PD-97440C
GH-SERIES
HIGH RELIABILITY, HIGH EFFICIENCY
RADIATION HARDENED
DC-DC CONVERTER
Description
The GH series is a family of low voltage single output
DC-DC converters. They are specifically designed in
response to the need for low voltage at moderate current
levels with the high efficiency and tight regulation
dictated by modern digital processing applications. The
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 de-rated to meet the requirements
of MIL-STD-975, MIL-STD-1547 except for the CDR type
of capacitors, a capacitor with 50V rating is used for in-
circuit voltage stress of less than10V. Thorough analyses
and documentation including beginning-of-life (BOL)
and end-of-life (EOL) electrical worst case (WCA)
operation, component stress and de-rating, radiation
susceptibility (TREE), thermal stress, failure mode and
effects (FMEA), and reliability (MTBF) are available for
customer review.
The design incorporates a fixed frequency topology
with magnetic feedback. Synchronous rectification is
deployed to maximize efficiency performance. The
converters include an internal EMI filter that is capable
of meeting the conducted emission requirements of
most major satellite power busses. Incorporation of
many functional features including on/off command,
remote sensing, and under-voltage lockout make the
design suitable for today’s space design applications.
The converter is enclosed in a hermetically sealed
package with the overall dimensions of 3.5"L x 2.50”W
x 0.475"H including the I/O pins and mounting tabs.
The package base material is silicon carbide-
aluminum (AISIC). The package ring frame is Alloy
48. The package utilizes rugged ceramic feed-through
copper core I/O pins and is sealed using parallel
seam welding. The total mass of a converter is less
than 110 grams.
28V Input, Single Output
GH
Features
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Total Ionizing Dose (TID) > 100 KRad(Si)
SEE Hardened to LET Level > 82 MeV
.
cm
2
/mg
Internal EMI filter
Low Weight, < 110 grams
Magnetically Coupled Feedback
18V to 40V DC Input Range
Up to 50W Output Power
Single Output Models Include
1V, 1.5V, 1.8V, 2.5V, 3.3V and 5V
High Efficiency - to 87%
-55°C to +85°C Operating Temperature Range
100M
Ω
@ 100VDC Isolation
Under-Voltage Lockout
Short Circuit and Overload Protection
Output Voltage Adjust
Synchronization Output and Input
Remote Sense
External Inhibit
Applications
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Deep Space Satellites / Probes
Strategic Weapons and Communication System
Geostationary Earth Orbit Satellites (GEO)
Manufactured in a facility fully qualified to MIL-
PRF-38534, 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 GH-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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1
10/12/12
GH-SERIES
(28V Input, Single Output)
Specifications
Absolute Maximum Ratings
Input voltage range
Output power
Lead temperature
Operating temperature
Storage temperature
-0.5Vdc to +50Vdc
Internally limited
+300°C for 10 seconds
-55°C to +125°C
-55°C to +135°C
Recommended Operating Conditions
Input voltage range
Output power
Operating temperature
Operating temperature
1
1
+18Vdc to +40Vdc
0 to Max. Rated
-55°C to +85°C
-55°C to +80°C
Meets derating per MIL-STD-975
Electrical Performance Characteristics
Parameter
Group A
Subgroup
Conditions
-55°C
≤
T
C
≤
+85°C
V
IN
= 28V DC ± 5%, C
L
= 0
unless otherwise specified
Limits
Unit
Min
18
1
1
1
1
1
1
2,3
2,3
2,3
2,3
2,3
2,3
Note 3
0.98
1.48
1.77
2.47
3.28
4.98
0.96
1.45
1.75
2.45
3.24
4.93
Nom
28
1.00
1.50
1.80
2.50
3.30
5.00
Max
40
Note 3
1.02
1.52
1.83
2.53
3.32
5.02
1.04
1.55
1.85
2.55
3.36
5.07
V
V
Input Voltage
Output Voltage (Vout)
GH2801S
GH2801R5S
GH2801R8S
GH2802R5S
GH2803R3S
GH2805S
GH2801S
GH2801R5S
GH2801R8S
GH2802R5S
GH2803R3S
GH2805S
Output power (P
OUT
)
GH2801S
GH2801R5S
GH2801R8S
GH2802R5S
GH2803R3S
GH2805S
Output current (I
OUT
)
GH2801S
GH2801R5S
GH2801R8S
GH2802R5S
GH2803R3S
GH2805S
Line regulation (VR
LINE
)
Load regulation (VR
LOAD
)
Input current (I
IN
)
I
OUT
= 100% rated load
V
IN
= 18, 28, 40 Volts, Note 2
1,2,3
0
0
0
0
0
0
0
0
0
0
0
0
-10
-0.5
130
2.0
20
30
36
50
50
50
20
20
20
20
15.15
10
10
0.5
200
5.0
W
V
IN
= 18, 28, 40 Volts, Note 2
1,2,3
A
1,2,3
1,2,3
1,2,3
V
IN
= 18, 28, 40 Volts
I
OUT
= 0, 50%, 100% rated
I
OUT
= 0, 50%, 100% rated
V
IN
= 18, 28, 40 Volts
I
OUT
= 0, Pin 3 open
Pin 3 shorted to pin 2
mV
%
mA
For Notes to Electrical Performance Characteristics, refer to page 4
2
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GH-SERIES
(28V Input, Single Output)
Electrical Performance Characteristics
Parameter
Group A
Subgroup
1,2,3
( continued )
Limits
Unit
Min
450
450
4.0
-0.5
80
20
5
5
5
10
10
10
70
72
75
81
83
85
3.0
-0.5
73
75
78
84
85
87
5.0
100
50
125
17
135
25
Nom
500
Max
550
600
10.0
0.5
80
15
15
15
25
25
30
KHz
KHz
V
V
V/µs
%
Conditions
-55°C
≤
T
C
≤
+85°C
V
IN
= 28V DC ± 5%, C
L
= 0
unless otherwise specified
Sync. Input (Pin 4) open
Ext. Clock on Sync. Input (Pin 4)
Note 1
Switching frequency (F
S
)
Synchronization Input
frequency range
pulse high level
pulse low level
pulse transition time
pulse duty cycle
Output ripple (V
RIP
)
GH2801S
GH2801R5S
GH2801R8S
GH2802R5S
GH2803R3S
GH2805S
Efficiency (E
FF
)
GH2801S
GH2801R5S
GH2801R8S
GH2802R5S
GH2803R3S
GH2805S
Inhibit Input
open circuit voltage
drive current (sink)
voltage range
Current Limit Point
Expressed as a percentage
of full rated load current
Power dissipation, load fault (P
D
)
Output response to
step load changes (V
TLD
)
GH2801S
GH2801R5S
GH2801R8S
GH2802R5S
GH2803R3S
GH2805S
Recovery time,
step load changes (T
TLD
)
GH2801S
GH2801R5S
GH2801R8S
GH2802R5S
GH2803R3S
GH2805S
Output response to
step line changes (V
TLN
)
Recovery time,
step line changes (T
TLN
)
Turn-on Response
Overshoot (V
OSH
)
Turn-on Delay (T
DLY
)
I
OUT
= 100% rated load
Note 4
1,2,3
mV p-p
I
OUT
= 100% rated load
1
%
1,2,3
Note 1
V
µA
V
%
W
1,2,3
V
out
= 90% of Nominal
1,2,3
Short Circuit, Overload, Note 6
Half Load to/from Full Load, Note 7
-300
-300
-300
-300
-300
-300
Half Load to/from Full Load, Notes 7, 8
250
250
250
250
250
250
24V to/from 32V
I
OUT
= 100% rated load, Notes 1, 9
24V to/from 32V
I
OUT
= 100% rated load, Notes 1, 8, 9
No Load, Full Load
Note 10
-50
50
200
250
5.0
300
300
300
300
300
300
mV pk
4,5,6
4,5,6
µs
4,5,6
4,5,6
4,5,6
mV pk
µs
mV
ms
0
For Notes to Electrical Performance Characteristics, refer to page 4
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3
GH-SERIES
(28V Input, Single Output)
Electrical Performance Characteristics
Parameter
Group A
Subgroup
( continued )
Limits
Unit
Min
Nom
Max
5000
µF
Conditions
-55°C
≤
T
C
≤
+85°C
V
IN
= 28V DC ± 5%, C
L
= 0
unless otherwise specified
I
OUT
= 100% rated load
No effect on DC performance
Notes 1, 5
I
OUT
= 100% rated load
DC to 50KHz, Note 1
I
OUT
= 100% rated load, Note 1
Input to Output or Any Pin to Case
except pin 13, test @ 100VDC
MIL-HDBK-217F2, SF, 35°C,
Note 11
Capacitive Load (C
L
)
Line Rejection
Electromagnetic Interference
(EMI), conducted emission (C
E
)
Isolation
Device Mass
MTBF
1
1
1
1
40
60
Per Fig. 3
dB
100
110
5.8x10
6
MΩ
g
Hrs
Notes for the Electrical Performance Characteristics Table
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. These are beginning-of-life (BOL) limits. End-of-life (EOL) limits are -3% and +3% of nominal limit for Min and
Max, respectively.
4. Guaranteed for a D.C. to 20MHz bandwidth. Tested using a 20KHz to 10MHz bandwidth.
5. 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.
6. Overload power dissipation is defined as the device power dissipation with the load set such that V
OUT
= 90% of
nominal.
7. Load step slew rate
≤
0.5A/µs.
8. Recovery time is measured from the initiation of the transient to where V
OUT
has returned to within ±1% of its
steady state value.
9. Line step slew rate
≤1.0V/µs.
10. 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 V
OUT
= 90% of nominal.
11. MIL-HDBK MOSFET failure rates replaced by empirical failure rate data supplied by International Rectifier.
1.
Radiation Performance Characteristics
Test
Total Ionizing Dose (Gamma)
Conditions
MIL-PRF-883, Method 1019.5
Operating bias applied during exposure,
Half Rated Load, V
IN
= 28V
Heavy Ions (LET)
Min
Typ
Unit
100
Krads(Si)
Single Event Effects
SEU, SEL, SEGR, SEB
Operating bias applied during exposure,
Half Rated Load, V
IN
= 18V, 28V & 50V
Test lab: Cyclotron Institute,
Texas A & M University
82
MeV
x
cm /mg
2
International Rectifier currently does not have a DLA Land and Maritime certified Radiation Hardness
Assurance Program.
4
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GH-SERIES
(28V Input, Single Output)
Fig. 1 –Typical Efficiency vs Output Curent @ 25°C, 5V Output (GH2805S)
90
85
80
Efficiency, %
75
70
65
60
55
50
45
40
Efficiency vs. Output Current at 25ºC, 5V
Output (GH2805S)
18V Vin
28V Vin
40V Vin
0
2
4
6
8
10
Output Current, A
Fig. 2 –Typical Efficiency vs Temperature, 5V Output (GH2805S)
Efficiency vs. Temperature, 5V Output
(GH2805S)
90
85
80
Efficiency, %
75
70
65
60
55
50
0
2
4
6
8
10
Output Current, A
-55ºC
25ºC
85ºC
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