Austin LynxTM SMT Non-Isolated dc-dc Power Modules:
3.0 Vdc - 5.5 Vdc Input, 0.9 Vdc - 3.3 Vdc Output, 10 A
Data Sheet
March 28, 2008
Table 1. Austin Lynx™ Trim Values
Feature Descriptions
VO, set
Rbuffer
Remote On/Off
3.3 V
2.5 V
2.0 V
1.8 V
1.5 V
1.2 V
1.0 V
0.9 V
59 kΩ
78.7 kΩ
100 kΩ
100 kΩ
100 kΩ
59 kΩ
The Austin Lynx™ SMT 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 npn transistor between the On/Off pin and
the GND pin (see Figure 20).
30.1 kΩ
5.11 kΩ
During a logic-high (On/Off pin is pulled high internal to the
module) when the transistor is in the off state the power
module is on. The maximum leakage current of the transistor
when Von/off = (VI –0.4) is 10 µA. The module is Off when
the On/Off pin is pulled low (Logic-low) with the transistor in
the active state. During this state VOn/Off is less than 0.3V
and the maximum IOn/Off = 1 mA.
Note: VO, set is the typical output voltage for the unit.
For example, to trim-up the output voltage of 1.5V
module (AXH010A0M-SR) by 8% to 1.62V, Rtrim-up is cal-
culated as follows:
ΔV
= 0.12V
out
R
= 100kΩ
buffer
24080
0.12
VI
R
= -------------- – 100k
trim – up
Vo
Ion/off
ON/OFF
R
= 100.66kΩ
trim – up
+
Von/off
AAXXHH001100AA00MM-S9R-SR
GND
VO
RLOAD
TRIM
Figure 20. Remote On/Off Implementation.
Rtrim-up
Output Voltage Set-Point Adjustment (Trim)
GND
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).
Figure 21. Circuit Configuration to trim-up
output voltage.
For TRIM-UP using an external resistor, connect Rtrim-up
between the TRIM and GND pins (21). The value of Rtrim-
up defined as:
For trim-down using an external resistor, connect Rtrim-
down between the TRIM and VOUT pins of the module (22).
The value of Rtrim-down is defined as:
24080
ΔVout
Rtrim – up = ------------------ – Rbuffer
kΩ
V
– 0.8
out
⎛
⎝
⎞
|ΔVout| is the desired output voltage set-point adjustment
Rbuffer (internal to the module) is defined in Table 1 for vari-
ous models
R
=
------------------------ – 1 x30100 – R
kΩ
trim-down
buffer
⎠
ΔV
out
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 1 for vari-
ous models
For example, to trim-down the output voltage of 2.5 V mod-
ule (AXH010G-SR) by 8% to 2.3V, Rtrim-down is calculated
as follows:
Lineage Power
10
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
