参数资料
| 型号： | ISL1539IVEZ-T7 |
| 厂商： | Intersil |
| 文件页数： | 2/11页 |
| 文件大小： | 0K |
| 描述： | IC VDSL2 LINE DVR AMP 24HTTSOP |
| 标准包装： | 1,000 |
| 类型： | 驱动器 |
| 驱动器/接收器数： | 4/4 |
| 规程： | VDSL2 |
| 电源电压： | ±5 V ~ 15 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 24-HTSSOP |
| 包装： | 带卷 (TR) |
ISL1539
10
Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems as noted
in the quality certifications found at www.intersil.com/en/support/qualandreliability.html
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time
without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be
accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
FN7516.4
June 21, 2013
For additional products, see www.intersil.com/en/products.html
where:
TJUNCT is the maximum die temperature (+150°C)
TAMB is the maximum ambient temperature
PDISS is the dissipation calculated above
θJA is the junction to ambient thermal resistance for the
package when mounted on the PCB
This
θJA value is then used to calculate the area of copper
needed on the board to dissipate the power.
The IRE and QFN power packages are designed so that heat may
be conducted away from the device in an efficient manner. To
disperse this heat, the bottom diepad is internally connected to
the mounting platform of the die. Heat flows through the diepad
into the circuit board copper, then spreads and convects to air.
Thus, the ground plane on the component side of the board
becomes the heatsink. This has proven to be a very effective
technique.
θJA of +30°C/W can be achieved.
Single Supply Operation
The ISL1539 can also be powered from a single supply voltage.
When operating in this mode, the GND pins can still be
connected directly to GND. To calculate power dissipation, the
equations in the previous section should be used, with VS equal
to half the supply rail.
Output Loading
While the drive amplifiers can output in excess of 450mA
transiently, the internal metallization is not designed to carry
more than 75mA of steady DC current and there is no
current-limit mechanism. This allows safely driving rms
sinusoidal currents of 2mAx75mA, or 150mA. This current is
more than that required to drive line impedances to large output
levels, but output short circuits cannot be tolerated. The series
output resistor will usually limit currents to safe values in the
event of line shorts. Driving lines with no series resistor is a
serious hazard.
Power Supplies
The power supplies should be well bypassed close to the
ISL1539. A 3.3F tantalum capacitor for each supply works well.
Since the load currents are differential, they should not travel
through the board copper and set up ground loops that can
return to amplifier inputs. Due to the class AB output stage
design, these currents have heavy harmonic content. If the
ground terminal of the positive and negative bypass capacitors
are connected to each other directly and then returned to circuit
ground, no such ground loops will occur. This scheme is
employed in the layout of the EL1537 demonstration board, and
documentation can be obtained from the factory.
Power Control Function
The ISL1539 contains two forms of power control operation. Two
digital inputs, C0 and C1, can be used to control the supply
current of the ISL1539 drive amplifiers. As the supply current is
reduced, the ISL1539 will start to exhibit slightly higher levels of
distortion and the frequency response will be limited. The four
power modes of the ISL1539 are set up as shown in the table1
below.
TABLE 1. POWER MODES OF THE EL15371
C1
C0
Operation
00
IS Full Power Mode
0
1
3/4-IS Power Mode
1
0
1/2-IS Power Mode
11
Power Down
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