MAX8722 Ver la hoja de datos (PDF) - Maxim Integrated
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MAX8722 Datasheet PDF : 20 Pages
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Low-Cost CCFL Backlight Controller
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. VBATT = 12V, VCC = VDD, VSHDN = 5.3V, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN TYP MAX
Current-Limit Threshold
LX1 - PGND, LX2 - PGND
(Adjustable)
VILIM = 0.5V
VILIM = 2.0V
80
120
370
430
Zero-Current Crossing Threshold
LX1 - GND, LX2 - GND
1
12
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
ISEC Overcurrent Threshold
VFB Overvoltage Threshold
DPWM Chopping Frequency
DPWM Input Low Voltage
DPWM Input High Voltage
DPWM Output Low Resistance
DPWM Output High Resistance
SYNC Input Low Voltage
SYNC Input High Voltage
SYNC Input Bias Current
SYNC Input Frequency Range
CNTL Minimum Duty-Cycle
Threshold
0 < VIFB < 2V
-2V < VIFB < 0
0.5V < VCOMP < 4V
RFREQ = 169kΩ
SYNC = VCC, RFREQ = 169kΩ
SYNC = VCC, RFREQ = 169kΩ
SYNC = GND, FREQ = VCC
SYNC = VCC, FREQ = VCC
VSYNC = 2V
240
-2
770
-2
-150
560
60
7
1.15
2.2
200
2.1
2.1
-0.3
10
0.20
460
+2
810
+2
640
160
18
1.28
2.4
218
0.8
2.4
2.4
0.8
+0.3
50
0.26
CNTL Maximum Duty-Cycle
Threshold
SHDN Input Low Voltage
SHDN Input High Voltage
FREQ Dual-Mode Input High
Level
TFLT Trip Threshold
1.9
2.1
0.8
2.1
VCC -
0.35
3.95
4.20
Note 1: Specifications to -40°C are guaranteed by design based on final characterization results.
UNITS
mV
mV
ns
V
mV
µA
mV
µS
MΩ
V
V
Hz
V
V
kΩ
kΩ
V
V
µA
kHz
V
V
V
V
V
V
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