Hi-Rel LIMITOR MODULE
LGDS-300 : up to 300W POWER
Hi-Rel
Grade
80V or 100V Transient Protection Module
MIL-STD-704A & MIL-STD-1275
Metallic Case
• Ultra compact limitor module
• Transient suppressor module 80V
• MIL-STD-704A/D/E/F, EN2282, AIR2021E
• DO160E cat A, B and Z
• Transient suppressor module 100V
• MIL-STD-1275A/B/C/D,
• Power range : up to 300W
• Inrush current limitation
• RoHS process
The GAIA Converter limitor LGDS-300 is an ultra
compact power adaptator module designed to
allow operation during voltage transients and
spikes, occuring in avionics or military systems.
The LGDS-300 delivers an output voltage adapted
to GAIA Converter DC/DC modules. This module
is optimized to provide high power efficiency up
to 99% over the whole power range up to 300W.
The LGDS-300 features 3 modes of operations
as follow:
•
Normal operation :
Normal operation occurs in between the per-
manent input voltage of the DC/DC converter;
The LGDS-300 is then operating in steady
transparency state.
•
Power fail operation
:
The power fail operation occurs when the
input bus drops below 9 Vdc low voltage
limit ; an undervoltage lock-out stops the
LGDS-300.
•
Transient operation :
The LGDS-300 clamps input transient up
to 80V/100ms or 100V/50ms.
The LGDS-300 series is compliant with the inter-
national input bus standards :
- MIL-STD-704A/D/E/F
- AECMA EN2282
- GAM-EG13B/AIR2021E
- DO160E cat A, B and Z
- MIL-STD-1275A/B/C/D
1- General
4
The design has been carried out with
surface mount components and is manufactured
in a fully automated process to guarranty high
quality. Every module is tested with a Gaïa
Converter automated test equipment. The mo-
dules are potted with a bi-component thermal
conductive compound and packaged in a metallic
case to ensure the module’s integrity under
severe environmental conditions.
2- Product Selection
LGDS - 300 -
input
output
/
option
Input Voltage Range
Transient
O : 100V/50ms
Output
K
Options :
/T : option for -55°C start up operating temperature
/S : option for screening and serialization
REDEFINING THE SOURCE OF POWER
©
Gaia Converter FC08-059.01/10 Revision D
For locations, phone, fax, E-Mail see back cover
LGDS-300 Series
3- Modes of Operation
3-1 LGDS-300 Modes of Operation
The LGDS-300-O-K operates with H input family of GAIA
Converter DC/DC Converters.
The LGDS-300-O-K features 3 modes of operations as
describes in the following state diagram :
•
Normal operation :
Normal operation occurs in between 9V and 42V input
voltage; the module is then operating in steady
transparency state.
•
Power fail operation
:
When a failure occurs such as an undervoltage, an
over current or an over temperature, the LGDS-300
turns to power fail mode and stops operation until
the failure is removed. The LGDS-300 features 3 pro-
tection functions : input undervoltage lockout (UVLO),
output over current protection (OCP) and over
temperature protection (OTP).
•
Transient operation :
When a surge occurs, the LGDS-300 turns to transient
mode operation. It clamps input transient up to 100V
as long as 50ms.
During this transient mode, the over current protec-
tion (OCP) is activated in order to prevent applica-
tions failure.
Normal Mode
(Vout=Vin-Vdrop)
Hi-Rel
Grade
OCP
OTP
Start-up
Surge
Vin>Vst
UVLO
End of
Surge
Power fail Mode
(output disabled)
Transient Mode
(Vout=Vlim)
OTP
OCP
: Over Temperature Protection
: Over Current Protection
4
LGDS-300 Transfer Function
45
40
Power fail
operation area
35
30
Normal operation
Area
Transient operation
Area
output voltage (Vdc)
25
20
15
10
5
0
0
10
20
30
Input voltage (Vdc)
40
50
60
70
80
90
100
©
2
Gaia Converter FC08-059.01/10 Revision D
For locations, phone, fax, E-Mail see back cover
LGDS-300 Series
4- Electrical Specifications
Data are valid at +25°C, unless otherwise specified.
Hi-Rel
Grade
Parameter
Conditions
Limit or
typical
Units
LGDS-300
Input
Permanent input
Full temperature range
voltage range (Ui)
Full load
in normal operation
Minimum
Maximum
Maximum
Maximum
MIL-STD-704A/F
AECMA EN2282
AIR2021E
DO160E cat A/Z
MIL-STD-1275A/D
MIL-STD-704A/F
AECMA EN2282
AIR2021E
DO160E cat A/Z
MIL-STD-1275A/D
Minimum
Maximum
Maximum
Typical
Maximum
VDC
VDC
VDC/ms
VDC/s
80V/75ms
60V/50ms
60V/100ms
80V/100ms
100V/50ms
600V/10µs
400V/100µs
600V/10µs
600V/10µs
250V/70µs
VDC
VDC
ms
A
mA
9
42
100V/50ms
48V/1s
Compliant
Compliant
Compliant
Compliant
Compliant
Compliant*
Compliant*
Compliant*
Compliant*
Compliant*
7
9
6
5
10
Compliance with
standards voltage
transient limit
Full temperature range
Compliance with
standards voltage
spike limit
*with companion
filter FGDS series
Under voltage
lock- out (UVLO)
Start up time
50 Ohms impedance
50 Ohms impedance
50 Ohms impedance
50 Ohms impedance
15 mJ energy content
Turn-on/Turn-off threshold
Ui nominal 28V
Full load
Full temperature range
C=1000µF
Ui nominal 28V
No load
Inrush current
limitation
No load input
current
Output
Nominal voltage in Ui < 42V
normal operation
Full load
Nominal voltage in
In transient
transient
Input voltage range
protection mode
Output voltage
During start-up time
slew rate
Full temperature range
Output current
Ui min. to max.
Full temperature range
Output Power
Ui min. to max.
Ui nominal 28V
Power dissipation
Output current 20A
4
Minimum
Minimum
Nominal
Maximum
Typical
Maximum
Maximum
Maximum
/
VDC
VDC
VDC
VDC/ms
A
W
W
Ui - 125mV
40
42
44
5
20 (or 300W)
see page 4
figure 5
3
©
3
Gaia Converter FC08-059.01/10 Revision D
For locations, phone, fax, E-Mail see back cover
LGDS-300 Series
4- Electrical Characteristics (continued)
Hi-Rel
Grade
Figure 1 : LGDS-300-O-K Transient Response at 80Vdc
(according to DO-160D/E/F)
Figure 2 : LGDS-300-O-K Transient Response at 100Vdc
(according to MIL-STD-1275D)
4
Figure 3 : LGDS-300-O-K Output Power versus Input Voltage
Figure 4 : LGDS-300-O-K Start-up Timing
350
300W max
300
250
Pout (W)
200
150
100
50
0
0
10
20A max
Permanent operation
Area
Transient operation
Area
20
30
40
50
60
Vin (Vdc)
70
80
90
100
©
4
Gaia Converter FC08-059.01/10 Revision D
For locations, phone, fax, E-Mail see back cover
LGDS-300 Series
4- Electrical Characteristics (continued)
Hi-Rel
Grade
The following figures describe the LGDS-300-O-K maximum admissible energy in compliance with standard requirements for
single pulse and repetitive surge conditions.
LGDS-300-O-K Maximum Admissible Energy in Single Pulse Condition
75.00
70.00
65.00
60.00
55.00
Limitor Dissipated Energy (J)
50.00
45.00
40.00
35.00
30.00
25.00
20.00
15.00
10.00
5.00
0.00
0.
4
0.
45
0.
7
0.
75
0.
5
0.
55
1
1.
05
0.
1
0.
15
0.
05
0.
2
0.
25
0.
3
0.
35
0.
8
0.
85
0.
9
0.
95
0.
6
0.
65
1.
1
1.
15
1.
3
1.
35
1.
5
1.
55
1.
6
1.
65
1.
2
1.
25
1.
4
1.
45
DO-160E/CATZ worst case
60V / 510ms
MIL-STD-1275D worst case
75V / 240ms
MIL-STD-1275C worst case
68V / 170ms
MIL-STD-1275A/B worst case
85V / 70ms
MIL-STD1275C
MIL-STD1275D
DO160E-CATZ
MILSTD1275A/B
VIN
LGDS300
42V
300W
MIL-STD-1275A/B/C/D
(100V/50ms)
4
time (s)
LGDS-300-O-K Maximum Admissible Energy in Repetitive Surge Condition
300.00
275.00
250.00
225.00
Limitor dissipated energy (J)
200.00
175.00
150.00
125.00
100.00
75.00
50.00
25.00
0.00
0
0.5
1
1.5
2
2.5
3
3.5
time (s)
4
4.5
5
5.5
6
6.5
7
80V/100ms pulses
3 pulses at 10 sec interval
according DO-160E standard testing
LGDS-300-O-K
MIL-STD-1275C/D Repetitive surge at
worst case energy operation
100V/50ms pulses
7 pulses at 1sec interval
according MIL-STD-1275C
standard testing
100V/50ms pulses
5 pulses at 1sec interval
according MIL-STD-
1275A/B/D
©
5
Gaia Converter FC08-059.01/10 Revision D
For locations, phone, fax, E-Mail see back cover
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