Data Sheet
May 16, 2008
HC006/010 Series DC-DC Power Module:
18-36Vdc Input; 3.3V & 5Vdc Output; 6.6A - 10A Output Current
Feature Description
Remote On/Off
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.
begin to operate at an input voltage above the
undervoltage lockout turn-on threshold.
Over Voltage Protection
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.
V
IN
(+)
I
on/off
ON/OFF
V
O
Over Temperature Protection
COM
V
on/off
V
IN
(-)
To provide protection in a fault condition, the unit is
equipped with a thermal shutdown circuit. The unit will
o
shutdown if the overtemperature threshold of 125 C is
exceeded at the thermal reference point T
ref
. Once the
unit goes into thermal shutdown it will then wait to cool
before attempting to restart.
Output Voltage Programming
Figure 16. Remote On/Off Implementation.
To turn the power module on and off, the user must
supply a switch (open collector or equivalent) to control
the voltage (V
on/off
) between the ON/OFF terminal and
the V
IN
(-) terminal. Logic low is –0.7V
≤
V
on/off
≤
1.2V.
The maximum I
on/off
during a logic low is 1mA, the switch
should be maintain a logic low level whilst sinking this
current.
During a logic high, the maximum V
on/off
generated by
the module is 15V, and the maximum allowable leakage
current at V
on/off
= 15V is 50μA.
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 V
IN
(-).
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 V
O
(+) pin or the V
O
(-) pin (COM pin) .
V
IN
(+)
V
O
(+)
R
trim-up
ON/OFF
V
O
TRIM
R
trim-down
V
IN
(-)
COM
LOAD
Overcurrent Protection
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 (R
trim-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 V
o,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 ]
