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參數(shù)資料
| 型號(hào)： | LA8522M |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO24 |
| 封裝： | MFP-24 |
| 文件頁數(shù)： | 3/17頁 |
| 文件大?。?/td> | 334K |
| 代理商： | LA8522M |
Of the external components, the capacitors C2 and C3 are the power amplifier phase compensation capacitors. If these
capacitors are located away from the IC pin due to layout considerations, the impedance relationship will result in a
reduction in the phase compensation effect, and high band oscillator may occur.
Therefore, we recommend that the two capacitors C2 and C3 discussed above be located as close as possible to the IC
pins in the layout. However, if you find that, due to layout relationships, the circuit tends to oscillate, we recommend
that, rather than compensation using only capacitors, you use a phase compensation design with resistors (about 1 to
2.2 Ω) inserted in series with the capacitors.
If the capacitor C7 is added to the feedback resistor path, the phase of the feedback path will be delayed and capacitors
C4 and C5 will be required. Here, the time constant of the feedback resistor and C7 must be 10 μs or less (100 kΩ,
100 pF).
LA8522M ground line layout (See the figure on the following page.)
The LA8522M circuit blocks can be roughly classified as follows.
(1) Power amplifier system, (2) Crosspoint switch small-signal system
Since this block structure involves two significantly different circuit types, each block has independent VCC and
ground pins. It is best if external devices are connected to the ground line for the corresponding block, and that finally
the two block ground lines are connected to the power supply (regulator) ground, which is the final reference. In
particular, the PCB pattern should be formed with two ground lines.
There are cases, however, where a single line is used for the power supply ground due to limitations on protruding PCB
areas. In such cases, the ground line layout must be designed so that the sections of the ground line that carry large
currents (the power amplifier block) are closer to the power supply ground (and thus have a lower impedance) than the
sections of the ground line for circuits that draw smaller currents.
If the large currents drawn by the power amplifier pass through ground line that handles the lower currents from the
small-signal processing blocks, the signal path may be influenced by the ground, loops may be created, and low-band
oscillation may occur.
Therefore we recommend that the ground lines be designed as described above so that lines that carry larger amounts of
current are connected the closest to the power supply ground that serves as the reference.
Inter-pin shorting
This IC may be damaged or destroyed if power is applied with any pins shorted together. Therefore, when mounting
this IC to a printed circuit board always check for pin shorting caused by stray solder or any other foreign material
before applying power.
Load shorting
This IC may be damaged or destroyed if it is operated for extended periods with the load shorted. Do not allow the load
to be shorted.
Maximum ratings
The slightest fluctuations in operating conditions may cause the ratings to be exceeded if this IC is operated in the
vicinity of the maximum ratings. Since this can lead to destruction of the device, applications must be designed with
adequate margins with respect to the power-supply voltage and other parameters so that the maximum ratings are never
exceeded.
No. 6951-11/17
LA8522M
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| LA8601M | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
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