Rainbow-electronics MAX8759 Manual de usuario descargar pdf (Pagina 3)

MAX8759

Low-Cost, SMBus, CCFL Backlight Controller

_______________________________________________________________________________________ 3

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

0 < V

IFB1,2

< 3V -3 +3

IFB1, IFB2 Input Bias Current

-3V < V

IFB1,2

< 0

-230

µA

IFB1, IFB2 Lamp-Out Threshold 575 600 625 mV

IFB1, IFB2 to COMP Transconductance 0.5V < V

COMP

< 4V 60 100 160 µS

COMP Output Impedance 61224MΩ

COMP Discharge Current During Overvoltage

or Overcurrent Fault

VFB

= 2.6V or V

ISEC

= 1.5V 500

1000 2000

µA

COMP Discharge Current During DPWM

Off-Time

COMP

= 1.5V 90 110 130 µA

DPWM Rising-to-Falling Ratio V

IFB1,2

= 0 2.5

ISEC Input Voltage Range -3 +3 V

ISEC Overcurrent Threshold

1.18 1.21 1.26

ISEC Input Bias Current V

ISEC

= 1.25V

-0.3 +0.3

µA

VFB Input Voltage Range -4 +4 V

VFB Input Impedance 150 300 450 MΩ

VFB Overvoltage Threshold 2.1 2.3 2.5 V

VFB Undervoltage Threshold 210 240 280 mV

VFB Undervoltage Delay R

FREQ

= 169kΩ 250 µs

FREQ

= 169kΩ, T

= +25°C to +85°C

207 210

213

FREQ

= 169kΩ

205 210

215

FREQ

= 340kΩ 106

DPWM Oscillator Frequency

FREQ

= 100kΩ 343

PWMO Output Impedance 20 40 60 kΩ

PWMI Input Low Voltage 0.7 V

PWMI Input High Voltage 2.1 V

PWMI Input Hysteresis 300 mV

PWMI Input Bias Current

-0.3 +0.3

µA

PWMI Input Frequency Range 5 50 kHz

PWMI Full-Range Accuracy 5 LSB

PWMI duty cycle = 100% 98 100

PWMI duty cycle = 50% 48 50 52PWMI Brightness Setting

PWMI duty cycle = 0% 9.7

10.0 10.3

ALS Full-Adjustment Range 0 1.8 V

ALS Full-Range Accuracy 5 LSB

ALS Input Bias Current

-0.1 +0.1

µA

VALS Output Voltage

MAX8759 is enabled, 6V < V

BATT

< 28V,

LOAD

= 1mA

5.10 5.30 5.50

VALS Leakage Current MAX8759 is disabled, VALS = GND -3 +3 µA

VALS On-Resistance MAX8759 is enabled 30 60 Ω

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

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Rainbow-electronics MAX8759 Manual de usuario Pagina 3

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