MAX1839 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX1839 Datasheet PDF : 26 Pages
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Wide Brightness Range
CCFL Backlight Controllers
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 8.2V, VSH/SUS = VSH = 5.5V, MINDAC = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
DAC AND ERROR AMPLIFIER
DAC Resolution
Guaranteed monotonic
5
Bits
MINDAC Input Voltage Range
0
2
V
MINDAC Input Bias Current
MINDAC Digital PWM Disable
Threshold
CSAV Input Voltage Range
0 < VMINDAC < 2V
MINDAC = VL
-1
1
µA
2.4
2.9
4
V
0
0.8
V
CSAV Regulation Point
CSAV Input Bias Current
VMINDAC = 0, DAC code = 11111 binary
VMINDAC = 0, DAC code = 00001 binary
VMINDAC = 1V, DAC code = 00000 binary
188
194
200
2
6.25
16
mV
93
100
110
-1
1
µA
CSAV to CCI Transconductance
CTFB Input Voltage Range
1V < VCCI < 2.7V
100
µmho
0
2
V
CTFB Input Bias Current
-1
1
µA
CTFB Regulation Point
570
600
630
mV
CTFB to CCV Transconductance
TIMERS AND FAULT DETECTION
1V < VCCV < 2.7V
30
40
50
µmho
Chopping Oscillator Frequency
No AC signal on MODE, not synchronized
24
28
32
kHz
No AC signal on MODE
205
220
235
Digital PWM Chop-Mode Frequency
32kHz AC signal on MODE
250
Hz
100kHz AC signal on MODE
781
MODE to DPWM Sync Ratio
FMODE / FDPWM
128
Lamp-Out Detection Timeout Timer
VCSAV < CSAV
No AC signal on MODE
2.06 2.33 2.73
(Center-Tap Voltage Stuck at
lamp-out
32kHz AC signal on MODE
2.05
s
Maximum) (Note 1)
threshold
100kHz AC signal on MODE
0.66
CSAV Lamp-Out Threshold
50
75
100
mV
Fault-Detection Threshold on CCV
(Note 2)
0.4
1
V
Shorted Buck-Switch Detection
Timeout Timer (UL1950 Protection)
(Note 3)
Lamp Turn-On Delay
VCCV < fault-
detection
No AC signal on MODE
332
291
259
32kHz AC signal on MODE
256
ms
threshold on CCV 100kHz AC signal on MODE
82
After SH/SUS or SH forces device on or SH rises
4
ms
MODE Operating Voltage Range
-5.5
11
V
MODE = GND Threshold
(min Brightness = 0)
To sync DPWM oscillator, not in shutdown
(Note 4)
0.6
V
MODE = REF Threshold
(max Brightness = 0)
To sync DPWM oscillator, not in shutdown
(Note 4)
1.4
2.6
V
MODE = VL Threshold
(MAX1739 SMB Interface Mode)
To sync DPWM oscillator, not in shutdown
(Note 4)
VL - 0.6
V
MODE AC Signal Amplitude
MODE AC Signal Synchronization
Range
Peak to peak (Note 5)
2
Chopping oscillator synchronized to MODE AC
signal
32
V
100
kHz
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