Lambda Vega Series Instructions for use

Applications Manual
Vega Series
Power Supply
3055 Del Sol Blvd.
San Diego, CA 92154
Phone: [phone]
Fax: [phone]
Rev: A3
Date: October 2003

Vega Customer Applications Manual
Rev. A3: October 2003 Page 2 of 48
Table of Contents
Table of Contents...............................................................................................................................................................................2
Section 1 - Connection .......................................................................................................................................................................3
Section 2 - Analogue Primary Options.............................................................................................................................................8
Section 3 - Analogue Secondary options.........................................................................................................................................11
Section 4 - Output Ripple and Noise...............................................................................................................................................18
Section 5 - Fans and Cooling...........................................................................................................................................................20
Section 6 - Vega Outline Drawings.................................................................................................................................................21
Section 7 - MTBF to MIL217F........................................................................................................................................................27
Section 8 - EMC Installation notes .................................................................................................................................................28
Section 9 - Functional Notes............................................................................................................................................................29
Section 10 - Combining Modules ....................................................................................................................................................32
Section 11 - Wide Range Programmable Modules........................................................................................................................44

Vega Customer Applications Manual Section 1 - Connection
Rev. A3: October 2003 Page 3 of 48
Section 1 - Connection
Connecting Vega to the input supply.
The AC input connection is situated adjacent to the cooling fan inlet as shown above. The faston tabs are tin plated
6.3 x 0.8mm at 9mm centres. Connection is made using insulated 6.35mm 'faston' connectors rated at 15amps each.
Wire Size (awg) AMP termination Colour
22-18 2-520407-2 RED
16-14 3-520408-2 BLUE
A moulded connector housing is also available which accepts 3 low insertion force 'faston' connectors (fastons are
AMP 42100-2). The housing incorporates two locking tabs and a tywrap may be used for additional strain relief of the
AC cable. Kits of 25pcs including the moulded housing and faston connectors and ty-wraps are available, Lambda
part number = KT-AC-88537.

Vega Customer Applications Manual Section 1 - Connection
Rev. A3: October 2003 Page 4 of 48
There is also available a screw terminal input version of Vega. This has a perspex safety cover and access to fit the
screw terminals to the input is via 3 holes in the lid.
Vega imposes no special requirements for mains installation over and above standard good practise in using
switchmode power supplies:
1) Use either twisted cable of about 1 twist per centimetre or standard sheathed mains cable. Efficiency of a Vega
power supply is typically 75% (depends on the configuration). Efficiency is slightly worse with many low voltage / high
current outputs and slightly better with high voltage outputs. Input power will be 1 / (efficiency) times greater than the
specified output power. Use 75% as an estimate and consult technical sales for more accurate efficiency estimate if it
is vital.
2) Avoid running the input mains cable near to the DC output cables. This is likely to cause noise pickup which result
either in generally high levels of noise on the system power rails or worse, random system errors which can be very
hard to trace and solve and poor RFI performance.
3) Pay special attention to the design of the system earth to prevent earth loops. The system earth should be
connected via a "star" network with all earth connections joining at the system earth starpoint at the input filter.
4) Vega power supplies are designed to meet EN55022 conducted RFI emissions. However, this may not remove the
requirement for an RFI filter at the system inlet due to noise picked up from looming as part of the system installation.
Cable runs within the system can pick up noise which can degrade the overall RFI performance. Also, when
connecting power supplies in parallel, each power supply will contribute it's own noise to the total emitted RFI.
Connecting Vega to the Load
The picture shows a typical Vega configuration
with faston output connections :-
Slot 5 = blank slot.
Slot 4 = Single slot, Twin module (2outputs)
Slot 3&2 = Dual slot module (1 output)
Slot 1 = Single slot module (1 output)
5
4
3
2
1

Vega Customer Applications Manual Section 1 - Connection
Rev. A3: October 2003 Page 5 of 48
Output Voltages are delivered factory set according to customer requirement. Adjustment can be made via multi-turn
potentiometers at the front of each module. CLOCKWISE = INCREASE VOLTAGE.
Refer to the handbook for module adjustment range when adjusting output voltages and ensure that maximum power
and maximum ampere turns are not exceeded.
Modules are available with SCREW TERMINALS or FASTON TERMINALS specified at purchase.
Suggested faston Terminals & Current handling capacities of Copper Multi Stranded TRI-Rated cable.
Cross sectional Cable Gauge Typical Rated Suggested FASTON Terminal
Area (sq mm) AWG Current
(Amps)
0.5 22 11
0.75 20 14 AMP faston 2-520407-2 (red)
1.0 18 17
1.5 16 21 AMP faston 3-520408-2 (blue)
2.5 14 30
412 41 AMP faston 280223-2
610 53 USE AMP ringtag 130191 and specify screw
terminals
10 875 USE AMP ringtag 130552 and specify screw
terminals
16 6100
Suggested sources for RING TAGS for use with SCREW TERMINATIONS.
Up to 50 Amps = AMP PIDG ringtags.
RED BLUE YELLOW
M3 36151 320561 ---------
M4 320551 320560 320568
M5 130660 130663 130167
Crimp tool = 169400, Die set 169404
Over 50 Amps = AMP AMPOWER III ringtags.
TAGS
M5 - 6AWG 719551-1
M5 - 8AWG 719538-2
Terminals with crimp tool = 708777-4
General Installation.
All switch mode power supplies can be sensitive to stray inductance in the power leads and specifically in remote
sense leads if installed poorly. Poor transient response or high noise pickup and also intermittent tripping of
Overvoltage protection are possible problems. Observing a few simple installation rules will ensure trouble free
function :-

Vega Customer Applications Manual Section 1 - Connection
Rev. A3: October 2003 Page 6 of 48
When connecting Vega by means of a cable harness, run the remote sense and power output cables as separate pairs
twisted tightly together with at least 1 twist per centimetre. Keep cable runs as short as possible.
When connecting Vega to the load by means of a PCB backplane, run the power tracks "back to back" on the PCB to
minimise the projected area of the loop connecting the positive and negative outputs. Run the remote sense and
power connections as separate pairs, avoiding close parallel runs and only coming together at the load.
The load should be de-coupled with 10uF of capacitance per Amp of load current. The greater the amount of de-
coupling, the better the transient response of the system will be. (NB Max recommended de-coupling is 1000uF/Amp).
Remote Sense.
All single output Vega modules are provided with remote sense connector as standard. Twin output Vega modules are
available with remote sense but need to be ordered with a secondary option “R” specified. In both cases the Molex
connector viewed from the back of the power supply is :-
Remote sense can be used to compensate for the drop in voltage along the load cables or for the drop in
voltage across blocking diodes. The voltage at the output terminals will be higher than that at the load by an amount
equal to the voltage drop due to load lead resistance and/or blocking diodes if used. The maximum voltage at the
terminals cannot exceed the maximum voltage specified for that module.
Always observe the following general rules for remote sense operation :-
Ensure that the remote sense cables are twisted pairs.
PCB tracks for remote sense should be run back to back.
Ensure that the remote sense cables / tracks are as short as
possible.
Ensure that the sense cables are not twisted together with the
power cables.
PCB power tracks and remote sense tracks should be kept
away from each other as far as is possible.
Do not fit components (resistor, inductor or diode) into remote
sense lines. This could make the system unstable.
See the data sheets for each module to see the maximum
voltage drop that remote sense can compensate for, do not
exceed this value.
Load
Load
+V
+V
-V
-V
-S
-S
+S
+S
+Ve Sense
-Ve Sense

Vega Customer Applications Manual Section 1 - Connection
Rev. A3: October 2003 Page 7 of 48
Mating connector information:
N
ote: housing and pins supplied with
each power supply.
Housing: Molex 50-37-5023
Crimp pin: Molex 08-70-1039
Hand Crimp Tool: 69008-0959
(Europe or Japan) Or 11-01-
0204(USA)

Vega Customer Applications Manual Section 2 - Analogue Primary Options
Rev. A3: October 2003 Page 8 of 48
Section 2 - Analogue Primary Options
OPTION E, EV, F, FV, xEV, xFV
The Analogue primary option is a factory fitted option board which provides the following functions:
1) Warning the AC input has been lost or that the converter has overheated.
2) Global inhibit / enable (Global meaning the option inhibits/enables all modules or outputs at the same time).
3) 5V auxiliary supply (5V being present when AC is applied and regardless of inhibit/enable status).
The option board occupies a position to the left of slot 5 as shown:
Pin No. Function
1AC fail and over temperature warning, C
2AC fail and over temperature warning, E
30V of auxiliary supply and 0V "reference" or "return" for global inhibit / enable.
45V auxiliary supply
5Global inhibit/enable logic "0" input
6Global inhibit/enable logic "1" input
INHIBIT OR ENABLE.
One of two options are available (required option must be specified at time of ordering) : Inhibit or Enable.
Both are TTL compatible.
They are physically the same but with different functionality.
Option specified = "INHIBIT"
All outputs normally "ON" (even if not
connected)
PIN 5 taken to 0V-0.8V will turn
outputs OFF. PIN 6 to be taken to 2-5V will turn outputs OFF.
Option specified = "ENABLE"
All outputs normally "OFF" (even if
not connected)
PIN 5 taken to 0V-0.8V will turn
outputs ON. PIN 6 to be taken 2-5V will turn outputs ON.
All voltages are with respect to auxiliary 0Volts (PIN3 ). Both Pin 5 and Pin 6 will draw almost no current being the input to a
comparator with suitable hysteresis.
Mating connector information:
N
ote: housing and pins supplied with each
power supply.
Molex housing 50-37-5063
Molex crimp pins 08-70-1039
Molex hand crimp tool 11-26-0167 (Japan)
Or 11-01-0194 (Europe or USA)
PIN 1
PIN 6

Vega Customer Applications Manual Section 2 - Analogue Primary Options
Rev. A3: October 2003 Page 9 of 48
5V Auxiliary supply.
This is available for powering auxiliary circuits and is present when AC input is applied regardless of inhibit/enable state of the
PSU outputs. The output is rated as SELV.
Output voltage 5V +/- 5% (Option E, F, EV, FV) or 5-15V (Option xEW, xFW)
Max continuous output current 100 mA (Option E, F) or 300mA (Option EV, FV) or 1A (Option xEW, xFW)
Overload protection Current limited and thermally protected
Hold up time 1 Sec minimum
Isolation to earth 500V DC max
Or ‘ENABLE’
Either ‘INHIBIT’
Global Inhibit Logic 0
Pin 5 to be taken to 0-0.8V to
turn outputs off, otherwise
outputs normally on
2 – 5V
0 – 0.8V
Global Inhibit Logic 1
Pin 6 to be taken to 2 – 5V to
turn outputs off, otherwise
outputs normally on
0 – 0.8V
2 – 5V
OUTPUTS ON OUTPUTS OFF OUTPUTS ON OUTPUTS OFF
Global Enable Logic 0
Pin 5 to be taken to 0 – 0.8V
to turn outputs on, otherwise
outputs normally off
Global Enable Logic 1
Pin 6 to be taken to 2 – 5V
to turn outputs on, otherwise
outputs normally off
0 – 0.8V
2 – 5V
OUTPUTS ON OUTPUTS OFF OUTPUTS ON OUTPUTS OFF
2 – 5V
0 – 0.8V

Vega Customer Applications Manual Section 2 - Analogue Primary Options
Rev. A3: October 2003 Page 10 of 48
AC FAIL
Ic max 5mA
Vce max 30V
Warning time to DC output fall 5mS min (see timing diagrams below)
Vce saturated Less than 0.4V
The signal can be configured in two ways:
Either:
Or:
PIN 1
PIN 2
This provides an opto-isolated output which provides a minimum of
5mS warning before loss of output power due to either loss of AC
input or over temperature of the converter.
PIN 1 (AC FAIL SIGNAL)
PIN 2
RES
AC PRESENT AC LOST
OUTPUT VOLTAGE
AC FAIL SIGNAL
>1s
>
5ms
5V AUX
5V
0V AUX
0V
AC LOST
OUTPUT VOLTAGE
AC FAIL SIGNAL
>
5ms
5V
PIN 1
PIN 2 (AC FAIL SIGNAL)
RES
AC PRESENT
5V AUX
0V AUX
0V

Vega Customer Applications Manual Section 3 - Analogue Secondary options
Rev. A3: October 2003 Page 11 of 48
Section 3 - Analogue Secondary options
Secondary Option N.
The N option is a factory fitted assembly that can be specified for output modules. The option has the following function:
Module Good, output signal that indicates when the module is within 10% of the set voltage level.
Module Inhibit, this enables the individual module to be shut down by application of an inhibit signal.
Starpoint Paralleling, can be used in N+1 redundant applications to force paralleled modules to share the load current or can be
used to parallel 2 or more modules to increase the available output current.
N option for SINGLE, One and a Half and Dual slot modules.
Pin No Function
1Unused.
2Module Good E
3+Ve Sense. *1
4Module Good C
5Starpoint Parallel.
6Unused.
7Starpoint Parallel.
8Module Inhibit -Ve
9-Ve Sense. *1
10 Module Inhibit +Ve
Note *1: Option board +ve sense and module +ve sense (2pin molex) are internally connected.
Mating connector information:
Note: housing and pins supplied with each
power supply.
Housing: Molex 51110-1060
Crimp pin: Molex 50394-8051
Hand Crimp Tool: 69008-0959 (Europe or
Japan) Or 11-01-0204(USA)
Viewed from rear of PSU
9 7 5 3 1
10 8 6 4 2

Vega Customer Applications Manual Section 3 - Analogue Secondary options
Rev. A3: October 2003 Page 12 of 48
N option for TWIN (2 output) modules.
There is one 6 pin connector for EACH output. The connector for that output is directly adjacent to the faston output
terminals for that output.
Pin No Function
1Module inhibit -Ve
2Module inhibit +Ve
3Module Good E
4Module Good C
5-Ve sense. *1
6+Ve sense. *1
Note *1 : option board +ve sense and module +ve sense (2pin molex) are internally connected.
Module Inhibit circuit connection
When a module is inhibited, there may be up to 0.6V remaining at the outputs of the module.
Mating connector information:
Note: housing and pins supplied with
each power supply.
Housing: Molex 50-37-5063
Crimp pin: Molex 08-70-1039
Hand Crimp Tool: 11-26-0167 (Japan)
Or 11-01-0194(Europe or USA)
PIN 6
PIN 1
Viewed from rear of PSU
0 – 0.8V
2 – 5V
OUTPUTS ON OUTPUTS OFF
Module inhibit +Ve
390R
Module inhibit -Ve
Internal to the module inhibit is a 390ohm 1/8W resistor
and the diode of an opto-coupler.
To INHIBIT the module apply 2-5V between +ve and -ve.
Do not apply >6V or damage may result, although higher
voltages may be used to drive the circuit in which case
additional series resistor should be used to limit the
current. A current of 1-10mA will inhibit the module.
Ensure 13
mA is not exceeded.

Vega Customer Applications Manual Section 3 - Analogue Secondary options
Rev. A3: October 2003 Page 13 of 48
Module Good Circuit connections.
The output stage is an uncommitted transistor of an opto-coupler. The transistor is “ON” (saturated) when module is
“GOOD”.
"Low" when module good.
"High" when module good.
Module good C (Collector)
Module good E (Emitter)
Module is GOOD when output voltage is between
90%(+/-5%) and 110%(+/-5%) of its factory set
voltage.
Vce max 30V
Vce sat <0.4V at 1mA current
Ic max 1mA
E
C
Output Voltage
Module Good Signal
V
0V
Module Good signal
Module Good Signal
E
C
Output Voltage
0V
Module Good signal

Vega Customer Applications Manual Section 3 - Analogue Secondary options
Rev. A3: October 2003 Page 14 of 48
Starpoint Parallel Circuit connection.
Starpoint parallel circuit connection is achieved by "daisy chaining" all the parallel pins together in any group of
modules required to share.
PIN 5
PIN 7
PIN 5
PIN 7
PIN 5
PIN 7
All the PIN 5 and PIN 7 perform the same function and are linked internally in the module.
Functionally, the shared parallel connection forces each module of a pair to drive approximately the same current.
Whichever module is driving the least current has it's voltage increased slightly to balance it. The load current is
shared evenly amongst the modules. This improves the reliability by ensuring that no one module takes more stress
than any others in a sharing group.
Sharing can take place from module to module within the same power supply or between modules configured in
different power supplies.
MODULE 1
MODULE 2
MODULE 3
MODULE n

Vega Customer Applications Manual Section 3 - Analogue Secondary options
Rev. A3: October 2003 Page 15 of 48
N+1 redundant & "Hot Swap"
Vega power supplies can be connected in 1+1 redundant with active current share utilising the "N" option. This allows
one of the power supplies to fail and the system remain running as the other power supply can drive the required
current. Further, whilst both power supplies are running neither supplies more power than the other so the currents
and hence stresses and heating effects are evenly shared. This principal can be extended to N+1 redundant where
any number of power supplies can be connected in parallel actively sharing the required current such that the failure of
one will not affect the system.
The principal can be extended further to "hot swap". This allows a failed power supply to be removed and replaced
with the system fully live and driving the full load current. Normally a Vega power supply would be incorporated in a
"shuttle" on sliding rails with a "hotswap" self aligning output which can be easily connected / disconnected from a
system.
The diagram below shows a typical arrangement for 1+1 redundant system.
+S
+V
-S
-V
+S
+V
-S
-V
Pin 8/9 Pin 8/9
MODULE 1 MODULE 2 1+1 Current sharing system Remote Sensed.
Remote sense is NOT TRUE redundant function.
Shuttle 1 or 2 failing can influence shuttle 2 via the
sense lines.
Not shown are the L, N and Earth connections. It is
important when designing connectors for hot swap
applications that the EARTH is made first and broken
last (ie use an extended earth pin).
The +S and -S should be made first and broken last
also.
Remember a lot of heat may be dissipated by the
blocking diodes. Be sure to rate them correctly.

Vega Customer Applications Manual Section 3 - Analogue Secondary options
Rev. A3: October 2003 Page 16 of 48
+S
+V
-S
-V
+S
+V
-S
-V
Pin 8/9 Pin 8/9
MODULE 1 MODULE 2
+S
+V
-S
-V
+S
+V
-S
-V
Pin 8/9 Pin 8/9
MODULE 1 MODULE 2
1+1 Current sharing system Locally Sensed
Locally sensed is TRUE redundant function. Shuttle 1
or 2 failing cannot influence the other shuttle. The
system will always remain functional.
Not shown are the L, N and Earth connections. It is
important when designing with connectors for hot swap
applications that that EARTH is made first and broken
last (ie use an extended earth pin).
Remember a lot of heat may be dissipated by the
blocking diodes. Be sure to rate them correctly.
Parallel for increased current : Not redundant.
In the absence of blocking diodes, there is no
redundancy. A short circuit in shuttle 1 will pull shuttle
2 down. This is normally used just to increase the
available output current.

Vega Customer Applications Manual Section 3 - Analogue Secondary options
Rev. A3: October 2003 Page 17 of 48
Remote Sense option “R” (Twin output only)
(All single, one and a half and dual slot single output modules have remote sense provided as standard, remote sense
is also provided with “N” option fitted to twin output modules)
The “R” option is a factory fitted board that can be specified for twin (2 output) modules only. It enables remote
sensing at the load. For twin output modules the “R” option is required to achieve remote sensing.
There is one 2 pin connector for each output. The connector for that output is directly adjacent to the faston output
terminals for that output.
When connecting the remote sense leads to the load, always use cables twisted together at approx 1 twist per
centimetre. This will minimise noise pickup.
Application note "Power Connection" has more detailed information on the recommended way to connect Vega to
function with remote sense.
Pin No Function
1+ve sense
2-ve sense
PIN 2
PIN 1
Mating connector information:
Note: housing and pins supplied with
each power supply.
Housing: Molex 50-37-5023
Crimp pin: Molex 08-70-1039
Hand Crimp Tool: 11-26-0167 (Japan)
Or 11-01-0194(Europe or USA)

Vega Customer Applications Manual Section 4 - Output Ripple and Noise
Rev. A3: October 2003 Page 18 of 48
Section 4 - Output Ripple and Noise
The Measurement of ripple and noise.
Lambda measures ripple and noise on switching power supplies using an oscilloscope with the bandwidth limited to
20Mhz. The measurement is taken at the end of a 150mm length pair of twisted cables terminated with 10uF
electrolytic capacitor and 0.1uF ceramic capacitor. The earth wire of the oscilloscope probe should be as short as
possible, winding link wire around the earth collar of the probe is the preffered method.
Noise from a switching power supply is made up of two distinct elements "ripple" and "high frequency". "Ripple" noise
is the variation at the switching frequency of the supply. "High frequency" noise is superimposed on top of the "ripple"
and results in a typical waveform as below.
The term PARD means "Periodic and Random Deviation" and is a measure of the TOTAL noise (ie high fequency
noise + ripple) quoted as peak to peak. This is the figure quoted in the specifications of each module.

Vega Customer Applications Manual Section 4 - Output Ripple and Noise
Rev. A3: October 2003 Page 19 of 48
Minimising System noise.
The application note "Vega Connection" gives information on basic connection of Vega and good wiring practice. This
includes using twisted pairs for cabling and de-coupling at loads. This will help minimize noise in a system designed
using Vega power supplies.
There is also an Application note "EMC Installation Notes" in Section 8 which gives more detailed information on
installation to improve EMC performance and reduce system noise.
During system design, if there are any noise problems encountered, there are a number of common causes:
1) No (or insufficient) de-coupling on the PCB and/or at the load.
2) Poor system earthing.
3) Poor routing of the wiring cables.
4) Faulty wiring connection or bad terminations.
5) PCB tracking or cabling insufficient for peak currents carried.
6) Power supply being intermittently overloaded. (High switching currents drawn).
There are a number of practical steps that can be used to help reduce or identify the source of high frequency noise:
1) Try and ascertain if the noise is radiated or conducted by re-orienting the PSU or by screening. If neither helps, the
noise is likely to be conducted noise.
2) Common zero volt connections should be made with the shortest possible wiring either directly or via a capacitor to
the nearest point on the chassis.
3) Ensure the common earth / zero volt connection is connected to the system starpoint earth once only and not by
any other route.
4) Twist all pairs of power and sense cables separately.
5) Try connecting a "ring" of capacitors (100nF ceramics) from rail to rail.
6) Decouple individual rails at the load using capacitors (eg 100nF ceramics).

Vega Customer Applications Manual Section 5 - Fans and Cooling
Rev. A3: October 2003 Page 20 of 48
Section 5 - Fans and Cooling
Installation for best Airflow.
The exceptional power densities of Vega are achieved by careful thermal design and forced air cooling from an integral
fan. Airflow can be forward in which case air is drawn in at the fan end and exhausted from the module or reverse in
which air is drawn in at the module end and exhausted via the fan end. In the specification "Ambient air temperature" is
taken to be the air entering the fan (forward) or entering the module end (reverse).
Best performance is achieved using forward flow air. Forward or reverse airflow must be specified at time of purchase.
The available output power is de-rated for reverse air applications. Contact Technical sales to discuss carefully any
reverse air requirements to ensure adequate cooling is maintained or the correct de-rating of output power is adhered
to.
In both forward and reverse flow, adequate cooling can only be maintained by ensuring that obstructions to airflow are
kept 50mm from the fan end and 50mm from the module end of the power supply where air is drawn in / exhausted.
Always design a system so that the coolest possible air is routed to the intake of the power supply. Try and avoid
using "re-circulated air" by having highly enclosed boxes with the exhaust in the box itself. A clear flow path from an
intake of the coolest available air (ie outside of an installation box), through power supply and exhausted back out into
the same air is always best. Where Vega is used in a fully enclosed box with re-circulating air it is important to ensure
that the air temperature being drawn into the Vega itself is sufficiently cool.
Audible noise from the Fans.
Measurements have been taken with a background noise level of approximately 38dB. All measurements were taken
at a distance of 1m from the fan grill, with the fan end closest to the noise meter.
Results
Fan option
nomenclature Air Direction Fan Type Typ fan Voltage Audible Noise (dB @ 1m)
Forward Papst 612NHH 12.5V 55.0FForward Sanyo 109R0614E402 14V 57.0
Forward Papst 612 12.2V 49.1QForward Papst 612NH 12.4V 49.7
Reverse Sanyo 109R0614E402 14V 61.0RReverse Papst 612NHH 12.5V 60.3
Reverse Papst 612 12.2V 56.4PReverse Papst 612NH 12.4V 53.2
Restricting the air intake by placing (for example) another grill in front of the fan can cause a "chopping" effect created
by non-planar flow of the air into the fan which may increase the audible noise as well as reduce airflow.