Data Sheet
HC006/010 Series DC-DC Power Module:
May 16, 2008
18-36Vdc Input; 3.3V & 5Vdc Output; 6.6A - 10A Output Current
begin to operate at an input voltage above the
undervoltage lockout turn-on threshold.
Feature Description
Remote On/Off
Over Voltage Protection
Two remote on/off options are available. Positive logic
turns the module on during a logic high voltage on the
ON/OFF pin, and off during a logic low. Negative logic
remote On/Off, device code suffix “1”, turns the module
off during a logic high and on during a logic low.
The output overvoltage protection clamp consists of
control circuitry, independent of the primary regulation
loop, that monitors the voltage on the output terminals.
This control loop has a higher voltage set point than the
primary loop (See the overvoltage clamp values in the
Feature Specifications Table). In a fault condition, the
overvoltage clamp ensures that the output voltage does
not exceed Vo,ovsd, max. This provides a redundant
voltage-control that reduces the risk of output
overvoltage.
VIN(+)
VO
Ion/off
ON/OFF
Over Temperature Protection
To provide protection in a fault condition, the unit is
equipped with a thermal shutdown circuit. The unit will
shutdown if the overtemperature threshold of 125 oC is
exceeded at the thermal reference point Tref . Once the
unit goes into thermal shutdown it will then wait to cool
before attempting to restart.
Von/off
COM
VIN(-)
Output Voltage Programming
Figure 16. Remote On/Off Implementation.
Trimming allows the output voltage set point to be
increased or decreased, this is accomplished by
connecting an external resistor between the TRIM pin
and either the VO(+) pin or the VO(-) pin (COM pin) .
To turn the power module on and off, the user must
supply a switch (open collector or equivalent) to control
the voltage (Von/off) between the ON/OFF terminal and
the VIN(-) terminal. Logic low is –0.7V ≤ Von/off ≤ 1.2V.
The maximum Ion/off during a logic low is 1mA, the switch
should be maintain a logic low level whilst sinking this
current.
VIN(+)
VO(+)
VOTRIM
COM
Rtrim-up
ON/OFF
During a logic high, the maximum Von/off generated by
the module is 15V, and the maximum allowable leakage
current at Von/off = 15V is 50μA.
LOAD
Rtrim-down
If not using the remote on/off feature:
For positive logic, leave the ON/OFF pin open.
For negative logic, short the ON/OFF pin to VIN(-).
Overcurrent Protection
VIN(-)
To provide protection in a fault (output overload) condi-
tion, the module is equipped with internal current-limiting
circuitry, and can endure current limiting continuously.
At the instance of current-limit inception, the output
current begins to tail-out. When an overcurrent condition
exists beyond a few seconds, the module enters a
“hiccup” mode of operation, whereby it shuts down and
automatically attempts to restart upon cooling. While the
fault condition exists, the module will remain in this
hiccup mode, and can remain in this mode until the fault
is cleared. The unit operates normally once the output
current is reduced back into its specified range.
Figure 17. Circuit Configuration to Trim Output
Voltage.
Connecting an external resistor (Rtrim-down) between the
TRIM pin and the COM pin decreases the output voltage
set point. The following equation determines the value
of trim-down resistor needed to decrease the output
voltage from Vo,set to Vo:
Input Undervoltage Lockout
At input voltages below the input undervoltage lockout
limit, the module operation is disabled. The module will
LINEAGE POWER
9
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
