MFW SERIES
70 WATT
ABSOLUTE MAXIMUM RATINGS
DC/DC C
ONVERTERS
SYNC AND INHIBIT
Sync In (245 to 370 kHz.)
• Duty cycle 70% min, 98% max
• Logic low 0.8 V max
• Logic high 4.5 V min
• 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 =
≥
4.5 V
TYPICAL CHARACTERISTICS
Output Voltage Temperature Coefficient
• 150 ppm/°C, typical
Input to Output Capacitance
• 160 pF, typical
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
Output Power
• 60 to 70 watts depending on model
Lead Soldering Temperature (10 sec per lead)
• 300°C
Storage Temperature Range (Case)
• –55°C to +125°C
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 19 to 40 VDC continuous (see Derating)
Case Operating Temperature (Tc)
• –55°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
OUTPUT
VOLTAGE
OUTPUT
CURRENT
OUTPUT
POWER
OUTPUT
RIPPLE
LINE
REGULATION
LOAD
REGULATION
INPUT
VOLTAGE
INPUT
CURRENT
INPUT REFL.
RIPPLE
EFFICIENCY
STARTUP
DELAY
CONDITION
FULL LOAD
V
IN
= 19 TO 40
Tc = –55°C TO +85°C
FULL LOAD BW
≤2
MHz
V
IN
= 19 TO 40
NO LOAD TO FULL
MFW2805S
MIN
4.95
—
—
—
—
—
19
NO LOAD
INHIBITED
FULL LOAD
BW
≤10
MHz
WITH LOW
IMPEDANCE SOURCE
—
—
—
78
—
TYP
5.00
—
—
30
10
10
28
75
30
10
80
5
MAX
5.05
12.00
60
50
20
20
40
90
35
25
—
10
MFW2812S
MIN
TYP MAX
MFW2815S
MIN.
TYP
MAX
UNITS
VDC
A
W
mV p-p
mV
mV
VDC
mA
mA p-p
%
ms
11.88 12.00 12.12
—
—
—
—
—
19
—
—
—
81
—
—
—
30
10
10
28
70
30
10
83
8
5.83
70
50
20
25
40
90
35
25
—
10
14.85 15.00 15.15
—
—
—
—
—
19
—
—
—
81
—
—
—
30
10
10
28
70
30
10
83
8
4.67
70
50
20
25
40
90
35
25
—
10
B4-4
INTERPOINT [ INTERPOINT CORPORATION COMPANY ]
