MAX14521EETG Ver la hoja de datos (PDF) - Maxim Integrated

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MAX14521EETG

Quad, High-Voltage EL Lamp Driver with I2C Interface

Maxim Integrated 

Quad, High-Voltage EL Lamp Driver

with I2C Interface

Functional Diagram

LX

PGND CS

VDD

SPREAD SPECTRUM

AND SOFT-START

fSW OSCILLATOR

MAX14521E

FEL OSC

SHAPE CONTROL

THERMAL

SHUTDOWN

NO-OPERATION

SIGNAL

UVLO

SHDN

AUX

PWM

CONVERTER

EL PEAK

CONTROL

VSENSE

RB

I2C

HIGH

ESD

COM

PROT

HIGH

ESD

EL1

PROT

HIGH

ESD

EL2

PROT

HIGH

ESD

EL3

PROT

HIGH

ESD

EL4

PROT

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 var-

ied from 0 to 300VP-P by programming the EL_ _[4:0]

bits of the EL ramping time and EL peak voltage regis-

ters. The peak-to-peak voltage increases and decreas-

es 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 regis-

ters. 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 fea-

ture 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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