MHF SERIES
12 WATT
ABSOLUTE MAXIMUM RATINGS
Input Voltage
• 16 to 40 VDC (19 to 40 VDC 15 volt output)
Output Power
• 12 watts (10 watts MHF2805S)
Lead Soldering Temperature (10 sec per lead)
• 300°C
Storage Temperature Range (Case)
• –55°C to +135°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 15 volt outputs continuous
• 50 V for 50 msec transient
Case Operating Temperature (Tc)
• –55°C to +125°C full power
• –55°C to +110°C full power for MHF2805S
• –55°C to +135°C absolute
• –55°C to +130°C absolute for MHF2805S
Derating Output Power/Current
• Linearly from 100% at 125°C to 0% at 135°C
• Linearly from 100% at 110°C to 0% at 130°C
for MHF2805S
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
CONTINUOUS
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
MIN
4.95
—
—
—
—
—
16
—
—
—
—
MHF2805S
TYP
5.0
—
—
40
10
10
28
—
20
—
2
MAX
5.05
2.0
10
60
50
50
40
50
30
483
3
MIN
11.88
—
—
—
—
—
16
—
—
—
—
MHF2812S
TYP
12
—
—
30
10
10
28
—
20
—
2
MAX
12.12
1.0
12
60
50
50
40
50
30
557
3
MHF2815S
MIN
14.85
—
—
—
—
—
19
—
—
—
—
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
V
Notes
1. Indefinite short circuit protection not guaranteed above 125°C case temperature (110°C case for MHF2805S).
B2-78