参数资料
| 型号： | DS3994Z+T&R |
| 厂商： | Maxim Integrated |
| 文件页数： | 26/28页 |
| 文件大小： | 0K |
| 描述： | IC CCFL CNTRLR 4CH 28-SOIC |
| 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： | 20 ~ 80 kHz |
| 电流 - 电源： | 9mA |
| 电源电压： | 4.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 28-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC W |
| 包装： | 带卷 (TR) |
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4-Channel Cold-Cathode
Fluorescent Lamp Controller
Table 5. Transformer Specifications
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Turns Ratio (Secondary/Primary)
(Notes 1, 2, 3)
40
Frequency
Output Power
Output Current
40
5
80
6
8
kHz
W
mA
Primary DCR
Secondary DCR
Primary Leakage
Secondary Leakage
Primary Inductance
Secondary Inductance
Center tap to one end
200
500
12
185
70
500
m Ω
Ω
μH
mH
μH
mH
Center Tap Voltage
Secondary Output Voltage
100ms minimum
Continuous
10.8
2000
1000
12
13.2
V
V RMS
Note 1: Primary should be Bifilar wound with center tap connection.
Note 2: Turns ratio is defined as secondary winding divided by the sum of both primary windings.
Note 3: 40:1 is the nominal turns ratio for driving a 438mm x 2.2mm lamp with a 12V supply. Refer to Application Note 3375 for more
information.
Table 6. Resistor and Capacitor Selection Guide
DESIGNATOR
R1
R2
R3
R4
R5
R6
R7
R8
QTY
1
1
1
1
1
1
1
1/Ch
VALUE
10k Ω
12.5k Ω to
105k Ω
20k Ω to
40k Ω
18k Ω to
45k Ω
4.7k Ω
4.7k Ω
4.7k Ω
140 Ω
TOLERANCE
(%) AT 25°C
1
1
1
1
5
5
5
1
TEMPERATURE
COEFFICIENT
—
—
≤ 153ppm/°C
≤ 153ppm/°C
Any grade
Any grade
Any grade
—
NOTES
—
See the Setting the SVM Threshold Voltage section.
2% or less total tolerance. See the Lamp Frequency
Configuration section to determine value.
2% or less total tolerance. See the Lamp Frequency
Configuration section to determine value.
—
—
—
See the Setting the RMS Lamp Current section.
Capacitor value will also affect LCM bias voltage during
C1
1/Ch
100nF
10
X7R
power-up. A larger capacitor may cause a longer time
for V DCB to reach its normal operating level.
C2
1/Ch
10pF
5
±1000ppm/°C
2kV to 4kV breakdown voltage required.
Capacitor value will also affect LCM bias voltage during
C3
1/Ch
27nF
5
X7R
power-up. A larger capacitor may cause a longer time
for V DCB to reach its normal operating level.
C4
C5
1/Ch
1
33μF
0.1μF
20
10
Any grade
X7R
—
Place close to V CC and GND on DS3994.
26
____________________________________________________________________
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