F
EATURES
• –40°C to +85°C operation
• 16 to 40 VDC input
(19 to 40 VDC input for
15 volt output models)
• Fully Isolated
• Optocoupler feedback
• 600 kHz typical operating frequency
• Topology – Single Ended Forward
• 50 V for up to 50 ms transient protection
• Inhibit function
• Indefinite short circuit protection
• Up to 83% efficiency
DC/DC C
ONVERTERS
28 V
OLT
I
NPUT
HR120 SERIES
12 WATT
MODELS
VDC O
UTPUT
SINGLE
5
12
15
DUAL
±12
±15
Size (max.): 1.460 x 1.130 x 0.330 inches (37.08 x 28.70 x 8.38 mm)
See Section B8, case E1 for dimensions.
Weight:
21 grams typical.
Screening: Standard only. See Section C2 for screening description.
DESCRIPTION
The HR120 Series™ of DC/DC converters offers up to 12 watts of
power from single or dual outputs in a single package over a –40°C
to +85°C temperature range. Thick film hybrid manufacturing tech-
nology produces high levels of miniaturization, giving the HR120
Series converters a low profile (0.330 inch), small board area (1.65
square inches), and high power density (22 watt/in
3
).
The parts are packaged in sealed steel enclosures, making them
ideal for use in high reliability applications. Each unit is guaranteed
to pass a hermeticity test with a maximum leak rate of 0.001 atm-
cc/sec.
Indefinite short circuit protection and overload protection are
provided by sensing output load current and restricting the output
current to approximately 125% of full load output current. Since the
output current is sensed in the secondary stage, the result is a
predictable, constant output current control with no foldback char-
acteristics. HR120 converters are provided with internal filtering
elements on both the input and output to help reduce the need for
external components.
W
IDE
V
OLTAGE
R
ANGE
The 5 and 12 volt output models provide full power operation over
the input voltage range of 16 to 40 volts (19 to 40 volts for 15 volt
output models). Operation below 16 volts (or below 19 volts for the
15 volt output models), including operation in MIL-STD-704E emer-
gency power conditions, is possible with derated output power.
Please refer to the low voltage drop-out graphs, Figures 9 and 10.
The HR120 Series provides full power operation at case tempera-
tures from –40°C up to +85°C. Depending on operating levels, air
flow, and ambient temperature, heat sinking may be required.
D
ESIGN
M
ETHODOLOGY
The HR120 converters are switching regulators which use a quasi-
square wave, single ended forward converter design with a nominal
switching frequency of 600 kHz. Isolation between input and output
circuits is provided with a transformer in the forward power loop and
a temperature insensitive optical link in the feedback control loop.
Output regulation is accomplished with constant frequency pulse
width modulation. Both line and load regulation are typically within
10 mV.
On dual output models, the positive output is independently regu-
lated and the negative output is cross-regulated. Figures 7 and 8
illustrate what effects load changes have on the negative output.
I
NHIBIT
F
EATURE
An inhibit terminal is provided that can be used to disable internal
switching, resulting in a very low quiescent input current. An open
collector TTL compatible low (≤0.8 V) is required to control the
inhibit function. This level may be supplied by an open collector gate
since the inhibit pin is provided with an internal pull-up resistor.
B4-47
HR120 SERIES
12 WATT
ABSOLUTE MAXIMUM RATINGS
Input Voltage
• 16 to 40 VDC
• 19 to 40 VDC 15 volt outputs
Output Power
• 12 watts (10 watts HR121-2805)
Lead Soldering Temperature (10 sec per pin)
• 300°C
Storage Temperature Range (Case)
• –55°C to +125°C
DC/DC C
ONVERTERS
INHIBIT
Inhibit TTL Open Collector
• Logic low (output disabled)
Logic low 0.8 V max
Inhibit pin current 4 mA max
• Referenced to input common
• Logic high (output enabled)
Open collector
TYPICAL CHARACTERISTICS
Output Voltage Temperature Coefficient
• 150 ppm/°C, typical
Input to Output Capacitance
• 50 pF, typical
Current Limit
• 125% of full load, typical
Isolation
• 100 megohm minimum at 500 V
Conversion Frequency
• 600 kHz typical
Inhibit Pin Voltage (unit enabled)
• 8 to 11 V
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 16 to 40 VDC continuous
• 19 to 40 VDC continuous 15 volt outputs
• 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
LOAD REGULATION
INPUT VOLTAGE
MIN. TO MAX. V
IN
10 kHz to 2 MHz
MIN. TO MAX. V
IN
NO LOAD TO FULL
NO LOAD TO FULL
TRANSIENT 50 ms
INPUT CURRENT
NO LOAD
FULL LOAD
INHIBITED
INPUT RIPPLE
CURRENT
EFFICIENCY
LOAD FAULT
1
POWER DISSIPATION
OVERLOAD
SHORT CIRCUIT
START-UP
DELAY
—
—
—
—
–
180
5
3.5
300
—
—
—
—
—
80
5
2.8
200
—
—
—
—
—
150
5
2
250
ms
W
10 kHz TO 2 MHz
—
74
135
77
180
—
—
77
150
81
200
—
—
80
150
83
220
—
mA p-p
%
CONDITIONS
HR121-2805
MIN
4.95
—
—
—
—
—
16
—
—
—
—
TYP
5.0
—
—
40
10
10
28
—
20
—
2
MAX
5.05
2.0
10
60
50
50
40
50
30
478
3
HR121-2812
MIN
11.88
—
—
—
—
—
16
—
—
—
—
TYP
12
—
—
30
10
10
28
—
20
—
2
MAX
12.12
1.0
12
60
50
50
40
50
30
548
3
MIN
14.85
—
—
—
—
—
19
—
—
—
—
HR121-2815
TYP
15
—
—
25
10
10
28
—
20
—
2
MAX
15.15
0.8
12
50
50
50
40
50
30
535
3
mA
UNITS
VDC
A
W
mV p-p
mV
mV
VDC
Notes
1. Indefinite short circuit protection not guaranteed above 85°C case temperature.
B4-48
DC/DC C
ONVERTERS
DUAL OUTPUT MODELS
PARAMETER
OUTPUT VOLTAGE
CONDITION
+V
OUT
– V
OUT
OUTPUT CURRENT
1, 2
OUTPUT POWER
2
+V
OUT
– V
OUT
TOTAL
OUTPUT RIPPLE
VOLTAGE
LINE REGULATION
MIN. TO MAX. V
IN
LOAD REGULATION
NO LOAD TO FULL
CROSS REGULATION
10 kHz TO 2 MHz
+V
OUT
– V
OUT
+V
OUT
– V
OUT
20% TO 80% LOAD
3
50% LOAD
4
INPUT VOLTAGE
CONTINUOUS
TRANSIENT 50 ms
INPUT CURRENT
NO LOAD
FULL LOAD
INHIBITED
10 kHz TO 2 MHz
MIN
11.88
11.82
—
—
—
—
—
—
—
—
—
—
—
16
—
—
—
—
—
78
POWER DISSIPATION
OVERLOAD
SHORT CIRCUIT
START-UP
DELAY
—
—
—
—
—
150
2.8
5
250
—
—
—
—
—
150
2
5
250
ms
W
HR122-2812
TYP
MAX
12.0
12.0
0.5
—
—
—
30
5
30
5
30
5
4
28
—
25
—
1.9
175
81
12.12
12.18
1.0
10.8
10.8
12
60
50
150
50
150
10
5
40
50
35
545
3
240
—
MIN
HR122-2815
TYP
MAX
15.0
15.0
0.4
—
—
—
30
5
30
10
30
4
3
28
—
25
—
1.9
175
83
15.15
15.23
0.8
10.8
10.8
12
60
50
150
50
150
8
5
40
50
35
540
3
240
—
mA
VDC
%
mV
W
A
UNITS
VDC
HR120 SERIES
12 WATT
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
14.85
14.77
—
—
—
—
—
—
—
—
—
—
—
19
—
—
—
—
—
80
mV p-p
mV
INPUT RIPPLE
CURRENT
EFFICIENCY
LOAD FAULT
5
mA p-p
%
Notes
1. Applies to both outputs.
2. Maximum combined output power is 12 watts. A maximum of 90% is available from either output.
3. 20% to 80% load on the positive output and 80% to 20% on the negative output. See Figure 8.
4. 50% load on the positive output and 50% to 20% load on the negative output. 50% load on the negative output and
50% to 20% load on the positive output. See Figure 7.
5. Indefinite short circuit protection not guaranteed above 85°C case temperature.
PIN OUT
Pin
1
2
3
4
5
6
7
8
Single Output
Inhibit
No connection
Output Common
Positive Output
No connection
Case Ground
Input Common
Positive Input
Dual Output
Inhibit
Positive Output
Output Common
Negative Output
No connection
Case Ground
Input Common
Positive Input
Squared corner and dot on
top of cover indicate pin one.
MODEL NUMBER KEY
HR12
Base Model
2 - 28
12
1
2
3
4
5
Number of Outputs
(1 = single, 2 = dual)
Input Voltage
Output Voltage
BOTTOM VIEW
HR120
8
7
6
See Section B8, case E1, for dimensions
F
IGURE
1: P
IN
O
UT
B4-49
DC/DC C
ONVERTERS
90
90
16V
HR120 SERIES
12 WATT
90
19V
Typical Performance Curves: 25°C Tc , 28 VDC Vin, 100% load, unless otherwise specified.
80
16V
80
80
Efficiency (%)
Efficiency (%)
40V
70
28V
60
70
40V
28V
Efficiency (%)
40V
70
28V
60
60
50
2
4
6
8
10
12
14
50
2
4
6
8
10
12
14
50
2
4
6
8
10
12
14
Output Power (Watts)
Output Power (Watts)
Output Power (Watts)
HR121-2805 Efficiency
HR121-2812 Efficiency
HR121-2815 Efficiency
F
IGURE
2
90
16V
F
IGURE
3
Negative Output Voltage Change (%)
90
19V
F
IGURE
4
10
8
6
4
2
0
2
–4
–6
–8
–10
0
10
2
30
40
50
2812
2815
2812
80
80
Cond. A
Efficiency (%)
Efficiency (%)
40V
40V
70
28V
70
28V
60
60
Cond. B
50
50
2
4
6
8
10
12
14
2
4
6
8
10
12
14
Output Power (Watts)
Output Power (Watts)
HR122-2812 Efficiency
HR122-2815 Efficiency
Output Load (%)
Condition A: 50% Load Pos. Vout, 50% to 20% Neg. Vout
Condition B: 50% Load Neg. Vout, 50% to 20% Pos. Vout
HR122 Negative Output Voltage
Cross Regulation
F
IGURE
5
20
19
18
F
IGURE
6
19
18
F
IGURE
7
Negative Output Voltage Change (%)
15
10
Input Voltage (Volts)
Input Voltage (Volts)
17
16
15
14
13
12
2815
17
2815
16
15
14
13
12
11
2812
5
0
–5
–10
–15
–20
0
20
40
60
80
100
2812
2815
2812
2805
11
Output Load (%)
Positive Output 20% to 80% Load
Negative Output 80% to 20% Load
2
4
6
8
10
12
14
2
4
6
8
10
12
14
Output Power (Watts)
50 mV Drop
Output Power (Watts)
50 mV Drop
HR122 Negative Output Voltage
Cross Regulation
HR121 Low Line Dropout
HR122 Low Line Dropout
F
IGURE
8
F
IGURE
9
F
IGURE
10
B4-50
21821-009-DTS Rev A
DQ# 2011
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. HR120 Series is a trademark of Interpoint.
Copyright © 1994 - 1999 Interpoint. All rights reserved.
CASE E
C
ASES
Squared corner and dot on top
of case indicate pin one.
Materials
Header Cold Rolled Steel/Nickel/Gold
Cover Kovar/Nickel
(SMHF Series
Cold Rolled Steel/Nickel/Gold)
Pins
#52 alloy/Gold
compression glass seal
Case dimensions in inches (mm)
Tolerance
±0.005
(0.13) for three decimal places
±0.01
(0.3) 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.
CASE E
BOTTOM VIEW
See Figures 16 – 18
for pin configurations.
1.130 max
(28.70)
1.460 max
(37.08)
F
IGURE
15: C
ASE
E M
AXIMUM
D
IMENSIONS
BOTTOM VIEW CASE E1
MHF+ Series Single and Dual: Screening – Standard, ES, or 883
MHF Series and LIM5050 Module: Screening – Standard or ES
SMHF Series Single and Dual and SLIM5050 Module:
Screening – Space Standard, H, or K
HR120 Series: No screening options
Seam Seal
Projection Weld
Squared corner and dot on top
of case indicate pin one.
0.960
(24.38)
0.030 dia.
(0.76)
1
2
3
4
5
0.160
(4.06)
0.000
0.330 max
(8.38)
0.000
0.25 (6.35)
0.330 max
(8.38)
0.000
0.25 (6.35)
0.000
8
7
6
0.205
(5.21)
F
IGURE
16: C
ASE
E1
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.
B8-10
0.505
(12.83)
0.705
(17.91)
0.905
(22.99)
1.105
(28.07)
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