LT6301IFE#TR Linear Technology, LT6301IFE#TR Datasheet - Page 10

• Manufacturer Part Number: LT6301IFE#TR
• Description: IC XDSL LINE DRIVER DUAL 28TSSOP
• Manufacturer: Linear Technology
• Type: Driverr

Specifications of LT6301IFE#TR

• Number Of Drivers/receivers: 2/0
• Protocol: xDSL
• Voltage - Supply: 5 V ~ 12 V
• Mounting Type: Surface Mount
• Package / Case: 28-TSSOP Exposed Pad, 28-eTSSOP, 28-HTSSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: LT6301IFETR

APPLICATIO S I FOR ATIO
LT6301
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 100mW
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:
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:
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
10
P
P
P
D
D
DQ
= P
= (V
= [24V • 10mA] • 4 = 960mW
I
LOAD
QUIESCENT
+
– V
+ (V
–
) • I
–
U
+ P
Q
– V
+ (V
Q(UPPER)
OUTBRMS
U
+
RMS
25
20
15
10
5
0
–240
– V
OUTARMS
of power on to the 100
+ P
) • I
–200
W
Q(LOWER)
LOAD
–160
) •
–120
I
LOAD
U
–80
Figure 7. I
(mA) (ONE DIFFERENTIAL DRIVER)
–40
0
Q
vs I
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:
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:
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:
*Design techniques exist to significantly reduce this value (See Line Driving Back Termination).
JA
40
LOAD
P
P
T
J
D(FULL)
D(FULL)
is the thermal resistance from the junction of the
JA MAX
= T
(
80
AMBIENT
)
=
= [192mW + 570mW + 570mW] • 2
= 2.664W*
120
[
+ [|–12V – (– 2V
24V • 8mA + (12V – 2V
150
160
( C) + P
2 664
.
C
200
–
50
W
6301 F07
D(FULL)
240
C
RMS
37 5
(W) •
)|] • 57mA
.
C W
RMS
/
JA
) • 57mA
( C/W)
RMS
]
sn6301 6301f
• 2
RMS