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参数资料
| 型号： | MAX8785ETI+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 17/19页 |
| 文件大小： | 0K |
| 描述： | IC CCFL CTRL 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 类型： | CCFL 控制器 |
| 电流 - 电源： | 1.5mA |
| 电源电压： | 4.5 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 管件 |
Full-Bridge Controller for
Piezoelectric Transformers
Setting the Fault Delay Time
The TFLT capacitor determines the delay time for both
open-lamp fault and arc fault. The MAX8785A charges
the TFLT capacitor with a 0.75μA current source during
open-lamp fault and charges the TFLT capacitor with a
2.8mA current source during an arc fault and sec-
ondary short circuit. The MAX8785A sets the fault latch
when the TFLT voltage reaches 3V. Use the following
equations to calculate the open-lamp fault delay
(t OPEN_LAMP ), arc fault (t ARC ), and secondary short-cir-
cuit delay (t SHORT_CIRCUIT ):
1) Keep the high-current paths short and wide, espe-
cially at the ground terminals. This is essential for
stable, jitter-free operation and high efficiency.
2) Use a star ground configuration for power and ana-
log grounds. The power and analog grounds should
be completely isolated, meeting only at the center of
the star. The center should be placed at the analog
ground pin (GND).
3) Route high-speed switching nodes away from sen-
sitive analog areas (V CC , RATE, HF, LF, COMP,
and TFLT).
t OPEN _ LAMP =
C TFLT × 3 V
0 . 75 μ A
4) Mount the decoupling capacitor from V CC to GND as
close as possible to the IC with dedicated traces that
are not shared with other signal paths.
t ARC =
t SHORT _ CIRCUIT =
C TFLT × 3 V
2 . 8 mA
C TFLT × 3 V
2 . 8 mA
Bootstrap Capacitors
The high-side gate drivers are powered using two boot-
strap circuits. The MAX8785A integrates the bootstrap
diodes so only two 0.1μF bootstrap capacitors are
needed. Connect the capacitors between LX1 and
BST1 and between LX2 and BST2 to complete the
bootstrap circuits.
Layout Guidelines
Careful PC board layout is important to achieve stable
operation. The high-voltage sections and the switching
section of the circuit require particular attention. The
high-voltage sections of the layout need to be well sep-
arated from the control circuit. Follow these guidelines
for good PC board layout:
5) The current-sense paths for LX to GND must be
made using Kelvin-sense connections to guarantee
the current-limit accuracy. With 8-pin SO MOSFETs,
this is best done by routing power to the MOSFETs
from outside using the top copper layer, while con-
necting GND and LX inside (underneath) the 8-pin
SO package.
6) Ensure the feedback connections are short and
direct. To the extent possible, IFB, VFB, and OLF
connections should be far away from the high-voltage
traces and the transformer.
7) To the extent possible, high-voltage trace clearance
on the transformer’s secondary should be widely
separated. The high-voltage traces should also be
separated from adjacent ground planes to prevent
lossy capacitive coupling.
______________________________________________________________________________________
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8785ETI+ | 功能描述:显示驱动器和控制器 Full-Bridge CCFL Controller RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX8785ETI+T | 功能描述:显示驱动器和控制器 Full-Bridge CCFL Controller RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX8785EVKIT | 功能描述:显示开发工具 MAX8785 Eval Kit RoHS:否 制造商:4D Systems 产品:4Display Shields 工具用于评估:?OLED-160-G1, ?OLED-160-G2 接口类型:Serial 工作电源电压:5 V |
| MAX8786GTL+ | 制造商:Maxim Integrated Products 功能描述:CONVERTOR - Bulk 制造商:Rochester Electronics LLC 功能描述: |
| MAX878LCSA | 制造商:Maxim Integrated Products 功能描述: |
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