F
EATURES
•
•
•
•
•
•
•
•
•
•
–55° to +125°C operation
16 to 40 VDC input
Fully Isolated
Optocoupler feedback
Fixed frequency 550 kHz typical
Topology – Single Ended Flyback
50 V for up to 50 ms transient protection
Inhibit function
Indefinite short circuit protection
Up to 74% efficiency
DC/DC C
ONVERTERS
28 V
OLT
I
NPUT
MGA SERIES
5 WATT
MODELS
VDC O
UTPUT
SINGLE
5
12
15
DUAL
±5
±12
±15
Size (max.): 1.110 x 1.110 x 0.250 inches (28.19 x 28.19 x 6.35 mm)
Shown with “Gull Wing” lead option, also available with straight
leads. See Section B8, case D, for dimensions and options.
Weight:
15 grams maximum.
Screening: Standard, ES, or 883 (Class H). See Section B9 for
screening options, see Section A5 for ordering information.
DESCRIPTION
The MGA Series™ of DC/DC converters delivers 5 watts of output
power from a wide input voltage range of 16 to 40 VDC with up to
74% efficiency. Output models of 5, 12, 15, ±5, ±12 and ±15 VDC
meet a variety of system needs. All units withstand transients of up
to 50 V for up to 50 milliseconds and operate over the full military
temperature range of -55°C to +125°C.
a TTL low voltage (0.8 V or less) to the inhibit terminal (pin 1)
disables the output. Leaving the inhibit terminal unconnected or
connecting the inhibit terminal to an open collector gate enables the
output. The inhibit terminal has an open circuit voltage of 9 to 11 V.
In the inhibit mode the inhibit pin will source a maximum of 4 mA.
See “Inhibit Interface,” Figure 2.
C
ONVERTER
D
ESIGN
The MGA converters incorporate flyback topology with a typical
constant switching frequency of 500 kHz. Isolation between input
and output circuits is provided with a transformer in the forward path
and a temperature compensated optical link in the feedback control
loop. The feed-forward compensation design delivers an audio
rejection of 50 dB, typical, with input ripple as low as 50 mA p-p and
output ripple as low as 100 mV p-p. Output filter examples in Figures
3 and 4 provide suggested solutions for systems where very low
output ripple is required.
Tightly coupled magnetics minimize cross regulation in the MGA
dual output models. Either output can provide up to 80% of the total
available output power, providing the opposite output is carrying at
least 20% of the total output power.
The converter’s short circuit current protection restricts the output
current to approximately 115% of the full load output current.
MIL-STD-461
Use Interpoint’s FMGA-461 EMI filter to pass the CE03 require-
ments of MIL-STD-461C.
S
URFACE
M
OUNT
P
ACKAGE
The MGA DC/DC converters can be surface mounted with pick-and-
place equipment or manually. It is recommended that the case be
attached with flexible epoxy adhesive or silicone which is thermally
conductive (>1 watt /meter/°K).
Internal components are soldered with SN96 (melting temperature
221°C) to prevent damage during reflow. Maximum reflow tempera-
ture for surface mounting the MGA converter is 220°C for a
maximum of 30 seconds. SN60, 62, or 63 are the recommended
types of solder. Hand soldering should not exceed 300°C for 10
seconds per pin.
The hermetically sealed metal cases are available in two different
lead configurations. See Section B8, cases D1 and D2.
I
NHIBIT
F
UNCTION
The MGA converter’s inhibit terminal disables internal switching,
resulting in no output and very low quiescent input current. Applying
B2-81
MGA SERIES
5 WATT
ABSOLUTE MAXIMUM RATINGS
Input Voltage
• 16 to 40 V
Output Power
• 5 watts
Lead Soldering Temperature
• Reflow 220°C 30 sec. max
SN60, 62 or 63 recommended solder
• Hand solder 300°C 10 sec. max. per lead
Storage Temperature Range (Case)
• –65°C to +150°C
DC/DC C
ONVERTERS
INHIBIT
Inhibit: TTL Open Collector
• Logic low (output disabled)
Logic low voltage
≤0.8
V
• Referenced to input common
• Logic high (output enabled)
Open collector
TYPICAL CHARACTERISTICS
Output Voltage Temperature Coefficient
• 100 ppm/°C typ, 150 ppm/C max
Current Limit
• 115% of full load typical
Isolation
• Input to output
• Any pin to case except case pins
• 100 megohm minimum at 500 V
Conversion Frequency
• 500 kHz typical
450 kHz. min, 600 kHz max
Inhibit Pin Voltage (unit enabled)
• 9 to 11 V
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 16 to 40 VDC continuous
• 50 V for up to 50 msec transient
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
OUTPUT VOLTAGE
OUTPUT CURRENT
OUTPUT POWER
OUTPUT RIPPLE
LINE REGULATION
LOAD REGULATION
INPUT VOLTAGE
NO LOAD TO FULL
INPUT CURRENT
CONDITIONS
+V
OUT
V
IN
= 16 to 40 VDC
V
IN
= 16 to 40 VDC
10 kHz - 2 MHz
V
IN
= 16 to 40 VDC
NO LOAD TO FULL
CONTINUOUS
TRANSIENT 50 ms
NO LOAD
FULL LOAD
INHIBITED
INPUT RIPPLE
10 kHz - 10 MHz
EFFICIENCY
LOAD FAULT
1
SHORT CIRCUIT
POWER DISS.
RECOVERY
STEP LOAD
RESPONSE
2
STEP LINE
RESPONSE
4
START-UP
INHIBIT PIN
CURRENT
CAPACITANCE
CAPACITIVE LOAD
INHIBITED
INPUT TO OUTPUT
—
—
—
2.5
50
—
4.0
—
300
—
—
—
2.5
40
—
4.0
—
500
—
—
—
2.5
60
—
4.0
—
500
mA
pF
µF
50% – 100% – 50% LOAD
TRANSIENT
RECOVERY
3
16 – 40 – 16 VDC
TRANSIENT
RECOVERY
3
OVERSHOOT
DELAY
–500
—
0
0
100
.4
0
10
500
1.0
200
75
–800
—
0
0
200
0.5
0
10
800
1.3
500
30
–500
—
0
0
100
0.5
0
10
500
1.3
500
30
mV pk
ms
mV pk
ms
–500
—
200
200
500
500
–750
—
300
400
750
1000
–1000
—
400
400
1000
1000
mV pk
µs
—
—
1.5
10
2.0
75
—
—
1.2
10
1.9
30
—
—
1.2
10
1.8
30
W
ms
Tc = 25°C
Tc = –55°C to +125°C
MIN
4.95
0
—
—
—
—
16
—
—
—
—
—
—
64
MGA2805S
TYP
5.0
—
—
250
10
10
28
—
27
—
3
50
75
69
MAX
5.05
1000
5
450
50
50
40
50
60
279
4
200
300
—
MIN
11.88
0
—
—
—
—
16
—
—
—
—
—
—
68
MGA2812S
TYP
12
—
—
100
10
10
28
—
29
—
3
50
75
74
MAX
417
5
500
50
50
40
50
60
263
4
200
300
—
MIN
0
—
—
—
—
16
—
—
—
—
—
—
69
MGA2815S
TYP
15
—
—
100
10
10
28
—
31
—
3
50
75
74
MAX
15.15
333
5
600
50
50
40
50
60
259
4
200
300
—
%
mA p-p
mA
UNITS
VDC
mA
W
mV p-p
mV
mV
VDC
V
12.12 14.85
Notes
1. Indefinite short circuit protection not guaranteed above 125°C (case).
2. Load transient transition time is >10 µs.
3. Recovery time is measured from application of the transient to the point at
which Vout is within regulation.
4. Input step transition time is >10µs.
B2-82
DC/DC C
ONVERTERS
DUAL OUTPUT MODELS
PARAMETER
OUTPUT VOLTAGE
CONDITIONS
+V
OUT
–V
OUT
OUTPUT CURRENT
OUTPUT POWER
1
OUTPUT RIPPLE
2
LINE REGULATION
V
IN
= 16 to 40 VDC
LOAD REGULATION
NO LOAD TO FULL
CROSS REG.
3
INPUT VOLTAGE
NO LOAD TO FULL
INPUT CURRENT
V
IN
= 16 to 40 VDC
V
IN
= 16 to 40 VDC
10 kHz - 2 MHz
+V
OUT
–V
OUT
+V
OUT
(BALANCED)
–V
OUT
(BALANCED)
EFFECT ON –V
OUT
CONTINUOUS
TRANSIENT 50 ms
NO LOAD
FULL LOAD
INHIBITED
INPUT RIPPLE
10 kHz - 10 MHz
EFFICIENCY
LOAD FAULT
4
SHORT CIRCUIT
POWER DISS.
RECOVERY
STEP LOAD
RESP O N S E
5, 6
STEP LINE
RESP O N S E
8
TRANSIENT
RECOVERY
7
16 – 40 – 16 VDC
TRANSIENT
RECOVERY
7
START-UP
OVERSHOOT
DELAY
INHIBIT PIN
CURRENT
CAPACITANCE
CAPACITIVE LOAD
UNIT INHIBITED
INPUT TO OUTPUT
—
—
—
2.5
50
—
4.0
—
100
—
—
—
2.5
50
—
–500
—
0
0
100
0.8
200
10
500
2.0
500
30
–1500 200
—
0
0
1.6
200
10
—
—
–550
—
1.3
10
180
200
1.7
30
550
500
—
—
–600
—
1.3
10
180
200
Tc = 25°C
Tc = –55°C to +125°C
MGA2805D
MGA2812D
MIN
11.88
TYP MAX
12
12.12
MGA2815D
MIN
14.85
MGA SERIES
5 WATT
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
TYP MAX
15
15.15
UNITS
VDC
mA
W
mV p-p
mV
–11.76 –12 –12.24
0
—
—
—
—
—
—
—
16
—
—
±208 333
—
120
10
40
10
50
8
28
—
33
—
3
50
75
73
5
300
50
180
50
200
15
40
50
63
267
4
200
300
—
–14.70 –15 –15.30
0
—
—
—
—
—
—
—
16
—
—
—
—
—
—
68
±167
—
120
10
40
10
50
7
28
—
38
—
3
50
75
73
267
5
300
50
180
50
200
15=
40
50
63
263
4
200
300
—
%
mA p-p
mA
%
VDC
V
mV
A
VAILABLE
SOON
,
ASK YOUR
I
NTERPOINT REP
FOR INFORMA
-
TION
—
—
—
—
67
1.6
30
600
500
W
ms
mV pk
µs
1500
4.0
500
30
mV pk
ms
mV pk
ms
4.0
—
100
mA
pF
µF
Notes
1. Up to 4 watts, 80% of the total output power is available from either output
providing the opposite output is simultaneously carrying 20% of the total
output power. Each output must carry a minimum of 20% of the total output
power in order to maintain regulation on the negative output.
2. Applies to both +Vout and –Vout
3. Cross regulation is specified for the following percentages of total output
power: +PO = 20% and –PO = 80% to +PO =80% and –PO = 20%
4. Indefinite short circuit protection not guaranteed above 125°C (case).
5. Load transient transition time is >10 µs.
6. Response of either output when the load for each output is simultaneously
transitioned from 25% to 50% to 25% of total output power (5 watts).
7. Recovery time is measured from application of the transient to the point at
which Vout is within regulation.
8. Input step transition time is >10µs.
B2-83
MGA SERIES
5 WATT
Positive
Input
DC/DC C
ONVERTERS
DIAGRAMS AND CONNECTIONS
Positive
Output
+
Inhibit
PWM
Control
Error
Amp VR
Output
Common
+
Input
Common
Case
Ground
Isolated
Feedback
= Dual Output
Negative
Output
F
IGURE
1: B
LOCK
D
IAGRAM
MGA
Positive
Input
12 k
5k
F
IGURE
2: I
NHIBIT
I
NTERFACE
200 pF
10 K
Inhibit
400
50 k
2N3904
10V
Vcc
10 k
3.9 K
Input
Common
EMI Filter
Positive
Input
Input
Common
Positive
Output
MGA2815S
T1
C2
+
C3 To Load
From input
power source
Positive
Positive
Input
Output
Case
Output Common
Input
Output
Common
Common
Case
C1
T1
F
IGURE
3: L
OW
N
OISE
O
UTPUT
F
ILTER
MGA S
INGLE
O
UTPUT
M
ODEL
EMI Filter
Positive
Input
Positive
Output
MGA2815D
T1
C2
C4
+ C
3
+ C To Loads
5
From input
power source
Positive
Positive
Input
Output
Case
Output Common
Input
Output
Input
Negative
Common
Common Common
Output
Case
C1
The filter suggestions in Figures 3 and 4 will further
reduce the output ripple for systems requiring very low
output noise.
C1 = 0.27 µF ceramic capacitor, 500V
C2 = C4 = 6.8 µF tantalum capacitor
C3 = C5 = 0.27 µF ceramic capacitor
Single output: T1 = 15T #28 AWG winding on toroid,
m = 5000
Dual output: T2 = 10T #28 AWG winding on toroid,
m = 5000
T2
F
IGURE
4: L
OW
N
OISE
O
UTPUT
F
ILTER
MGA D
UAL
O
UTPUT
M
ODEL
B2-84
DC/DC C
ONVERTERS
Pin
1
2, 3
4
5, 6
7, 8
9, 10
11, 12
13
14
15, 16
17, 18
19, 20
Single Output
Inhibit
Positive Input
No connection
Input Common
Case Ground
No connection
Positive Output
Positive Output
Output Common
Output Common
No connection
Case Ground
Dual Output
Inhibit
Positive Input
No connection
Input Common
Case Ground
No connection
Positive Output
Output Common
Output Common
Negative Output
No connection
Case Ground
PIN OUT
1
2
3
4
5
6
7
8
9
10
MGA SERIES
5 WATT
20
19
18
17
16
15
14
13
12
11
TOP VIEW
MGA
Differently colored glass bead around pin one or dimple in
header (bottom of case) indicates pin one.
Cover marking is oriented with pin one at the upper right corner.
See Section B8, case D for dimensions and gull-wing lead option.
To meet specified performance, all pins must be
connected except “No Connection” pins.
F
IGURE
5: P
IN
O
UT
MODEL NUMBERING KEY
SMD NUMBERS
S
TANDARD
M
ICROCIRCUIT
D
RAWING
(SMD)
5962-9309201HXC
5962-9309301HXC
5962-9309401HXC
IN PROCESS
5962-9308901HXC
5962-9309001HXC
MGA S
ERIES
S
IMILAR
P
ART
MGA2805S/883
MGA2812S/883
MGA2815S/883
MGA2805D/883
MGA2812D/883
MGA2815D/883
MGA
Base Model
Input Voltage
Output Voltage
Number of Outputs
(S = single, D = dual)
28 12 S
Z / ES
Replace the “Y” with a “Z” in the SMD number to specify gull-wing leads.
For exact specifications for an SMD product, refer to the SMD drawing.
See Section A3, SMDs, for more information.
Gull Wing Lead Option
(Straight leaded case has no designator
in this position.)
Screening
(Standard screening has no designator
in this position.)
Typical Performance Curves: 25°C Tc , 28 VDC Vin, 100% load, unless otherwise specified.
80
16V
70
70
80
16V
70
28V
40V
50
80
16V
EFFICIENCY (%)
60
EFFICIENCY (%)
EFFICIENCY (%)
28V
40V
60
60
28V
40V
50
50
40
40
40
30
1
2
3
4
5
6
OUTPUT POWER (Watts)
30
1
2
3
4
5
6
OUTPUT POWER (Watts)
30
1
2
3
4
5
6
OUTPUT POWER (Watts)
MGA2805S
EFFICIENCY vs LINE & LOAD
MGA2812S
EFFICIENCY vs LINE & LOAD
MGA2815S
EFFICIENCY vs LINE & LOAD
F
IGURE
6
80
16V
70
F
IGURE
7
30
40
50
60
70
0.1
1
10
MGA2805S
0.1
F
IGURE
8
ATTENUATION (dB)
EFFICIENCY (%)
40
50
60
70
60
28V
50
40V
40
ATTENUATION (dB)
30
1
10
MGA2815D
30
1
2
3
4
5
6
OUTPUT POWER (Watts)
FREQUENCY (kHz)
FREQUENCY (kHz)
MGA2815D
EFFICIENCY vs LINE & LOAD
AUDIO REJECTION
AUDIO REJECTION
F
IGURE
9
F
IGURE
10
F
IGURE
11
B2-85
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