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参数资料
| 型号： | DS3882E+T&R/C |
| 厂商： | Maxim Integrated |
| 文件页数： | 28/31页 |
| 文件大小： | 0K |
| 描述： | IC AUTO CCFL CTRLR 2CH 28-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1,000 |
| 类型： | CCFL 控制器 |
| 频率： | 40 ~ 100 kHz |
| 电流 - 电源： | 12mA |
| 电源电压： | 4.75 V ~ 5.25 V |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 28-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 28-TSSOP |
| 包装： | 带卷 (TR) |
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Dual-Channel Automotive CCFL Controller
COMMUNICATIONS KEY
NOTES
S
P
START
STOP
A
N
ACK
NOT
ACK
WHITE BOXES INDICATE THE MASTER IS
CONTROLLING SDA
SHADED BOXES INDICATE THE SLAVE IS
CONTROLLING SDA
1) ALL BYTES ARE SENT MOST SIGNIFICANT BIT FIRST.
2) THE FIRST BYTE SENT AFTER A START CONDITION IS
ALWAYS THE SLAVE ADDRESS FOLLOWED BY THE
SR
REPEATED
START
X
X
X
X
X
X
X
X
8-BITS ADDRESS OR DATA
READ/WRITE BIT.
WRITE A SINGLE BYTE
S
1 0
1
0 0 A 1 A 0 0
A
MEMORY ADDRESS
A
DATA
A
P
READ A SINGLE BYTE
S
1 0
1
0 0 A 1 A 0 0
A
MEMORY ADDRESS
A
SR
1 0
1
0 0 A 1 A 0 1
A
DATA
N
P
Figure 11. I 2 C Communications Examples
Applications Information
Addressing Multiple DS3882s
On a Common I 2 C Bus
Each DS3882 responds to one of four possible slave
addresses based on the state of the address input pins
(A0 and A1). For information about device addressing,
see the I 2 C Communication section.
Setting the RMS Lamp Current
Resistor R7 and R8 in the Typical Operating Circuit set
the lamp current. R7 and R8 = 140 Ω 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:
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 is used to strike the lamp.
Additionally, its primary/secondary resistance and induc-
tance characteristics must be considered because they
contribute significantly to determining the efficiency and
transient response of the system. Table 10 shows a
transformer specification that has been used 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
R 7 / 8 =
1
I LAMP ( RMS ) x
2
breakdown voltage should be a minimum of 3x the invert-
er voltage supply. Additionally, the total gate charge must
be less than Q G , which is specified in the Recommended
Operating Conditions table. These specifications are eas-
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 40kHz
to 80kHz frequency range of the DS3882, and the turns
ily met by many of the dual n-channel MOSFETs now
available in 8-pin SO packages.
Table 11 lists suggested values for the external resistors
and capacitors used in the Typical Operating Circuit.
28
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