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MC34652EF Fiches technique(PDF) 10 Page - Freescale Semiconductor, Inc

No de pièce MC34652EF
Description  2.0 A Negative Voltage Hot Swap Controller with Enhanced Programmability
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Fabricant  FREESCALE [Freescale Semiconductor, Inc]
Site Internet  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC34652EF Fiches technique(HTML) 10 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
10
Freescale Semiconductor
34652
FUNCTIONAL DESCRIPTION
FUNCTIONAL TERMINAL DESCRIPTION
POWER GOOD OUTPUT (ACTIVE LOW) (PG)
The PG terminal is the active low power good output signal
that is used to enable or disable a load. This signal goes
active after a successful power-up sequence and stays active
as long as the device is in normal operation and is not
experiencing any faults.
The signal is deactivated under the following conditions:
• Power is turned off.
• The device is disabled for more than 1.0 ms.
• The device exceeded its thermal shutdown threshold for
more than 12
µs.
• The device is in overvoltage or undervoltage mode for
more than 1.0 ms.
• Load current exceeded the overcurrent limit for more than
3.0 ms.
This terminal is referenced to VIN.
OUTPUT VOLTAGE (VOUT)
The VOUT terminal is the drain of the internal Power
MOSFET and supplies a current-limited voltage to the load.
The load connects between the VOUT and VPWR terminals.
START-UP AND RETRY DELAY TIMER (TIMER)
This input is used to control the time-base used to
generate the timing sequences at start-up and the retry delay
when the device experiences any fault. The TIMER terminal
can be left unconnected for a default timer value of 200 ms or
the user can connect a resistor between this terminal and the
VIN terminal to set the timer value externally. The timer value
can vary between 100 ms and 1000 ms.
OVERVOLTAGE CONTROL (OV)
The OV terminal is used to set the upper limit of the input
voltage operation range. If the OV terminal voltage goes
above the overvoltage threshold value, the device turns off
the internal Power MOSFET and deactivates the two power
good outputs, PG and PG. The Power MOSFET stays off until
the OV drops below the threshold value. The overvoltage
detection circuit has a 1.0 ms filter timer.
The OV terminal can be left unconnected for the typical
default threshold value of 78 V or the user can set the
threshold value externally with a simple voltage divider using
resistors between the VPWR and VIN terminals.
UNDERVOLTAGE CONTROL (UV)
The UV terminal is used to set the lower limit of the input
voltage operation range. If the UV terminal voltage goes
below the undervoltage threshold value, the device turns off
the internal Power MOSFET and deactivates the two power
good outputs, PG and PG. The Power MOSFET stays off until
the UV rises above the threshold value. The undervoltage
detection circuit has a 1.0 ms filter timer.
The UV terminal can be left unconnected for the typical
default threshold value of 37 V or the user can set the
threshold value externally with a simple voltage divider using
resistors between the VPWR and VIN terminals.
POSITIVE SUPPLY VOLTAGE INPUT (VPWR)
The VPWR terminal is the most-positive power supply
input. The load connects between the VPWR and VOUT
terminals.
DISABLE INPUT CONTROL (DISABLE)
The DISABLE terminal is used to easily disconnect or
connect the load from the main power line by disabling or
enabling the 34652. It can also be used to reset the fault
conditions that cause a “Power No Good” signal.
If left open or connected to VPWR, the DISABLE terminal
is inactive and the device is enabled. If a positive voltage
(above VPWR) or a negative voltage (below VPWR) is applied
to DISABLE, it is active and the device is disabled. The
disable function has a 1.0 ms filter timer.
This terminal is referenced to VPWR.
CURRENT LIMIT CONTROL (ILIM)
The ILIM terminal is used to set the overcurrent limit during
normal operation. This terminal can be left unconnected for a
default overcurrent limit value of 1.0 A or the user can
connect an external resistor between the ILIM and VIN
terminals to set the overcurrent limit value. This value can
vary between 0.15 A and 2.25 A. The overcurrent detection
circuit has a 100
µs filter timer.
CHARGING CURRENT LIMIT CONTROL (ICHG)
The ICHG terminal is used to set the current limit that is
used to charge the load’s input capacitor, hence limiting the
inrush current to a known constant value. This terminal can
be left unconnected for a default charging current limit value
of 0.1 A and a default ICHG rise time of 1.0 ms. Or the user
can connect an external resistor between the ICHG and VIN
terminals to set the current limit value between 0.05 A and
0.5 A and an external capacitor to increase the ICHG rise time.
The recommended maximum rise time is 10 ms.


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