|
|
PDF MAX4990E Data sheet ( Hoja de datos )
| Número de pieza | MAX4990E | |
| Descripción | High-Voltage +-15kV ESD-Protected Electroluminescent Lamp Driver | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX4990E (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
|
No Preview Available !
19-0886; Rev 0; 8/07
www.DataSheet4U.com
High-Voltage, ±15kV ESD-Protected
Electroluminescent Lamp Driver
General Description
The MAX4990E high-voltage DC-AC converter is ideal
for driving electroluminescent (EL) lamps. The
MAX4990E features a wide +2.4V to +5.5V input range
that allows the device to accept a wide variety of
voltage sources such as single-cell lithium-ion (Li+)
batteries and higher voltage battery chargers. The lamp
outputs of the device generate up to 250V peak-to-
peak output voltage for maximum lamp brightness.
The MAX4990E utilizes an inductor-based boost con-
verter to generate the high voltage necessary to drive
an EL lamp. The boost-converter switching frequency is
set with the combination of an external capacitor con-
nected from SW to GND and an external resistor con-
nected from SLEW to GND.
The MAX4990E uses a high-voltage full-bridge output
stage to convert the high voltage generated by the
boost converter to an AC waveform suitable for driving
the EL panel. The EL output switching frequency is set
with the combination of an external capacitor connect-
ed from EL to GND and an external resistor connected
from SLEW to GND.
The MAX4990E uses a proprietary acoustic noise-
reduction circuit that controls the slew rate of the AC
voltage, reducing audible noise from the EL panel. The
slew rate is set with an external resistor connected from
SLEW to GND.
The MAX4990E features an EL lamp dimming control
(DIM) that allows the user to set the EL output voltage
with a PWM signal, a DC analog voltage, or a resistor
connected from the DIM input to GND. A capacitor
placed in parallel to the resistor on DIM allows the user
to program a slow turn-on/-off time that generates a soft
fade-on/fade-off effect of the EL lamp.
The MAX4990E enters a low-power shutdown mode
(100nA max) when the EN and DIM inputs are connect-
ed to GND. The MAX4990E also enters thermal shut-
down if the die temperature rises above +158°C.
The MAX4990E is available in a space-saving, 14-pin,
3mm x 3mm TDFN package and is specified over the
extended -40°C to +85°C operating temperature range.
Typical Application Circuits appear at end of data sheet.
Features
♦ ESD-Protected EL Lamp Outputs
±15kV Human Body Model
±4kV IEC 61000-4-2 Contact Discharge
±15kV IEC 61000-4-2 Air-Gap Discharge
♦ 250VP-P (MAX) Output for Highest Brightness
♦ Wide +2.4V to +5.5V Input Voltage Range
♦ Resistor-Adjustable Slew-Rate Control for
Audible Noise Reduction
♦ Externally Driven Lamp and Switching Converter
Frequencies
♦ Capacitor-Adjustable Lamp and Switching
Converter Frequencies
♦ Low 100nA Shutdown Current
♦ DIM Input for Controlling Output Voltage Through
DC Analog Voltage, PWM, or Resistor to GND
♦ Capacitor Adjustable for Slow Turn-On/-Off
♦ Space-Saving Packages
14-Pin, 3mm x 3mm TDFN
Keypad Backlighting
MP3 Players
LCD Backlighting
Applications
PDAs/Smartphones
Automotive Instrument
Clusters
Pin Configuration
TOP VIEW
14 13 12 11 10 9 8
MAX4990E
*EP
+
1234567
TDFN-EP
*EP = EXPOSED PAD. CONNECT EP TO GND OR LEAVE UNCONNECTED.
Ordering Information
PART
MAX4990ETD+
PIN-PACKAGE
14 TDFN-EP (3mm x 3mm)
TOP
MARK
ADL
PKG
CODE
T1433-2
±15kV
PROTECTION
Yes
DIM CONTROL
Yes
SLEW-RATE
CONTROL
Yes
Note: The device operates over the -40°C to +85°C operating
temperature range.
+Denotes a lead-free package.
EP = Exposed paddle.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
www.DataSheet4U.com
High-Voltage, ±15kV ESD-Protected
Electroluminescent Lamp Driver
Typical Operating Characteristics (continued)
(VDD = +3.6V, CLAMP = 10nF, CCS = 3.3nF, LX = 220µH (ISAT = 170mA, RS = 5.5Ω), RSLEW = 390kΩ, DIM = VDD, CSW = 100pF,
CEL = 1.2nF, TA = +25°C, unless otherwise noted.)
PEAK-TO-PEAK OUTPUT VOLTAGE
vs. TEMPERATURE
210
205
PEAK-TO-PEAK OUTPUT VOLTAGE
vs. DIM VOLTAGE
300
VDD = 4.5V
250
PEAK-TO-PEAK OUTPUT VOLTAGE
vs. DIM DUTY CYCLE
300
250
200 200 200 fDIM = 200kHz
195 150 150
190 100 100
fDIM = 1MHz
185 50 50
180
-40
-15 10 35 60
TEMPERATURE (°C)
85
00
0.35 0.54 0.73 0.92 1.11 1.30 20 40 60 80
DIM VOLTAGE (V)
DIM DUTY CYCLE (%)
120
100
80
60
40
20
0
2.4
RMS OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
3.0 3.6 4.2 4.8
SUPPLY VOLTAGE (V)
5.4
EL SWITCHING FREQUENCY vs.CEL
500
RSLEW = 390kΩ
400
300
200
100
0
-100
-200
-300
-400
-500
-600
-700
-800
-900
-1000
2.4
190
AVERAGE OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
3.0 3.6 4.2 4.8
SUPPLY VOLTAGE (V)
EL SWITCHING FREQUENCY
vs. SUPPLY VOLTAGE
5.4
0
-100
-200
-300
-400
-500
-600
-700
-800
-900
-1000
-40
190
AVERAGE OUTPUT VOLTAGE
vs. TEMPERATURE
-15 10 35 60
TEMPERATURE (°C)
EL SWITCHING FREQUENCY
vs. TEMPERATURE
85
185 185
180 180
175 175
0
0.5 1.0 1.5 2.0 2.5
CEL (nF)
170
2.4
3.0 3.6 4.2 4.8
SUPPLY VOLTAGE (V)
5.4
170
-40
-15 10 35 60
TEMPERATURE (°C)
85
_______________________________________________________________________________________ 5
5 Page 
www.DataSheet4U.com
High-Voltage, ±15kV ESD-Protected
Electroluminescent Lamp Driver
RC
1MΩ
RD
1500Ω
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
HIGH-
VOLTAGE
DC
SOURCE
Cs
100pF
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
RC
50MΩ TO 100MΩ
RD
330Ω
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
HIGH-
VOLTAGE
DC
SOURCE
Cs
150pF
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
Figure 1a. Human Body ESD Test Model
Figure 1c. IEC 61000-4-2 ESD Test Model
IP 100%
90%
Ir PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
AMPS
36.8%
10%
0
0
tRL
TIME
tDL
CURRENT WAVEFORM
Figure 1b. Human Body Current Waveform
I
100%
90%
10%
tr = 0.7ns TO 1ns
30ns
60ns
t
Figure 1d. IEC 61000-4-2 ESD Generator Current Waveform
Table 1. Inductor Vendors
INDUCTOR VALUE (µH)
220
330
470
220
330
470
VENDOR
TOKO
Coilcraft
Coilcraft
Coilcraft
Coilcraft
Coilcraft
WEBSITE
www.tokoam.com
www.coilcraft.com
www.coilcraft.com
www.coilcraft.com
www.coilcraft.com
www.coilcraft.com
PART
D312C 1001BS-221M
DO1608C-334ML
DO1608C-474ML
LPS4018-224ML
LPS4018-334ML
LPS4018-474ML
The peak-to-peak voltage is adjusted by connecting a
resistor from the SLEW input to GND together with a
resistor from the DIM input to GND. The equation relating
the peak-to-peak voltage to the resistors is the following:
VP-P
=
200
×
RDIM
RSLEW
RDIM Resistor and CDIM
Capacitor Selection
The MAX4990E provides a slow turn-on/-off feature by
connecting a resistor in parallel with a capacitor con-
nected from the DIM input to GND. The reference cur-
rent IB is used to charge the resistor and capacitor.
When EN is driven to GND, IB is removed, and the volt-
age across the capacitor and resistor decay with a time
constant of RC that provides a slow turn off of the EL
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAX4990E.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX4990E | High-Voltage +-15kV ESD-Protected Electroluminescent Lamp Driver | Maxim Integrated Products |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |