F
EATURES
•
•
•
•
•
•
•
–55° to +125°C operation
16 to 50 VDC input
Fully Isolated
Optocoupler feedback
Fixed switching frequency
600 kHz typical,
Topology –
Dual Single Ended Flybacks
80 V / 120 ms transient protection
(12 Vout single and dual to 75 V,
15 Vout single and dual to 60V)
Inhibit and sync functions
Trim on single output models
Up to 84% efficiency
Low output noise
DC/DC C
ONVERTERS
28 V
OLT
I
NPUT
MHV SERIES
15 WATT
MODELS
VDC O
UTPUT
SINGLE
DUAL
TRIPLE
3.3
±5
+5 & ±12
5
±12
+5 & ±15
12
±15
15
•
•
•
•
Size (max.): Non flanged Single and dual output models, case H2, 2.125 x 1.125 x 0.400 inches (53.98 x 28.58 x 10.16 mm)
Triple output models, case F1, 1.950 x 1.350 x 0.405 inches (49.53 x 34.29 x 10.29 mm)
Flanged Single and dual output models, case K3, 2.910 x 1.125 x 0.400 inches (73.91 x 28.58 x 10.16 mm)
Triple output models, case J1, 2.720 x 1.350 x 0.405 inches (69.09 x 34.29 x 10.29 mm)
See Section B8, cases H2, F1, K3, and J1 for dimensions.
Weight:
60 grams maximum.
Screening: Standard, ES, or 883 (Class H). See Section C2 for
screening options, see Section A5 for ordering information.
DESCRIPTION
Interpoint’s MHV Series™ of DC/DC converters offer a wide input
voltage range of 16 to 50 VDC and a choice of nine different output
voltage configurations comprised of single, dual or triple outputs.
The converters will withstand transients of up to 80 V for up to 120
milliseconds while maintaining output voltages (with the exception of
the 12 volt single and dual outputs which will withstand transients up
to 75 volts and the 15 volt single and dual outputs which will with-
stand up to 60 volts). The MHV Series operates at a full 15 watts of
output power (10 watts for the 3.3 volt single output) over the mili-
tary temperature range of –55°C to +125°C while maintaining low
input and output noise.
When a low (0.8 V) is applied to the inhibit terminal the converter
shuts down, typically drawing 8.4 mA of input current. Inhibit
terminal resistance is 3.3 k ohms and draws 8.4 mA, typical.
S
YNCHRONIZATION
F
UNCTION
Applying an external signal of 40% to 60% duty cycle and 500 to
700 kHz will synchronize the converter to your system requirements.
Free run clock frequency is approximately 600 kHz. If not used, the
sync terminal must be left unconnected.
T
RIM
Single output converters feature a trim range of as low as 80% to
as high as 110% of Vout nominal, depending on the model. To trim
up, connect a resistor from output common (pin 4) to the trim
terminal (pin 3). To trim down, connect a resistor from the positive
output (pin 5) to the trim terminal (pin 3). See Figure 4 and trim
tables for more information.
C
ONVERTER
D
ESIGN
MHV Series DC/DC converters are switching regulators that use
continuous flyback conversion topology with a clock frequency of
approximately 600 kHz. MHV Series converters incorporate two
internal converters with one converter phase shifted 180° from the
other to create a dual phase/phase-shifted operation. Each of the
internal converters operates at approximately one-half of the clock
frequency. This proprietary technology eliminates cross regulation,
minimizes input ripple, greatly reduces output ripple and improves
efficiency. On the triple output models, this design provides
completely independent regulation with no cross regulation effect
between the main and auxiliary outputs and no minimum loading
required on the main output.
U
NDERVOLTAGE
L
OCKOUT
An undervoltage lockout of approximately 7 VDC keeps system
current levels low during startup.
S
HORT
C
IRCUIT
P
ROTECTION
Under short circuit conditions of 130% or more of full load current,
the converter will protect itself by shutting down. Short circuit dura-
tion should be brief because power dissipation may cause internal
temperatures to rise rapidly. Restart is automatic upon removal of
the short circuit.
I
NHIBIT
F
UNCTION
Open collector TTL levels control the inhibit circuit. The converter is
enabled when the inhibit terminal is left unconnected or when the
inhibit terminal is connected to a voltage between 11.5 and 50 V.
1
MHV SERIES
15 WATT
ABSOLUTE MAXIMUM RATINGS
Input Voltage
• 16 to 50 VDC
Output Power
• 15 watts (10 watts MHV283R3S)
Lead Soldering Temperature (10 sec per lead)
• 300°C
Storage Temperature Range (Case)
• –65°C to +150°C
DC/DC C
ONVERTERS
SYNC AND INHIBIT
Sync In (500 to 700 kHz)
• Duty cycle 40% min, 60% max
• Logic low 0.8 V max
• Logic high 4.5 V min, 10 V max
• Referenced to input common
• If not used, leave unconnected
Inhibit TTL Open Collector
• Logic low (output disabled)
Logic low voltage
≤0.8
V
Inhibit pin current
8.4 mA typical, 10 mA maximum
• Referenced to input common
• Logic high (output enabled)
Open collector
Unconnected or 11.5 to 50 V
TYPICAL CHARACTERISTICS
Output Voltage Temperature Coefficient
• 100 ppm/°C typical
Undervoltage Lockout
• 7 V input typical
Current Limit
• 130% of full load typical at 25°C
Isolation
• 100 megohm minimum at 500 V
Audio Rejection
• 30 dB typical
Conversion (Switching) Frequency
• Free run mode 300 kHz
typical 245 kHz. min, 355 kHz. max
Clock Frequency
• External sync range 500 to 700 kHz.
Inhibit Pin Voltage (unit enabled)
• 11 V typical
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 16 to 50 VDC continuous
• Transient: see Electrical Characteristics tables
Case Operating Temperature (Tc)
• –55°C to +125°C full power
• –55°C to +130°C absolute
Derating Output Power/Current
• Linearly from 100% at 125°C to 0% at 130°C
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
SINGLE OUTPUT MODELS
PARAMETER
OUTPUT VOLTAGE
OUTPUT CURRENT
OUTPUT POWER
OUTPUT RIPPLE
VOLTAGE
LINE REGULATION
LOAD REGULATION
INPUT VOLTAGE
NO LOAD TO FULL
INPUT CURRENT
V
IN
= 16 to 50 VDC
V
IN
= 16 to 50 VDC
10 kHz - 2 MHz
Tc = –55°C to +125°C
V
IN
= 16 to 50 VDC
NO LOAD TO FULL
CONTINUOUS
TRANSIENT 120 ms
NO LOAD
FULL LOAD
INHIBITED
INPUT RIPPLE
CURRENT
1
EFFICIENCY
LOAD FAULT
2
POWER DISSIPATION
SHORT CIRCUIT
2
RECOVERY
OUTPUT CURRENT
TRIP POINT
STEP LOAD
RESPONSE
3
START-UP
0 TO 28 V
IN
50% – 100% – 50%
TRANSIENT
RECOVERY
DELAY
OVERSHOOT
—
—
—
—
—
—
5
50
250
700
20
100
—
—
—
—
—
—
5
0
300
1500
20
50
—
—
—
—
—
—
5
0
300
900
20
120
—
—
—
—
—
—
5
0
350
700
20
150
mV pk
µs
ms
mV pk
3.97
—
—
3.93
—
—
1.64
—
—
1.31
—
—
A
—
—
—
—
9.5
20
—
—
—
—
11
20
—
—
—
—
11
20
—
—
—
—
10.5
20
W
ms
10 kHz - 20 MHz
Tc = –55°C to +125°C
—
69
10
73
50
—
—
74
10
78
50
—
—
79
10
84
50
—
—
78
10
84
50
—
mA pp
%
—
—
—
16
—
—
—
—
5
0
15
28
—
23
489
8.4
60
20
45
50
80
45
518
10
—
—
—
16
—
—
—
—
10
0
15
28
—
29
687
8.4
60
20
40
50
80
52
724
10
—
—
—
16
—
—
—
—
7
0
5
28
—
26
638
8.4
60
20
35
50
75
51
678
10
—
—
—
16
—
—
—
—
5
0
5
28
—
28
638
8.4
60
20
40
50
60
57
687
10
mV p-p
mV
mV
VDC
V
mA
mA
mA
CONDITIONS
MHV283R3S
MIN
3.27
0
0
TYP
3.30
—
—
MAX
3.33
3.03
10
MHV2805S
MIN
4.95
0
0
TYP
5.00
—
—
MAX
5.05
3.0
15
MHV2812S
MIN
11.88
0
0
TYP
—
—
MAX
1.25
15
MHV2815S
MIN
0
0
TYP
—
—
MAX
15.15
1.0
15
UNITS
VDC
A
W
12.00 12.12
14.85 15.00
Notes
1. Lin =
2. Load
3. Load
4. Input
5.5 µH.
fault is a short circuit (<50 mΩ). Recovery is into a resistive load.
step transition
≥
10 µs. Recovery = time to settle to within 1% of Vout final value.
step transition
≥
10 µs. Recovery = time to settle to within 1% of Vout final value.
2
MHV SERIES
15 WATT
TRIPLE OUTPUT MODELS
PARAMETER
OUTPUT VOLTAGE
DC/DC C
ONVERTERS
MHV28512T
CONDITION
MAIN
+ AUXILIARY
– AUXILIARY
MIN
4.95
11.88
11.82
0
—
—
—
—
—
—
—
MAIN
± AUXILIARY
—
—
—
—
—
—
—
—
—
—
16
—
—
—
—
—
76
SHORT CIRCUIT
POWER DISSIPATION
MAIN
± AUXILIARY
—
—
—
—
—
—
—
—
—
—
—
—
—
5
9
8
250
500
2.5
4
12
—
—
—
—
—
—
—
—
—
—
—
—
—
5
9
8
250
500
2.5
3.5
12
W
TYP
5.0
12.0
12.0
—
—
—
—
—
—
—
—
5
5
0
1
1
10
10
10
300
400
28
—
23
670
8.4
10
80
MAX
5.05
12.12
12.18
2.0
0.333
0.333
2.416
10
4
4
15
30
30
20
35
35
25
45
65
500
700
50
80
32
705
10
40
—
MIN
4.95
14.85
14.77
0
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
16
—
—
—
—
—
76
MHV28515T
TYP
5.0
15.0
15.0
—
—
—
—
—
—
_
—
10
10
0
5
5
10
15
15
300
400
28
—
28
670
8.4
15
80
MAX
5.05
15.15
15.23
2.0
0.267
0.267
2.333
10
4
4
15
35
35
20
35
35
25
55
80
500
700
50
80
37
705
10
40
—
mA p-p
%
mA
mV
VDC
mV
mV
mV p-p
W
A
VDC
UNITS
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
OUTPUT CURRENT
1
V
IN
= 16 TO 50
MAIN
+ AUXILIARY
– AUXILIARY
TOTAL
OUTPUT POWER
2
V
IN
= 16 TO 50
MAIN
+ AUXILIARY
– AUXILIARY
TOTAL
OUTPUT RIPPLE
VOLTAGE
LINE REGULATION
V
IN
= MIN. TO MAX.
LOAD REGULATION
10 kHz to 2 MHz
10 kHz to 2 MHz
MAIN
+AUXILIARY
– AUXILIARY
MAIN
+AUXILIARY
– AUXILIARY
CROSS REGULATION
3
– AUXILIARY
INPUT VOLTAGE
CONDITION A
CONDITION B
CONTINUOUS
TRANSIENT 120 ms
INPUT CURRENT
NO LOAD
FULL LOAD
INHIBITED
INPUT RIPPLE CURRENT
EFFICIENCY
LOAD FAULT
4
10 kHz to 10 MHz
STEP LOAD RESPONSE
5, 6
TRANSIENT
MAIN
± AUXILIARY
RECOVERY
MAIN
± AUXILIARY
DELAY EACH OUTPUT
mV
ms
ms
START-UP
6
0 TO 28 V
IN
Notes
1. The sum of the 12 volt auxiliary output currents may not exceed 416 mA.
The sum of the 15 volt auxiliary output currents may not exceed 333 mA.
2. The sum of the auxiliary output power may not exceed 5 watts.
3. Cross regulation occurs between the two auxiliaries and is measured on –aux.
+5 is held constant at 2.0 A. Cross regulation is specified for two conditions:
A. Positive aux. = 2.5 W; negative aux. = 2.5 W to 0.5 W.
B. Negative aux. = 4 W to 1 W; positive aux. = 1 W to 4 W, simultaneous.
4. Load fault is a short circuit (<50 mΩ). Recovery is into a resistive load.
5. Load step transition
≥
10 µs. Recovery = time to settle to within 1% of Vout
final value.
6. Input step transition
≥
10 µs. Recovery = time to settle to within 1% of Vout
final value.
7. Lin = 5.5 µH.
4
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