MAX14521E_15 Datasheet, PDF (9/21 Pages) Maxim Integrated Products – Quad, High-Voltage EL Lamp Driver with I2C Interface

MAX14521E
Functional Diagram
Quad, High-Voltage EL Lamp Driver
with I²C Interface
V_DD
SPREAD SPECTRUM
AND SOFT-START
f_SW OSCILLATOR
MAX14521E
FEL OSC
SHAPE CONTROL
THERMAL
SHUTDOWN
UVLO
SHDN
AUX
PWM
CONVERTER
NO-OPERATION
SIGNAL
EL PEAK
CONTROL
LX
PGND CS
V_SENSE
DMOS
DRIVER
HALF
H-BRIDGE
HIGH
ESD
PROT
COM
HALF
H-BRIDGE
HIGH
ESD
PROT
EL1
HALF
H-BRIDGE
HIGH
ESD
PROT
EL2
HALF
H-BRIDGE
HIGH
ESD
PROT
EL3
RB
HALF
H-BRIDGE
HIGH
ESD
PROT
EL4
I²C
SDA
SCL
A1
A0
GND
EL Output Voltage
The shape, slope, frequency, ramp-on/-off times, and
peak-to-peak voltage of the MAX14521E lamp outputs
are programmed using internal registers.
The MAX14521E is capable of producing output wave-
forms with varying shapes and slew rates. The user sets
the shape and slew rate of the output using bits in the EL
shape registers.
The MAX14521E EL lamp output frequency uses an
internal EL oscillator to set the desired frequency. The
output frequency is adjusted by the FEL[7:0] bits of the
EL output frequency register. The EL frequency increases
and decreases linearly with FEL[7:0].
The peak-to-peak voltage of the EL lamp output is varied
from 0 to 300V_P-P by programming the EL_ _[4:0] bits of
the EL ramping time and EL peak voltage registers. The
peak-to-peak voltage increases and decreases linearly
with EL_ _[4:0].
The MAX14521E also features a slow fade-on and slow
fade-off time feature programmed by the RT_ _ [2:0] bits
of the EL ramping time and EL peak voltage registers.
This slow fade-on/-off feature causes the peak-to peak
voltage of the EL outputs to slowly rise from the previously
set value to the maximum set value. This feature also
causes the peak-to-peak voltage of the EL outputs to fall
from the maximum set value to zero when the device is
placed into shutdown. The slow rise and fall of the peak-
to-peak EL output voltage creates a soft fade-on and
fade-off of the EL lamp.
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