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VTM 48 E x 040 y 050A00
7.0 USING THE CONTROL SIGNALS VC, PC, TM, IM
The VTM Control (VC) pin is an input pin which powers the
internal VCC circuitry when within the specified voltage range
of 11.5 V to 16.5 V. This voltage is required for VTM TM current
multiplier start up and must be applied as long as the input is
below 26 V. In order to ensure a proper start, the slew rate of
the applied voltage must be within the specified range.
Some additional notes on the using the VC pin:
? In most applications, the VTM module will be powered by an
upstream PRM TM regulator which provides a 10 ms
VC pulse during start up. In these applications the VC pins
of the PRM regulator and VTM current multiplier should be
tied together.
? The VC voltage can be applied indefinitely allowing for
continuous operation down to 0 V IN .
? The fault response of the VTM module is latching. A positive
edge on VC is required in order to restart the unit. If VC is
continuously applied the PC pin may be toggled to restart
the VTM module.
Primary Control (PC) pin can be used to accomplish the
following functions:
? Delayed start: Upon the application of VC, the PC pin will
source a constant 100 μA current to the internal RC
network. Adding an external capacitor will allow further
delay in reaching the 2.5 V threshold for module start.
? Auxiliary voltage source: Once enabled in regular
operational conditions (no fault), each VTM PC provides a
regulated 5 V, 2 mA voltage source.
? Output disable: PC pin can be actively pulled down in order
to disable the module. Pull down impedance shall be lower
than 400 Ω .
? Fault detection flag: The PC 5 V voltage source is internally
turned off as soon as a fault is detected. It is important to
notice that PC doesn’t have current sink capability. Therefore,
in an array, PC line will not be capable of disabling
neighboring modules if a fault is detected.
? Fault reset: PC may be toggled to restart the unit if VC
is continuously applied.
Temperature Monitor (TM) pin provides a voltage
proportional to the absolute temperature of the converter
8.0 START UP BEHAVIOR
Depending on the sequencing of the VC with respect to the
input voltage, the behavior during start up will vary as follows:
? Normal operation (VC applied prior to V IN ): In this case the
controller is active prior to ramping the input. When the
input voltage is applied, the VTM output voltage will track
the input (See Figure 10). The inrush current is determined by
the input voltage rate of rise and output capacitance. If the
VC voltage is removed prior to the input reaching 26 V, the
VTM may shut down.
? Stand-alone operation (VC applied after V IN ): In this case the
VTM output will begin to rise upon the application of the
VC voltage (See Figure 11). The Adaptive Soft Start Circuit
(See Section 11) may vary the ouput rate of rise in order to
limit the inrush current to its maximum level. When starting
into high capacitance, or a short, the output current will be
limited for a maximum of 120 μ/sec. After this period, the
Adaptive Soft Start Circuit will time out and the VTM module
may shut down. No restart will be attempted until VC is
re-applied or PC is toggled. The maximum output
capacitance is limited to 9100 μF in this mode of operation
to ensure a sucessful start.
9.0 THERMAL CONSIDERATIONS
V ? I Chip TM products are multi-chip modules whose temperature
distribution varies greatly for each part number as well as
with the input / output conditions, thermal management and
environmental conditions. Maintaining the top of the
VTM48EF040T050A00 case to less than 100oC will keep all
junctions within the V ? I Chip module below 125oC for most
applications.
The percent of total heat dissipated through the top surface
versus through the J-lead is entirely dependent on the
particular mechanical and thermal environment. The heat
dissipated through the top surface is typically 60%. The heat
dissipated through the J-lead onto the PCB board surface is
typically 40%. Use 100% top surface dissipation when
designing for a conservative cooling solution.
It is not recommended to use a V ? I Chip module for an
extended period of time at full load without proper
heat sinking.
control IC.
It can be used to accomplish the following functions:
? Monitor the control IC temperature: The temperature in
Kelvin is equal to the voltage on the TM pin scaled
by 100. (i.e. 3.0 V = 300 K = 27oC). If a heat sink is applied,
TM can be used to thermally protect the system.
? Fault detection flag: The TM voltage source is internally
turned off as soon as a fault is detected. For system
monitoring purposes (microcontroller interface) faults are
detected on falling edges of TM signal.
Rev. 3.2
V?I CHIP CORP. (A VICOR COMPANY) 25 FRONTAGE RD. ANDOVER, MA 01810 800-735-6200
2/2011
Page 9 of 18
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