B4-33
HR700 SERIES
70 WATT
F
EATURES
40C to + 85C operation
19 to 40 VDC input
Fully Isolated
Optocoupler feedback
Fixed frequency, 245 kHz typical
Topology Push-Pull Forward
50 V for up to 50 ms transient protection
Inhibit/sync function
Indefinite short circuit protection
Remote sense on single models
Up to 84% efficiency
MODELS
VDC O
UTPUT
SINGLE
5
12
15
DUAL
12
15
TRIPLE
+5 & 12
+5 & 15
DC/DC C
ONVERTERS
28 V
OLT
I
NPUT
Size (max.): 3.20 x 2.46 x 0.595 inches
(81.3 x 62.5 x 15.11 mm)
See Section B8, case L, for dimensions.
Weight:
140 grams typical
Screening:
Standard only.
See Section B9 for screening description.
DESCRIPTION
HR700 Series DC/DC converters offer up to 70 watts of power from
single, dual, or triple outputs in one package. The converters
combine the small size and high reliability of hybrid-based compo-
nents, the high efficiency of switching regulators, and the isolation,
regulation, and low noise characteristics of linear regulators.
SMALL SIZE
The HR700 converters are manufactured using techniques that
provide very small size and low profile components. Each converter
uses less than eight square inches of board areas and is 0.595
inches high or less. The overall power density is 20 watts per cubic
inch.
HIGH RELIABILITY
Assembled using thick-film technology, the HR700 parts use the
same manufacturing procedures and quality controls that we apply
to converters designed for commercial airliners, the space shuttle,
advanced fighter aircraft, and other high reliability applications. The
steel cases are hermetically sealed in a dry nitrogen environment
and are guaranteed a maximum leak rate of less than 10
-3
atm-
cc/sec. All devices are 100% electrically tested.
HIGH PERFORMANCE
The HR700 series parts are high efficiency, low noise, pulse-width
modulated converters which use a quasi-square wave forward
converter design with a nominal switching frequency of 245 kHz.
Isolation between input an output is provided with a transformer in
the forward power loop and a wide band, temperature insensitive,
optical link in the feedback control loop. Short circuit protection is
provided by detecting peak primary switching current on a cycle
basis and limiting it to approximately 130% of the full load input
current. This method results in quick and positive current limiting
under short circuit conditions.
HR700 Series DC/DC converters are designed to provide full power
operation over the input voltage range of 19 to 40 VDC. Operation
below an input of 19 volts is possible with derated output power.
Outputs are available as 5, 12, and 15 VDC single, dual and triple
outputs. The converters typically provide greater than 80% effi-
ciency over the entire input range. Line regulation is typically within
0.1% and load regulation within 0.2%.
LOW NOISE
The HR700 Series converters offer low noise on both the input and
output lines. A two section, four pole, LC input filter is included to
provide very low reflected line ripple current. Output ripple is main-
tained at less than 50 mV p-p for single and dual models and 85 mV
p-p for triple output models.
INHIBIT
/
SYNC FEATURE
An inhibit/sync pin is standard on all models of the HR700 Series
converters. The pin serves as both an output inhibit and as a
synchronization input. In the inhibit mode an open collector TTL
compatible low (<0.8 V) will disable internal switching thereby
inhibiting the unit's output. Inhibiting in this manner results in an
extremely low quiescent current.
SYNC AND INHIBIT
B4-34
HR700 SERIES
70 WATT
DC/DC C
ONVERTERS
DERATING OUTPUT POWER/CURRENT AND INPUT VOLTAGE
RECOMMENDED OPERATING CONDITIONS
ABSOLUTE MAXIMUM RATINGS
TYPICAL CHARACTERISTICS
SINGLE OUTPUTS
HR701-2805
HR701-2812
HR701-2815
PARAMETER
CONDITION
MIN
TYP
MAX
MIN
TYP MAX
MIN.
TYP
MAX
UNITS
OUTPUT
FULL LOAD
4.90
5.00
5.10
11.75 12.00 12.25
14.75 15.00 15.25
VDC
VOLTAGE
OUTPUT
V
IN
= 19 TO 40
--
--
12.00
--
--
5.83
--
--
4.67
A
CURRENT
OUTPUT
Tc = 55C TO +85C
--
--
60
--
--
70
--
--
70
W
POWER
OUTPUT
FULL LOAD BW
2 MHz
--
30
100
--
30
100
--
30
100
mV p-p
RIPPLE
LINE
V
IN
= 19 TO 40
--
10
30
--
10
30
--
10
30
mV
REGULATION
LOAD
NO LOAD TO FULL
--
10
30
--
10
30
--
10
30
mV
REGULATION
INPUT
VOLTAGE
19
28
40
19
28
40
19
28
40
VDC
INPUT
NO LOAD
--
75
100
--
70
100
--
70
100
mA
CURRENT
INHIBITED
--
30
35
--
30
35
--
30
35
INPUT REFL.
FULL LOAD
--
10
50
--
10
50
--
10
50
mA p-p
RIPPLE
BW
10 MHz
EFFICIENCY
77
80
--
80
83
--
80
83
--
%
STARTUP
WITH LOW
--
5
10
--
8
10
--
8
10
ms
DELAY
IMPEDANCE SOURCE
Output Power
60 to 70 watts depending on model
Lead Soldering Temperature (10 sec per lead)
300C
Storage Temperature Range (Case)
55C to +125C
Output Voltage Temperature Coefficient
150 ppm/C, typical
Input to Output Capacitance
160 pF, typical
Isolation
100 megohm minimum at 500 V
Conversion Frequency
Free run mode 245 kHz, typical
Inhibit Pin Voltage (unit enabled)
4.5 to 5.5 V
Sync In (245 to 370 kHz.)
Duty cycle 70% min, 98% max.
Logic low 0.8V max
Logic high 4.5 V min
Referenced to input common
If sync is not used, leave unconnected
Inhibit TTL Open Collector
Logic low (output disabled)
Inhibit pin current 1 mA max
Referenced to input common
Logic high (output enabled)
V =
4.5V
Temperatures are referenced to the temperature at the converter's baseplate
Linearly derate output power/current from 100% at 85C to 0% at 125C.
Above 105C linearly derate steady state input voltage to 33 volts at 125C.
Indefinite short circuit protection is not guaranteed above 85C case.
Operation below an input voltage of 19 volts, including operation in MIL-
STD-704E emergency power conditions, is possible with derated output
power. See Figures 10 and 11.
Electrical Characteristics: 25C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
Input Voltage Range
19 to 40 VDC continuous (see Derating)
Case Operating Temperature (Tc)
40C to +85C full power
B4-35
HR700 SERIES
70 WATT
DC/DC C
ONVERTERS
DUAL AND TRIPLE OUTPUTS
HR702-2812
HR702-2815
HR703-28512
HR703-28515
PARAMETER
CONDITION
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
OUTPUT
FULL
MAIN
--
--
--
--
--
--
4.90
5.05
5.15
4.90
4.95
5.10
VOLTAGE
LOAD
DUAL
11.75 12.00 12.25
14.75 15.00 15.25 11.50
11.80 12.10 15.05 15.30 15.75
VDC
OUTPUT
V
IN
=
MAIN
--
--
--
--
--
--
--
4.0
10.0
--
4.0
10.0
A
CURRENT
1, 2
19 TO 40
DUAL
--
2.92
5.5
--
2.33
4.4
--
1.67
4.2
--
1.33
3.33
OUTPUT
MAIN
--
--
--
--
--
--
--
20
50
--
20
50
POWER
1, 2
DUAL
--
35
66.5
--
35
66.5
--
20
50
--
20
50
W
TOTAL
--
--
70
--
--
70
--
--
60
--
--
60
OUTPUT
FULL LOAD
MAIN
--
--
--
--
--
--
--
50
100
--
50
100
mV p-p
RIPPLE
BW
2 MHz
DUAL
--
30
100
--
30
100
--
50
100
--
50
100
LINE
V
IN
=
MAIN
--
--
--
--
--
--
--
2
25
--
2
25
mV
REGULATION 19 TO 40
DUAL
--
10
30
--
10
30
--
100
225
--
100
225
LOAD
3
NO LOAD
MAIN
--
--
--
--
--
--
--
5
30
--
5
30
mV
REGULATION TO FULL
DUAL
--
25
50
--
25
50
--
480
750
--
300
600
CROSS
4
DUAL
REGULATION +P
O
= 3 W TO 35 W
P
O
= 35 W
--
1.5
3.0
--
1.5
3.0
--
--
--
--
--
--
+P
O
= 20 W TO 50 W
%
%
P
O
= 50 W TO 20 W
--
2.0
4.0
--
2.0
3.5
--
--
--
--
--
--
CROSS
5
MAIN +P
O
= 30 W
REGULATION DUAL
+P
O
= 3 W TO 27 W
--
--
--
--
--
--
--
2.3
6.0
--
2.3
5.0
P
O
= 27 W TO 3 W
MAIN
%
+P
O
= 3 W TO 30 W
DUAL P
O
= 15 W
--
--
--
--
--
--
--
5.4
9.0
--
5.0
7.0
INPUT
VOLTAGE
19
28
40
19
28
40
19
28
40
19
28
40
VDC
INPUT
NO LOAD
--
75
100
--
75
100
--
85
115
--
60
115
mA
CURRENT
INHIBITED
--
25
35
--
25
35
--
30
35
--
30
35
INPUT REFL.
FULL LOAD
--
15
50
--
15
50
--
15
50
--
15
50
mA p-p
RIPPLE
BW
10 MHz
EFFICIENCY
80
83
--
80
83
--
79
84
--
79
84
--
%
STARTUP
--
15
25
--
15
25
--
6
10
--
6
10
ms
DELAY
Electrical Characteristics: 25C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
Notes
1. On dual output models the maximum combined output power is 70 watts.
A maximum of 95% (66.5 W) is available from any single output.
2. On triple output models the maximum combined output power is 60 watts.
A maximum of 50 watts is available from a single output.
3. Balanced loads
4. Regulation effect on the negative dual output during the defined conditions.
5. Regulation effect on both dual outputs during the defined conditions.
B4-36
HR700 SERIES
70 WATT
DC/DC C
ONVERTERS
C
ALCULATING
M
AXIMUM
A
MBIENT
T
EMPERATURE
The HR700 Series of DC/DC converters has an upper operating
temperature of + 85C at the baseplate of the case. The degree of
heat sinking required to remain within this limit may be determined
from Figure 1 which shows the maximum allowed internal power
dissipation (P
DISS
vs. ambient temperature for various heat sink
thermal resistances. P
DISS
may be calculated as:
P
DISS
= P
OUT
/ efficiency P
OUT
The efficiency for all combinations of P
OUT
and V
IN
for the various
models may be obtained from the graphs on the preceding pages.
Example:
Converter = HR702-2815, T
AMB
= 70C,
V
IN
= 28 VDC, P
OUT
= 45 watts
Efficiency = 85% (From Figure 7)
P
DISS
= (45 / 85) 45 = 7.95 watts
From Figure 1 we can see that this situation will require thermal
resistance of approximately 4.5C / watt.
Conversely we may also find the maximum ambient temperature
which can be tolerated if we know the heat sink thermal resistance.
Example:
Converter = HR701-2805, V
IN
= 28 VDC, P
OUT
= 45 W.
Thermal Resistance = 3C / watt.
Efficiency = 83.5% (From Figure 3)
P
DISS
= (45 / 0.835) 45 = 8.89 watts.
From Figure 1 we can see that the maximum allowed ambient
temperature is approximately 75C.
H
EAT
S
INK
R
ECOMMENDATIONS
An HR700 Series converter in still air (other than convective
currents) and with no conductive cooling paths other than through
electrical connections at the pins will exhibit a thermal resistance of
approximately 4C / watt. In cases where this value proves to be too
high it is recommended that additional heat sinking be supplied. The
simplest method of accomplishing this is to firmly attach the
converter to a PCB thereby providing a conductive thermal path.
Secondly it is recommended that airflow be provided over the
converter. Although each situation requires a thorough thermal
analysis these two measures can reduce the thermal resistance to
as low as 2C / watt. If calculations indicate further heat sinking is
required it is recommended that additional thermal mass be
provided either under the base plate or on top of the converter's
mounting flanges or both.
THERMAL MANAGEMENT
Degrees Centigrade
Watts
20
40
60
80
100
120
140
20
15
10
5
U=4
C/W
U=3
C/W
U=2
C/W
U=0
C/W
Internal Power Dissipation (max)
vs. Ambient Temperature
F
IGURE
1
B4-37
HR700 SERIES
70 WATT
DC/DC C
ONVERTERS
PIN OUT
Pin
Single Output
Dual Output
Triple Output
1
Positive Input
Positive Input
Positive Input
2
Case Ground
Case Ground
Case Ground
3
Input Common
Input Common
Input Common
4
Inhibit/Sync In
Inhibit/Sync In
Inhibit/Sync In
5
Negative Sense
Negative Output
Negative Aux. Output
6
Positive Sense
Positive Output
Positive Aux. Output
7, 8
Output Common
Output Common
Output Common
9, 10
Positive Output
No Connection
Main (+5) Output
Squared corner indicates pin one.
BOTTOM VIEW
HR700
1
2
3
4
5
6
7
8
9
10
F
IGURE
2: P
IN
O
UT
MODEL NUMBERING KEY
HR70 2 - 28 12
Base Model
Input Voltage
Output Voltage
Number of Outputs
(1 = single, 2 = dual, 3 = triple)
(Main and aux. Vout for triple models)
See Section B8, case L, for dimensions.
B4-38
HR700 SERIES
70 WATT
DC/DC C
ONVERTERS
Typical Performance Curves: 25C Tc , 28 VDC Vin, 100% load, free run, unless otherwise specified.
F
IGURE
6
F
IGURE
8
OUTPUT POWER (WATTS)
HR702-2812
EFFICIENCY VS. LINE & LOAD
EFFICIENCY (%)
10
20
30
40
50
60
70
87
85
83
81
79
77
75
73
71
40 V
28 V
19 V
OUTPUT POWER (WATTS)
HR703-28512
EFFICIENCY VS. LINE & LOAD
EFFICIENCY (%)
10
20
30
40
50
60
70
87
85
83
81
79
77
75
73
71
40 V
28 V
19 V
OUTPUT POWER (WATTS)
HR701-2805
EFFICIENCY VS. LINE & LOAD
EFFICIENCY (%)
10
20
30
40
50
60
70
86
85
84
83
82
81
80
79
78
40 V
28 V
20 V
F
IGURE
3
OUTPUT POWER (WATTS)
HR701-2812
EFFICIENCY VS. LINE & LOAD
EFFICIENCY (%)
10
20
30
40
50
60
70
89
88
87
86
85
84
83
82
81
40 V
28 V
19 V
F
IGURE
4
OUTPUT POWER (WATTS)
HR702-2815
EFFICIENCY VS. LINE & LOAD
EFFICIENCY (%)
10
20
30
40
50
60
70
87
85
83
81
79
77
75
73
71
40 V
28 V
19 V
F
IGURE
7
F
IGURE
5
OUTPUT POWER (WATTS)
HR701-2815
EFFICIENCY VS. LINE & LOAD
EFFICIENCY (%)
10
20
30
40
50
60
70
89
88
87
86
85
84
83
82
81
40 V
28 V
19 V
OUTPUT POWER (WATTS)
HR703-28515
EFFICIENCY VS. LINE & LOAD
EFFICIENCY (%)
10
20
30
40
50
60
70
87
85
83
81
79
77
75
73
71
40 V
28 V
19 V
F
IGURE
9
OUTPUT POWER (WATTS)
LOW LINE DROPOUT VS
LOAD (50mV DROP)
INPUT VOLTAGE (VOLTS)
15
10
20
30
40
50
60
70
16
17
18
HR701-2815
HR701-2812
HR701-2815
F
IGURE
10
F
IGURE
11
OUTPUT POWER (WATTS)
LOW LINE DROPOUT VS LOAD
(50mV DROP)
INPUT VOLTAGE (VOLTS)
15
10
20
30
40
50
60
70
16
17
18
19
HR702-2815
HR702-2812
HR703-28512
HR703-28515
20621-009-DTS Rev A
DQ# 2008
All technical information is believed to be accurate, but no responsibility is assumed
for errors or omissions. Interpoint reserves the right to make changes in products
or specifications without notice. HR700 Series is a trademark of Interpoint.
Copyright 1992 - 1999 Interpoint. All rights reserved.
B8-31
CASE L
C
ASES
0.060 min
(1.52)
0.060 min
(1.52)
0.337 min
(8.56)
0.337 min
(8.56)
3.20 max (81.3)
2.46 max (62.5)
Materials
Header Cold Rolled Steel/Nickel/Tin
Cover
Cold Rolled Steel/Nickel/Tin
Pins
#52 alloy pins 1-4, and 9-10
#52 alloy with copper core pins 5-8
ceramic seal
Case dimensions in inches (mm)
Tolerance
0.005 (0.13) for three decimal places
0.01 (0.2) for two decimal places
unless otherwise specified
CAUTION
Heat from reflow or wave soldering may damage
the device. Solder pins individually with heat
application not exceeding 300
C for 10 seconds
per pin.
Squared corner indicates pin one
CASE L
TOP VIEW
Cover Placement
and
Min/Max Dimensions
See Figure 50
for pin configuration
F
IGURE
49: C
ASE
L M
AXIMUM
D
IMENSIONS
B8-32
CASE L
C
ASES
Solder Seal
Solder Tip-off
2.850 (72.39)
0.550 (13.97)
1.600 (40.64)
0.350 (8.89)
0.000
0.00
0.000
0.180 (4.57)
0.040 +0.007/-0.000
(1.02 +0.18/-0.00)
0.595 max
(15.11)
0.250 +0.05/-0.00
(6.35 +1.3/-0.0)
0.625 (15.88)
0.825 (20.96)
1.025 (26.04)
1.325 (33.66)
1.425 (36.20)
1.625 (41.28)
2.280 (57.91)
.0.040 +0.005/-0.002
(1.02 +0.13/-0.05)
BOTTOM VIEW
1
2
3
4
5
6
7
8
9
10
Squared corner indicates pin one
MFW Series: Screening Standard or ES
HR700 Series: no screening options
CASE L
0.141 x 6
(3.58)
F
IGURE
50: C
ASE
L D
IMENSIONS
C2-13
QA SCREENING
HR PRODUCTS
HR P
RODUCTS
TEST (HR products)
STANDARD
PRE-CAP INSPECTION
Method 2017
yes
FINAL ELECTRICAL TEST MIL-PRF-38534, Group A
Subgroups 1 and 4: +25C case
yes
HERMETICITY TESTING
Gross Leak, Dip (1 x 10
-3
)
yes
FINAL VISUAL INSPECTION
Method 2009
yes
Test methods are referenced to MIL-STD-883 as determined by MIL-
PRF-38534.
HR700 Series
HR300 Series
HR150 Series
HR120 Series
HR40 Series
Applies to the following products:
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