Rainbow-electronics MAX8709 Bedienungsanleitung PDF herunterladen (Seite 5)

MAX8709

High-Efficiency CCFL Backlight

Controller with SMBus Interface

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1. V

BATT

= 12V, V

LOT

= V

REF

, V

= V

DD,

SUS

= 5.3V, T

= -40°C to +85°C. Typical values are at T

= +25°C,

unless otherwise noted.) (Note 2)

PARAMETER CONDITIONS

MIN TYP MAX

UNITS

Lamp-Out Detection Timeout Timer V

IFB

< 0.1V (Note 1)

1.14 1.30

SDA, SCL, SUS Input Low Voltage 0.8 V

SDA, SCL, SUS Input High Voltage 2.1 V

SDA, SCL, SUS Input Bias Current -1 +1 µA

SDA Output Low Sink Current V

SDA

= 0.4V 4 mA

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

SDA Valid to SCL Rising-Edge Setup Time,

Slave Clocking-In Data

SU:DAT

250

SCL Falling Edge to SDA Transition t

HD:DAT

0ns

Note 1: Corresponds to 256 DPWM cycles.

Note 2: Specifications to -40°C are guaranteed by design based on final characterization results.

Typical Operating Characteristics

(Circuit of Figure 1. V

BATT

= 12V, V

LOT

= V

REF

, V

= V

DD,

SUS

= 5.3V, T

= +25°C, unless otherwise noted.)

LOW INPUT-VOLTAGE

OPERATION (V

BATT

= 8V)

MAX8709 toc01

A: V

IFB

, 2V/div

B: V

VFB

, 2V/div

C: V

LX1

, 10V/div

D: V

LX2

, 10V/div

10µs/div

0V A

HIGH INPUT-VOLTAGE

OPERATION (V

BATT

= 20V)

MAX8709 toc02

A: V

IFB

, 2V/div

B: V

VFB

, 2V/div

C: V

LX1

, 10V/div

D: V

LX2

, 10V/div

10µs/div

0V A

LINE-TRANSIENT RESPONSE

MAX8709 toc03

A: V

BATT

, 5V/div

B: V

IFB

, 2V/div

C: V

VFB

, 2V/div

D: V

LX1

, 10V/div

40µs/div

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