DS3994 Maxim Integrated Products, DS3994 Datasheet - Page 22

• Manufacturer Part Number: DS3994
• Description: 4-Channel Cold Cathode Fluorescent Lamp Controller
• Manufacturer: Maxim Integrated Products

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DataSheet
4
4-Channel Cold-Cathode
Fluorescent Lamp Controller
FCh: Control Register 3 (CR3)
22
U
.com
BIT
____________________________________________________________________
0
1
2
3
4
5
6
7
SLOPE
NAME
LOFS
LST0
LST1
SB0
SB1
SB2
IGO
BRIGHT Analog Dimming Slope Select
0 = Positive Slope
1 = Negative Slope
Note: The strike frequency boost does not affect this timeout.
Invert MOSFET Gate A and Gate B Driver Outputs
0 = Do not invert GA and GB outputs.
1 = Invert GA and GB outputs.
Lamp Oscillator Frequency Select
0 = 40kHz to 80kHz
1 = 20kHz to 40kHz
LST1
SB2
0
0
1
1
0
0
0
0
1
1
1
1
LST0
SB1
0
1
0
1
0
0
1
1
0
0
1
1
LAMP OSCILLATOR =
SB0
STRIKE AND LAMP OUT TIMEOUT IN LAMP
0
1
0
1
0
1
0
1
40kHz TO 80kHz
(LOFS = 0)
131,072
32,768
65,536
98,304
LAMP STRIKE FREQUENCY BOOST SELECT
FREQUENCY BOOST
FREQUENCY CYCLES
LAMP STRIKE
100%
14%
23%
33%
46%
60%
78%
0%
LAMP OSCILLATOR =
FUNCTION
20kHz TO 40kHz
(LOFS = 1)
16,384
32,768
49,152
65,536
EXAMPLE STRIKE FREQUENCY IF
LAMP FREQUENCY IS 50kHz
EXAMPLE TIME OUT IF
LAMP FREQUENCY IS
61.5kHz
66.7kHz
100kHz
50kHz
57kHz
73kHz
80kHz
89kHz
25kHz OR 50kHz
0.66 seconds
1.31 seconds
1.97 seconds
2.62 seconds