F
EATURES
•
•
•
•
•
•
•
-55°C to +125°C operation
12 to 50 VDC input
Fully isolated
Magnetic feedback
Fixed frequency 370 kHz typ.
Topology – Current Mode Flyback
80 V for up to 120 ms transient protection
(70 V for 15 V single and dual models)
• Inhibit function
• Short circuit protection
• Undervoltage lockout
DC/DC C
ONVERTERS
28 V
OLT
I
NPUT
MCH SERIES
1.5 WATT
MODELS
VDC O
UTPUT
SINGLES
5
5.2
12
15
DUALS
±5
±12
±15
Size (max.): 0.980 x 0.805 x 0.270 inches (24.89 x 20.45 x 6.86 mm)
Weight:
12 grams max.
Screening: Standard, ES, or 883 (Class H)
DESCRIPTION
With a miniature footprint of just 0.8 square inches, the MCH
Series™ of DC/DC converters delivers 1.5 watts of output power
while saving significant board real estate. The wide input voltage
range of 12 to 50 VDC accepts the varying voltages of military, aero-
space, or space bus power and tightly regulates output voltages to
protect downstream components. Transient protection of 80 volts for
up to 120 milliseconds exceeds the requirements of MIL-STD-704A
for the 5, 5.2, and 12 volt single models and the 12 volt dual model.
The 15 volt single and dual converters will withstand transients of up
to 70 volts for up to 120 milliseconds.
I
NHIBIT
F
UNCTION
When an open collector TTL logic low is applied to the inhibit
terminal, pin 7, the converter shuts down and lowers the output
voltage to near zero and input current to as low as 2.3 mA. Leaving
the terminal open or applying an open collector TTL logic high will
enable the converter.
P
ROTECTION
F
EATURES
Undervoltage lockout prevents the MCH Series converters from
operating below approximately 8 VDC input voltage to keep system
current levels smooth, especially during initialization or re-start oper-
ations. All models include a soft-start function to prevent large
current draw and minimize overshoot. The converters also provide
short circuit protection by restricting the current.
C
ONVERTER
D
ESIGN
MCH Series DC/DC converters incorporate a continuous flyback
topology with a constant switching frequency of approximately 370
kHz. Current-mode pulse width modulation (PWM) provides output
voltage regulation. Output error voltage is magnetically fed back to
the input side of the PWM to regulate output voltage. Regulation is
also affected by the load; refer to the Electrical Characteristics
tables on the following pages.
Dual models regulate the negative output with magnetic coupling to
the positive output. Up to 80% of the total load may be on one output
providing that the other output carries a minimum of 20% of the total
load. The dual models can be used at double the output voltage by
connecting the load between positive and negative outputs, leaving
the common unconnected. (ex: MCH2805D can be used as a 10
VDC output.)
POSITIVE 1
INPUT
MIL-STD-461
Use Interpoint’s FMSA-461 EMI filter to pass the CE03 requirements
of MIL-STD-461C.
C
ONVENIENT
P
ACKAGING
The MCH Series converters are packaged in hermetically sealed,
projection-welded metal cases which provide EMI/RFI shielding.
+
0.47
µF
typical
+V
IN
FB
+
3 POSITIVE
OUTPUT
INHIBIT
7
SHUTDOWN
PWM
CONTROLLER
+V
OUT
+
4 OUTPUT
COMMON
6 NEGATIVE
OUTPUT
DUAL MODELS ONLY
INPUT
COMMON
2
F
IGURE
1: B
LOCK
D
IAGRAM
1
MCH SERIES
1.5 WATT
ABSOLUTE MAXIMUM RATINGS
Input Voltage
• 12 to 50 VDC
Output Power
• 1.5 W
Capacitive Load
• Single output models 200 µF
• Dual output models 100 µF
Lead Soldering Temperature (10 sec per lead)
• 300°C
Storage Temperature Range (Case)
• –65°C to +150°C
DC/DC C
ONVERTERS
INHIBIT
Inhibit – TTL Open Collector
• Logic low (output disabled) 0.8 V max
Inhibit pin current 1 mA max
• Referenced to input common
• Logic high (output enabled) open collector
TYPICAL CHARACTERISTICS
Output Voltage Temperature Coefficient
• 100 ppm/°C typical
Input to Output Capacitance
• 100 to 170 pF typical
Undervoltage Lockout
• 8 V input typical
Current Limit
• 125% of full load typical
Isolation
• 100 megohm minimum at 500 V
Audio Rejection 40 dB, typical
Conversion Frequency (kHz)
• 25°C, 300 min, 370 typ, 450 max
• –55°C to +125°C
270 min, 370 typ, 470 max
Inhibit Pin Voltage (unit enabled)
• 7 to 12 V
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 12 to 50 VDC continuous
• 80 V for 120 msec transient
(70 V for 15 V single and dual models)
Case Operating Temperature (Tc)
• –55°C to +125°C full power
• –55°C to +135°C absolute
Derating Output Power/Current (Tc)
• Linearly from 100% at 125°C to 0% at 135°C
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
SINGLE OUTPUT MODELS
PARAMETER
CONDITIONS
OUTPUT VOLTAGE
1
Tc = 25°C
Tc = –55°C TO +125°C
OUTPUT CURRENT
V = 12 to 50 VDC
IN
MCH2805S
MCH285R2S
MCH2812S
MCH2815S
MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX
4.95
5
5.05 5.15 5.2 5.25 11.88 12 12.12 14.85 15 15.15
4.80
5
5.20 5.00 5.2 5.40 11.52 12 12.48 14.40 15 15.60
—
300
0
—
288
0
—
125
0
—
100 mA
0
—
—
—
—
—
—
—
—
12
0
—
—
—
—
—
—
—
—
72
69
—
—
—
—
–400
–500
—
—
–400
–500
—
—
—
—
—
—
—
45
65
35
40
350
380
100
115
28
—
5.5
6.0
70
73
2.3
2.4
100
130
77
75
1.3
1.4
3.0
3.5
185
185
125
125
170
180
0.75
0.75
7
10
0
0
1.5
150
300
100
120
700
800
200
300
50
80
10
11
74
78
3.2
3.5
200
250
—
—
2.0
2.3
12
15
400
500
500
600
400
500
3.0
4.0
20
40
100
150
0
—
—
—
—
—
—
—
—
12
0
—
—
—
—
—
—
—
—
72
69
—
—
—
—
–400
–500
—
—
—
45
65
35
40
350
380
100
115
28
—
5.5
6.0
70
73
2.3
2.4
100
130
77
75
1.3
1.4
3.0
3.5
185
185
125
125
1.5
150
300
100
120
700
800
200
300
50
80
10
11
74
78
3.2
3.5
200
250
—
—
2.0
2.3
12
15
400
500
500
600
0
—
—
—
—
—
—
—
—
12
0
—
—
—
—
—
—
—
—
74
72
—
—
—
—
–700
–800
—
—
—
50
70
60
70
600
640
145
160
28
—
6.0
6.5
68
70
2.3
2.4
100
150
79
77
2.0
2.2
3.5
3.5
350
380
130
130
1.5
200
300
200
250
1300
1400
300
400
50
80
10
12
72
74
3.2
3.5
200
250
—
—
3.2
3.5
15
20
700
800
500
600
0
—
—
—
—
—
—
—
—
12
0
—
—
—
—
—
—
—
—
74
72
—
—
—
—
–700
–800
—
—
—
1.5
UNITS
VDC
OUTPUT POWER
OUTPUT RIPPLE
VOLTAGE
LINE REGULATION
LOAD REGULATION
V
IN
= 12 TO 50 VDC
10 kHz - 2 MHz
Tc = –55°C TO +125°C
V = 12 TO 50 VDC
IN
Tc = –55°C TO +125°C
10% TO FULL LOAD
Tc = –55°C TO +125°C
50% TO FULL
Tc = –55°C TO +125°C
CONTINUOUS
TRANSIENT 120 ms
NO LOAD
Tc = –55°C TO +125°C
FULL LOAD
Tc = –55°C TO +125°C
INHIBITED
Tc = –55°C TO +125°C
10k Hz - 10 MHz
Tc = –55°C TO +125°C
Tc = 25°C
Tc = –55°C TO +125°C
POWER DISSIPATION
Tc = –55°C TO +125°C
RECOVERY
Tc = -–55°C TO +125°C
50 %–100%– 50% LOAD
TRANSIENT
Tc = –55°C TO +125°C
RECOVERY
Tc =–55°C TO +125°C
12 TO 50 TO 12 V
IN
TRANSIENT
Tc = –55°C TO +125°C
RECOVERY
Tc = –55°C TO +125°C
DELAY
Tc = –55°C TO +125°C
OVERSHOOT
Tc = –55°C TO +125°C
W
mV p-p
mV
INPUT VOLTAGE
NO LOAD TO FULL
INPUT CURRENT
INPUT RIPPLE
CURRENT
2
EFFICIENCY
LOAD FAULT
3, 4
35 150
50 250
70 300
80 350
700 1500
760 1600
165 350
185 450
28
50
—
70
6.0
11
6.5
12
68
72
70
74
2.3 3.2
2.4 3.5
100 200
150 250
79
—
77
—
2.3 3.7
2.5 4.0
4.0
18
4.0
20
350
380
140
180
700
800
600
750
750
850
2.0
2.5
20
40
300
450
mV
VDC
V
mA
mA p-p
%
W
ms
STEP LOAD
RESPONSE
5
mV pk
µs
STEP LINE
RESPONSE
5
START-UP
0 TO 28 VDC
–400 170
–500 180
—
0.75
—
0.75
—
7
—
10
—
0
—
0
400 –900 400
500 –1000 400
3.0
—
0.6
4.0
—
0.6
20
—
7
40
—
10
100
—
0
150
—
0
900 –750 400
1000 –850 450
2.5
—
0.47
3.0
—
0.5
20
—
7
40
—
10
250
—
0
350
—
0
mV pk
ms
ms
mV pk
See notes 1, 2, 3, 4, 5, and 6 on the following page.
2
DC/DC C
ONVERTERS
DUAL OUTPUT MODELS
PARAMETER
1
OUTPUT VOLTAGE
OUTPUT CURRENT
OUTPUT POWER
OUTPUT RIPPLE
VOLTAGE +V
OUT
–V
OUT
7
8
6
MCH SERIES
1.5 WATT
UNITS
VDC
mA
W
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
CONDITIONS
Tc = 25°C
Tc = –55°C TO +125°C
V = 12 TO 50 VDC
IN
MCH2805D
MIN TYP MAX
±4.95 ±5
±5.05
±4.80 ±5
±5.20
0
±150
240
0
—
—
—
—
—
—
—
—
—
—
12
0
—
—
—
—
—
—
—
—
73
70
—
—
—
—
–300
–400
—
—
–250
–300
—
—
—
—
—
—
—
35
50
35
50
10
20
300
350
80
100
28
—
5.0
6.0
69
72
2.3
2.4
100
130
77
75
1.4
1.6
3.7
3.8
130
140
100
100
125
130
0.6
0.6
8
10
0
0
1.5
150
250
150
250
50
100
600
700
200
300
50
80
10
12
73
77
3.2
3.5
200
250
—
—
2.2
2.5
15
20
300
400
400
500
250
300
2.5
3.0
25
45
100
150
MCH2812D
MCH2815D
MIN TYP MAX
MIN TYP MAX
±11.88 ±12 ±12.12 ±14.85 ±15 ±15.15
±11.52 ±12 ±12.48 ±14.40 ±15 ±15.60
0
±62.5 100
0
±50
80
0
—
—
—
—
—
—
—
—
—
—
12
0
—
—
—
—
—
—
—
—
73
70
—
—
—
—
–600
–700
—
—
–500
–600
—
—
—
—
—
—
—
35
40
35
40
100
110
550
570
115
130
28
—
7.5
8.0
70
71
2.3
2.4
115
150
77
75
2.5
2.7
3.2
3.2
250
260
165
165
240
250
0.9
0.9
8
10
0
0
1.5
150
250
150
250
300
400
1100
1200
250
350
50
80
13
14
73
77
3.2
3.5
200
250
—
—
3.8
4.2
15
20
600
700
700
800
500
600
3.0
4.0
25
45
250
350
0
—
—
—
—
—
—
—
—
—
—
12
0
—
—
—
—
—
—
—
—
72
69
—
—
—
—
–600
–700
—
—
–500
–600
—
—
—
—
—
—
—
30
35
30
35
165
180
600
630
125
135
28
—
7.5
8.0
71
72
2.3
2.4
90
120
76
74
2.7
3.0
4.0
4.0
250
270
50
50
220
230
0.6
0.7
8
10
0
0
1.5
150
250
150
250
500
650
1300
1400
300
400
50
70
13
14
74
78
3.2
3.5
200
250
—
—
4.1
4.5
15
20
600
700
200
300
500
600
3.0
4.0
25
45
750
900
V
IN
= 12 TO 50 VDC
10 kHz - 2 MHz
Tc = –55°C TO +125°C
10 kHz - 2 MHz
Tc = –55°C TO +125°C
V
IN
= 12 TO 50 VDC
Tc = –55°C TO +125°C
10% TO FULL
–55°C TO +125°C
50% TO FULL
–55°C TO +125°C
CONTINUOUS
TRANSIENT 120 ms
NO LOAD
Tc = –55°C TO +125°C
FULL LOAD
Tc = –55°C TO +125°C
INHIBITED
Tc = –55°C TO +125°C
10 kHz - 10 MHz
Tc = –55°C TO +125°C
Tc = 25°C
Tc = –55°C TO +125°C
mV p-p
LINE REGULATION
mV
LOAD REGULATION
±V
OUT
mV
INPUT VOLTAGE
NO LOAD TO FULL
INPUT CURRENT
VDC
V
mA
INPUT RIPPLE
CURRENT
EFFICIENCY
LOAD FAULT
2
mA p-p
%
W
ms
POWER DISSIPATION
Tc = –55°C TO +125°C
RECOVERY
Tc = –55°C TO +125°C
STEP LOAD
50 %–100%– 50% LOAD
5
TRANSIENT
RESPONSE ± V
OUT
Tc = –55°C TO +125°C
RECOVERY
–55°C TO +125°C
STEP LINE
12 TO 50 TO 12 V
IN
5
RESPONSE ± V
OUT
TRANSIENT
Tc = –55°C TO +125°C
RECOVERY
Tc = –55°C TO +125°C
START–UP
DELAY
0 TO 28 VDC, ± V
OUT
Tc = –55°C TO +125°C
OVERSHOOT
Tc = –55°C TO +125°C
3,4
mV pk
µs
mV pk
ms
ms
mV pk
Notes:
1. Specified at 50% load.
2. Lin = 2 µH.
3. Maximum duration of short circuit: 25°C-– 90 seconds, 125°C – 30 seconds.
4. Load fault is a short circuit (<50 mohms). Recovery is into resistive full load.
5. Transition
≥
10 µs. Recovery = time to settle to within 1% of Vout final value.
6. Max. spec indicates 80% of the converter’s total power, available from either
output.
7. Specification applies to both + and – Vout.
8. Although no minimum load is required, at no load the output voltage may
increase up to 15%.
3
MCH SERIES
1.5 WATT
DC/DC C
ONVERTERS
PIN OUT
Pin
1
2
3
4
5
6
7
Single Output
Positive Input
Input Common
Positive Output
Output Common
Case Ground
No connection
Inhibit
Dual Output
Positive Input
Input Common
Positive Output
Output Common
Case Ground
Negative Output
Inhibit
Squared corner and dot on
top of cover indicate pin one.
1 2
3
4
7
6
5
See page 7 for dimensions.
F
IGURE
2: P
IN
O
UT
MODEL NUMBERING KEY
MCH
Base Model
Input Voltage
Output Voltage
(R = decimal point, 3R3 = 3.3 Vout)
Number of Outputs
(S = single, D = dual)
Screening
(Standard screening has no designator
in this position.)
28 12 D / 883
SMD NUMBERS
S
TANDARD
M
ICROCIRCUIT
D
RAWING
(SMD)
5962-9569601HXC
IN PROCESS
5962-9569701HXC
5962-9569801HXC
5962-9570201HXC
5962-9570301HXC
5962-9570401HXC
MCH S
ERIES
S
IMILAR
P
ART
MCH2805S/883
MCH285R2S/883
MCH2812S/883
MCH2815S/883
MCH2805D/883
MCH2812D/883
MCH2815D/883
For exact specifications for an SMD product, refer to the SMD
drawing. Call your Interpoint representative for status on the MCH
Series SMD releases which are “in process”. SMDs can be down-
loaded from
http://www.dscccols.com/programs/smcr
4
DC/DC C
ONVERTERS
90
80
12 VOLT
70
EFFICIENCY
28 VOLT
EFFICIENCY
60
50
50 VOLT
70
EFFICIENCY
28 VOLT
60
50
50 VOLT
28 VOLT
60
50
90
90
80
80
12 VOLT
70
MCH SERIES
1.5 WATT
TYPICAL PERFORMANCE CURVES: Tc = 25°C, full load, Vin = 28 VDC, unless otherwise specified.
12 VOLT
50 VOLT
40
40
40
30
0.25 0.5
0
OUTPUT POWER
0.75
1
1.25 1.5 1.75
ALL 5 VOLT MODELS
30
0.25 0.5
0
OUTPUT POWER
1
1.25 1.5 1.75
0.75
12 & 15 VOLT SINGLE MODELS
30
0.25 0.5
0
OUTPUT POWER
1
1.25 1.5 1.75
0.75
12 & 15 VOLT DUAL MODELS
EFFICIENCY vs LOAD
EFFICIENCY vs LOAD
EFFICIENCY vs LOAD
F
IGURE
3
F
IGURE
4
F
IGURE
5
0
20 V / div.
V
IN
20
ATTENUATION (dB)
50 VDC
100 mV / div.
12 VDC
FULL LOAD TO HALF LOAD
40
60
100 mV / div.
V
OUT
HALF LOAD TO FULL LOAD
80
100
1
10
60
FREQUENCY (kHz)
MCH2815S - Representative of all models
200µs / div.
MCH2805S
500µs / div.
MCH2805S
LINE TRANSIENT RESPONSE
LOAD TRANSIENT RESPONSE
AUDIO REJECTION
F
IGURE
6
F
IGURE
7
F
IGURE
8
20V/div.
V
IN
20 V / div.
V
IN
50 VDC
200 mV / div.
12 VDC
+V
OUT
FULL LOAD TO HALF LOAD
–V
OUT
HALF LOAD TO FULL LOAD
200 mV / div.
2V/div.
+V
OUT
–V
OUT
200µs / div.
MCH2815D
V
OUT
–V
OUT
FULL LOAD TO HALF LOAD
+V
OUT
HALF LOAD TO FULL LOAD
500µs / div.
MCH2815D
6
0
2
4
8
10 12 14 16 18
TIME (ms)
MCH2805S
Representative of all 5 volt models
LINE TRANSIENT RESPONSE
LOAD TRANSIENT RESPONSE
TURN-ON INTO FULL LOAD
F
IGURE
9
F
IGURE
10
F
IGURE
11
5
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