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LTM4606
APPLICATIONS INFORMATION
+ R FB
= 0.6V
V OUT
PLLIN
The power module has a phase-locked loop comprised of an
internal voltage controlled oscillator and a phase detector.
This allows the internal top MOSFET turn-on to be locked
to the rising edge of the external clock. The frequency range
is ±30% around the operating frequency. A pulse detection
circuit is used to detect a clock on the PLLIN pin to turn
on the phase lock loop. The pulse width of the clock has to
be at least 400ns and the amplitude at least 2V. The PLLIN
pin must be driven from a low impedance source such as
a logic gate located close to the pin. During the start-up of
the regulator, the phase-locked loop function is disabled.
INTV CC and DRV CC Connection
An internal low dropout regulator produces an internal
5V supply that powers the control circuitry and DRV CC
for driving the internal power MOSFETs. Therefore, if
the system does not have a 5V power rail, the LTM4606
can be directly powered by Vin. The gate driver current
through the LDO is about 20mA. The internal LDO power
dissipation can be calculated as:
P LDO_LOSS = 20mA ? (V IN – 5V)
The LTM4606 also provides an external gate driver voltage
pin DRV CC . If there is a 5V rail in the system, it is recom-
mended to connect DRV CC pin to the external 5V rail. This is
especially true for higher input voltages. Do not apply more
than 6V to the DRV CC pin. A 5V output can be used to power
the DRV CC pin with an external circuit as shown in Figure 18.
Parallel Operation of the Module
The LTM4606 device is an inherently current mode con-
trolled device. Parallel modules will have very good current
sharing. This will balance the thermals on the design. The
voltage feedback equation changes with the variable N as
modules are paralleled:
60.4k
N
R FB
N is the number of paralleled modules.
Thermal Considerations and Output Current Derating
In different applications, LTM4606 operates in a variety of
thermal environments. The maximum output current is
limited by the environment thermal condition. Sufficient
cooling should be provided to help ensure reliable operation.
When the cooling is limited, proper output current derating
is necessary, considering ambient temperature, airflow,
input/output condition, and the need for increased reliability.
The power loss curves in Figures 6 and 7 can be used
in coordination with the load current derating curves in
Figures 8 to 15 for calculating an approximate θ JA for the
module. The graphs delineate between no heat sink, and
a BGA heat sink. Each of the load current derating curves
will lower the maximum load current as a function of the
increased ambient temperature to keep the maximum junc-
tion temperature of the power module at 125°C maximum.
Each of the derating curves and the power loss curve that
corresponds to the correct output voltage can be used to
solve for the approximate θ JA of the condition. Each figure
has three curves that are taken at three different air flow
conditions. Tables 3 and 4 provide the approximate θ JA
for Figures 8 to 15. A complete explanation of the thermal
characteristics is provided in the thermal application note
AN110.
Safety Considerations
The LTM4606 modules do not provide galvanic isolation
from V IN to V OUT . There is no internal fuse. If required,
a slow blow fuse with a rating twice the maximum input
current needs to be provided to protect each unit from
catastrophic failure.
Radiated EMI Noise
High radiated EMI noise is a disadvantage for switching
regulators by nature. Fast switching turn-on and turn-off
make large di/dt change in the converters, which act as
the radiation sources in most systems. The LTM4606
integrates the feature to minimize the radiated EMI noise
for applications with low noise requirements. Optimized
gate driver for the MOSFET and noise cancellation network
are installed inside the LTM4606 to achieve low radiated
EMI noise. Figure 16 shows a typical example for LTM4606
to meet the Class B of EN55022 radiated emission limit.
4606fd
For more information www.linear.com/LTM4606
15
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