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參數(shù)資料
| 型號(hào)： | MX881R |
| 廠商： | IXYS CORP |
| 元件分類： | 顯示驅(qū)動(dòng)器 |
| 中文描述： | LED DISPLAY DRIVER, PDSO16 |
| 封裝： | 3 X 5 MM, DFN-16 |
| 文件頁(yè)數(shù)： | 4/13頁(yè) |
| 文件大?。?/td> | 398K |
| 代理商： | MX881R |
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MX881
12
7/30/07
MX881
IXYS
Layout Notes:
Parasitic capacitance on node VSEC or VPRI will cause loss of efficiency. Keep wires on this
node as short as possible.
Parasitic inductance on the transformer connections can cause overshoot during switching that
could damage the part. Keep connections from the capacitors and MX881 to the transformer
short.
Also keep the connection from pin 2 of D1 to C3 as short as possible.
The VFB node is sensitive to coupling from T1 and the VSEC node. The VSEC node ramps to
over 300 volts in just a few nano-seconds. Keep R1, R2, and R3 as far from T1 as possible. If
possible, shield resistors by placing on the other side of the board from T1.
VCC should be well bypassed to average charge current to the battery and reduce noise to
analog circuits within MX881.
VFB is a very fast and short pulse. Keep VFB connection to R7 short to minimize capacitance on
this node. If VFB has too much capacitance, the feedback voltage may be filtered so that the
output voltage does not stop at 330V but continues to a much higher voltage.
A good ground plane is extremely important. Large pulse currents of 0.7 amps will be flowing in
the ground. The large bottom pad of the MX881 is the only ground pad and requires a low
impedance return to C1, C2, and R7.
The ground plane must have adequate clearance from high voltage nodes VHV and VSEC to
avoid arcing. Also, the node connecting R1 to R2 will be at approximately 170V.
R1 and R2 must be at least 1206 size surface mount to withstand 200V each.
Transformer
For 330V charger, the transformer should have a turns ratio of approximately 10 to insure that the fly-
back voltage on the primary side of the transformer does not damage the power switch internal to the
MX881. The fly-back voltage should be equal to the output voltage divided by the turns ratio plus the
VCC supply voltage. The fly-back voltage will be greater than this due to the energy stored in the
transformer leakage inductance. The actual voltage will depend on the transformer leakage inductance
and the parasitic capacitance of the circuits and layout.
The MX881 is designed to work with a transformer having a primary inductance of approximately 10H.
Larger values are acceptable as long as leakage inductance is small. Smaller primary inductance values
may cause feedback pulses that are too short and lead to higher than expected output voltage.
IXYS Corporation makes no representations or warranties with respect to the accuracy or completeness of the contents of this
publication and reserves the right to make changes to specifications and product descriptions at any time without notice. Neither
circuit patent licenses nor indemnity are expressed or implied. Except as set forth in IXYS’ Standard Terms and Conditions of Sale,
IXYS Corporation assumes no liability whatsoever, and disclaims any expressed or implied warranty, relating to its products
including, but not limited to, the implied warranty of merchantability, fitness for a particular purpose, or infringement of any
intellectual property right
Drawing No. 088109
www.claremicronix.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MX881RTR | 功能描述:LED照明驅(qū)動(dòng)器 Amps V RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| MX882 | 制造商:Behringer 功能描述:ULTRALINK Pro 8 Channel Splitter / Mixer 制造商:BEHRINGER 功能描述:ULTRALINK PRO 8 INPUT LINE SPLITTER / MIXER |
| MX882AEST | 制造商:BLACK BOX 功能描述:FIBRE OPTIC MULTIPLEXER |
| MX-883 | 制造商:MURATA 制造商全稱:Murata Manufacturing Co., Ltd. 功能描述:Precision, High-Speed 8-Channel, Analog Multiplexers |
| MX884 | 制造商:IXYS 制造商全稱:IXYS Corporation 功能描述:High-Side Current Monitor With 10-Bit Serial Digital Output |
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