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LTM8055 数据表(PDF) 14 Page - Linear Technology

部件名 LTM8055
功能描述  36VIN, 8.5A Buck-Boost 關Module Regulator
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTM8055 数据表(HTML) 14 Page - Linear Technology

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LTM8055
14
8055fb
For more information www.linear.com/LTM8055
Input Current Monitor (IINMON)
The IINMON pin produces a voltage equal to approximately
20 times the voltage of IIN – VIN. Since the LTM8055 input
current limit engages when IIN – VIN = 50mV, IINMON will
be 1V at maximum input current.
Output Current Monitor (IOUTMON)
The IOUTMON pin produces a voltage proportional to the
voltage of VOUT – IOUT. Since the LTM8055 output current
limit engages when VOUT – IOUT = 58mV, IOUTMON will be
1.2V at maximum output current.
Synchronization
TheLTM8055switchingfrequencycanbesynchronizedto
an external clock using the SYNC pin. Driving SYNC with
a 50% duty cycle waveform is a good choice, otherwise
maintainthedutycyclebetweenabout10%and90%.When
synchronizing, a valid resistor value (that is, a value that
results in a free-running frequency of 100kHz to 800kHz)
must be connected from RT to GND.
While an RT resistor is required for proper operation, the
value of this resistor is independent of the frequency of
the externally applied SYNC signal. Be aware, however,
that the LTM8055 will switch at the frequency prescribed
by the RT value if the SYNC signal terminates, so choose
an appropriate resistor value.
CLKOUT
The CLKOUT signal reflects the internal switching clock of
theLTM8055.Itisphaseshiftedbyapproximately180°with
respect to the leading edge of the internal clock. If CLKOUT
is connected to the SYNC input of another LTM8055, the
two devices will switch about 180° out of phase.
Input Precaution
In applications where the output voltage is deliberately
pulled up above the set regulation voltage or the FB pin is
abruptlydriventoanewvoltage,theLTM8055mayattempt
to regulate the voltage by removing energy from the load
for a short period of time after the output is pulled up.
Since the LTM8055 is a synchronous switching converter,
it delivers this energy to the input. If there is nothing on the
LTM8055 input to consume this energy, the input voltage
may rise. If the input voltage rises without intervention, it
may rise above the absolute maximum rating, damaging
the part. Carefully examine the input voltage behavior to
see if the application causes it to rise.
In many cases, the system load on the LTM8055 input
bus will be sufficient to absorb the energy delivered by the
μModule regulator. The power required by other devices
will consume more than enough to make up for what
the LTM8055 delivers. In cases where the LTM8055 is
the largest or only power converter, this may not be true
and some means may need to be devised to prevent the
LTM8055’s input from rising too high. Figure 5a shows a
passive crowbar circuit that will dissipate energy during
momentaryinputovervoltageconditions.Thebreak-down
voltage of the Zener diode is chosen in conjunction with
the resistor R to set the circuit’s trip point. The trip point
is typically set well above the maximum VIN voltage under
normal operating conditions. This circuit does not have
a precision threshold, and is subject to both part-to-part
and temperature variations, so it is most suitable for ap-
plications where the maximum input voltage is much less
than the 40VIN absolute maximum. As stated earlier, this
type of circuit is best suited for momentary overvoltages.
Figure 5a is a crowbar circuit, which attempts to prevent
the input voltage from rising above some level by dumping
energy to GND through a power device. In some cases,
it is possible to simply turn off the LTM8055 when the
input voltage exceeds some threshold. An example of this
circuit is shown in Figure 5b. When the power source on
the output drives VIN above a predetermined threshold,
the comparator pulls down on the RUN pin and stops
switching in the LTM8055. When this happens, the input
capacitance needs to absorb the energy stored within the
LTM8055’s internal inductor, resulting in an additional
voltage rise. This voltage rise depends upon the input
capacitor size and how much current is flowing from the
LTM8055 output to input.
APPLICATIONS INFORMATION


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