MAX14521E_15 Datasheet, PDF (13/21 Pages) Maxim Integrated Products – Quad, High-Voltage EL Lamp Driver with I2C Interface

MAX14521E
Quad, High-Voltage EL Lamp Driver
with I²C Interface
EL Shape Register (0x03)
Damping Enable (ENDAMP)
1 = Active damping on LX node enabled.
0 = Active damping on LX node disabled.
ENDAMP = 1 actively damps the oscillation on the LX pin
and could reduce EMI.
EL Shape (SHAPE1/SHAPE0)
SHAPE[1:0] sets the desired EL output waveform; see
Tables 5 and 6.
EL Slew Rate (SL1/SL0)
SL[1:0] sets the slope of the EL output; see Table 7.
Boost-Converter Frequency Register
(0x04)
Spread Spectrum (SS1/SS0)
SS[1:0] sets the spread-spectrum modulation frequency
to a fraction of the boost-converter frequency; see
Tables 8 and 9.
Boost-Converter Switching Frequency
(FSW[4:0])
FSW4 sets the switching frequency range of the boost
converter and FSW[3:0] sets the switching frequency
within the frequency range; see Table 10. The frequency
range for FSW4 = 0 is 800kHz–1600kHz. The frequency
range for FSW4 = 1 is 400kHz–800kHz. FSW[3:0] =
0000 sets the frequency to the minimum value of the fre-
quency range. FSW[3:0] = 1111 sets the frequency to the
maximum value of the frequency range. Boost-converter
switching frequency increases linearly with FSW[3:0].
Table 5. EL Shape Configuration
REGISTER
B7
B6
B5
0x03
X
ENDAMP
X
X = Don’t Care
B4
B3
B2
B1
B0
X
SHAPE1
SHAPE0
SL1
SL0
Table 6. EL Output Shape Configuration
SHAPE[1:0]
0X
10
11
EL OUTPUT SHAPE
Sine
Do Not Use
Do Not Use
X = Don’t Care
Table 7. EL Slope Configuration
SL[1:0]
00
01
10
11
EL OUTPUT SLOPE
Sine
Fast Slope
Faster Slope
Fastest Slope
(Square Wave)
Table 8. Boost-Converter Configurations
REGISTER
B7
B6
0x04
SS1
SS0
B5
B4
X
FSW4
X = Don’t Care
B3
FSW3
B2
FSW2
B1
FSW1
B0
FSW0
Table 9. Spread-Spectrum Configuration
SS[1:0]
00
01
10
11
SPREAD SPECTRUM
Disabled
1/8
1/32
1/128
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