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DS3991VR Datasheet(PDF) 3 Page - Maxim Integrated Products

Part # DS3991VR
Description  Low-Cost CCFL Controller
Download  16 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

DS3991VR Datasheet(HTML) 3 Page - Maxim Integrated Products

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_______________________________________________________________________________________
3
Note 1: All voltages are referenced to ground unless otherwise noted. Currents into the IC are positive; currents out of the IC are
negative.
Note 2: During fault conditions, if AC-coupled, LCM and OVD can go below ground by up to 1V for up to 1s.
Note 3: Threshold voltage includes the DC bias-voltage offset.
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +4.5V to 5.5V, TA = -40°C to +85°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Lamp Regulation Threshold
VLRT
(Note 3)
2.29
2.35
2.41
V
OVD Threshold
VOVDT
(Note 3)
2.25
2.35
2.45
V
Lamp Frequency
LFOSCI
40
80
kHz
Lamp Frequency Tolerance
LFTOL
LOSC resistor ±0.1% over temperature;
measured from 0°C to +85°C
-5
+5
%
Burst-Dimming PWM Frequency
PFOSCI
80
300
Hz
Burst-Dimming PWM Frequency
Tolerance
PFTOL
POSC resistor ±0.1% over temperature
-5
+5
%
SLOPE = 0
0
V
BRIGHT Voltage: Minimum
Brightness
VBMIN
SLOPE = 1
3.3
V
SLOPE = 0
3.3
V
BRIGHT Voltage: Maximum
Brightness
VBMAX
SLOPE = 1
0
V
Gate-Driver Output Rise/Fall
tR/tF
CL = 600pF
100
ns
Typical Operating Characteristics
(VCC = 5.0V, TA = +25°C, unless otherwise noted.)
ACTIVE SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
5.3
5.1
4.9
4.7
3.5
4.0
4.5
5.0
5.5
6.0
3.0
4.5
5.5
DPWM = 100%
DPWM = 50%
DPWM = 10%
SVM TRIPPED
GATE QC = 4.5nC
fLOSC = 49.6kHz
ACTIVE SUPPLY CURRENT
vs. TEMPERATURE
TEMPERATURE (
°C)
22.5
4.5
5.0
5.5
6.0
4.0
-40.0
85.0
VCC = 5.5V
VCC = 5.0V
VCC = 4.5V
GATE QC = 4.5nC
fLOSC = 49.6kHz
DPWM = 100%
INTERNAL FREQUENCY CHANGE
vs. TEMPERATURE
TEMPERATURE (
°C)
22.5
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1.0
-1.0
-40.0
85.0
DPWM FREQUENCY
LAMP FREQUENCY
Low-Cost CCFL Controller


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