F
EATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
–55°C to +125° C operation
16 TO 40 VDC input
Four fully regulated outputs
Internal EMI filter meets
MIL-STD-461C CE03
Active transient suppressor
Built in hold-up function with flag
Fully isolated
Magnetic feedback
Fixed frequency, 550 kHz typical
Topology – Single Ended Forward
Inhibit function
Indefinite short circuit protection
Undervoltage lockout
DC/DC C
ONVERTERS
28 V
OLT
I
NPUT
MQO SERIES
16 WATT
MODELS
VDC O
UTPUT
QUAD
±5 and ±12
±5 and ±15
Size (max.): 3.200 x 2.600 x 0.460 inches (81.28 x 66.04 x 11.68 mm)
See Section B8, case N, for dimensions.
Weight:
120 grams typical
Screening: Standard or ES. See Section C2 for screening options,
see Section A5 for ordering information.
DESCRIPTION
The MQO Series™ of DC/DC converters supply up to 16.5 watts in
a four output configuration of ±5 and ±12 or ±5 and ±15 VDC. An
integral EMI filter and transient suppressor allow the converters to
meet MIL-STD-461C standards without external components. An
output hold-up feature provides a low power flag and full output
power hold-up through transient dropout conditions.
The MQO Series converters are packaged in hermetically sealed
cases and are rated for full power operation from –55° to +125° C
case temperature. This makes these units ideal for military, aero-
space, and hi-rel industrial applications.
A high gain bandwidth magnetically isolated control loop is used to
precisely regulate the +5 VDC output. Constant frequency pulse
width with a single ended forward topology is used. The –5 VDC
output and the auxiliary outputs are independently controlled with
low headroom regulators, eliminating cross regulation errors. The
use of feedforward, compensation, and a high gain bandwidth
control loop provides excellent rejection to the conducted audio
spectrum of MIL-STD-704A-D and MIL-STD-461C.
input power lines to allow meeting the CE03 interference and CS02
susceptibility requirements. The active internal transient suppressor
provides protection against MIL-STD-704A, 1275, and 461C line
transients. Protection is provided for transients up to 400 V from a
0.5 ohm source and 600 V from a 50 ohm source.
B
UILT
-I
N
H
OLD
-U
P
F
UNCTION WITH
F
LAG
An output hold-up feature provides a low power flag and full output
power hold-up through transient drop out conditions. At full load for
a Vin step from 28 to 0 volts, the minimum hold-up time will be 50
µs. The low power flag (TTL high) is asserted 10 µs before the end
of the hold-up time. External capacitance can be added to extend
hold-up time.
S
HORT
C
IRCUIT
P
ROTECTION
MQO Series converters provide predictable current limiters which
directly sense output load current in the converter’s secondary.
During short circuit or overload conditions, the current limiters
provide constant output current and an input power fold-back.
I
NTEGRAL
EMI F
ILTER
The MQO Series includes a a built-in EMI filter and transient
suppressor which allow the units to meet the most common military
standards without any external components. The internal EMI filter
provides both differential and common mode attenuation on the
U
NDERVOLTAGE
L
OCKOUT
Undervoltage lockout prevents the converters from operating below
approximately 12 VDC input voltage which helps keep system
current levels smooth, especially during initialization or re-start oper-
ations.
B2-53
MQO SERIES
16 WATT
ABSOLUTE MAXIMUM RATINGS
Input Voltage
• 16 to 40 V
Output Power
• 16.75 watts
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)
• Referenced to input common
• Logic high (output enabled)
Open collector
TYPICAL CHARACTERISTICS
Undervoltage Lockout
• 12 V input typical
Isolation
• 100 megohm minimum at 500 V
Audio Rejection
• Up to 50 dB
Conversion Frequency
• 550 kHz typical
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 16 to 40 VDC continuous
Case Operating Temperature (Tc)
• –55°C to +125°C full power
• –55°C to +135°C absolute
Derating Output Power/Current
• Linearly from 100% at 125°C to 0% at 135°C
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
MQO28512Q
TYP
5.00
5.00
12.00
12.00
—
—
—
—
—
—
—
—
50
—
—
—
—
—
20
50
MQO28515Q
TYP
5.00
5.00
15.00
15.00
—
—
—
—
—
—
—
—
50
—
—
—
—
—
20
50
PARAMETER
OUTPUT VOLTAGE
CONDITION
+5
–5
+ AUX.
– AUX.
+5
–5
+ AUX.
– AUX.
+5
–5
+ AUX.
– AUX.
+5
–5
+ AUX.
– AUX.
V
IN
= 16 TO 36 VDC
+5
–5, ±AUX.
MINIMUM LOAD TO FULL ±5
± AUX.
MINIMUM LOAD TO FULL
Tc = –55° TO +125° C
CONTINUOUS
TRANSIENT 50 ms
0.5 OHM SOURCE
50 OHM SOURCE
MINIMUM LOAD
FULL LOAD
INHIBITED
10 kHz TO 2 MHz
DELAY
OUTPUT CURRENT
OUTPUT POWER
V
IN
= 16 TO 40 VDC
OUTPUT RIPPLE
10 kHz to 2 MHz
LINE REGULATION
LOAD REGULATION
INPUT VOLTAGE
MIN
4.95
4.95
11.90
11.90
390
0
0
0
1.95
0
0
0
—
—
—
—
—
—
—
—
MAX
5.05
5.05
12.10
12.10
2000
350
208
208
10.00
1.75
2.50
2.50
55
30
50
50
20
50
120
220
MIN
4.95
4.95
14.90
14.90
390
0
0
0
1.95
0
0
0
—
—
—
—
—
—
—
—
MAX
5.05
5.05
15.10
15.10
2000
350
167
167
10.00
1.75
2.50
2.50
55
30
50
50
20
50
120
220
UNITS
VDC
mA
W
mV p-p
mV
mV
16
—
—
—
—
—
—
—
—
28
—
—
—
—
—
50
64
20
40
400
600
230
960
10
—
—
—
16
—
—
—
—
—
—
—
—
28
—
—
—
—
—
50
64
20
40
400
600
230
960
10
—
—
—
VDC
V
INPUT CURRENT
mA
mA p-p
%
ms
INPUT RIPPLE
EFFICIENCY
START-UP
B2-54
Positive
Input
Rectifier
and
Filters
600 kHz
Controller
LHR
Regulators
Inhibit
Voltage
Regulator
and Control
8
10
6
4
5, 9
Positive Aux. Output
Negative Aux. Output
Negative 5 V Output
Positive 5 V Output
Output Common
Ref. AMP
and Ref.
Input
Common
Transient Suppressor
EMI Filter
DC/DC C
ONVERTERS
F
IGURE
1: MQO B
LOCK
D
IAGRAM
4 Output Power Converter
MQO SERIES
16 WATT
B2-55
MQO SERIES
16 WATT
PIN OUT
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
DC/DC C
ONVERTERS
Designation
Inhibit
Positive Input
Input Common
Positive 5 V Output
Output Common
Negative 5 V Output
Low Power Flag
Positive Aux.Output
Output Common
Negative Aux. Output
Hold-up Common
Positive Hold-up Input
Case Ground
1
2
3
4
5
BOTTOM VIEW
MQO
11
13
12
6
7
8
9
10
See Section B8, case N, for dimensions
F
IGURE
2: P
IN
O
UT
MODEL NUMBERING KEY
MQO
Base Model
Input Voltage
Output Voltage
(Main and aux. Vout)
Number of Outputs
(Q = quad)
Screening
(Standard screening has no designator
in this position.)
28 512 Q / ES
B2-56
23624-001-DTS Rev A
DQ# 3003
All technical information is believed to be accurate, but no responsibility is
assumed for errors or omissions. Interpoint reserves the right to make changes in
products or specifications without notice. MQO Series is a trademark of Interpoint.
Copyright © 1991 - 1999 Interpoint. All rights reserved.
CASE N
C
ASES
2.600 max
(66.04)
CASE N TOP VIEW
Cover Placement
and
Min/Max Dimensions
See Figure 53
for pin configuration
3.200 max (81.28)
Materials
Header Cold Rolled Steel/Nickel/Tin
Cover Cold Rolled Steel/Nickel/Tin
Pins
#52 alloy (all cases)
compression glass seal
Case dimensions in inches (mm)
Tolerance
±0.005
(0.13) for three decimal places
±0.01
(0.2) for two decimal places
unless otherwise specified
CAUTION
Heat from reflow or wave soldering may damage
the device. Solder pins individually with heat
application not exceeding 300°C for 10 seconds
per pin.
F
IGURE
52: C
ASE
N M
AXIMUM
D
IMENSIONS
B8-34
