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LTM8050 Datenblatt(PDF) 15 Page - Linear Technology

Teilenummer LTM8050
Bauteilbeschribung  58V, 2A Step-Down 關Module Regulator
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Hersteller  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTM8050 Datenblatt(HTML) 15 Page - Linear Technology

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LTM8050
15
8050fc
For more information www.linear.com/LTM8050
APPLICATIONS INFORMATION
Figure 1. Apply an RC Network to RUN/SS to Control the
Soft-Start Behavior of the LTM8050 at Power-Up
Minimum Input Voltage
The LTM8050 is a step-down converter, so a minimum
amount of headroom is required to keep the output in
regulation. In addition, the input voltage required to turn
on is higher than that required to run, and depends upon
whether the RUN/SS is used. As shown in the Typical
Performance Characteristics section, the minimum input
voltage to run a 3.3V output at light load is only about 3.6V,
but, if RUN/SS is pulled up to VIN, it takes 5.5VIN to start.
If the LTM8050 is enabled with the RUN/SS pin after VIN
is applied, the minimum voltage to start at light loads is
lower, about 4.3V. Similar curves detailing this behavior
of the LTM8050 for other outputs are also included in the
Typical Performance Characteristics section.
Soft-Start
The RUN/SS pin can be used to soft-start the LTM8050,
reducing the maximum input current during start-up. The
RUN/SS pin is driven through an external RC network to
create a voltage ramp at this pin. (See Figure 1). By choos-
ing an appropriate RC time constant, the peak start-up
current can be reduced to the current that is required to
regulate the output, with no overshoot. Choose the value
of the resistor so that it can supply at least 20μA when
the RUN/SS pin reaches 2.5V. Output voltage soft-start
waveforms for various values of RSS and CSS are given in
the Typical Performance Characteristics section.
RUN/SS
RUN
RUN
100k
CSS
Thisinturnlimitstheamountofenergythatcanbedelivered
to the load under fault. During the start-up time, frequency
foldback is also active to limit the energy delivered to the
potentially large output capacitance of the load.
Synchronization
TheinternaloscillatoroftheLTM8050canbesynchronized
by applying an external 250kHz to 2MHz clock to the SYNC
pin. Do not leave this pin floating. When synchronizing
the LTM8050, select an RTresistorvaluethatcorresponds
to an operating frequency 20% lower than the intended
synchronization frequency (see the Frequency Selection
section).
Inadditiontosynchronization,theSYNCpincontrolsBurst
Mode behavior. If the SYNC pin is driven by an external
clock, or pulled up above 0.7V, the LTM8050 will not
enter Burst Mode operation, but will instead skip pulses
to maintain regulation instead.
Shorted Input Protection
Care needs to be taken in systems where the output will
be held high when the input to the LTM8050 is absent.
This may occur in battery charging applications or in
battery backup systems where a battery or some other
supply is diode ORed with the LTM8050’s output. If the
VIN pin is allowed to float and the SHDN pin is held high
(either by a logic signal or because it is tied to VIN), then
the LTM8050’s internal circuitry will pull its quiescent
current through its internal power switch. This is fine if
your system can tolerate a few milliamps in this state. If
you ground the RUN/SS pin, the input current will drop
to essentially zero. However, if the VIN pin is grounded
while the output is held high, then parasitic diodes inside
the LTM8050 can pull large currents from the output
through the VIN pin. Figure 2 shows a circuit that will run
only when the input voltage is present and that protects
against a shorted or reversed input.
PCB Layout
Most of the headaches associated with PCB layout have
been alleviated or even eliminated by the high level of
integration of the LTM8050. The LTM8050 is neverthe-
less a switching power supply, and care must be taken to
Frequency Foldback
The LTM8050 is equipped with frequency foldback which
actstoreducethethermalandenergystressontheinternal
power elements during a short circuit or output overload
condition.IftheLTM8050detectsthattheoutputhasfallen
out of regulation, the switching frequency is reduced as a
function of how far the output is below the target voltage.


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