MAX8722C 查看數據表（PDF） - Maxim Integrated

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MAX8722C

Low-Cost CCFL Backlight Controller

Maxim Integrated 

Low-Cost CCFL Backlight Controller

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1. VBATT = 12V, VCC = VDD, V SHDN = 5.4V, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)

PARAMETER

Current-Limit Threshold

LX1 - PGND, LX2 - PGND

(Adjustable)

VILIM = 0.5V

VILIM = 2.0V

CONDITIONS

MIN TYP MAX

90

150

380

440

Zero-Current Crossing Threshold

LX1 - GND, LX2 - GND

-7

+7

Current-Limit Leading Edge

Blanking

240

IFB Input Voltage Range

-2

IFB Regulation Point

720

IFB Input Bias Current

IFB Lamp-Out Threshold

0 < VIFB < 2V

-2V < VIFB < 0

-2

-150

560

IFB to COMP Transconductance 0.5V < VCOMP < 4V

10

IFB Soft-Start Disable

IFB/rising

1

COMP Output Impedance

5

COMP Soft-Start Charge Current

10

ISEC Overcurrent Threshold

1.15

VFB Overvoltage Threshold

2.2

VFB Undervoltage Threshold

340

VFB Undervoltage Protection

Timeout

RFREQ = 169k

230

DPWM Chopping Frequency

RFREQ = 169k

205

DPWM Input Low Voltage

SYNC = VCC, RFREQ = 169k

DPWM Input High Voltage

SYNC = VCC, RFREQ = 169k

2.1

DPWM Output Low Resistance SYNC = GND, FREQ = VCC

DPWM Output High Resistance SYNC = VCC, FREQ = VCC

SYNC Input Low Voltage

SYNC Input High Voltage

2.1

SYNC Input Frequency Range

20

SHDN Input Low Voltage

SHDN Input High Voltage

2.1

TFLT Trip Threshold

3.95

Note 1: Specifications to -40°C are guaranteed by design based on final characterization results.

460

+2

840

+2

650

25

1.2

20

20

1.28

2.4

520

290

215

0.8

3.0

3.0

0.8

100

0.8

4.20

UNITS

mV

mV

ns

V

mV

μA

mV

μS

V

M

mA

V

V

mV

μs

Hz

V

V

k

k

V

V

kHz

V

V

V

_______________________________________________________________________________________ 5

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