AFL2800D Series
Dual Output, Hybrid - High Reliability
DC/DC Converters
DESCRIPTION
The AFL Series of DC/DC converters feature high power density
with no derating over the full military temperature range. This
series is offered as part of a complete family of converters
providing single and dual output voltages and operating from
nominal +28 or +270 volt inputs with output power ranging from
80 to 120 watts. For applications requiring higher output power,
individual converters can be operated in parallel. The internal
current sharing circuits assure accurate current distribution
among the paralleled converters. This series incorporates Lambda
Advanced Analog’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 550
KHz. Multiple converters can be synchronized to a system clock
in the 500 KHz to 700 KHz 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.
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
Lambda Advanced Analog’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 available in four screening grades to satisfy
a wide range of requirements. The CH grade is fully compliant
to the requirements of MIL-H-38534 for class H. The HB grade
is processed and screened to the class H requirement, but may
not necessarily meet all of the other MIL-PRF-38534 requirements,
e.g., element evaluation and Periodic Inspections (PI) not required.
Both grades are tested to meet the complete group “A” test
specification over the full military temperature range without
output power deration. Two grades with more limited screening
are also available for use in less demanding applications.
Variations in electrical, mechanical and screening can be
accommodated. Contact Lambda Advanced Analog with specific
requirements.
FEATURES
n
16 To 40 Volt Input Range
n
±
5,
±
12, and
±
15 Volt Outputs Available
n
High Power Density - up to 70 W / in3
n
Up To 100 Watt Output Power
n
Parallel Operation with Power Sharing
n
Low Profile (0.380") Seam Welded Package
n
Ceramic Feedthru Copper Core Pins
n
High Efficiency - to 85%
n
Full Military Temperature Range
n
Continuous Short Circuit and Overload Protection
n
Output Voltage Trim
n
Primary and Secondary Referenced Inhibit Functions
n
Line Rejection > 40 dB - DC to 50Khz
n
External Synchronization Port
n
Fault Tolerant Design
n
Single Output Versions Available
n
Standard Microcircuit Drawings Available
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Soldering Temperature
Case Temperature
-0.5V to 50V
300°C for 10 seconds
Operating
-55°C to +125°C
Storage
-65°C to +135°C
AFL28XXD
Static Characteristics
-55°C
≤
TCASE
≤
+125°C, 160
≤
VIN
≤
400 unless otherwise specified.
Pa r a me t e r
INPUT VOLTAGE
OUTPUT VOLTAGE
AFL2805D
AFL2812D
AFL2815D
1
1
1
1
1
1
2,3
2,3
2,3
2,3
2,3
2,3
Gr oup A
Subgr oup
Note 6
Vin = 28 Volts, 100% Load
Positive Output
Negative Output
Positive Output
Negative Output
Positive Output
Negative Output
Positive Output
Negative Output
Positive Output
Negative Output
Positive Output
Negative Output
Vin = 16, 28, 40 Volts- Note 6, 11
AFL2805D
AFL2812D
AFL2815D
OUTPUT POWER
AFL2805D
AFL2812D
AFL2815D
MAXIMUM CAPACITIVE LOAD
OUTPUT VOLTAGE
TEMPERATURE COEFFICIENT
OUTPUT VOLTAGE REGULATION
Line
Load
1,2,3
1,2,3
Each Output Note 1
Vin = 28 Volts, 100% Load- Note 1,6
Note 10
No Load, 50% Load, 100% Load
Vin = 16, 28, 40 Volts
Vin = 16, 28, 40 Volts. Note 12
Cross
AFL2805D
AFL2812D
AFL2815D
OUTPUT RIPPLE VOLTAGE
AFL2805D
AFL2812D
AFL2815D
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3,
1, 2 , 3
Positive Output
Negative Output
Positive Output
Negative Output
Positive Output
Negative Output
Vin = 16, 28, 40 Volts, 100% Load,
BW = 10MHz
60
80
80
mVpp
mVpp
mVpp
- 1.0
- 8.0
- 1. 0
- 5.0
- 1. 0
- 5.0
+1.0
+8.0
+1.0
+5.0
+1.0
+5.0
%
%
%
%
%
%
- 0.5
- 1. 0
+0.5
+1.0
%
%
Either Output
Either Output
Either Output
Total of Both Outputs. Note 6, 11
80
96
10 0
10,000
- 0.015
+0.015
W
W
W
ufd
%/°C
12 . 8
6.4
5.3
A
A
A
4.95
- 5.05
11.88
- 12 . 12
14.85
- 15.15
4.90
- 5.10
11.76
- 12.24
14.70
- 15.30
5
-5
12
- 12
15
- 15
5.05
- 4.95
12.12
- 11.88
15.15
- 14.85
5.10
- 4.90
12.24
- 11.76
15.30
- 14 . 7 0
V
V
V
V
V
V
V
V
V
V
V
V
Te s t Condit ions
M in
16
N om
28
M ax
40
Unit
V
AFL2805D
AFL2812D
AFL2815D
OUTPUT CURRENT
2
Static Characteristics
(continued)
Pa r a me t e r
IN PUT CURREN T
N o Load
Inhibit 1
Inhibit 2
AFL2805D
AFL2812D, 15D
IN PUT RIPPLE CURREN T
AFL2805D
AFL2812D
AFL2815D
CURREN T LIMIT PO IN T
Expressed as a Percentage
of Full Rated Load
LO AD FAULT PO WER DISSIPATIO N
O verload or Short Circuit
EFFICIEN CY
AFL2805D
AFL2812D
AFL2815D
EN ABLE IN PUTS (Inhibit Function)
Converter O ff
Sink Current
Converter O n
Sink Current
SWITCHIN G FREQ UEN CY
SYN CHRO N IZATIO N IN PUT
Frequency Range
Pulse Amplitude, Hi
Pulse Amplitude, Lo
Pulse Rise Time
Pulse Duty Cycle
ISO LATIO N
DEVICE WEIGHT
MTBF
1,2,3
1,2,3
1,2,3
1
2
3
1,2,3
1,2,3
1,2,3
1, 2 , 3
Vout - 90% Vnom, Current split equally
on positive and negative outputs. N ote 5
1
2,3
1,2,3
1,2,3
1,2,3
1,2,3
G r oup A
Subgr oup
Te s t Condit ions
Vin = 28 Volts
Iout = 0
Pin 4 Shorted to Pin 2
Pin 12 Shorted to Pin 8
M in
N om
M ax
Unit
80
100
5
5
50
30
mA
mA
mA
mA
mA
mA
Vin = 28 Volts, 100% Load
BW = 10MHz
60
60
60
mApp
mApp
mApp
115
10 5
12 5
125
115
140
33
%
%
%
W
Vin = 28 Volts
Vin = 28 Volts, 100% Load
78
80
81
81
84
85
%
%
%
1,2,3
1,2,3
Logical Low, Pin 4 or Pin 12
N ote 1
Logical High, Pin 4 and Pin 12- N ote 9
N ote 1
- 0.5
2.0
0.8
100
50
100
550
600
700
10
0.8
100
80
V
uA
V
uA
K Hz
K Hz
V
V
nSec
%
M
Ω
1, 2 , 3
1,2,3
1,2,3
1,2,3
N ote 1
N ote 1
1
Input to O utput or Any Pin to Case
(except Pin 3). Test @ 500VDC
Slight Variations with Case Style
MIL- HDBK - 217, AIF @ Tc = 70°C
500
500
2.0
- 0.5
20
100
85
300
gms
K Hrs
3
Dynamic Characteristics
-55°C≤ TCASE
≤
+125°C, VIN = 28 Volts unless otherwise specified.
≤
Parameter
LO AD TRAN SIEN T RESPO N SE
AFL2805D
Positive O utput Amplitude
Recovery
Amplitude
Recovery
AFL2805D
N egative O utput Amplitude
Recovery
Amplitude
Recovery
AFL2812D
Positive O utput Amplitude
Recovery
Amplitude
Recovery
AFL2812D
N egative O utput Amplitude
Recovery
Amplitude
Recovery
AFL2815D
Positive O utput Amplitude
Recovery
Amplitude
Recovery
AFL2815D
N egative O utput Amplitude
Recovery
Amplitude
Recovery
LIN E TRAN SIEN T RESPO N SE
Amplitude
Recovery
TURN - O N CHARACTERISTICS
O vershoot
Delay
LO AD FAULT RECO VERY
LIN E REJECTIO N
4,5,6
4,5,6
Group A
Subgroups
N ote 2, 8
4,5,6
4,5,6
4,5,6
4,5,6
Load Step 50% <=> 100%
- 450
450
200
450
200
400
450
200
450
200
400
750
200
750
200
400
750
200
750
200
400
750
200
750
200
400
750
200
750
200
400
mV
uSec
mV
uSec
uSec
mV
uSec
mV
uSec
uSec
mV
uSec
mV
uSec
uSec
mV
uSec
mV
uSec
uSec
mV
uSec
mV
uSec
uSec
mV
uSec
mV
uSec
uSec
Test Conditions
Min
N om
Max
Unit
Load Step 10% <=> 50%
10% => 50%
50% => 10%
Load Step 50% <=> 100%
- 450
4,5,6
4,5,6
4,5,6
4,5,6
- 450
Load Step 10% <=> 50%
10% => 50%
50% => 10%
Load Step 50% <=> 100%
- 450
4,5,6
4,5,6
4,5,6
4,5,6
- 750
Load Step 10% <=> 50%
10% => 50%
50% => 10%
Load Step 50% <=> 100%
- 750
4,5,6
4,5,6
4,5,6
4,5,6
- 750
Load Step 10% <=> 50%
10% => 50%
50% => 10%
Load Step 50% <=> 100%
- 750
4,5,6
4,5,6
4,5,6
4,5,6
- 750
Load Step 10% <=> 50%
10% => 50%
50% => 10%
Load Step 50% <=> 100%
- 750
4,5,6
4,5,6
4,5,6
4,5,6
- 750
Load Step 10% <=> 50%
10% => 50%
50% => 10%
N ote 1,2,3
Vin Step = 16 <=> 40 Volts
N ote 4
Enable 1,2 on. (Pins 4, 12 high or open)
- 750
- 500
500
500
mV
uSec
0
Same as Turn O n Characteristics.
MIL- STD- 461D, CS101, 30Hz to 50K Hz
N ote 1
40
4
250
10
mV
mSec
50
dB
Notes to Specifications:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
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%
of VOUT at 50% load.
Line transient transition time
≥
100
µSec.
Turn-on delay is measured with an input voltage rise time of between 100 and 500 volts per millisecond.
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
≥
10
µSec.
Enable inputs internally pulled high. Nominal open circuit voltage
≈
4.0VDC.
Load current split equally between +Vout and -Vout.
Output load must be distributed so that a minimum of 20% of the total output power is being provided by one of the outputs.
Cross regulation measured with load on tested output at 20% while changing the load on other output from 20% to 80%.
AFL2800D Case Outlines
Case X
Case W
Pin Variation of Case Y
3.000
0.050
ø 0.128
2.760
0.050
0.250
0.250
12
1
1.260 1.500
1.000
Ref
1.000
0.200 Typ
Non-cum
Pin
ø 0.040
7
0.25 typ
12
7
6
Pin
ø 0.040
0.220
2.800
2.500
0.220
2.975 max
0.238 max
0.380
Max
0.525
0.42
0.380
Max
Case Y
Case Z
Pin Variation of Case Y
0.050
1.150
0.300
ø 0.140
0.050
0.250
0.250
1
6
1.000
Ref
0.200 Typ
Non-cum
Pin
ø 0.040
1.500 1.750 2.00
1.000
Ref
Pin
ø 0.040
0.220
0.36
2.800
0.525
1.750
2.500
2.975 max
0.238 max
0.375
0.220
0.380
Max
0.380
Max
Tolerances, unless otherwise specified:
.XX =
±0.010
.XXX =
±0.005
Embedded System
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