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MBCM270F450M270A00 - MBCM270T450M270A00
7.0 USING THE CONTROL SIGNALS PC, TM
Primary Control (PC) pin can be used to accomplish the
following functions:
? Logic enable and disable for module: Once Ton1 time has
been satisfied, a PC voltage greater than Vpc_en will cause
the module to start. Bringing PC lower than Vpc_dis will
cause the module to enter standby.
? Auxiliary voltage source: Once enabled in regular
operational conditions (no fault), each BCM module
PC provides a regulated 5 V, 3.5 mA voltage source.
? Synchronized start up: In an array of parallel modules, PC
pins should be connected to synchronize start up across
units. This permits the maximum load and capacitance
to scale by the number of paralleled modules.
? Output disable: PC pin can be actively pulled down in order
to disable the module. Pull down impedance shall be lower
than 60 Ω .
? Fault detection flag: The PC 5 V voltage source is internally
turned off as soon as a fault is detected.
? Note that PC can not sink significant current during a fault
condition. The PC pin of a faulted module will not cause
interconnected PC pins of other modules to be disabled.
Temperature Monitor (TM) pin provides a voltage
proportional to the absolute temperature of the converter
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 protect the system thermally.
? 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. 1.1
V?I CHIP CORP. (A VICOR COMPANY) 25 FRONTAGE RD. ANDOVER, MA 01810 800-735-6200
1/2011
Page 10 of 19
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