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LTM8065 Folha de dados(PDF) 16 Page - Linear Technology

Nome de Peças LTM8065
Descrição Electrónicos  40VIN, 2.5A Silent Switcher 關Module Regulator
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Fabricante Electrônico  LINER [Linear Technology]
Página de início  http://www.linear.com
Logo LINER - Linear Technology

LTM8065 Folha de dados(HTML) 16 Page - Linear Technology

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LTM8065
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For more information www.linear.com/LTM8065
APPLICATIONS INFORMATION
mum voltage at the BIAS pin is less than 19V. If BIAS power
is applied from a remote or noisy voltage source, it may be
necessary to apply a decoupling capacitor locally to the pin.
A 1µF ceramic capacitor works well. The BIAS pin may also
be left open at the cost of a small degradation in efficiency.
Maximum Load
ThemaximumpracticalcontinuousloadthattheLTM8065
can drive, while rated at 2.5A, actually depends upon both
the internal current limit and the internal temperature.
The internal current limit is designed to prevent damage
to the LTM8065 in the case of overload or short-circuit.
The internal temperature of the LTM8065 depends upon
operating conditions such as the ambient temperature,
the power delivered, and the heat sinking capability of
the system. For example, if the LTM8065 is configured
to regulate at 1.2V, it may continuously deliver 3.5A from
12VIN if the ambient temperature is controlled to less than
55°C. This is quite a bit higher than the 2.5A continuous
rating. Please see the “Derating, VOUT = 1.2V” curve in
theTypicalPerformanceCharacteristicssection.Similarly,
if the output voltage is 18V and the ambient temperature
is 100°C, the LTM8065 will deliver at most 0.15A from
36VIN, which is less than the 2.5A continuous rating.
Load Sharing
The LTM8065 is not designed to load share.
Burst Mode Operation
To enhance efficiency at light loads, the LTM8065 auto-
matically switches to Burst Mode operation which keeps
the output capacitor charged to the proper voltage while
minimizing the input quiescent current. During Burst
Mode operation, the LTM8065 delivers single cycle bursts
ofcurrenttotheoutputcapacitorfollowedbysleepperiods
where most of the internal circuitry is powered off and
energy is delivered to the load by the output capacitor.
During the sleep time, VIN and BIAS quiescent currents
are greatly reduced, so, as the load current decreases
towards a no load condition, the percentage of time that
the LTM8065 operates in sleep mode increases and the
average input current is greatly reduced, resulting in
higher light load efficiency.
Burst Mode operation is enabled by tying SYNC to GND.
Minimum Input Voltage
The LTM8065 is a step-down converter, so a minimum
amount of headroom is required to keep the output in
regulation. Keep the input above 3.4V to ensure proper
operation. Voltage transients or ripple valleys that cause
the input to fall below 3.4V may turn off the LTM8065.
Output Voltage Tracking and Soft-Start
The LTM8065 allows the user to adjust its output voltage
ramp rate by means of the TR/SS pin. An internal 2μA pulls
up the TR/SS pin to about 2.4V. Putting an external capaci-
tor on TR/SS enables soft starting the output to reduce
current surges on the input supply. During the soft-start
ramp the output voltage will proportionally track the TR/
SS pin voltage. For output tracking applications, TR/SS
can be externally driven by another voltage source. From
0V to 0.97V, the TR/SS voltage will override the internal
0.97V reference input to the error amplifier, thus regulat-
ing the FB pin voltage to that of the TR/SS pin. When TR/
SS is above 0.97V, tracking is disabled and the feedback
voltage will regulate to the internal reference voltage. The
TR/SS pin may be left floating if the function is not needed.
An active pull-down circuit is connected to the TR/SS pin
which will discharge the external soft-start capacitor in
the case of fault conditions and restart the ramp when the
faults are cleared. Fault conditions that clear the soft-start
capacitor are the RUN pin transitioning low, VIN voltage
falling too low, or thermal shutdown.
Pre-Biased Output
As discussed in the Output Voltage Tracking and Soft-
Start section, the LTM8065 regulates the output to the
FB voltage determined by the TR/SS pin whenever TR/
SS is less than 0.97V. If the LTM8065 output is higher
than the target output voltage, the LTM8065 will attempt
to regulate the output to the target voltage by returning a
small amount of energy back to the input supply. If there
is nothing loading the input supply, its voltage may rise.
Take care that it does not rise so high that the input voltage
exceeds the absolute maximum rating of the LTM8065.


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