PD - 94542A
AHF2815T SERIES
28V Input, Triple Output
HYBRID-HIGH RELIABILITY
DC/DC CONVERTER
Description
The AHF2815T Series of DC/DC converters provide
8W of power and an extended temperature range for
use in military and industrial applications. Designed to
the nominal input requirements of MIL-STD-704, these
devices have nominal 28VDC inputs with +5V and ±15V
triple outputs to satisfy a wide range of requirements.
The basic circuit utilizes a pulse width modulated, feed
forward topology at a nominal switching frequency of
550KHz. Input to output isolation is achieved through
the use of transformers in the forward and feedback
circuits.
The proprietary magnetic feedback circuit provides for
an extremely wide bandwidth control loop with a high
phase margin. The closed loop frequency response of
this converter family extends to approximately 50KHz,
resulting in superior line and load transient characteristics.
This feedback method is also inherently temperature
and radiation insensitive. This gives the AHF Series
an important advantage over converters that incorporate opto-
couplers in their design.
Manufactured in a facility 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.
AHF
Features
16V to 40VDC Input Range (28VDC Nominal)
5V,
±
15V Output
Infinite Short Circuit and Overload Protection
8W Output Power
Fast Loop Response for Superior Transient
Characteristics
Operating Temperature Range from -55°C to
+125°C Available
Popular Industry Standard Pin-Out
Resistance Seam Welded Case for Superior
Long Term Hermeticity
Efficiency Up to 75%
Shutdown from External Signal
400,000 Hour MTBF at 85%
Constant Switching Frequency (550KHz Nominal)
Standard Microcircuit Drawing Available
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1
01/10/07
AHF2815T Series
Specifications
T
CASE
= -55°C to +125°C, V
IN
= +28V
±
5% unless otherwise specified
7
Typical Characteristics
Conversion frequency
550KHz
Recommended Operating temperature
Storage case temperature
-55°C to +125°C
-65°C to +135°C
Temperature Range
1
Test
Symbol
Conditions
-55°C
≤
Tc
≤
+125°C
Vin = 28 Vdc ±5%, C
L
= 0
7
unless otherwise specified
Unit
AHF2815T
Limits
Min
Max
5.05
5.10
±15.50
±15.65
1200
±66.7
60
80
5.0
1.5
1.5
8.0
25
±35
±75
50
±75
15
50
50
T
C
=
±25°C
T
C
=
±25°C
T
C
=
±25°C
500
9.0
68
100
8.0
6.0
600
13
35
V
V
V
V
mA
mA
mV p-p
mV p-p
W
W
W
W
STATIC
CHARACTERISTICS
1
Output voltage
V
OUT
I
OUT
= 0 (main)
I
OUT
= 0 (dual)
1
Current
1,2,3
Ripple Voltage
1,4
I
OUT
V
RIP
Power
1,2,3
P
OUT
V
IN
= 16, 28, and 40 Vdc (main)
V
IN
= 16, 28, and 40 Vdc (dual)
V
IN
= 16, 28, and 40 Vdc
BW = DC to 2 MHz (main)
V
IN
= 16, 28, and 40 VDC
BW = DC to 2 MHz (dual)
V
IN
= 16, 28, and 40 Vdc (main)
(+dual)
(-dual)
(total)
V
IN
= 16, 28, and 40 VDC
I
OUT
= 120, 600,1200 mA (main)
I
OUT
= 0,
±33.4, ±66.7
mA (dual)
V
IN
= 16, 28, and 40 VDC
I
OUT
= 120, 600, 1200mA (main)
I
OUT
= 0,
±33.4, ±66.7
mA (dual)
I
OUT
= 0, inhibit (pin 1)
tied to input return (pin 7)
I
OUT
= 0, inhibit (pin 1) = open
I
OUT
= 1200mA (main)
I
OUT
=
±66.7
mA (dual)
BW = DC to 2MHz
P
OUT
= Full load
Input to output or any pin
to case (except pin 6) at 500
V dc Tc = +25°C
5
Overload, T
C
=
±25°C
Short Circuit, T
C
=
±25°C
TC =
Over
TC =
Over
25°C
Temp
25°C
Temp
4.95
4.90
±14.50
±14.35
120
0.0
REGULATION
1,3
Line
VR
LINE
Load
1,3
VR
LOAD
T
C
= 25°C
Over Temp
mV
Input current
Ripple current
Efficiency
Isolation
Load fault power
dissipation
3
Switching frequency
Inhibit Open
Circuit Voltage
Weight
4
I
IN
I
RIP
E
FF
ISO
P
D
F
S
V
OI
mA
mA
mA p-p
%
MΩ
W
KHz
V
g
For Notes to Specifications, refer to page 3
2
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AHF2815T Series
Notes to Specifications
1.
2.
3.
4.
5.
6.
7.
Tested at each output.
Parameter guaranteed by line and load regulation tests.
At least 20percent of the total output power should be taken from the (+5.0 volt) main output.
Bandwidth guaranteed by design. Tested for 20KHz to 2.0MHz.
An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the
short circuit protection and is the condition of maximum power dissipation.
Above 125
°
C case temperature, derate output power linearly to 0 at 135
°
C case.
T
CASE
= -55
°
C to 85
°
C for non screened grade.
Block Diagram
2
+Input
8
EMI
Filter
Filter
&
Regulator
4
Case
6
Primary
Housekeeping
Supply
5
-Vout
+5Vout
+Vout
3
Inhibit Input
1
Drive
Output
Return
Pulse Width
FB
Modulator
CS
Error
Amp &
Ref
Input Return
7
Application Information
Inhibit Function
Connecting the inhibit input (Pin 1) to input common (Pin 7)
will cause the converter to shut down. It is recommended
that the inhibit pin be driven by an open collector device
capable of sinking at least 400µA of current. The open
circuit voltage of the inhibit input is 11.5 ± 1.0VDC.
The total surface area of the AHF package is 4.9 square
inches. If a worse case full load efficiency of 75% is
assumed, then the case temperature rise can be
calculated as follows:
Thermal Management
Assuming that there is no forced air flow, the package
temperature rise above ambient (∆T) may be calculated
using the following expression:
⎤
⎡
1
⎤
⎡
1
P
=
P
OUT
⎢
−
1
⎥
=
2.66
W
−
1
⎥
=
8
⎢
⎣
.78
⎦
⎦
⎣
Eff
∆T
= 80 (4.9)
-0.7
(2.66)
0.85
= 60.4°C
∆T
= 80 A
–0.7
p
0.85
(°C)
Hence, if T
AMBIENT
= +25°C, the DC/DC converter case
temperature will be approximately 85°C if no heat sink or air
flow is provided.
where A = the effective surface area in square inhes (including
heat sink if used), P = power dissipation in watts.
Standard Microcircuit Drawing Equivalence Table
Standard Microcircuit
Drawing Number
5962-94623
Vendor Cage
Code
52467
IR Standard
Part Number
AHF2815T
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3
AHF2815T Series
Mechanical Outlines
Standard
0.030 dia., 8 pins
(0.760)
0.205
(5.21)
8
1
2
0.905
(22.99)
1.105
(28.07)
1.450
(36.83)
0.705
(17.91)
0.505
(12.83)
7
3
4
6
5
0.800
(20.32)
1.120
(28.45)
0.090 R Typ
(2.290)
0.260
(6.600)
0.330
(8.380)
MAX
Flanged
Pin Designation
Pin #
1
2
3
4
5
6
7
8
Designation
Inhibit Input
+ Dual Output
+5V Output Return
- Dual Output
+5V Output
Case Ground
Input Return
+Input
4
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AHF2815T Series
Device Screening
Requirement
Temperature Range
Element Evaluation
Non-Destructive
Bond Pull
Internal Visual
Temperature Cycle
Constant Acceleration
PIND
Burn-In
Final Electrical
( Group A )
PDA
Seal, Fine and Gross
Radiographic
External Visual
MIL-PRF-38534
2023
2017
1010
2001, Y1 Axis
2020
1015
MIL-PRF-38534
& Specification
MIL-PRF-38534
1014
2012
2009
N/A
Cond A
N/A
N/A
Cond A, C
N/A
Yes
N/A
N/A
N/A
N/A
25°C
MIL-STD-883 Method
No Suffix
N/A
N/A
ES
N/A
N/A
Yes
Cond B
500 Gs
N/A
48 hrs@hi temp
25°C
HB
N/A
N/A
Yes
Cond C
3000 Gs
N/A
-55°C, +25°C,
+125°C
N/A
Cond A, C
N/A
Yes
CH
Class H
N/A
Yes
Cond C
3000 Gs
N/A
-55°C, +25°C,
+125°C
10%
Cond A, C
N/A
Yes
-20°C to +85°C -55°C to +125°C
-55°C to +125°C -55°C to +125°C
160 hrs@125°C 160 hrs@125°C
Notes:
Best commercial practice
Sample tests at low and high temperatures
-55°C to +105°C for AHE, ATO, ATW
Part Numbering
AHF 28 15 T F /CH
Model
Input Voltage
Nominal
28 = 28V
Screening Level
(Please refer to Screening Table)
No Suffix, ES, HB, CH
Package Options
F = Flange
Blank = Non-Flanged
Output Voltage
15 = 5V,±15V
Output
T = Triple
WORLD HEADQUARTERS:
233 Kansas St., El Segundo, California 90245, Tel: (310) 252-7105
IR SANTA CLARA:
2270 Martin Av., Santa Clara, California 95050, Tel: (408) 727-0500
Visit us at www.irf.com for sales contact information.
Data and specifications subject to change without notice. 01/2007
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