IRF M3L2805S

PD-94519B
M3L-SERIES
HYBRID - HIGH RELIABILITY
RADIATION TOLERANT
DC/DC CONVERTER
+ 28V Input, Single/Dual Output
Description
The M3L-Series of DC/DC converters are radiation
tolerant, high reliability devices designed for moderate
radiation environments such as those encountered by
low earth orbit satellites and launch vehicles. For higher
radiation environments, the M3G-Series of DC/DC
converters is recommended. Features include small size,
low weight and 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 and MIL-STD-1547 and
GSFC PPL-21 Appendix B. Extensive documentation
including Radiation Susceptibility, Thermal Analysis,
Stress Analysis and MTBF are available.
The converters incorporate a fixed frequency single
forward topology with magnetic feedback and an internal
EMI filter. These converters are capable of meeting the
conducted emissions and conducted susceptibility
requirements of MIL-STD-461C without any additional
components. All models include an external inhibit port
and have an adjustable output voltage. They are
enclosed in a hermetic 1.5" x 2.3" x 0.425" steel package
and weigh less than 85 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 DSCC
qualified processes. For available screening options,
refer to device screening table in the data sheet.
Non-flight versions of the M3L-Series converters are
available for system development purposes. Variations
in electrical specifications and screening to meet custom
requirements can be accommodated. Consult IR Santa
Clara for special requirements.
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M3L
Features
n Total Dose > 25K Rad(Si)
n SEE Hardened to LET up to 37 MeV.cm2/mg
n Internal EMI filter; Converter Capable of
meeting MIL-STD-461C CE03 and CS01
n Low Weight, < 85 grams
n Magnetically Coupled Feedback
n 16V to 50V DC Input Range
n Up to 25W Output Power
n Single and Dual Output Models Include
3.3, 5, 12, 15, ±5, ±12 and ±15V
n High Efficiency to 82%
n -55°C to +125°C Operating Temperature Range
n 100MΩ @ 500VDC Isolation
n Under-Voltage Lockout
n Short Circuit and Overload Protection
n Output Over Voltage Limiter
n Adjustable Output Voltage
n External Inhibit
n 1,500,000 Hour MTBF
Applications
n
n
Low Earth Orbit Satellites (LEO)
Launch Vehicles
1
09/08/06
M3L-SERIES
Circuit Description
The M3L-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-STD-461C
on the input power leads. A single-stage output filter
reduces the typical output ripple to less than 50mV
peak-to-peak.
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 external inhibit port is provided to control converter
operation. The converter’s operation is inhibited
when this pin is pulled low. It is intended to be driven
by an open collector logic device. The pin may be
left open for normal operation and has a nominal
open circuit voltage of 10.5V with respect to the input
return (pin 2).
The output voltage of all models can be adjusted
using a single external resistor.
Design Methodology
The M3L-Series was developed using a proven
conservative design methodology which includes
selecting radiation tolerance and established
reliability components and fully derating to the
requirements of MIL-STD-975 and MIL-STD-1547.
Heavy derating of the power MOSFET gate and drain
voltages minimize the possibility of SEGR and SEB.
A magnetic feedback circuit is utilized instead of optocouplers to minimize temperature, radiation and
aging sensitivity. PSPICE was used extensively to
predict and optimize circuit performance for both
beginning and end-of-life. Thorough design
analyses include Radiation Susceptibility ( TREE ),
Stress, Thermal, and Reliability ( MTBF ).
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M3L-SERIES
Specifications
Absolute Maximum Ratings
Recommended Operating Conditions
Input voltage range
Input voltage range
-0.5Vdc to +60Vdc
Output power
Internally limited
+16Vdc to +60Vdc
1
+16Vdc to +38Vdc
Lead temperature
Input voltage range
+300°C for 10 seconds Output power
Operating temperature
-55°C to +135°C
Operating temperature
2
-55°C to +125°C
Storage temperature
-55°C to +135°C
Operating temperature
1
-55°C to +70°C
1
2
0 to Max. Rated
Meets derating per MIL-STD-1547
For operation at +125°C, see table note 13
Electrical Performance Characteristics
Parameter
Group A
Subgroup
Conditions
-55°C ≤ TC ≤ +85°C
VIN = 28V DC ± 5%, CL = 0
unless otherwise specified
Input Voltage
Output Voltage ( Vout )
M3L2803R3S
M3L2805S
M3L2812S
M3L2815S
M3L2805D
M3L2812D
M3L2815D
M3L2803R3S
M3L2805S
M3L2812S
M3L2815S
M3L2805D
M3L2812D
M3L2815D
Output power ( POUT )
M3L2803R3S
All Others
Output current ( IOUT )
M3L2803R3S
M3L2805S
M3L2812S
M3L2815S
M3L2805D
M3L2812D
M3L2815D
Limits
Min
Nom
Max
Unit
18
28
50
V
3.30
5.00
12.00
15.00
±5.00
±12.00
±15.00
3.33
5.05
12.12
15.15
±5.05
±12.12
±15.15
1
1
1
1
1
1
1
IOUT = 100% rated load
Note 4
3.27
4.95
11.88
14.85
±4.95
±11.88
±14.85
2,3
2,3
2,3
2,3
2,3
2,3
2,3
IOUT = 100% rated load
Note 4
3.23
4.90
11.76
14.70
±4.90
±11.76
±14.70
3.37
5.10
12.24
15.30
±5.10
±12.24
±15.30
1,2,3
VIN = 16, 28, 50 Volts, Note 2
0
0
20
25
1,2,3
VIN = 16, 28, 50 Volts, Note 2
0
0
0
0
0
0
0
6.06
5.00
2.08
1.67
4.00
1.67
1.33
Either Output, Note 3
Either Output, Note 3
Either Output, Note 3
V
W
A
Line regulation ( VRLINE )
1,2,3
VIN = 16, 28, 50 Volts
IOUT = 0, 50%, 100% rated, Note 4
-0.5
0.5
%
Load regulation ( VRLOAD )
1,2,3
IOUT = 0, 50%, 100% rated, Note 4
VIN = 16, 28, 50 Volts
-1.0
1.0
%
1,2,3
VIN = 16, 28, 50 Volts
Duals only, Note 5
-5.0
-3.0
-3.0
5.0
3.0
3.0
%
Cross regulation ( VRCROSS )
M3L2805D
M3L2812D
M3L2815D
For Notes to Specifications, refer to page 5
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3
M3L-SERIES
Electrical Performance Characteristics
Parameter
Input current, no load ( IIN )
M3L2803R3S
M3L2805S
M3L2812S
M3L2815S
M3L2805D
M3L2812D
M3L2815D
Input current inhibited
Output ripple ( VRIP )
M3L2803R3S
M3L2805S
M3L2812S
M3L2815S
M3L2805D
M3L2812D
M3L2815D
Switching frequency ( FS )
Efficiency ( EFF )
M3L2803R3S
M3L2805S
M3L2812S
M3L2815S
M3L2805D
M3L2812D
M3L2815D
Enable Input ( Inhibit Function )
open circuit voltage
drive current ( sink )
voltage range
( 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 4 open
Min
Nom
Max
Unit
60
70
70
70
70
100
100
mA
1,2,3
Pin 4 shorted to pin 2
8.0
mA
1,2,3
VIN = 16, 28, 50 Volts
IOUT = 100% rated load
Notes 4, 6
35
50
70
80
80
80
80
mV p-p
575
KHz
1,2,3
Sync. Input (Pin 4) open
425
500
1,2,3
IOUT = 100% rated load
Note 4
68
75
75
75
75
75
75
75
79
80
81
79
79
80
1,2,3
Note 1
Current Limit Point
Expressed as a percentage
of full rated load current
1,2,3
Vout = 90% of Nominal, Note 4
Power dissipation, load fault (PD)
1,2,3
Short Circuit, Overload, Note 8
Output response to
step load changes (VTLD)
4,5,6
Half Load to/from Full Load, Notes 4,9
Recovery time,
step load changes (TTLD)
4,5,6
Half Load to/from Full Load, Note
4,9,10
Output response to
step line changes (VTLN)
4,5,6
16V to/from 50V
IOUT = 100% rated load, Notes 1,4,11
Recovery Time,
step line changes (TTLN)
4,5,6
16V to/from 50V
IOUT = 100% rated load, Notes
1,4,10,11
4,5,6
No Load, Full Load
Notes 4,12
Turn-on Response
Overshoot (VOS)
Turn-on Delay (TDLY)
Limits
%
-0.5
11.5
500
50
V
µA
V
105
130
%
14
W
300
mV pk
200
µs
300
mV pk
200
µs
500
10
mV
ms
9.5
-300
-300
2.0
For Notes to Specifications, refer to page 5
4
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M3L-SERIES
Electrical Performance Characteristics
Parameter
Capacitive Load (CL)
M3L2803R3S
M3L2805S
M3L2812S
M3L2815S
M3L2805D
M3L2812D
M3L2815D
Conditions
-55°C ≤ TC ≤ +85°C
VIN = 28V DC ± 5%, CL = 0
unless otherwise specified
Group A
Subgroup
1
( continued )
Limits
Min
Nom
IOUT = 100% rated load
No effect on DC performance
Notes 1, 4, 7
Each output on duals
Line Rejection
1
IOUT = 100% rated load
DC to 50KHz, Notes 1, 4
40
Isolation
1
Input to Output or Any Pin to Case
except pin 3, test @ 500VDC
100
Unit
2200
1000
180
120
500
90
60
µF
50
dB
MΩ
Device Weight
MTBF
Max
85
MIL-HDBK-217F2, SF, 35°C
1.5 x 10
6
g
Hr
Notes. Electrical Performance Characteristics
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)
12)
13)
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.
Output load current must be distributed such that at least 20% of the total load current is being provided by one of the outputs.
Load current split equally between outputs on dual output models.
Cross regulation is measured with 20% rated load on output under test while changing the load on the other output from 20% to 80%
of rated.
Guaranteed for a D.C. to 20MHz bandwidth. Tested using a 20KHz to 10MHz bandwidth using the circuit shown below.
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 VOUT = 90% of nominal.
Load step transition time ≤ 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 ≤ 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 (pin 4) to
the point where VOUT = 90% of nominal.
For operation at temperatures between +85°C and +125°C, derate the maximum output power linearly from 100% to 75%.
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5
M3L-SERIES
Circuit for Measuring Output Ripple Voltage
50 Ω
1 µF
50 Ω Coax
Oscilliscope or Equivalent
with 10 MHz Bandwidth.
Multiply readings by 2.
0.1 µF
+ Vout
50 Ω
Termination
DUT
Return
RL for IRATED
Radiation Performance Characteristics
Conditions
Min
Typ
Highest
Level
Tested
Total Ionizing Dose ( Gamma )
MIL-STD-883, Method 1019
Operating bias applied during exposure,
Full Rated Load, VIN = 28V
25
40
60
KRads
(Si)
Single Event Effects
SEU, SEL, SEGR, SEB
Heavy ions (LET)
Operating bias applied during exposure,
Full Rated Load, VIN = 28V
37
82
82
MeV•cm
/mg
Dose Rate ( Gamma Dot )
Temporary Saturation
Survival
MIL-STD-883, Method 1023
Operating bias applied during exposure,
Full Rated Load, VIN = 28V
1E8
1E10
1.5E9
Rads
(Si)/sec
Neutron Fluence
MIL-STD-883, Method 1017
3E12
8E12
Neutrons
2
/cm
Proton Fluence
E > 10MeV
TBD
N/A
protons
2
/cm
Test
Unit
2
International Rectifier currently does not have a DSCC certified Radiation Hardness Assurance Program.
6
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M3L-SERIES
Figure 1. Block Diagram - Single Output
Vin
1
INHIBIT
4
RETURN
2
CASE
GROUND
3
EMI
FILTER
+10.5V
7
+OUTPUT
6
OUTPUT
RETURN
5
OUTPUT
ADJUST
BIAS
SUPPLY
+
EA
-
RAMP
GEN.
PWM
CONTROLLER
SAMPLE
&
HOLD
FEEDBACK
TRIGGER
Figure 2. Block Diagram - Dual Output
Vin
1
EMI
FILTER
8
+OUTPUT
7
RETURN
6
-OUTPUT
5
OUTPUT
ADJUST
+10.5V
INHIBIT
4
RETURN
2
CASE
GROUND
3
BIAS
SUPPLY
+
EA
-
RAMP
GEN.
PWM
CONTROLLER
SAMPLE
&
HOLD
FEEDBACK
TRIGGER
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7
M3L-SERIES
Figure 3. Conducted Emissions, Common Mode
100
90
80
70
dB-uA
60
CEO3 LIMIT
50
40
30
20
10
0
1E3
1E4
1E5
Frequency ( Hz )
1E6
1E7
1E8
Figure 4. Conducted Emissions, Normal Mode
100
90
80
70
dB-uA
60
CEO3 LIMIT
50
40
30
20
10
0
1E3
8
1E4
1E5
Frequency ( Hz )
1E6
1E7
1E8
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M3L-SERIES
Figure 5. M3L2805S Line Rejection (CS01)
0
-10
-20
-30
dB
-40
-50
-60
-70
-80
-90
-100
1E2
1E3
Frequency ( Hz )
1E4
1E5
Figure 6. M3L2815D Line Rejection (CS01)
0
-10
-20
-30
dB
-40
-50
-60
-70
-80
-90
-100
1E2
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1E3
Frequency ( Hz )
1E4
1E5
9
M3L-SERIES
Figure 7. M3L2815D Line Rejections (CS01)
0
-10
-20
-30
dB
-40
-50
-60
-70
-80
-90
-100
1E2
10
1E3
Frequency ( Hz )
1E4
1E5
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M3L-SERIES
Mechanical outline
2.300
0.375
ø 0.128
4 Plcs
1.550
0.050
0.25 Typ.
0.270
8
0.470
1
0.400
7
0.400
1.000
Ref
1.500 1.750 2.000
3
6
4
5
2
2 Eq Spaces
@ 0.200
0.400
0.200
Pin ø
0.040
0.350
0.220
0.850
2.80
Ref
0.250
Tolerance: .XX = ±0.01
.XXX = ±0.005
0.425
Max
Pin Designation (Single/Dual)
Pin #
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Single
Dual
1
+ Input
+ Input
2
Input Return
Input Return
3
Case
Case
4
Inhibit
Inhibit
5
Output Adjust
Output Adjust
6
Output Return
- Vout
7
+ Vout
Output Return
8
NC
+ Vout
11
M3L-SERIES
Device Screening
Requirement
MIL-STD-883 Method
No Suffix
EM
-55°C to +85°C
-55°C to +85°C
Element Evaluation
MIL-PRF-38534
Class H w/SEM
N/A
Non-Destructive Bond Pull
2023
Yes
N/A
Temperature Range
Internal Visual
2017
Yes
c
Temperature Cycle
1010
Cond C
Cond C
Constant Acceleration
2001, Y1 Axis
3000 Gs
3000 Gs
PIND
2020
N/A
N/A
Burn-In
1015
160 hrs @ 125°C
48 hrs @ 125°C
Final Electrical
MIL-PRF-38534
-55°C, +25°C,
-55°C, +25°C,
( Group A )
& Specification
+85°C
+85°C
PDA
MIL-PRF-38534
N/A
N/A
Seal, Fine and Gross
1014
A1, C
Cond A
Radiographic
2012
N/A
N/A
External Visual
2009
Yes
c
Notes:
c
Best commercial practice.
International Rectifier currently does not have a DSCC certified Radiation Hardness Assurance Program.
Part Numbering
M3L 28 05 S /EM
Model
Input Voltage
Nominal
28 = 28V
Output Voltage
03R3 = 3.3V, 05 = 5V
12 = 12V, 15 = 15V
Screening Level
(Please refer to Screening Table)
No suffix, EM
Output
S = Single
D = Dual
WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 252-7105
IR SANTA CLARA: 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. 09/2006
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