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參數(shù)資料
| 型號(hào)： | SP4403 |
| 英文描述： | Low Voltage Electroluminescent Lamp Driver |
| 中文描述： | 低電壓電致發(fā)光燈驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 6/14頁(yè) |
| 文件大?。?/td> | 131K |
| 代理商： | SP4403 |
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SP4403DS/05 SP4403 Electroluminescent Lamp Driver
Copyright 2000 Sipex Corporation
6
The Switched H-Bridge Network
The H-bridge consists of two SCR structures
that act as high voltage switches. These two
switches control the polarity of how the lamp is
charged. The SCR switches are controlled by
the f
signal which is the oscillator frequency
divided by 128. For a 50kHz oscillator, the 7 flip
flops will drive f
LAMP
= 390Hz.
When the energy from the coil is released, a high
voltage spike is created triggering the SCR
switches. The direction of current flow is
determined by which SCR is enabled. One full
cycle of the H-bridge will create 128 voltage
steps from ground to 80V (typical) on EL1 and
EL2 (pins 4 and 5, respectively) which are 180
degrees out of phase from each other (see
Figure 5
). A differential representation of the
output is shown in
Figure 6
.
Fine Tuning Performance
Circuit performance of the
SP4403
can be
improved with some of the following
suggestions:
Increase EL Lamp Light Output
: By
connecting a fast recovery diode from COIL
(pin 3) to C
(pin 7), the internal diode of the
switched H-bridge network is bypassed resulting
in an increase in light output at the EL lamp.
We suggest a fast recovery diode, such as the
industry standard 1N4148, be used for D1. This
circuit connection can be found in
Figure 2.
Square Wave Output Waveform to the EL
Lamp:
A 470pF capacitor at C
(pin13) will
act as an integrating capacitor, filtering out any
coil switching spikes or ripple in the output
waveform to the EL lamp (shown if
Figure 1)
.
A designer may change the output waveform to
a square wave by using a 0.1
μ
F capacitor (shown
in
Figure 2)
at C
INT
(pin 13).
Printed Circuit Board Layout Suggestions:
The
SP4403
's high-frequency operation makes
PC layout important for minimizing ground
bounce and noise. Keep the IC's GND pin and
the ground leads of C1 and C
in
Figure 2
less
than 0.2in (5mm) apart. Also keep the
connections to L1 (pin 3) as short as possible.
To maximize output power and efficiency and
minimize output ripple voltage, use a ground
plane and solder the IC's V
SS
(pin 2) directly to
the ground plane.
EL Lamp Driver Design Challenges
There are many variables which can be optimized
for specific applications. The amount of light
emitted is a function of the voltage applied to the
lamp, the frequency at which it is applied, the
lamp material, the lamp size, and the inductor
used.
Sipex
supplies characterization charts to
aid the designer in selecting the optimum circuit
configuration (see
Figures 7
to
14
).
Sipex
will perform customer application
evaluations, using the customer's actual EL
lamp to determine the optimum operating
conditions for specific applications. For
customers considering an EL backlighting
solution for the first time,
Sipex
is able to offer
retrofitted solutions to the customer's existing
LED or non-backlit product for a thorough
electrical and cosmetic evaluation. Please
contact your local Sales Representative for
Sipex
or the
Sipex
factory directly to initiate this
valued service.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP4403EU | Low Voltage Electroluminescent Lamp Driver |
| SP4405UEB | Low Voltage Electroluminescent Lamp Driver with Regulated Output Voltage |
| SP4405 | Low Voltage Electroluminescent Lamp Driver with Regulated Output Voltage |
| SP4405EN | Low Voltage Electroluminescent Lamp Driver with Regulated Output Voltage |
| SP4405EU | Low Voltage Electroluminescent Lamp Driver with Regulated Output Voltage |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP4403EU | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage Electroluminescent Lamp Driver |
| SP4403UEB | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage Electroluminescent Lamp Driver |
| SP4405 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage Electroluminescent Lamp Driver with Regulated Output Voltage |
| SP4405EN | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage Electroluminescent Lamp Driver with Regulated Output Voltage |
| SP4405EU | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage Electroluminescent Lamp Driver with Regulated Output Voltage |
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