HR700 SERIES
70 WATT
DC/DC CONVERTERS
ABSOLUTE MAXIMUM RATINGS
SYNC AND INHIBIT
TYPICAL CHARACTERISTICS
Output Power
Sync In (245 to 370 kHz.)
• Duty cycle 70% min, 98% max.
• Logic low 0.8V max
Output Voltage Temperature Coefficient
• 150 ppm/°C, typical
Input to Output Capacitance
• 160 pF, typical
• 60 to 70 watts depending on model
Lead Soldering Temperature (10 sec per lead)
• 300°C
• Logic high 4.5 V min
Storage Temperature Range (Case)
• –55°C to +125°C
• 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
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
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 19 to 40 VDC continuous (see Derating)
Case Operating Temperature (Tc)
• –40°C to +85°C full power
DERATING OUTPUT POWER/CURRENT AND INPUT VOLTAGE
Temperatures are referenced to the temperature at the converter’s baseplate
• Linearly derate output power/current from 100% at 85°C to 0% at 125°C.
• Above 105°C linearly derate steady state input voltage to 33 volts at 125°C.
• Indefinite short circuit protection is not guaranteed above 85°C 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: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
SINGLE OUTPUTS
PARAMETER
HR701-2805
HR701-2812
HR701-2815
CONDITION
MIN TYP MAX
MIN TYP MAX
MIN. TYP MAX
UNITS
OUTPUT
VOLTAGE
FULL LOAD
4.90 5.00
5.10
12.00
60
11.75 12.00 12.25
14.75 15.00 15.25
VDC
OUTPUT
CURRENT
V
= 19 TO 40
IN
—
—
—
—
—
—
30
10
—
—
—
—
—
—
30
10
5.83
70
—
—
—
—
—
—
30
10
4.67
70
A
W
OUTPUT
POWER
Tc = –55°C TO +85°C
OUTPUT
RIPPLE
FULL LOAD BW ≤ 2 MHz
100
30
100
30
100
30
mV p-p
mV
LINE
REGULATION
V
= 19 TO 40
IN
LOAD
REGULATION
NO LOAD TO FULL
—
10
28
30
40
—
10
28
30
40
—
10
28
30
40
mV
INPUT
VOLTAGE
19
19
19
VDC
INPUT
CURRENT
NO LOAD
INHIBITED
—
—
75
30
100
35
—
—
70
30
100
35
—
—
70
30
100
35
mA
INPUT REFL.
RIPPLE
FULL LOAD
BW ≤10 MHz
—
10
50
—
10
50
—
10
50
mA p-p
EFFICIENCY
77
—
80
5
—
80
—
83
8
—
80
—
83
8
—
%
STARTUP
DELAY
WITH LOW
IMPEDANCE SOURCE
10
10
10
ms
B4-34
CRANE [ Crane Aerospace & Electronics. ]
