APXH006A0X-SRZ Datasheet, PDF (13/23 Pages) Lineage Power Corporation – 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 6A output current

Data Sheet
May 20, 2009
Pico TLynx^TM 6A: Non-isolated DC-DC Power Modules
2.4 – 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 6A output current
Feature Descriptions
Remote On/Off
The Pico TLynx^TM 6A modules feature an On/Off pin for
remote On/Off operation. Two On/Off logic options are
available. In the Positive Logic On/Off option, (device
code suffix “4” see Ordering Information), the module
turns ON during a logic High on the On/Off pin and turns
OFF during a logic Low. With the Negative Logic On/Off
option, (no device code suffix see Ordering Information),
the module turns OFF during logic High and ON during
logic Low. The On/Off signal is always referenced to
ground. For either On/Off logic option, leaving the
On/Off pin disconnected will turn the module ON when
input voltage is present.
For positive logic modules, the circuit configuration for
using the On/Off pin is shown in Figure 38. When the
external transistor Q1 is in the OFF state, Q2 is ON, the
internal PWM Enable signal is pulled low and the
module is ON. When transistor Q1 is turned ON, the
On/Off pin is pulled low, Q2 is turned off and the internal
PWM Enable signal is pulled high through the 100K
internal pull-up resistor and the module is OFF.
VIN+
MODULE
I _ON/OFF
ON/OFF ₊
Q1
GND
V_ON/OFF
_
20K
20K
100K
PWM Enable
Q2
Figure 38. Circuit configuration for using positive
On/Off logic.
For negative logic On/Off modules, the circuit
configuration is shown in Fig. 39. The On/Off pin should
be pulled high with an external pull-up resistor
(suggested value for the 2.4V to 5.5Vin range is
3.6Kohms). When transistor Q1 is in the OFF state, the
On/Off pin is pulled high and the module is OFF. The
On/Off threshold for logic High on the On/Off pin
depends on the input voltage and its minimum value is
VIN – 1.6V. To turn the module ON, Q1 is turned ON
pulling the On/Off pin low.
VIN+
MODULE
Rpullup
100K
ON/OFF
I _ON/OFF
+
V_ON/OFF
Q1
2.05K PWM Enable
20K
GND
_
Figure 39. Circuit configuration for using negative
On/Off logic.
Over Current Protection
To provide protection in a fault (output overload)
condition, the unit is equipped with internal
current-limiting circuitry and can endure current limiting
continuously. At the point of current-limit inception, the
unit enters hiccup mode. The unit operates normally
once the output current is brought back into its specified
range.
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 140^oC is
exceeded at the thermal reference point Tref . The
thermal shutdown is not intended as a guarantee that
the unit will survive temperatures beyond its rating.
Once the unit goes into thermal shutdown it will then
wait to cool before attempting to restart.
Input Undervoltage Lockout
At input voltages below the input undervoltage lockout
limit, the module operation is disabled. The module will
begin to operate at an input voltage above the
undervoltage lockout turn-on threshold.
Output Voltage Programming
The output voltage of the Pico TLynx^TM 6A module can
be programmed to any voltage from 0.6Vdc to 3.63Vdc
by connecting a resistor between the Trim and GND
pins of the module. Certain restrictions apply on the
output voltage set point depending on the input voltage.
These are shown in the Output Voltage vs. Input
Voltage Set Point Area plot in Fig. 40. The Upper Limit
curve shows that the entire output voltage range is
available with the maximum input voltage of 5.5V. The
Lower Limit curve shows that for output voltages of 1.8V
and higher, the input voltage needs to be larger than the
minimum of 2.4V.
LINEAGE POWER
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