MAX8722EEG Ver la hoja de datos (PDF) - Maxim Integrated

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Fabricante

MAX8722EEG

Low-Cost CCFL Backlight Controller

Maxim Integrated 

Low-Cost CCFL Backlight Controller

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1. VBATT = 12V, VCC = VDD, VSHDN = 5.3V, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.)

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

Zero-Current Crossing Threshold

LX1 to GND, LX2 to GND

1

6

12

mV

Current-Limit Leading Edge

Blanking

IFB Input Voltage Range

IFB Regulation Point

IFB Input Bias Current

IFB Lamp-Out Threshold

IFB to COMP Transconductance

COMP Output Impedance

COMP Discharge Current During

Overvoltage or Overcurrent Fault

0 < VIFB < 2V

-2V < VIFB < 0

0.5V < VCOMP < 4V

VIFB = 800mV, VISEC = 2V

240

350

460

ns

-2

+2

V

770

790

810

mV

-2

-150

+2

µA

560

600

640

mV

60

100 160

µS

7

10

18

MΩ

400

µA

COMP Discharge Current During

DPWM Off-Time

DPWM Rising to Falling Ratio

ISEC Overcurrent Threshold

ISEC Input Bias Current

VFB Input Bias Current

VFB Overvoltage Threshold

DPWM Chopping Frequency

DPWM Input Low Voltage

DPWM Input High Voltage

DPWM Input Hysteresis

DPWM Input Bias Current

DPWM Output Low Resistance

DPWM Output High Resistance

SYNC Input Low Voltage

SYNC Input High Voltage

SYNC Input Hysteresis

SYNC Input Bias Current

SYNC Input Frequency Range

CNTL Minimum Duty-Cycle

Threshold

CNTL = GND, VCOMP = 2V

VIFB = 0

0 < VISEC < 2V

VVFB = 0.5V

RFREQ = 100kΩ

RFREQ = 169kΩ

RFREQ = 340kΩ

SYNC = VCC, RFREQ = 169kΩ

SYNC = VCC, RFREQ = 169kΩ

SYNC = VCC, RFREQ = 169kΩ

SYNC = VCC, RFREQ = 169kΩ

SYNC = GND, FREQ = VCC

SYNC = VCC, FREQ = VCC

VSYNC = 2V

100

µA

2.5

1.15 1.21 1.28

V

-0.3

+0.3

µA

-0.3

+0.3

µA

2.2

2.3

2.4

V

343

204

209

214

Hz

106

0.8

V

2.1

V

100

mV

-0.3

+0.3

µA

2.4

kΩ

2.4

kΩ

0.8

V

2.1

V

100

mV

-0.3

+0.3

µA

10

50

kHz

0.20 0.23 0.26

V

CNTL Maximum Duty-Cycle

Threshold

CNTL Input Current

DPWM ADC Resolution

0 < VCNTL < VCC

Guaranteed monotonic

1.9

2.0

2.1

V

-0.1

+0.1

µA

5

Bits

_______________________________________________________________________________________ 3

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