MAX14514 Datasheet, PDF (8/14 Pages) Maxim Integrated Products – Dual Electroluminescent Lamp Driver

Dual Electroluminescent Lamp Driver
Pin Description
PIN
NAME
FUNCTION
High-Voltage Output 1 Dimming Control. Apply a PWM signal, DC analog control signal, or connect a
1
DIM1 resistor from DIM1 to GND to adjust V1 peak-to-peak output voltage. Drive DIM1 high or leave DIM1
unconnected to set V₁ to full brightness level.
High-Voltage Output 2 Dimming Control. Apply a PWM signal, DC analog control signal, or connect a
2
DIM2 resistor from DIM2 to GND to adjust V2 peak-to-peak output voltage. Drive DIM2 high or leave DIM2
unconnected to set V₂ to full brightness level.
3
CAP
Turn-On Time Input. For fast turn-on mode, connect CAP to V_DD. For slow turn-on/-off mode, connect a
capacitor from CAP to GND to set the turn-on/-off time. t_ON/OFF = 0.27 x C_CAP x R_SLEW.
EL Voltage Switching Frequency. Connect an external capacitor, C_EL, from EL to GND or drive EL with
4
EL
an external oscillator to set the switching frequency of the V₁ and V₂ high-voltage outputs. Connect EL
to GND to shut off the EL oscillator.
Boost Converter Switching Frequency. Connect an external capacitor, C_SW, from SW to GND or drive
with an external oscillator to set the switching frequency of the boost converter. Connect SW to GND to
5
SW
shut off the boost oscillator. To avoid LX shorting to GND and causing an increase in internal die
temperature, do not keep SW high. The MAX14514 is protected by entering a thermal-shutdown state.
(See the Thermal Short-Circuit Protection section.)
6
V_DD
Input Supply Voltage
7
GND Ground
8
LX
Internal Switching DMOS Drain Connection. Connect LX to a switching inductor and an anode of a
rectifying diode.
9
CS
High-Voltage Feedback Connection. Connect CS to output of boost converter (cathode of rectifying diode).
10
COM High-Voltage EL Panel Common Output. Connect COM to common side of EL lamp.
11
V₂
High-Voltage EL Panel Output 2. Connect V₂ to non-COM side of EL lamp 2.
12
V₁
High-Voltage EL Panel Output 1. Connect V₁ to non-COM side of EL lamp 1.
13
EN
Enable Input. Drive EN > V_{IH_EN} to turn on the device. Drive EN < V_{IL_EN} to turn off the device (see the
Shutdown section).
14
SLEW
High-Voltage Slew-Rate Control. Connect an external resistor, R_SLEW, from SLEW to GND to set the
slew rate of the high-voltage outputs V₁ and V₂.
⎯
EP
Exposed Pad. Connect EP to GND.
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