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LTM4633 Scheda tecnica(PDF) 21 Page - Linear Technology

Il numero della parte LTM4633
Spiegazioni elettronici  Triple 10A Step-DownDC/DC 關Module Regulator
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Produttore elettronici  LINER [Linear Technology]
Homepage  http://www.linear.com
Logo LINER - Linear Technology

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LTM4633
21
4633f
For more information www.linear.com/LTM4633
applicaTions inForMaTion
If we take this equation an differentiate it with respect
temperature T, then:
dVD
dt
= –
VGO – VD
T
This dVD/dT change as a function of temperature is the
typical ~–2.0mV/°C. This equation is simplified for the
first order derivation.
Solving for T, T = –(VG0–VD)/dVDprovidethetemperature.
1st Example: Figure 4 for 27°C, or 300°C Kelvin the diode
voltage is 0.598V, thus, 300°C = –(1200mV – 598mV)/
–2.0 mV/°C)
2nd Example: Figure 4 for 75°C, or 350°C Kelvin the diode
voltage is 0.50V, thus, 350°C = –(1200mV – 500mV)/
–2.0mV/°C)
Converting the Kelvin scale to Celsius is simply taking the
Kelvin temp and subtracting –273°C Kelvin from it.
A typical forward voltage is measured and placed in the
electrical characteristics section of the data sheet, and
Figure 4 is the plot of this forward voltage. Measure this
forward voltage at 27°C to establish a reference point.
Then use the above expression while measuring the
forward voltage over temperature will provide a general
temperature monitor.
The diode connected PNP transistor at the TEMP pins can
beusedtomonitortheinternaltemperatureoftheLTM4633.
A general temperature monitor can be implemented by
connecting a resistor between TEMP and VIN to set the
current to 100µA, and then monitoring the diode voltage
drop with temperature. See Figure 19 for an example.
Safety Considerations
The LTM4633 module does not provide galvanic isolation
from VIN to any of the three VOUTs. There is no internal
fuse. If required, a slow blow fuse with a rating higher
than the maximum input current can be used to protect
the unit in case of a catastrophic failure. An inline circuit
breaker function can also be used instead of a fuse.
The fuse or circuit breaker should be selected to limit the
current to the regulator during overvoltage in case of an
internal top MOSFET fault. If the internal top MOSFET fails,
then turning it off will not resolve the overvoltage, thus
the internal bottom MOSFET will turn on indefinitely trying
to protect the load. Under this fault condition, the input
voltage will source very large currents to ground through
the failed internal top MOSFET and enabled internal bot-
tom MOSFET. This can cause excessive heat and board
damage depending on how much power the input voltage
can deliver to this system. A fuse or circuit breaker can
be used as a secondary fault protector in this situation.
Layout Checklist/Example
The high integration of LTM4633 makes the PCB board
layoutverysimpleandeasy.However,tooptimizeitselectri-
cal and thermal performance, some layout considerations
are still necessary.
Use large PCB copper areas for high current paths, in-
cluding VIN, GND, VOUT1, VOUT2, and VOUT3. It helps to
minimize the PCB conduction loss and thermal stress.
Place high frequency ceramic input and output capacitors
next to the VIN, GND and the VOUT pins to minimize high
frequency noise.
Place a dedicated power ground layer underneath the unit.
To minimize the via conduction loss and reduce module
thermal stress, use multiple vias for interconnection be-
tween top layer and other power layers.
Donotputviasdirectlyonthepads,unlesstheyarecapped
or plated over. Use a separated SGND ground copper area
for components connected to signal pins. Connect the
SGND to GND underneath the unit. Bring out test points
on the signal pins for monitoring. Figure 6 gives a good
example of the recommended layout.


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