F
EATURES
• –40° to +85°C 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
DC/DC C
ONVERTERS
28 V
OLT
I
NPUT
HR300 SERIES
30 WATT
MODELS
VDC O
UTPUT
SINGLE
5
12
15
DUAL
±12
±15
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.
DESCRIPTION
HR300 Series™ 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.
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.
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).
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.
B4-39
HR300 SERIES
30 WATT
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)
• 300°C
Storage Temperature Range (Case)
• –55°C to +125°C
DC/DC C
ONVERTERS
INHIBIT
Inhibit TTL Open Collector
• Logic low (output disabled)
Inhibit pin current 1 mA typical
• Referenced to input common
• Logic high (output enabled)
Open collector
TYPICAL CHARACTERISTICS
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
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 18 to 36 VDC continuous
19 to 36 VDC HR301-2805
• 50 V for 50 msec transient
Case Operating Temperature (Tc)
• –40°C to +85°C full power
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
SINGLE OUTPUT MODELS
PARAMETER
OUTPUT VOLTAGE
OUTPUT CURRENT
OUTPUT POWER
OUTPUT RIPPLE
LINE REGULATION
1
LOAD REGULATION
2
INPUT VOLTAGE
–40°C TO +85°C
INPUT CURRENT
–40°C TO +85°C
BW
≤
2 MHz
MIN. TO MAX. V
IN
NO LOAD TO FULL
NO LOAD TO FULL
TRANSIENT 50 ms
NO LOAD
FULL LOAD
INHIBITED
INPUT RIPPLE
CURRENT
EFFICIENCY
START-UP
DELAY
2
OVERSHOOT
BW
≤
2 MHz
—
79
—
—
5
82
15
500
15
—
—
—
—
80
—
—
10
84
30
1200
25
—
—
—
—
82
—
—
10
86
40
1500
25
—
—
—
mA p-p
%
ms
mV
CONDITIONS
HR301-2805
MIN
4.95
—
—
—
—
—
19
—
—
—
—
TYP
5.0
—
—
30
7
5
28
—
15
—
—
MAX
5.05
6.0
30.0
60
25
25
36
50
20
1370
15
HR301-2812
MIN
11.88
—
—
—
—
—
18
—
—
—
—
TYP
12
—
—
30
10
10
28
—
20
—
—
MAX
12.12
2.5
30.0
70
40
40
36
50
35
1400
22
MIN
14.85
—
—
—
—
—
18
—
—
—
—
HR301-2815
TYP
15
—
—
30
10
10
28
—
20
—
—
MAX
15.15
2.0
30.0
75
40
40
36
50
35
1400
22
mA
UNITS
VDC
A
W
mV p-p
mV
mV
VDC
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.
B4-40
CASE J
C
ASES
Dot on top of case indicates pin one
CASE J
BOTTOM VIEW
See Figures 36 - 40
for pin configuration
1.350 max
(34.29)
2.720 max
(69.09)
Flange Thickness:
Cases J1 and J5
Case J2
Cases J3 and J4
0.060 (1.52)
0.073 (1.85) max
0.067 +0.005/-0.007 (1.70 +0.13/-0.8)
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
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.
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.
B8-22
嵌入式系统
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