參數(shù)資料
型號(hào)： DS3994
廠商： Maxim Integrated Products, Inc.
英文描述： 4-Channel Cold-Cathode Fluorescent Lamp Controller
中文描述： 4通道冷陰極熒光燈控制器
文件頁(yè)數(shù)： 25/28頁(yè)
文件大?。?/td> 557K
代理商： DS3994
D
4-Channel Cold-Cathode
Fluorescent Lamp Controller
____________________________________________________________________
25
Figure 12. I
2
C Communications Examples
X
X
X
X
X
X
X
X
1
0
1
0
A
0
0
0
0
COMMUNICATIONS KEY
WRITE A SINGLE BYTE
8-BITS ADDRESS OR DATA
WHITE BOXES INDICATE THE MASTER IS
CONTROLLING SDA
NOTES
2) THE FIRST BYTE SENT AFTER A START CONDITION IS
ALWAYS THE SLAVE ADDRESS FOLLOWED BY THE
READ/WRITE BIT.
SHADED BOXES INDICATE THE SLAVE IS
CONTROLLING SDA
START
ACK
NOT
ACK
S
S
A
A
A
P
DATA
MEMORY ADDRESS
1
0
1
0
A
0
0
0
0
1
0
1
0
A
0
1
0
0
READ A SINGLE BYTE
S
A
A
SR
A
N
P
DATA
MEMORY ADDRESS
A
P
N
SR
STOP
REPEATED
START
1) ALL BYTES ARE SENT MOST SIGNIFICANT BIT FIRST.
Applications Information
Addressing Multiple DS3994s On a
Common I
2
C Bus
Each DS3994 responds to one of two possible slave
addresses based on the state of the address input (A
0
).
For information about device addressing see the
I
2
C
Communications
section.
Power-Supply Decoupling
To achieve best results, it is recommended that each
V
CC
pin is decoupled with a 0.01μF or a 0.1μF capacitor
to GND. Use high-quality, ceramic, surface-mount capac-
itors, and mount the capacitors as close as possible to
the V
CC
and GND pins to minimize trace inductance.
Setting the RMS Lamp Current
Resistor R8 in the typical operating circuit (Figure 13)
sets the lamp current. R8 = 140
corresponds to a
5mA
RMS
lamp current as long as the current waveform
is approximately sinusoidal. The formula to determine
the resistor value for a given sinusoidal lamp current is:
Component Selection
External component selection has a large impact on the
overall system performance and cost. The two most
important external components are the transformers
and n-channel MOSFETs.
The transformer should be able to operate in the 20kHz
to 80kHz frequency range of the DS3994, and the turns
ratio should be selected so the MOSFET drivers run at
28% to 35% duty cycle during steady state operation.
The transformer must be able to withstand the high
open-circuit voltage that will be used to strike the lamp.
Additionally, its primary/secondary resistance and
inductance characteristics must be considered
because they contribute significantly to determining the
efficiency and transient response of the system. Table 5
shows a transformer specification that has been utilized
for a 12V inverter supply, 438mm x 2.2mm lamp design.
The n-channel MOSFET must have a threshold voltage
that is low enough to work with logic-level signals, a low
on-resistance to maximize efficiency and limit the n-
channel MOSFET
’
s power dissipation, and a break-
down voltage high enough to handle the transient. The
breakdown voltage should be a minimum of 3x the
inverter voltage supply. Additionally, the total gate
charge must be less than Q
G
, which is specified in the
Recommended DC Operating Conditions
table. These
specifications are easily met by many of the dual n-
channel MOSFETs now available in SO-8 packages.
Table 6 lists suggested values for the external resistors
and capacitors used in the typical operating circuit.
R
I
LAMP RMS
8
1
2
×
(
)
=
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