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SP4425 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 4 Page - Sipex Corporation

๋ถ€ํ’ˆ๋ช… SP4425
์ƒ์„ธ๋‚ด์šฉ  Electroluminescent Lamp Driver Low Voltage Applications
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์ œ์กฐ์‚ฌ  SIPEX [Sipex Corporation]
ํ™ˆํŽ˜์ด์ง€  http://www.sipex.com
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SP4425 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 4 Page - Sipex Corporation

 
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SP4425DS/20
SP4425 Electroluminescent Lamp Driver
ยฉ Copyright 2000 Sipex Corporation
4
THEORY OF OPERATION
The SP4425 is made up of three basic circuit
elements, an oscillator, coil, and switched H-bridge
network. The oscillator provides the device with
an on-chip clock source used to control the charge
and discharge phases for the coil and lamp. An
external capacitor connected between pins 1 and
V
SS allows the user to vary the oscillator frequency.
For a given choice of coil inductance there will be
an optimum C
OSC Capacitor value that gives the
maximum light output.
The suggested oscillator frequency is 25.6kHz
(C
OSC=180pF). The oscillator output is internally
divided to create the control signal for f
LAMP. The
oscillator output is internally divided down by 6
flip flops, a 25.6kHz signal will be divided into 6
frequency levels: 12.8kHz, 6.4kHz, 3.2kHz,
1.6kHz, 800Hz, and 400Hz. The oscillator output
(25.6kHz) is used to drive the coil (see figure 2 on
page 11) and the sixth flip flop output (300Hz) is
used to drive the lamp. Although the oscillator
frequency can be varied to optimize the lamp
output, the ratio of f
COIL/fLAMP will always equal 64.
The coil is an external component connected from
V
BATTERY to pin 3 of the SP4425. VBATTERY= 1.5
VDC with a 470
ยตH/4โ„ฆ coil are typical conditions.
Energy is stored in the coil according to the equation
E
L=1/2LI
2, where I is the peak current flowing in
PIN DESCRIPTION
Pin 1 โ€“ C
OSC- Capacitor input 1, connect Capacitor
from V
SS to Pin 1 to set COSC frequency.
Pin 2 โ€“ V
SS- Power supply common, connect to
ground.
Pin 3 โ€“ Coil- Coil input, connect coil from V
DD
to pin 3.
Pin 4 โ€“ D1- Diode Cathode connection.
โ€“ C
INT- Integrator capacitor, connect capacitor
from pin 4 to ground to minimize coil glitch energy.
Pin 5 โ€“ Lamp- Lamp driver output2, connect to
EL lamp.
Pin 6 โ€“ Lamp- Lamp driver output1, connect to
EL lamp.
Pin 7 โ€“ V
DD- Power supply for driver, connect to
system V
DD.
Pin 8 โ€“ HON- Enable for driver operation,
high = active; low = inactive.
1
2
3
4
8
7
6
5
SP4425 Schematic
Q
Q
HON
SCR1
SCR2
OSC
FF1
FF6
EL Lamp
1M
โ„ฆ
VDD
Coil
5
6
EL2
EL1
1
Cap1
2
VSS
VBATTERY
VDD
7
3
470
ยตH/4โ„ฆ
8
180pF
IN4148
4
D1
.1
ยตF
COSC
Low ESR
decoupling
capacitor
CINT=1800pF typ
fCOIL
fLAMP
fLAMP


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