ETC M3G500515T

PD - 94559A
G-SERIES
ADVANCED ANALOG
HIGH RELIABILITY RADIATION
HARDENED DC/DC CONVERTER
50V Input, Triple Output
Description
The G-Series of DC/DC converters are radiation hardened, high reliability converters designed for extended
operation in hostile environments. Their small size and
low weight make them ideal for applications such as
geostationary earth orbit satellites and deep space
probes. They exhibit a high tolerance to total ionizing
dose, single event effects and environmental stresses
such as temperature extremes, mechanical shock, and
vibration. All components are fully derated to meet the
requirements of MIL-STD-975, MIL-STD-1547 and
GSFC PPL-21 Appendix B. Extensive documentation
including Radiation Susceptibility, Thermal, Stress,
Worst Case, Failure Modes and Effects analyses and
MTBF are available for customer review and included
with each order.
The converters incorporate a fixed frequency single
ended forward topology with magnetic feedback and
an internal EMI filter that utilizes multilayer ceramic capacitors that are subjected to extensive lot screening
for optimum reliability. These converters are capable of
meeting the conducted emissions and conducted susceptibility requirements of MIL-STD-461C without additional components. External inhibit and synchronization input and output allow these converters to be easily
incorporated into larger power systems. They are enclosed in a hermetic 3" x 2" x 0.445" package constructed
of an Aluminum/Silicon-Carbide (Al/SiC) base and an
Alloy 48 ring frame and they weigh less than 80 grams.
The package utilizes rugged ceramic feed-through copper core pins and is sealed using parallel seam welding.
Full environmental screening includes temperature cycling, constant acceleration, fine and gross leak, particle
impact noise detection (PIND), radiographic and 320
hours burn-in.
Non-flight versions of the G-Series converters are available for system development purposes. Variations in
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Features
n Total Dose > 200K Rad(Si),
typically usable to > 1M Rad(Si)
n
n
n
n
n
n
n
n
n
n
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n
n
n
n
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SEE > 82 MeV.cm2/mg
Low Weight, < 90 grams
Low Input & Output Noise
Magnetically Coupled Feedback
38V to 60V DC Input Range
Up to 40W Output Power
Triple Output Models Include
+5V and ±12V or ±15V
Main Output Isolated from Dual Outputs
High Efficiency - to 80%
-55°C to +125°C Operating Temperature
Range
100MΩ @ 500VDC Isolation
Under-Voltage Lockout
Synchronization Input and Output
Short Circuit and Overload Protection
Output Over Voltage Limiter
External Inhibit
5,000,000 Hour MTBF
Applications
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Geostationary Earth Orbit Satellites (GEO)
Deep Space Satellites / Probes
Strategic Weapons and Communication
Systems
electrical specifications and screening to meet
custom requirements can be accommodated.
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10/24/02
G-SERIES
Circuit Description
The G-Series converters utilize a single-ended forward topology with resonant reset. The nominal
switching frequency is 500kHz. Electrical isolation
and tight output regulation are achieved through the
use of a magnetically coupled feedback. Voltage
feed-forward with duty factor limiting provides high
line rejection and protection against output over voltage in the event of an internal control loop failure.
This mechanism limits the maximum output voltage
to approximately 20% over the nominal regardless of
the line voltage.
An internal EMI filter allows the converter to meet
the conducted emissions requirements of MIL-STD461C on the input power leads. A two-stage output
filter reduces the typical output ripple to less than
20mV peak-to-peak.
The main ( +5 volt ) output is regulated by the control
loop and typically exhibits better than 1% regulation. The auxiliary ( ±12 volt or ±15 volt ) outputs are
maintained through tight coupling in the power transformer and main output filter inductor and typically
exhibit better than 5% regulation. The main output
and auxiliary outputs are isolated from each other.
Output current is limited under any load fault condition to approximately 125% of rated. An overload
condition causes the converter output to behave like
a constant current source with the output voltage dropping below nominal. The converter will resume normal operation when the load current is reduced below the current limit point. This protects the converter
from both overload and short circuit conditions. The
current limit point exhibits a slightly negative temperature coefficient to reduce the possibility of thermal runaway.
2
An under-voltage lockout circuit prohibits the converter from operating when the line voltage is too
low to maintain the output voltage. The converter
will not start until the line voltage rises to approximately 34.5 volts and will shut down when the input
voltage drops below 35.5 volts. The one volt of hysteresis reduces the possibility of line noise interfering with the converter’s start-up and shut down.
An external inhibit port is provided to control converter operation. The nominal threshold relative to
the input return (pin 2) is 1.4V. If 2.0 volts or greater
are applied to the Inhibit pin (pin 3) then the converter will operate normally. A voltage of 0.8V or
less will cause the converter to shut-down. The pin
may be left open for normal operation and has a
nominal open circuit voltage of 4.0V.
Synchronization input and output allow multiple
converters to operate at a common switching frequency. Converters can be synchronized to one
another or to an externally provided clock. This can
be used to eliminate beat frequency noise or to avoid
creating noise at certain frequencies for sensitive
systems.
Design Methodology
The G-Series was developed using a proven conservative design methodology that includes selecting radiation tolerant and established reliability components and fully derating to the requirements of
MIL-STD-975 and MIL-STD-1547. Careful sizing of
decoupling capacitors and current limiting resistors minimizes the possibility of photo-current burnout. Heavy derating of the radiation hardened power
MOSFET virtually eliminates the possibility of SEGR
and SEB. A magnetic feedback circuit is utilized
instead of opto-couplers to minimize temperature,
radiation and aging sensitivity. PSPICE and
RadSPICE were used extensively to predict and
optimize circuit performance for both beginning and
end-of-life. Thorough design analyses include Radiation Susceptibility (TREE ), Worst Case, Stress,
Thermal, Failure Modes and Effects (FMEA) and Reliability (MTBF).
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G-SERIES
Absolute Maximum Ratings
Recommended Operating Conditions
Input voltage range -0.5Vdc to +80Vdc
Output power Internally limited
Lead temperature +300°C for 10 seconds
Operating temperature - -55°C to +135°C
Storage temperature -55°C to +135°C
Input voltage rangeOutput power Operating temperature-
38Vdc to +60Vdc
0 to Max. Rated
-55°C to +125°C
Electrical Performance Characteristics
Parameter
Group A
Subgroup
Input Voltage
Conditions
-55°C ≤ TC ≤ +85°C
VIN = 28V DC ± 5%, CL = 0
unless otherwise specified
Unit
Limits
Min
Nom
Max
1, 2, 3
Note 2
38
50
60
V
(main)
5012T (aux.)
5015T (aux.)
1
IOUT = 100% rated load, Note 5
4.98
±11.50
±14.60
5.00
±11.80
±14.90
5.02
±12.10
±15.20
V
V
V
(main)
5012T (aux.)
5015T (aux.)
2, 3
IOUT = 100% rated load, Note 5
4.93
±11.30
±14.40
5.07
±12.30
±15.40
V
V
V
1, 2, 3
VIN = 38, 50, 60 Volts, Note 2
0
40
W
(main)
5012T (aux.)
5015T (aux.)
1, 2, 3
VIN = 38, 50, 60 Volts, Notes 2,3,4,5
400
±83
±67
4000
±833
±667
mA
mA
mA
(main)
5012T (aux.)
5015T (aux.)
1, 2, 3
VIN = 38, 50, 60 Volts
IOUT = 10, 50%, 100% rated
Note 5
-10
-120
-150
10
120
150
mV
mV
mV
(main)
5012T (aux.)
5015T (aux.)
1, 2, 3
IOUT = 10%, 50%, 100% rated
VIN = 38, 50, 60 Volts
Notes 5,13
-50
-400
-500
50
400
500
mV
mV
mV
1, 2, 3
VIN = 38, 50, 60 Volts
IOUT = 2.5A to 1A and 2.5 to 4A on main
output and ±half rated on aux. outputs
-3.5
-3.0
3.5
3.0
%
%
Output Voltage ( Vout )
Output power ( POUT )
Output current ( IOUT )
Line regulation ( VRLINE )
Load regulation ( VRLOAD )
Cross regulation ( VRCROSS )
Main
(5012T aux.)
(5015T aux.)
For Notes to Specifications, refer to page 5
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3
G-SERIES
Electrical Performance Characteristics
Parameter
( continued )
Conditions
-55°C ≤ TC ≤ +125°C
VIN = 28V DC ± 5%, CL = 0
unless otherwise specified
Group A
Subgroup
Limits
Min
Nom
Max
Unit
Total regulation ( VR )
(main)
5012T (aux.)
5015T (aux.)
Input current ( IIN )
5.10
±13.00
±16.50
1, 2, 3
All conditions of Line, Load,
and Cross Regulation, and
Temperature
4.90
±11.00
±13.50
1, 2, 3
IOUT = 0, Pin 3 open
80
Pin 3 shorted to pin 2
5
V
V
V
mA
Output ripple ( VRIP )
25
30
30
50
60
75
mV p-p
mV p-p
mV p-p
450
500
550
KHz
IOUT = 100% rated load
Note 5
75
79
Note 1
3.0
1, 2, 3
VIN = 38, 50, 60 Volts
IOUT = 100% rated load, Notes 5, 6
Switching frequency ( FS )
1, 2, 3
Sync. Input (Pin 4) open
Efficiency ( Eff)
1, 2, 3
1,2,3
(main)
5012T (aux.)
5015T (aux.)
%
Inhibit Input
open circuit voltage
drive current ( sink )
voltage range
Synchronization Input
frequency range
pulse high level
pulse low level
pulse transition time
pulse duty cycle
-0.5
1, 2, 3
Ext. Clock on Sync. Input (Pin 4)
Note 1
450
4.0
-0.5
40
20
5.0
100
50
V
µA
V
600
10.0
0.5
80
Khz
V
V
V/µS
%
Current Limit Point
Expressed as a percentage
of full rated output power
1, 2, 3
Vout = 90% of Nominal, Note 5
135
%
Power dissipation, load fault (PD)
1, 2, 3
Short Circuit, Overload, Note 8
20
W
Output response to
step load changes (VTLD)
4, 5, 6
Half Load to/from Full Load, Notes 5,9
300
mV pk
4, 5, 6
Half Load to/from Full Load, Note 5,9,10
100
µS
Output response to
step line changes (VTLN)
4, 5, 6
18V to/from 50V
IOUT = 100% rated load, Notes 1,5,11
300
mV pk
Recovery time,
step line changes (TTLN)
4, 5, 6
18V to/from 50V
IOUT = 100% rated load, Notes 1,5,10,11
100
µS
Recovery time,
step load changes (TTLD)
-300
-300
For Notes to Specifications, refer to page 5
4
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G-SERIES
Electrical Performance Characteristics
Parameter
Group A
Subgroup
( continued )
Conditions
-55°C ≤ TC ≤ +125°C
VIN = 28V DC ± 5%, CL = 0
unless otherwise specified
Limits
Min
Nom
Max
Unit
500
750
5
mV
mV
mS
1000
200
µF
Turn-on Response
Overshoot (VOS)
(main)
(aux.)
Turn-on Delay (TDLY)
4, 5, 6
No Load, Full Load
Notes 5,12
1
Capacitive Load (CL)
1
IOUT = 100% rated load, No effect on DC
performance, Notes 1, 5, 7
Line Rejection
1
IOUT = 100% rated load
DC to 50KHz, Notes 1, 5
40
Isolation
1
Input to Output or Any Pin to Case
except pin 10, test @ 500VDC
100
(main)
(Each aux. output)
Device Weight
MTBF
dB
60
MΩ
90
MIL-HDBK-217F2, SF, 35ºC
5 x 106
grams
Hours
Table I. Electrical Performance Characteristics - notes
1.
Parameter is tested as part of design characterization or after design changes. Thereafter, parameter shall be
guaranteed to the limits specified.
2.
Parameter verified during line and load regulation tests.
3.
Although operation with no load is permissible, light loading on the main (+5 volt) output may cause the output voltage
of the auxiliary outputs(±12 volt or ±15 volt) to drop out of regulation. It is therefore recommended that at least 200 mA
or 20 percent of the total output power, whichever is greater, be taken from the main (+5 volt) output.
4.
Although operation with no load is permissible, heavy loading on the main (+5 volt) output may cause the output
voltage of the auxiliary outputs(±12 volt or ±15 volt) to rise out of regulation. It is therefore recommended that at least
50 mA or 20 percent of the total output power, whichever is greater, be taken from the auxiliary (±12 volt or ±15 volt)
outputs.
5.
Unless otherwise specified, “Rated” load is 20W on the main (+5 volt) output and 10 watts each on the auxiliary (±12
volt or ±15 volt) outputs. Load currents of up to 5A and ±1A on the main and auxiliary outputs respectively are
acceptable as long as the total output power does not to exceed 40 watts.
6.
Guaranteed for a D.C. to 20MHz bandwidth. Tested using a 20KHz to 10MHz bandwidth.
7.
Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.
8.
A capacitive load in excess of the maximum limit may interfere with the proper operation of the converter’s overload
protection, causing erratic behavior during turn-on.
9.
Overload power dissipation is defined as the device power dissipation with the load set such that VOUT = 90% of
nominal.
10.
Load step transition time ≤10 mSec.
11.
Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1% of its steady
state value.
12.
Line step transition time ≤100 mSec.
13.
Turn-on delay time from either a step application of input power or a logic low to a logic high transition on the inhibit pin
(pin 3) to the point where VOUT = 90% of nominal.
14.
Load is varied for output under test while the remaining outputs are loaded at 50% of rated. Regulation relative to
output voltage at 50% rated load.
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5
G-SERIES
Radiation Performance Characteristics
Test
Total Ionizing Dose (Gamma)
Dose Rate (Gamma Dot)
Temporary Saturation
Survival
Neutron Fluence
Conditions
Min
Typ
Highest
Level
Tested
Unit
MIL-STD-883, Method 1019
Operating bias applied during exposure,
Full Rated Load, VIN = 28V
200
1000
2000
KRads
(Si)
MIL-STD-883, Method 1023
Operating bias applied during exposure,
Full Rated Load, VIN = 28V
1E8
4E10
1E11
MIL-STD-883, Method 1017
8E12
1E13
Rads
7E10
Rads
(Si)/sec
(Si)/sec
5.4E13
Neutrons
/cm2
Single Event Effects
SEU, SEL, SEGR, SEB
Heavy ions (LET)
Operating bias applied during exposure,
Full Rated Load, VIN = 28V
>82
82
MeV•cm2
/mg
Device Screening
Test Inspection
Method
Condition
Element Evaluation
MIL-PRF-38534 Space Requirements
Nondestructive Bond Pull
MIL-STD-883, Method 2023
Internal Visual
MIL-STD-883, Method 2017
Temperature Cycling
MIL-STD-883, Method 1010
C
Constant Acceleration
MIL-STD-883, Method 2001
A, Y1 axis only
PIND
MIL-STD-883, Method 2020
A
Electrical
In accordance with
device specification
Burn-in
MIL-STD-883, Method 1015
Final Electrical ( Group A )
In accordance with
device specification
Seal
MIL-STD-883, Method 1014
A1
C
Fine Leak
Gross Leak
Radiographic
MIL-STD-883, Method 2012
External Visual
MIL-STD-883, Method 2009
6
320 Hours
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G-SERIES
Block Diagram - Triple Output
Vin
1
EMI
FILTER
+10.5V
INHIBIT 3
UNDER VOLTAGE
LOCKOUT
& INHIBIT
BIAS
SUPPLY
13
+AUX.
OUTPUT
12
AUX.
RETURN
11
-AUX.
OUTPUT
7
+MAIN
6
MAIN
RETURN
10
CASE
GROUND
+5V
SHORT CIRCUIT
&
OVERLOAD
LEVEL
TRANSLATOR
& FET DRIVE
RETURN 2
+
+5V
+5V
EA
-
REF
SYNC.
4
INPUT
+
OSCILLATOR
SYNC.
5
OUTPUT
PWM
-
RAMP
GENERATOR
SAMPLE
&
HOLD
FEEDBACK
TRIGGER
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G-SERIES
±12V Load Regulation vs 5V Load
14
13.5
±12V Magnitudes ( Volts )
13
12.5
12
5V load = 4A
5V load = 2A
11.5
5V load = 0.4A
11
10.5
10
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
±12V Load Current ( Amps each )
0.8
0.9
1
±15V Load Regulation vs 5V Load
18
17.5
±15V Magnitudes ( Volts )
17
16.5
16
15.5
15
5V load = 4A
14.5
5V load = 2A
14
5V load = 0.4A
13.5
13
0
8
0.1
0.2
0.3
0.4
0.5
0.6
0.7
±15V Load Current ( Amps each )
0.8
0.9
1
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G-SERIES
Mechanical Diagram
3.00
0.500
0.080
Max.
2.000
R0.0625
4 places
0.300
0.500
0.200
13
1
12
2
11
10
0.600
9
3
8
4
7
5
6
2.000 2.300
2.500
1.400
Ref.
0.200 Typ.
Non-cum.
Pin
Ø0.040
0.450
1.100
0.260
3.50
Ref.
0.25
Tolerance :
.XX
±0.01
.XXX ±0.005
0.445 Max
Pin Designation (Triple)
Pin
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Signal
+V Input
Input Return
Inhibit
Sync. Input
Sync. Output
Main Return
+Main Output
Pin
Pin 8
Pin 9
Pin 10
Pin 11
Pin 12
Pin 13
Signal
NC
NC
Case Ground
-Aux. Output
Aux. Output Return
+Aux. Output
Part Numbering
M 3G 50 0515 T
M odel
In p u t V o lta g e
5 0 = 5 0 V N o m in a l
O u tp u ts
T = T rip le
O u tp u t V o lta g e
0 5 1 2 = 5 V , ±1 2 V
0 5 1 5 = 5 V , ±1 5 V
WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 322 3331
ADVANCED ANALOG: 2270 Martin Av., Santa Clara, California 95050, Tel: (408) 727-0500
Visit us at www.irf.com for sales contact information.
Data and specifications subject to change without notice. 10/02
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