IRF M3G501215TCKA Hybrid-high reliability radiation hardened dc-dc converter Datasheet

PD-94559M
M3G-SERIES
HYBRID-HIGH RELIABILITY
RADIATION HARDENED
DC-DC CONVERTER
50V Input, Triple Output
Description
The M3G-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.
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 0.475" package
constructed of an Aluminum-Silicon-Carbide (AlSiC)
base and an Alloy 48 ring frame and they weigh less
than 110 grams. The package utilizes rugged ceramic
feed-through copper core pins and is sealed using
parallel seam welding.
Manufactured in a facility fully qualified to MIL-PRF38534, these converters are fabricated utilizing DLA
Land and Maritime qualified processes. For available
screening options, refer to device screening table in the
data sheet.
Non-flight versions of the M3G-Series converters are
available for system development purposes. Variations
in electrical specifications and screening to meet custom
requirements can be accommodated.
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M3G
Features
n Total Dose > 200 krad(Si),
typically usable to > 300 krad(Si)
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
SEE Hardened up to 82 MeV.cm2/mg
Low Weight, < 110 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
n
n
n
Geostationary Earth Orbit Satellites (GEO)
Deep Space Satellites / Probes
Strategic Weapons and Communication
Systems
1
09/12/12
M3G-SERIES
(50V Input, Triple Output)
Circuit Description
The M3G-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 reduces the conducted emissions
to less than 5mA rms 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.
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
36 volts and will shut down when the input voltage
drops below 34 volts. This two volts of hysteresis
reduces the possibility of line noise interfering with
the converter’s start-up and shut down.
2
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 M3G-Series was developed using a proven
conservative design methodology which includes
selecting radiation tolerant and established reliability
components and fully derating to the requirements
of MIL-STD-975 and MIL-STD-1547 except for the
CDR type ceramic capacitors, a capacitor with 50V
rating is used for in-circuit voltage stress of less than
10V. Careful sizing of decoupling capacitors and
current limiting resistors minimizes the possibility of
photo-current burn-out. Heavy derating of the
radiation hardened power MOSFET virtually
eliminates the possibility of SEGR and SEB. A
magnetic feedback circuit is utilized instead of optocouplers 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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M3G-SERIES
(50V Input, Triple Output)
Specifications
Absolute Maximum Ratings
Recommended Operating Conditions
Input voltage range
Input voltage range
-0.5Vdc to +80Vdc
+38Vdc to +60Vdc
Output power
Internally limited
Output power
0 to Max. Rated
Lead temperature
300°C for 10 seconds
Operating case temperature 1
-55°C to +125°C
Operating temperature
-55°C to +135°C
Storage temperature
-55°C to +135°C
1
Electrical Performance Characteristics
Parameter
Input Voltage
Group A
Subgroup
For operation at +125°C see table note 15
Conditions
-55°C ≤ TC ≤ +85°C
VIN = 28V DC ± 5%, CL = 0
unless otherwise specified
Limits
Unit
Min
Nom
Max
1, 2, 3
Note 2
38
50
60
V
(main)
M3G500512T (aux.)
M3G500515T (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
(main)
M3G500512T (aux.)
M3G500515T (aux.)
2, 3
IOUT = 100% rated load, Note 5
4.93
±11.30
±14.40
5.07
±12.30
±15.40
1, 2, 3
VIN = 38, 50, 60 Volts, Note 2
0
40
W
1, 2, 3
VIN = 38, 50, 60 Volts, Notes 2,3,4,5
400
±83
±67
4000
±833
±667
mA
1, 2, 3
IOUT = 10%, 50%, 100% rated
VIN = 38, 50, 60 Volts
Note 5
-10
-120
-150
10
120
150
mV
1, 2, 3
IOUT = 10%, 50%, 100% rated
VIN = 38, 50, 60 Volts
Notes 5,13
-50
-400
-500
50
400
500
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 )
V
Output power ( POUT )
Output current ( IOUT )
(main)
M3G500512T (aux.)
M3G500515T (aux.)
Line regulation ( VRLINE )
(main)
M3G500512T (aux.)
M3G500515T (aux.)
Load regulation ( VRLOAD )
(main)
M3G500512T (aux.)
M3G500515T (aux.)
Cross regulation ( VRCROSS )
(main)
M3G500512T (aux.)
M3G500515T (aux.)
%
For Notes to Electrical Performance Characterstics Table, refer to page 5
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3
M3G-SERIES
(50V Input, Triple Output)
Electrical Performance Characteristics
Parameter
Input current ( IIN )
( continued )
Group A
Subgroup
Conditions
-55°C ≤ TC ≤ +85°C
VIN = 28V DC ± 5%, CL = 0
unless otherwise specified
1, 2, 3
IOUT = 0, Pin 3 open
80
Pin 3 shorted to pin 2
5.0
Limits
Min
Nom
Max
Unit
mA
Output ripple ( VRIP )
1, 2, 3
VIN = 38, 50, 60 Volts
I OUT = 100% rated load, Notes 5, 6
Switching frequency ( FS )
1, 2, 3
Sync. Input (Pin 4) open
Efficiency ( Eff )
1, 2, 3
(main)
M3G500512T (aux.)
M3G500515T (aux.)
Inhibit Input
open circuit voltage
drive current ( sink )
voltage range
25
30
30
50
60
75
mV p-p
450
500
550
KHz
IOUT = 100% rated load
Note 5
75
79
Note 1
3.0
-0.5
Synchronization Input
frequency range
pulse high level
pulse low level
pulse transition time
pulse duty cycle
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
0.5
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
Recovery time,
step load changes (TTLD)
Output response to
step line changes (VTLN)
18V to/from 50V
IOUT = 100% rated load, Notes 1,5,11
Recovery time,
step line changes (TTLN)
18V to/from 50V
IOUT = 100% rated load, Notes 1,5,10,11
-300
-300
100
µs
300
mV pk
100
µs
For Notes to Electrical Performance Characterstics Table, refer to page 5
4
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M3G-SERIES
(50V Input, Triple Output)
Electrical Performance Characteristics
Parameter
Turn-on Response
Overshoot (VOS)
(main)
M3G500512T (aux.)
M3G500515T (aux.)
Group A
Subgroup
( continued )
Conditions
-55°C ≤ TC ≤ +85°C
VIN = 28V DC ± 5%, CL = 0
unless otherwise specified
4, 5, 6
Limits
Min
Nom
No Load, Full Load
Notes 5,12
Turn-on Delay (TDLY)
1.0
Max
Unit
500
750
1000
mV
5.0
ms
1000
200
µF
Capacitive Load (CL)
IOUT = 100% rated load, No effect on DC
performance, Notes 1, 5, 7
(main)
(Each aux. output)
Line Rejection
Isolation
1
IOUT = 100% rated load
DC to 50KHz, Notes 1, 5
40
Input to Output or Any Pin to Case
except pin 10, test @ 500VDC
100
MΩ
Device Weight
MTBF
dB
60
110
MIL-HDBK-217F2, SF, 35ºC
6
5 x 10
g
Hrs
Notes: Electrical Performance Characteristics
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
Parameter is tested as part of design characterization or after design changes. Thereafter, parameter shall be guaranteed to
the limits specified.
Parameter verified during line and load regulation tests.
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.
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.
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.
Guaranteed for a D.C. to 20MHz bandwidth. Tested using a 20KHz to 10MHz bandwidth.
Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.
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.
Overload power dissipation is defined as the device power dissipation with the load set such that V OUT = 90% of nominal.
Load step transition time ³ 10 µs.
Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1% of its steady state value.
Line step transition time ³ 100 µs.
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(pin3 to
the point where V OUT = 90% of nominal.
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.
Although operation at temperatures between +85°C and +125°C is guaranteed, no parametric limits are
specified.
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5
M3G-SERIES
(50V Input, Triple Output)
Radiation Performance Characteristics
Test Inspection
Method
Total Ionizing Dose (Gamma)
Operating bias applied during exposure,
Min
Typ
Unit
200
300
Krads(Si)
MIL-PRF-883, Method 1019
Full Rated Load, VIN = 50V
Dose Rate (Gamma Dot)
Temporary Saturation
Survival
MIL-STD-883, Method 1023
Operating bias applied during exposure,
Full Rated Load, VIN = 50V
4E10
1E11
MIL-STD-883, Method 1017
8E12
1E13
Neutron Fluence
1E8
Rads(Si)/sec
Neutrons/cm2
Heavy Ions (LET)
Single Event Effects
Operating bias applied during exposure,
Full Rated Load, VIN = 50V
SEU, SEL, SEGR, SEB
2
82
MeVxcm /mg
Test lab: Brookhaven National Laboratory,
Tandem Van de Graaff Generator
International Rectifier currently does not have a DLA Land and Maritime certified Radiation Hardness
Assurance Program.
Figure 1. Block Diagram
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
-
SYNC.
4
INPUT
OSCILLATOR
SYNC.
5
OUTPUT
+
PWM
-
RAMP
GENERATOR
REF
SAMPLE
&
HOLD
FEEDBACK
TRIGGER
6
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M3G-SERIES
(50V Input, Triple Output)
Figure 2. ±12V Load Regulation vs 5V Load
14
±12V Magnitudes ( Volts )
13.5
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
Figure 3. ±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
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0.1
0.2
0.3
0.4
0.5
0.6
0.7
±15V Load Current ( Amps each )
0.8
0.9
1
7
M3G-SERIES
(50V Input, Triple Output)
Application Note:
A) Attachment of the Converter
The following procedure is recommended for mounting the converter for optimum cooling and to circumvent
any potential damage to the converter.
Ensure that flatness of the plate where M3G converter to be mounted is no greater than 0.003” per linear inch.
It is recommended that a thermally conductive gasket is used to promote the thermal transfer and to fill any
voids existing between the two surfaces. IR recommends Sil-Pad 2000 with the thickness of 0.010". The
shape of the gasket should match the footprint of the converter including the mounting flanges. The gasket
is available from IR. The M3G-series converter requires either M3 or 4-40 size screws for attachment
purposes.
The procedure for mounting the converter is as follows:
1.
Check the mounting surfaces and remove foreign material, burrs if any or anything that may
interfere with the attachment of the converter.
Place the gasket on the surface reserved for the converter and line it up with the mounting holes.
Place the converter on the gasket and line both up with mounting holes.
Install screws using appropriate washers and tighten by hand (~ 4 in·oz) in the sequence shown below.
2.
3.
4.
5. Tighten the screws with an appropriate torque driver. Torque the screws up to 6 in·lb in the sequence
shown above.
8
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M3G-SERIES
(50V Input, Triple Output)
Mechanical Diagram
3.055 MAX.
0.500
0.080
Max.
2.00
R0.0625
4 places
0.30
0.50
0.20
13
1
12
2
11
10
0.60
9
3
8
4
7
5
6
2.055
MAX.
2.30
2.500
0.200 Typ.
Noncum.
1.400
Ref.
Pin
Ø0.040
0.45
1.10
0.260
FLANGE DETAIL
3.50
Ref.
2
.06
R0
0.25
0.25
5
0.14
0.475
MAX.
0.40
Tolerance :
.XX
.XXX
±0.01
±0.005
Pin Designation (Triple)
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Pin #
Designation
Pin #
Designation
1
+ Input
8
NC
2
Input Return
9
NC
3
Inhibit
10
Case Ground
4
Sync. Input
11
- Aux. Output
5
Sync. Output
12
Aux. Output Return
6
Main Return
13
+Aux. Output
7
+ Main Output
9
M3G-SERIES
(50V Input, Triple Output)
Device Screening
Requirement
MIL-STD-883 Method
Temperature Range
No Suffix
d
CK
d
EM
-55°C to +85°C
-55°C to +85°C
-55°C to +85°C
Element Evaluation
MIL-PRF-38534
Class K
Class K
N/A
Non-Destructive Bond Pull
2023
Yes
Yes
N/A
Internal Visual
2017
Yes
Yes
c
Temperature Cycle
1010
Cond C
Cond C
Cond C
Constant Acceleration
2001, Y1 Axis
3000 Gs
3000 Gs
3000 Gs
PIND
2020
Cond A
Cond A
N/A
Burn-In
1015
320 hrs @ 125°C
320 hrs @ 125°C
48 hrs @ 125°C
( 2 x 160 hrs )
( 2 x 160 hrs )
Final Electrical
MIL-PRF-38534
-55°C, +25°C,
-55°C, +25°C,
-55°C, +25°C,
( Group A )
& Specification
+85°C
+85°C
+85°C
PDA
MIL-PRF-38534
2%
2%
N/A
Seal, Fine and Gross
1014
Cond A, C
Cond A, C
Cond A
Radiographic
2012
Yes
Yes
N/A
External Visual
2009
Yes
Yes
c
Notes:
c
d
Best commercial practice.
CK is a DLA Land and Maritime (formerly DSCC) part marking used to designate a Class K compliant hybrid.
The CK marking does not indicate the hybrid is radiation certified.
No Suffix is a radiation rated device but not available as a DLA Land and Maritime qualified SMD per MIL-PRF-38534.
International Rectifier currently does not have a DLA Land and Maritime certified Radiation Hardness Assurance Program.
Part Numbering
M3G 50 05 15 T /XX X
Model
Nominal Input
Voltage
50 = 50V
Main Output
Voltage
03R3 = 3.3V
05 = 5V
12 = 12V
15 =15V
Lead Finish for CK only
C = Gold Plated
A = Solder Dipped
Blank for No Suffix and EM
Lead Finish for No Suffix = Gold Plated
Lead Finish for EM is Gold Plated or
Solder Dipped depending on availability
Screening Level
(Please refer to Screening Table)
No Suffix, CK, EM
Output
T = Triple
Auxiliary Output Voltage
05 = ± 5V, 12 = ± 12V
15 = ± 15V
WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 252-7105
IR SAN JOSE: 2520 Junction Avenue, San Jose, California 95134, Tel: (408) 434-5000
Visit us at www.irf.com for sales contact information.
Data and specifications subject to change without notice. 09/2012
10
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