MODELS
VDC O
UTPUT
B4-39
Size (max.): 2.720 x 1.350 x 0.505 inches (69.09 x 34.29 x 12.83 mm)
See Section B8, case J5, for dimensions.
Weight:
60 grams max.
Screening: Standard only. See Section C2 for screening description.
F
EATURES
40 to +85C operation
18 to 36 VDC input
(19 to 36 VDC input HR301-2805)
Fully Isolated
Optocoupler feedback
Fixed frequency, 240 to 300 kHz typical
Topology Push-Pull Forward
50 V for up to 50 ms transient protection
Inhibit function
Indefinite short circuit protection
Remote sense on HR301-2805 model
Up to 86% efficiency
SINGLE
5
12
15
DUAL
12
15
DESCRIPTION
HR300 SeriesTM DC/DC converters combine the small size and high
reliability of hybrid-based components, the high efficiency of
switching regulators, and the isolation, regulation, and low noise
characteristics of linear regulators.
S
MALL
S
IZE AND
R
ELIABILITY
HR300 DC/DC converters use thick-film hybrid manufacturing tech-
niques for smaller size, lighter weight and higher reliability than
converters produced with other circuit techniques. With a footprint of
less than 3.7 square inches and a 0.5 inch height, the HR300
converters reach power densities up to 22 watts per cubic inch.
The HR300 parts use the same manufacturing procedures and
quality controls that Interpoint applies to converters built for aero-
space and military applications. The converters are hermetically
sealed in metal packages that are guaranteed a maximum leak rate
of less than 10
-3
atm-cc/sec.
H
IGH
P
ERFORMANCE
HR300 converters use a constant frequency pulse-width modulated
switching regulator design operating in the forward mode with a
clock switching frequency of 240 to 300 kHz. Isolation is achieved
through the use of a transformer in the forward power circuit and an
optocoupler in the feedback control loop. The full load output power
of 30 watts is available over the entire 18 to 36 VDC input range (19
to 36 HR301-2805). On dual output models, up to 90% of full power
is available from either output up to a combined total of 30 watts.
The HR300's high efficiency is maintained over the entire input
voltage range and from approximately 25% of full load to full load
(see typical efficiency curves).
Short circuit protection is provided through foldback current limiting.
When the output current reaches approximately 125% of the full
rated load, the output voltage begins to reduce to protect the
converter. The converter can sustain a true short circuit condition
indefinitely. The HR300's flanged case facilitates removal of heat
and provides for mechanically secure mounting. If full power opera-
tion or indefinite short circuit protection is a system requirement, the
HR300 converter should be mounted with an efficient heat sink in
contact with the mounting flange.
Internal filters in all HR300 converters provide low noise on both
the input and outputs. On HR301 models, two-section
L-C filters limit output ripple voltage and reflected input ripple
current. On HR302 models, single-section L-C filters perform the
same function.
For maximum output regulation, the HR301-2805 is provided with
external output voltage remote sense pins. Connecting the remote
sense pins to the load provides a four-terminal voltage mode which
eliminates the adverse effects of line resistance voltage drops.
Remote sense pins may be left unconnected, but see cautions in
this data sheet. For normal operation, remote sense pins should be
connected to the respective output pins.
I
NHIBIT
F
UNCTION
An inhibit is provided to allow a logic input to shut down the
converter. An open circuit on the inhibit pin (pin 2 or 8) allows normal
operation. A connection between the inhibit pin and the input
common (pin 10) disables the internal oscillator, shutting down the
output. The inhibit pin has an open circuit voltage of 11 to 16 V on
single output models, 8 to 12 V on HR302-2812 and 10 to 14 V on
HR302-2815. In the inhibit mode, approximately 1 mA must be sunk
from the inhibit pin. An active low open collector is required to acti-
vate the inhibit function.
DC/DC C
ONVERTERS
28 V
OLT
I
NPUT
HR300 SERIES
30 WATT
TYPICAL CHARACTERISTICS
INHIBIT
RECOMMENDED OPERATING CONDITIONS
ABSOLUTE MAXIMUM RATINGS
Input Voltage
18 to 36 VDC (19 to 36 VDC HR301-2805)
Output Power
30 watts
Lead Soldering Temperature (10 sec per lead)
300C
Storage Temperature Range (Case)
55C to +125C
B4-40
HR300 SERIES
30 WATT
DC/DC C
ONVERTERS
Output Voltage Temperature Coefficient
100 ppm/C typical
Input to Output Capacitance
80 pF typical single output models
70 pF typical HR302-2812
60 pF typical HR302-2815
Current Limit
125% of full load, typical
Isolation
100 megohm minimum at 500 V
Conversion Frequency
240 to 300 kHz
Inhibit Pin Voltage (unit enabled)
11 to 16 V single output models
8 to 12 V HR302-2812
10 to 14 V HR302-2815
Input Voltage Range
18 to 36 VDC continuous
19 to 36 VDC HR301-2805
50 V for 50 msec transient
Case Operating Temperature (Tc)
40C to +85C full power
Inhibit TTL Open Collector
Logic low (output disabled)
Inhibit pin current 1 mA typical
Referenced to input common
Logic high (output enabled)
Open collector
Electrical Characteristics: 25C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
SINGLE OUTPUT MODELS
HR301-2805
HR301-2812
HR301-2815
PARAMETER
CONDITIONS
MIN TYP MAX
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
OUTPUT VOLTAGE
4.95
5.0
5.05
11.88
12
12.12
14.85
15
15.15
VDC
OUTPUT CURRENT
--
--
6.0
--
--
2.5
--
--
2.0
A
OUTPUT POWER
40C TO +85C
--
--
30.0
--
--
30.0
--
--
30.0
W
OUTPUT RIPPLE
BW
2 MHz
--
30
60
--
30
70
--
30
75
mV p-p
LINE REGULATION
1
MIN. TO MAX. V
IN
--
7
25
--
10
40
--
10
40
mV
LOAD REGULATION
2
NO LOAD TO FULL
--
5
25
--
10
40
--
10
40
mV
INPUT VOLTAGE
NO LOAD TO FULL
19
28
36
18
28
36
18
28
36
VDC
40C TO +85C
TRANSIENT 50 ms
--
--
50
--
--
50
--
--
50
INPUT CURRENT
NO LOAD
--
15
20
--
20
35
--
20
35
FULL LOAD
--
--
1370
--
--
1400
--
--
1400
mA
INHIBITED
--
--
15
--
--
22
--
--
22
INPUT RIPPLE
CURRENT
BW
2 MHz
--
5
15
--
10
25
--
10
25
mA p-p
EFFICIENCY
79
82
--
80
84
--
82
86
--
%
START-UP
DELAY
2
--
15
--
--
30
--
--
40
--
ms
OVERSHOOT
--
500
--
--
1200
--
--
1500
--
mV
Notes
1. For HR301-2805, with the remote sense pins connected to the load and no resistance between the output pins and load.
2. A low output impedance power source is required on the input to realize this start-up time. If less than full surge current is available, start-up time
will be longer
CAUTION
Permanent damage to the HR301-2805 will result if pin 6 is shorted to ground. Damage may also result if pin 4 or pin 5 is disconnected from the load
during operation with the remote sense leads connected to the load. If remote sense pins are not connected to the load, the output voltage of the
HR301-2805 will rise to approximately 6.2 VDC measured across pins 4 and 5.
PIN OUT
B4-41
HR300 SERIES
30 WATT
DC/DC C
ONVERTERS
TRIPLE OUTPUT MODELS
HR302-2812
HR302-2815
PARAMETER
CONDITION
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
OUTPUT VOLTAGE
+V
OUT
11.88
12.0
12.12
14.85
15.0
15.15
VDC
V
OUT
11.88
12.0
12.12
14.85
15.0
15.15
OUTPUT CURRENT
1
--
--
2.5
--
--
2.0
A
OUTPUT POWER
1
40C to +85C
--
--
30.0
--
--
30.0
W
OUTPUT RIPPLE
VOLTAGE BW
2 MHz
--
50
90
--
50
90
mV p-p
LINE REGULATION
V
IN
= 18 TO 36
--
10
30
--
10
40
mV
LOAD REGULATION
NO LOAD TO FULL
--
20
60
--
20
60
mV
CROSS REGULATION
2
+V
OUT
--
2.5
3.5
--
2.2
3.2
%
V
OUT
--
2.5
3.5
--
2.2
3.2
INPUT VOLTAGE
CONTINUOUS
18
28
36
18
28
36
VDC
40C to +85C
TRANSIENT 50 ms
--
--
50
--
--
50
INPUT CURRENT
NO LOAD
--
35
50
--
45
60
FULL LOAD
--
--
1350
--
--
1400
mA
INHIBITED
--
--
24
--
--
24
INPUT RIPPLE
CURRENT
BW
2 MHz
--
15
60
--
15
60
mA p-p
EFFICIENCY
80
84
--
81
85
--
%
START-UP
DELAY
3
--
60
--
--
60
--
ms
OVERSHOOT
--
1500
--
--
1500
--
mV
Electrical Characteristics: 25C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
Notes
1. Up to 90% of full power is available from either output providing the total power does not exceed 30 watts.
2. The effect on the output voltage of either output (held at 3 watts) when the other output is varied from 3 to 27 watts.
3. A low output impedance power source is required on the input to realize this start-up time. If less than full surge
current is available, start-up time will be longer
Pin
HR301-2805
Single Output
Dual Output
1
Positive Input
Positive Input
Positive Input
2
Inhibit
Inhibit
No connection
3
Sense Return
No connection
Positive Output
4
Output Common
Output Common
Output Common
5
Positive Output
Positive Output
Negative Output
6
Positive Sense
No connection
No connection
7
Case Ground
Case Ground
Case Ground
8
No connection
No connection
Inhibit
9
No connection
No connection
Input Common
10
Input Common
Input Common
Input Common
BOTTOM VIEW
HR300
Squared corner and dot on
top of cover indicate pin one.
10
9
8
7
6
1
2
3
4
5
F
IGURE
1: P
IN
O
UT
See Section B8, case J5, for dimensions.
HR30 2 - 28 12
Base Model
Input Voltage
Output Voltage
Number of Outputs
(1 = single, 2 = dual)
MODEL NUMBERING KEY
B4-42
HR300 SERIES
30 WATT
DC/DC C
ONVERTERS
Typical Performance Curves: 25C Tc
F
IGURE
5
F
IGURE
7
Output Power (Watts)
HR302-2815 Efficiency
Efficiency (%)
72
84
82
80
76
74
15
5
10
78
86
18 V
36 V
20
25
30
68
70
88
28 V
Output Power (Watts)
HR302-2812 and HR302-2815
Low Line Dropout
Inupt Voltage (Volts)
15
17
15
5
10
16
20
25
30
14
18
HR302-2815
HR302-2812
Output Power (Watts)
HR301-2805 Efficiency
Efficiency (%)
72
84
82
80
76
74
15
5
10
78
86
28 V
19 V
36 V
20
25
30
68
70
88
F
IGURE
2
Output Power (Watts)
HR301-2812 Efficiency
Efficiency (%)
72
84
82
80
76
74
15
5
10
78
86
28 V
18 V
36 V
20
25
30
68
70
88
F
IGURE
3
Output Power (Watts)
HR301-2812 and HR301-2815
Low Line Dropout
Input Voltage (Volts)
15
17
15
5
10
16
20
25
30
14
18
HR301-2815
HR301-2812
F
IGURE
6
F
IGURE
4
Output Power (Watts)
HR302-2812 Efficiency
Efficiency (%)
72
84
82
80
76
74
15
5
10
78
86
20
25
30
68
70
88
28 V
18 V
36 V
24421-009-DTS Rev A
DQ# 2009
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. HR300 Series is a trademark of Interpoint.
Copyright 1991 - 1999 Interpoint. All rights reserved.
B8-22
CASE J
C
ASES
Materials
Header Case J1
Cold Rolled Steel/Nickel/Gold
Cases J2 - J5
Cold Rolled Steel/Nickel/Tin
Cover Case
J1
Kovar/Nickel
Case J2 - J5
Cold Rolled Steel/Nickel/Tin
Pins
#52 alloy (all cases)
Case J1
MHV Series Triple compression glass seal
MTR Series Triple ceramic seal
Cases J2 - J5
compression glass 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
CASE J
BOTTOM VIEW
See Figures 36 - 40
for pin configuration
1.350 max
(34.29)
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.
Flange Thickness:
Cases J1 and J5
0.060 (1.52)
Case J2
0.073 (1.85) max
Cases J3 and J4
0.067 +0.005/-0.007 (1.70 +0.13/-0.8)
2.720 max
(69.09)
Dot on top of case indicates pin one
F
IGURE
35: C
ASE
J M
AXIMUM
D
IMENSIONS
Note: Although every effort has been made to render the case drawings at actual size, variations in the printing process may cause some distortion. Please refer
to the numerical dimensions for accuracy.
PDF 
ZIP