MAX8722C Ver la hoja de datos (PDF) - Maxim Integrated
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MAX8722C Datasheet PDF : 21 Pages
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Low-Cost CCFL Backlight Controller
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. VBATT = 12V, VCC = VDD, VSHDN = 5.4V, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Current-Limit Threshold
LX1 to PGND, LX2 to PGND
(Adjustable)
VILIM = 0.5V
VILIM = 2.0V
90
120 150
mV
380 410 440
Zero-Current Crossing Threshold
LX1 to GND, LX2 to GND
-7
0
+7
mV
Current-Limit Leading Edge
Blanking
IFB Input Voltage Range
IFB Regulation Point
IFB Input Bias Current
IFB Lamp-Out Threshold
0 < VIFB < 2V
-2V < VIFB < 0
IFB to COMP Transconductance 0.5V < VCOMP < 4V
IFB Soft-Start Disable
COMP Output Impedance
COMP Discharge Current During
Overvoltage or Overcurrent Fault
VIFB = 800mV, VISEC = 2V
240 350 460
ns
-2
+2
V
730 780 830
mV
-2
-150
+2
μA
570 600 640
mV
10
17
25
μS
1.0
1.1
1.2
V
5
10
20
M
1100
μA
COMP Soft-Start Charge Current
ISEC Overcurrent Threshold
ISEC Input Bias Current
VFB Input Bias Current
VFB Undervoltage Threshold
VFB Overvoltage Threshold
VFB Undervoltage Protection
Timeout
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
0 < VISEC < 2V
-4V < VVFB < +4V
RFREQ = 169k
RFREQ = 100k
RFREQ = 340k
RFREQ = 100k
RFREQ = 169k
RFREQ = 340k
SYNC = VCC, RFREQ = 169k
SYNC = VCC, RFREQ = 169k
SYNC = VCC, RFREQ = 169k
SYNC = VCC, RFREQ = 169k
SYNC = GND, FREQ = VCC
SYNC = VCC, FREQ = VCC
VSYNC = 2V
10
14
20
μA
1.15 1.20 1.28
V
-0.3
+0.3
μA
-25
+25
μA
340 430 520
mV
2.2
2.3
2.4
V
230 260 290
159
μs
515
343
205 210 215
Hz
106
0.8
V
2.1
V
100
mV
-0.3
+0.3
μA
3
k
3
k
0.8
V
2.1
V
70
mV
-0.3
+0.3
μA
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