Data Sheet
March 28, 2008
Feature Descriptions
Remote On/Off
Austin Lynx
TM
SIP Non-Isolated dc-dc Power Modules:
3.0 Vdc - 5.5 Vdc Input, 0.9 Vdc - 3.3 Vdc Output, 10 A
Table 1. Austin Lynx™ Trim Values
VO,
set
3.3 V
2.5 V
2.0 V
1.8 V
1.5 V
1.2 V
1.0 V
0.9 V
Rbuffer
59 kW
78.7 kW
100 kW
100 kW
100 kW
59 kW
30.1 kW
5.11 kW
The Austin Lynx™ SIP power modules feature an
On/Off pin for remote On/Off operation. If not using the
remote On/Off pin, leave the pin open (module will be On).
The On/Off pin signal (Von/off) is referenced to ground. To
switch the module on and off using remote On/Off, connect
an open collector pnp transistor between the On/Off pin and
the VI pin (see Figure 20).
During a logic-low when the transistor is in the Off state, the
power module is On and the maximum
Von/off generated by the module is 0.3V. The maximum
leakage current of the switch when Von/off = 0.3V and VI =
5.5V (Vswitch = 5.2V) is 10 µA. During a logic-high when the
transistor is in the active state, the power module is Off. Dur-
ing this state, Von/off = 2.5V to 5.5V and the maximum Ion/
off = 1mA.
Note: V
O, set
is the typical output voltage for the unit.
For example, to trim-up the output voltage of 1.5V
module (AXH010A0M) by 8% to 1.62V, Rtrim-up is
calculated as follows:
ΔV
out
= 0.12V
R
buffer
= 100kΩ
24080
R
trim
–
up
=
--------------
– 100k
-
0.12
V
I
I
on/off
V
switch
ON/OFF
Vo
R
trim
–
up
= 100.66kΩ
AXH010A0M
+
V
on/off
GND
V
O
R
LOAD
TRIM
R
trim-up
GND
Figure 20. Remote On/Off Implementation.
Output Voltage Set-Point Adjustment
(Trim)
Output voltage set-point adjustment allows the output volt-
age set point to be increased or decreased by connecting
either an external resistor or a voltage source between the
TRIM pin and either the VO pin (decrease output voltage) or
GND pin (increase output voltage).
For TRIM-UP using an external resistor, connect Rtrim-up
between the TRIM and GND pins (Figure 21). The value of
Rtrim-up defined as:
24080
R
trim
–
up
=
-----------------
–
R
buffer
-
ΔV
out
Figure 21. Circuit Configuration to trim-up output
voltage.
For trim-down using an external resistor, connect Rtrim-
down between the TRIM and VOUT pins of the module
(Figure 22). The value of Rtrim-down is defined as:
V
out
– 0.8
R
trim-down
=
⎛
------------------------
– 1
⎞
x30100
–
R
buffer
⎝ ΔV
out
-
⎠
kΩ
kΩ
Vout is the typical set point voltage of a module
|DVout| is the desired output voltage adjustment
Rbuffer (internal to the module) is defined in Table 3 for vari-
ous models
For example, to trim-down the output voltage of 2.5 V mod-
ule (AXH010G) by 8% to 2.3V, Rtrim-down is
calculated as follows:
|DVout| is the desired output voltage set-point adjustment
Rbuffer (internal to the module) is defined in Table 1 for vari-
ous models.
ΔV
out
= 0.2V
V
out
= 2.5V
Lineage Power
10
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
