MAX14521E Datasheet, PDF (13/20 Pages) Maxim Integrated Products – Quad, High-Voltage EL Lamp Driver with I2C Interface

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 frequen-
cy 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-con-
verter switching frequency increases linearly with
FSW[3:0].
Table 5. EL Shape Configuration
REGISTER
B7
B6
B5
0x03
X = Don’t Care
X
ENDAMP
X
B4
B3
B2
B1
B0
X
SHAPE1 SHAPE0
SL1
SL0
Table 6. EL Output Shape Configuration
SHAPE[1:0]
EL OUTPUT SHAPE
0X
Sine
10
Do Not Use
11
X = Don’t Care
Do Not Use
Table 8. Boost-Converter Configurations
REGISTER
B7
B6
B5
0x04
SS1
SS0
X
X = Don’t Care
Table 7. EL Slope Configuration
SL[1:0]
EL OUTPUT SLOPE
00
Sine
01
Fast Slope
10
Faster Slope
11
Fastest Slope
(Square Wave)
B4
FSW4
B3
FSW3
B2
FSW2
B1
FSW1
B0
FSW0
Table 9. Spread-Spectrum Configuration
SS[1:0]
SPREAD SPECTRUM
00
Disabled
01
1/8
10
1/32
11
1/128
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