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參數(shù)資料
| 型號(hào)： | LT6301IFE#TRPBF |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 2/16頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC XDSL LINE DRIVER DUAL 28TSSOP |
| 標(biāo)準(zhǔn)包裝： | 2,000 |
| 類(lèi)型： | 驅(qū)動(dòng)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 2/0 |
| 規(guī)程： | xDSL |
| 電源電壓： | 5 V ~ 12 V |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 28-SOIC（0.173"，4.40mm 寬）裸露焊盤(pán) |
| 供應(yīng)商設(shè)備封裝： | 28-TSSOP 裸露焊盤(pán) |
| 包裝： | 帶卷 (TR) |
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10
LT6301
sn6301 6301f
which looks very much like noise, it is easiest to use the
RMS values of voltages and currents for estimating the
driver power dissipation. The voltage and current levels
shown for this example are for a full-rate ADSL signal
driving 20dBm or 100mWRMS of power on to the 100
telephone line and assuming a 0.5dBm insertion loss in
the transformer. The quiescent current for the LT6301 is
set to 10mA per amplifier.
The power dissipated in the LT6301 is a combination of the
quiescent power and the output stage power when driving
a signal. The two pairs of amplifiers are configured to place
a differential signal on two lines. The Class AB output stage
in each amplifier will simultaneously dissipate power in
the upper power transistor of one amplifier, while sourc-
ing current, and the lower power transistor of the other
amplifier, while sinking current. The total device power
dissipation is then:
PD = PQUIESCENT + PQ(UPPER) + PQ(LOWER)
PD = (V+ – V–) IQ + (V+ – VOUTARMS)
ILOAD + (V – – VOUTBRMS) ILOAD
With no signal being placed on the line and the amplifier
biased for 10mA per amplifier supply current, the quies-
cent driver power dissipation is:
PDQ = [24V 10mA] 4 = 960mW
This can be reduced in many applications by operating
with a lower quiescent current value or shutting down the
part during idle conditions.
When driving a load, a large percentage of the amplifier
quiescent current is diverted to the output stage and
becomes part of the load current. Figure 7 illustrates the
total amount of biasing current flowing between the + and
– power supplies through the amplifiers as a function of
load current for one differential driver. As much as 60% of
the quiescent no load operating current is diverted to the
load.
At full power to both lines the total package power dissi-
pation is:
PD(FULL) = [24V 8mA + (12V – 2VRMS) 57mARMS
+ [|–12V – (– 2VRMS)|] 57mARMS] 2
PD(FULL) = [192mW + 570mW + 570mW] 2
= 2.664W*
The junction temperature of the driver must be kept less
than the thermal shutdown temperature when processing
a signal. The junction temperature is determined from the
following expression:
TJ = TAMBIENT (°C) + PD(FULL) (W) θJA (°C/W)
θJA is the thermal resistance from the junction of the
LT6301 to the ambient air, which can be minimized by
heat-spreading PCB metal and airflow through the enclo-
sure as required. For the example given, assuming a
maximum ambient temperature of 50
°C and keeping the
junction temperature of the LT6301 to 150
°C maximum,
the maximum thermal resistance from junction to ambient
required is:
θJA MAX
CC
W
CW
()
–
.
./
=
°° =°
150
50
2 664
37 5
APPLICATIO S I FOR ATIO
WU
UU
Figure 7. IQ vs ILOAD
ILOAD (mA) (ONE DIFFERENTIAL DRIVER)
–240
–200
–160
–120
–80
–40
0
40
80
120
160
200
240
TOTAL
I
Q
(mA)
10
15
20
6301 F07
5
0
25
*Design techniques exist to significantly reduce this value (See Line Driving Back Termination).
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