MRH SERIES
15 WATT
ABSOLUTE MAXIMUM RATINGS
DC/DC C
ONVERTERS
INHIBIT
Inhibit TTL Open Collector
• Logic low (output disabled)
Inhibit pin current
≤
–2 mA
• Referenced to input common
• Logic high (output enabled)
Open collector
TYPICAL CHARACTERISTICS
Output Voltage Temperature Coefficient
• 250 ppm/°C max
Input to Output Capacitance
• 100 p, typical
Current Limit
• 125% of full load typical
Isolation
• 100 megohm minimum at 500 V
Conversion Frequency
• 375 kHz. typical
Inhibit Pin Voltage (unit enabled)
• 5 to 6 V
Radiation (will operate through)
• Neutron fluence 10
13
neutrons/ sq. cm.
• Radiation dose rate 10
11
rads (Si) /sec
• Total dose 10
5
rads (Si)
Power Dissipation (Pd)
• 5W
Output Power
• 15 watts
Lead Soldering Temperature (10 sec per lead)
• 300°C
Storage Temperature Range (Case)
• –65°C to +125°C
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• Continuous
16 to 40 VDC MRH28XXS and MRH2812D
19 to 40 VDC MRH2815D
16 to 36 VDC MRH285XXT
• 50 V for 50 msec transient
Case Operating Temperature (Tc)
• –55°C to +85°C full power
• –55°C to +125°C absolute
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 V and
transient voltage to 38 V, at 125°C.
• 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 9 and 10.
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
1
INPUT VOLTAGE
2
–55°C TO +85°C
MIN. TO MAX. V
IN
10 kHz TO 2 MHz
16 TO 40 V
IN
MIN. LOAD TO FULL
NO LOAD TO FULL
TRANSIENT 50 ms
INPUT CURRENT
NO LOAD
FULL LOAD
INHIBITED
INPUT RIPPLE
CURRENT
EFFICIENCY
LOAD FAULT
3
POWER DISSIPATION
START-UP
SHORT CIRCUIT
OVERLOAD
DELAY
10 kHz TO10 MHz
—
73
—
—
—
25
75
5
5
3
50
—
—
—
10
—
76
—
—
—
25
78
5
5
3
50
—
—
—
10
—
78
—
—
—
25
80
5
5
3
50
—
—
—
10
ms
mA p-p
%
W
CONDITIONS
MIN
4.95
0.05
0.25
—
—
—
16
—
—
—
—
MRH2805S
TYP
5.0
—
—
40
5
5
28
—
50
—
22
MAX
5.05
3.0
15
70
10
30
40
50
60
750
25
MIN
11.88
0.02
0.25
—
—
—
16
—
—
—
—
MRH2812S
TYP
12
—
—
25
5
5
28
—
50
—
22
MAX
12.12
1.25
15
50
20
30
40
50
60
730
25
MIN
14.85
0.016
0.25
—
—
—
19
—
—
—
—
MRH2815S
TYP
15
—
—
25
5
5
28
—
50
—
22
MAX
15.15
1.0
15
50
20
30
40
50
60
720
25
mA
UNITS
VDC
A
W
mV p-p
mV
mV
VDC
V
Notes
1. Load regulation is not guaranteed below minimum load.
2. Converter should not be inhibited or operated below 12 Vin above 10
4
rads (Si) total dose.
3. Indefinite short circuit protection is not guaranteed above 85°C case.
B4-20
CRANE [ Crane Aerospace & Electronics. ]
