參數(shù)資料
型號(hào)： MAX8722
廠(chǎng)商： Maxim Integrated Products, Inc.
英文描述： Low-Cost CCFL Backlight Controller
中文描述： 低成本CCFL背光控制器
文件頁(yè)數(shù)： 5/20頁(yè)
文件大小： 331K
代理商： MAX8722
M
Low-Cost CCFL Bac klight Controller
_______________________________________________________________________________________
5
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. V
BATT
= 12V, V
CC
= V
DD
, V
SHDN
= 5.3V,
T
A
= -40°C to +85°C
, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
ILIM
= 0.5V
80
120
Current-Limit Threshold
LX1 - PGND, LX2 - PGND
(Adjustable)
V
ILIM
= 2.0V
370
430
mV
Zero-Current Crossing Threshold
LX1 - GND, LX2 - GND
1
12
mV
Current-Limit Leading Edge
Blanking
240
460
ns
IFB Input Voltage Range
IFB Regulation Point
-2
770
-2
-150
560
60
7
1.15
2.2
200
+2
810
+2
V
mV
0 < V
IFB
< 2V
-2V < V
IFB
< 0
IFB Input Bias Current
μA
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
640
160
18
1.28
2.4
218
0.8
mV
μS
M
V
V
Hz
V
V
k
k
V
V
μA
kHz
0.5V < V
COMP
< 4V
R
FREQ
= 169k
SYNC = V
CC
, R
FREQ
= 169k
SYNC = V
CC
, R
FREQ
= 169k
SYNC = GND, FREQ = V
CC
SYNC = V
CC
, FREQ = V
CC
2.1
2.4
2.4
0.8
2.1
-0.3
10
V
SYNC
= 2V
+0.3
50
CNTL Minimum Duty-Cycle
Threshold
0.20
0.26
V
CNTL Maximum Duty-Cycle
Threshold
1.9
2.1
V
SHDN
Input Low Voltage
SHDN
Input High Voltage
0.8
V
V
2.1
FREQ Dual-Mode Input High
Level
V
CC
-
0.35
V
TFLT Trip Threshold
3.95
4.20
V
Note 1:
Specifications to -40
°
C are guaranteed by design based on final characterization results.
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