PD-97181C
HYBRID - HIGH RELIABILITY
DC/DC CONVERTER
Description
The AHP Series of DC/DC converters feature high power
density without derating over the full military temperature
range. This series is offered as lower cost alternatives to
the legendary AFL series with improved performance for
new design applications. The AHPs are form, fit and
functional replacement to the AFL series. The new AHP
series offers a full compliment of single and dual output
voltages operating from nominal +28V or +270V inputs
with output power ranging from 66W to 120W. For
applications requiring higher output power, multiple
converters can be operated in parallel. The internal current
sharing circuits assure equal current distribution among
the paralleled converters. Same as the AFL, the AHP
series incorporates International Rectifier’s proprietary
magnetic pulse feedback technology providing optimum
dynamic line and load regulation response. This feedback
system samples the output voltage at the pulse width
modulator fixed clock frequency, nominally 550KHz.
Multiple converters can be synchronized to a system clock
in the 500KHz to 700KHz range or to the synchronization
output of one converter. Undervoltage lockout, primary
and secondary referenced inhibit, soft-start and load fault
protection are provided on all models. Also included is
input over-voltage protection, a new protection feature
unique to
the AHP.
These converters are hermetically packaged in two
enclosure variations, utilizing copper core pins to minimize
resistive DC losses. Three lead styles are available, each
fabricated with International Rectifier’s rugged ceramic
lead-to-package seal assuring long term hermeticity in
the most harsh environments.
Manufactured in a facility fully qualified to MIL-PRF-
38534, these converters are fabricated utilizing DSCC
qualified processes. For available screening options,
refer to device screening table in the data sheet.
Variations in electrical, mechanical and screening can
be accommodated. Contact IR Santa Clara for special
requirements.
AHP270XXS SERIES
270V Input, Single Output
AHP
Features
n
160V To 400V Input Range
n
3.3V, 5V, 6V, 9V, 12V, 15V, 25V and 28V Outputs
Available
n
High Power Density - up to 84W/in3
n
Up To 120W Output Power
n
Parallel Operation with Stress and Current Sharing
n
Low Profile (0.380") Seam Welded Package
n
Ceramic Feed thru Copper Core Pins
n
High Efficiency - to 87%
n
Full Military Temperature Range
n
Continuous Short Circuit and Overload Protection
n
Remote Sensing Terminals
n
Primary and Secondary Referenced
Inhibit Functions
n
Line Rejection > 60dB - DC to 50KHz
n
External Synchronization Port
n
Fault Tolerant Design
n
Dual Output Versions Available
n
Standard Microcircuit Drawing Available
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1
01/16/07
AHP270XXS Series
Specifications
A bso lu te M axim u m R ating s
Input voltage
S oldering temperature
O perating case temperature
S torage case tem perature
-0.5V to +500V
300°C for 10 seconds
-55°C to +125°C
-65°C to +135°C
Static Characteristics
-55°C
≤
T
CASE
≤
+125°C, 160
≤
V
IN
≤
400 unless otherwise specified.
Parameter
INPUT VOLTAGE
OUTPUT VOLTAGE
AHP27003R3S
AHP27005S
AHP27006S
AHP27009S
AHP27012S
AHP27015S
AHP27025S
AHP27028S
AHP27003R3S
AHP27005S
AHP27006S
AHP27009S
AHP27012S
AHP27015S
AHP27025S
AHP27028S
OUTPUT CURRENT
AHP27003R3S
AHP27005S
AHP27006S
AHP27009S
AHP27012S
AHP27015S
AHP27025S
AHP27028S
OUTPUT POWER
AHP27003R3S
AHP27005S
AHP27006S
AHP27009S
AHP27012S
AHP27015S
AHP27025S
AHP27028S
MAXIMUM CAPACITIVE LOAD
OUTPUT VOLTAGE
TEMPERATURE COEFFICIENT
OUTPUT VOLTAGE REGULATION
AHP27025S/ AHP27028S
Line
All Others
Line
Load
1, 2, 3
1, 2, 3
1, 2, 3
Note 1
VIN = 270 Volts, 100% Load–Notes1, 6
10,000
-0.015
+0.015
1
1
1
1
1
1
1
1
2, 3
2, 3
2, 3
2, 3
2, 3
2, 3
2, 3
2, 3
VIN = 160, 270, 400 Volts - Note 6
20
16
13.5
10.0
9.0
8.0
4.0
4.0
Note 6
66
80
81
90
108
120
100
112
Group A
Subgroups
Note 6
VIN = 270 Volts, 100% Load
3.27
4.95
5.94
8.91
11.88
14.85
24.75
27.72
3.24
4.90
5.88
8.82
11.76
14.70
24.50
27.44
3.30
5.00
6.00
9.00
12.00
15.00
25.00
28.00
3.33
5.05
6.06
9.09
12.12
15.15
25.25
28.28
3.36
5.10
6.12
9.18
12.24
15.30
25.50
28.56
Test Conditions
Min
160
Nom
270
Max
400
Unit
V
V
A
W
µF
%/°C
No Load, 50% Load, 100% Load
VIN = 160, 270, 400 Volts – Note10
-100
-10
-1.0
+100
+10
+1.0
mV
mV
%
For Notes to Specifications, refer to page 4
2
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AHP270XXS Series
Static Characteristics
(Continued)
Parameter
OUTPUT RIPPLE VOLTAGE
AHP27003R3S
AHP27005S
AHP27006S
AHP27009S
AHP27012S
AHP27015S
AHP27025S/ AHP27028S
INPUT CURRENT
No Load
Inhibit 1
Inhibit 2
INPUT RIPPLE CURRENT
AHP27003R3S
AHP27005S
AHP27006S
AHP27009S
AHP27012S
AHP27015S
AHP27025S/ AHP27028S
CURRENT LIMIT POINT
Expressed as a Percentage
of Full Rated Load
LOAD FAULT POWER DISSIPATION
Overload or Short Circuit
EFFICIENCY
AHP27003R3S
AHP27005S
AHP27006S
AHP27009S
AHP27012S
AHP27015S
AHP27025S/ AHP27028S
ENABLE INPUTS
(Inhibit Function)
Converter Off
Sink Current
Converter On
Sink Current
SW ITCHING FREQUENCY
SYNCHRONIZATION INPUT
Frequency Range
Pulse Amplitude, Hi
Pulse Amplitude, Lo
Pulse Rise Time
Pulse Duty Cycle
ISOLATION
DEVICE WEIGHT
MTBF
1,
1,
1,
1,
1,
1,
1,
2,
2,
2,
2,
2,
2,
2,
3
3
3
3
3
3
3
1
2, 3
V
IN
= 270 Volts
V
IN
= 270 Volts, 100% Load
1
2, 3
1, 2, 3
1, 2, 3
1,
1,
1,
1,
1,
1,
1,
2,
2,
2,
2,
2,
2,
2,
3
3
3
3
3
3
3
Group A
Subgroups
1,
1,
1,
1,
1,
1,
1,
2,
2,
2,
2,
2,
2,
2,
3
3
3
3
3
3
3
Test Conditions
V IN = 160, 270, 400 Volts, 100% Load,
BW = 10MHz
Min
Nom
M ax
30
30
35
40
45
50
100
13
15
3.0
5.0
60
60
60
70
70
80
80
Unit
mV pp
V IN = 270 Volts
I OUT = 0
Pin 4 Shorted to Pin 2
Pin 12 Shorted to Pin 8
V IN = 270 Volts, 100% Load
B.W. = 10MHz
mA
mA pp
V OUT = 90% V NOM
- Note 5
115
105
125
125
%
1, 2, 3
33
72
78
79
80
82
83
82
76
82
83
84
85
87
85
W
%
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
Logical Low, Pin 4 or Pin 12
Note 1
Logical High, Pin 4 and Pin 12 - Note 9
Note 1
-0.5
2.0
500
500
2.0
-0.5
20
100
85
300
550
0.8
100
50
100
600
700
10
0.8
100
80
V
µA
V
µA
KHz
KHz
V
V
ns
%
M
Ω
g
KHrs
Note 1
Note 1
Input to Output or Any Pin to Case
(except Pin 3). Test @ 500VDC
Slight Variations with Case Style
MIL-HDBK-217F2, AIF @ T C = 40°C
1
For Notes to Specifications, refer to page 4
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3
AHP270XXS Series
Dynamic Characteristics
-55°C
≤
T
CASE
≤
+125°C, V
IN
=
270 Volts unless otherwise specified.
Param eter
LOAD TRANSIENT RESPONSE
AHP27003R3S
/
AHP27005S
Amplitude
Recovery
Amplitude
Recovery
AHP27006S
Amplitude
Recovery
Amplitude
Recovery
AHP27009S
Amplitude
Recovery
Amplitude
Recovery
AHP27012S
Amplitude
Recovery
Amplitude
Recovery
AHP27015S
Amplitude
Recovery
Amplitude
Recovery
AHP27025S
Amplitude
Recovery
Amplitude
Recovery
AHP27028S
Amplitude
Recovery
Amplitude
Recovery
LINE TRANSIENT RESPONSE
Amplitude
Recovery
TURN-ON CHARACTERISTICS
Overshoot
Delay
LOAD FAULT RECOVERY
LINE REJECTION
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
Group A
Subgroups
Test Conditions
Notes 2, 8
Load Step 50%
⇔
100%
Load Step 10%
⇔
50%
Load Step 50%
⇔
100%
Load Step 10%
⇔
50%
Load Step 50%
⇔
100%
Load Step 10%
⇔
50%
Load Step 50%
⇔
100%
Load Step 10%
⇔
50%
Load Step 50%
⇔
100%
Load Step 10%
⇔
50%
Load Step 50%
⇔
100%
Load Step 10%
⇔
50%
Load Step 50%
⇔
100%
Load Step 10%
⇔
50%
Notes 1, 2, 3
V IN Step = 160
⇔
400 Volts
Note 4
Enable 1, 2 on. (Pins 4, 12 high or
open)
Same as Turn On Characteristics.
MIL-STD-461, CS101, 30Hz to 50KHz
Note 1
60
70
dB
50
5.0
75
10
120
%
ms
-500
500
500
mV
µs
-450
-450
-450
-450
-600
-600
-750
-750
-900
-900
-1200
-1200
-1200
-1200
450
200
450
400
450
200
450
400
600
200
600
400
750
200
750
400
900
200
900
400
1200
200
1200
400
1200
200
1200
400
mV
µs
mV
µs
mV
µs
mV
µs
mV
µs
mV
µs
mV
µs
mV
µs
mV
µs
mV
µs
mV
µs
mV
µs
mV
µs
mV
µs
Min
Nom
Max
Unit
Notes to Specifications:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Parameters not 100% tested but are guaranteed to the limits specified in the table.
Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1.0 % of VOUT at 50% load.
Line transient transition time
≥100µs.
Turn-on delay is measured with an input voltage rise time of between 100V and 500V per ms.
Current limit point is that condition of excess load causing output voltage to drop to 90% of nominal.
Parameter verified as part of another test.
All electrical tests are performed with the remote sense leads connected to the output leads at the load.
Load transient transition time
≥10µs.
Enable inputs internally pulled high. Nominal open circuit voltage
≈
4.0VDC.
All tests at no-load are performed after start-up of the converter.
The converter may fail to start when the output load is less than 1.0W. Under these circumstances,
the converter’s start-up circuitry will continue to cycle until an adequate load is present.
4
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AHP270XXS Series
Circuit Description
Figure I. Single Output Block Diagram
+ INPUT
1
INPUT
FILTER
ENABLE 1
4
PRIMARY
BIAS SUPPLY
OUTPUT
FILTER
7
10
+ OUTPUT
+ SENSE
CURRENT
SENSE
SYNC OUTPUT
5
CONTROL
SYNC INPUT
6
ERROR
AMP
& REF
SHARE
AMPLIFIER
11
12
SENSE
AMPLIFIER
SHARE
ENABLE 2
CASE
3
9
8
SENSE RETURN
OUTPUT RETURN
INPUT RETURN
2
Circuit Operation and Application Information
The AHP series of converters employ a forward switched
mode converter topology. (refer to Figure I.) Operation of
the device is initiated when a DC voltage whose magnitude
is within the specified input limits is applied between pins 1
and 2. If pin 4 is enabled (at a logical 1 or open) the primary
bias supply will begin generating a regulated housekeeping
voltage bringing the circuitry on the primary side of the
converter to life. Two power MOSFETs used to chop the
DC input voltage into a high frequency square wave, apply
this chopped voltage to the power transformer. As this
switching is initiated, a voltage is impressed on a second
winding of the power transformer which is then rectified and
applied to the primary bias supply. When this occurs, the
input voltage is shut out and the primary bias voltage
becomes exclusively internally generated.
The switched voltage impressed on the secondary output
transformer winding is rectified and filtered to provide the
converter output voltage. An error amplifier on the secondary
side compares the output voltage to a precision reference
and generates an error signal proportional to the difference.
This error signal is magnetically coupled through the
feedback transformer into the controller section of the
converter varying the pulse width of the square wave signal
driving the MOSFETs, narrowing the width if the output
voltage is too high and widening it if it is too low.
leads should be connected to their respective output
terminals at the converter. Figure III. illustrates a typical
application.
Inhibiting Converter Output
As an alternative to application and removal of the DC
voltage to the input, the user can control the converter
output by providing TTL compatible, positive logic signals
to either of two enable pins (pin 4 or 12). The distinction
between these two signal ports is that enable 1 (pin 4) is
referenced to the input return (pin 2) while enable 2 (pin 12)
is referenced to the output return (pin 8). Thus, the user
has access to an inhibit function on either side of the isolation
barrier. Each port is internally pulled “high” so that when
not used, an open connection on both enable pins permits
normal converter operation. When their use is desired, a
logical “low” on either port will shut the converter down.
Figure II. Enable Input Equivalent Circuit
+5.6V
100K
Pin 4 or
Pin 12
1N4148
Remote Sensing
Connection of the
+
and
-
sense leads at a remotely located
load permits compensation for resistive voltage drop between
the converter output and the load when they are physically
separated by a significant distance. This connection allows
regulation to the placard voltage at the point of application.
When the remote sensing feature is not used, the sense
290K
2N3904
150K
Pin 2 or
Pin 8
Disable
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