AFL2828SY/CH [INFINEON]
28V Input, Single Output HYBRID-HIGH RELIABILITY DC/DC CONVERTER; 28V输入，单输出混合高可靠性DC / DC转换器
| 型号： | AFL2828SY/CH |
| 厂家： | 
Infineon |
| 描述： | 28V Input, Single Output HYBRID-HIGH RELIABILITY DC/DC CONVERTER |
| 文件： | 总12页 (文件大小：242K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PD-94460C
AFL28XXS SERIES
28V Input, Single Output
HYBRID-HIGH RELIABILITY
DC/DC CONVERTER
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 +28V or
+270V inputs with output power ranging from 80W to
120W. For applications requiring higher output power,
individual converters can be operated in parallel. The
internal current sharing circuits assure equal current
distribution among the paralleled converters. This 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.
AFL
Features
n 16V To 40V Input Range
n 5V, 7V, 8V, 9V,12V,15V and 28V Outputs
Available
n High Power Density - up to 84W/in
n Up To 120W 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
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n Primary and Secondary Referenced
Inhibit Functions
n Line Rejection > 40dB - DC to 50KHz
n External Synchronization Port
n Fault Tolerant Design
n Dual Output Versions Available
n Standard Microcircuit Drawings Available
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.
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1
12/18/06
AFL28XXS Series
Specifications
Absolute Maximum Ratings
Input voltage
-0.5V to +50VDC
300°C for 10 seconds
-55°C to +125°C
-65°C to +135°C
Soldering temperature
Operating case temperature
Storage case temperature
Static Characteristics -55°C < TCASE < +125°C, 16V< VIN < 40V unless otherwise specified.
Group A
Parameter
INPUT VOLTAGE
Subgroups
Test Conditions
Min
Nom
Max
Unit
Note 6
16
28
40
V
OUTPUT VOLTAGE
V
= 28 Volts, 100% Load
IN
AFL2805S
AFL2807S
AFL2808S
AFL2809S
AFL2812S
AFL2815S
AFL2828S
1
1
1
1
1
1
1
4.95
6.93
7.92
8.91
11.88
14.85
27.72
5.00
7.00
8.00
9.00
12.00
15.00
28.00
5.05
7.07
8.08
9.09
12.12
15.15
28.28
2, 3
4.90
6.86
7.84
8.82
11.76
14.70
27.44
5.10
7.17
8.16
9.18
12.24
15.30
28.56
V
AFL2805S
AFL2807S
AFL2808S
AFL2809S
AFL2812S
AFL2815S
AFL2828S
2, 3
2, 3
2, 3
2, 3
2, 3
2, 3
V
= 16, 28, 40 Volts - Note 6
OUTPUT CURRENT
IN
AFL2805S
AFL2807S
AFL2808S
AFL2809S
AFL2812S
AFL2815S
AFL2828S
16
11.4
10
10
A
9.0
8.0
4.0
OUTPUT POWER
Note 6
80
80
80
AFL2805S
AFL2807S
AFL2808S
AFL2809S
AFL2812S
AFL2815S
AFL2828S
90
W
108
120
112
MAXIMUM CAPACITIVE LOAD
Note 1
= 28 Volts, 100% Load - Note 1, 6
10,000
-0.015
µF
OUTPUT VOLTAGE
TEMPERATURE COEFFICIENT
V
+0.015
%/°C
IN
OUTPUT VOLTAGE REGULATION
1, 2, 3
1, 2, 3
No Load, 50% Load, 100% Load
-70
-20
+70
+20
mV
mV
AFL2828S
Line
Line
V
= 16, 28, 40 Volts
All Others
IN
1, 2, 3
-1.0
+1.0
%
Load
OUTPUT RIPPLE VOLTAGE
AFL2805S
V
= 16, 28, 40 Volts, 100% Load,
IN
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
30
40
40
40
45
BW = 10MHz
AFL2807S
AFL2808S
AFL2809S
AFL2812S
AFL2815S
AFL2828S
mV
pp
50
100
For Notes to Specifications, refer to page 4
2
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AFL28XXS Series
Static Characteristics (Continued)
Group A
Parameter
INPUT CURRENT
Subgroups
Test Conditions
= 28 Volts
Min
Nom
Max
Unit
V
IN
1
2, 3
1, 2, 3
1, 2, 3
80
100
5.0
50
No Load
I
= 0
OUT
mA
Inhibit 1
Inhibit 2
Pin 4 Shorted to Pin 2
Pin 12 Shorted to Pin 8
INPUT RIPPLE CURRENT
AFL2805S
V
= 28 Volts, 100% Load, BW = 10MHz
IN
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
60
60
60
60
60
60
60
AFL2807S
AFL2808S
AFL2809S
AFL2812S
AFL2815S
AFL2828S
mA
pp
CURRENT LIMIT POINT
V
= 90% V , V = 28 Volts
NOM IN
OUT
As a percentage of full rated load
Note 5
1
2
3
115
105
125
125
115
140
%
LOAD FAULT POWER DISSIPATION
VIN = 28 Volts
1, 2, 3
33
W
%
Overload or Short Circuit
EFFICIENCY
AFL2805S
AFL2807S
AFL2808S
AFL2809S
AFL2812S
AFL2815S
AFL2828S
VIN = 28 Volts, 100% Load
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
78
79
79
80
80
81
81
81
82
82
83
84
85
84
ENABLE INPUTS
(Inhibit Function)
Converter Off
Sink Current
Converter On
Sink Current
1, 2, 3
1, 2, 3
Logical Low on Pin 4 or Pin 12
Note 1
Logical High on Pin 4 and Pin 12 - Note 9
Note 1
-0.5
2.0
0.8
100
50
V
µA
V
100
µ
A
SWITCHING FREQUENCY
1, 2, 3
500
550
600
KHz
SYNCHRONIZATION INPUT
Frequency Range
1, 2, 3
1, 2, 3
1, 2, 3
500
2.0
-0.5
700
10
0.8
100
80
KHz
V
V
ns
%
Pulse Amplitude, Hi
Pulse Amplitude, Lo
Pulse Rise Time
Note 1
Note 1
20
Pulse Duty Cycle
ISOLATION
1
Input to Output or Any Pin to Case
(except Pin 3). Test @ 500VDC
100
MΩ
DEVICE WEIGHT
MTBF
Slight Variations with Case Style
85
g
MIL-HDBK-217F, AIF @ T = 70°C
300
KHrs
C
For Notes to Specifications, refer to page 4
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3
AFL28XXS Series
Dynamic Characteristics -55°C < TCASE < +125°C, VIN=28V unless otherwise specified.
Group A
Parameter
Subgroups
Test Conditions
Min
Nom
Max
Unit
LOAD TRANSIENT RESPONSE
Note 2, 8
⇔
4, 5, 6
4, 5, 6
Load Step 50%
100%
-450
-450
-500
-500
450
200
mV
µs
AFL2805S
AFL2807S
AFL2808S
AFL2809S
AFL2812S
AFL2815S
AFL2828S
Amplitude
Recovery
4, 5, 6
4, 5, 6
Load Step 10% ⇔ 50%
450
400
mV
Amplitude
Recovery
µ
s
⇔
4, 5, 6
4, 5, 6
Load Step 50%
100%
500
200
mV
µs
Amplitude
Recovery
4, 5, 6
4, 5, 6
Load Step 10% ⇔ 50%
500
400
mV
Amplitude
Recovery
µ
s
4, 5, 6
4, 5, 6
500
200
mV
µs
Amplitude
Recovery
Load Step 50% ⇔ 100%
Load Step 10% ⇔ 50%
Load Step 50% ⇔ 100%
Load Step 10% ⇔ 50%
Load Step 50% ⇔ 100%
Load Step 10% ⇔ 50%
-500
-500
-600
-600
-750
-750
-750
-750
-1200
-1200
4, 5, 6
4, 5, 6
500
400
mV
µs
Amplitude
Recovery
4, 5, 6
4, 5, 6
600
200
mV
µs
Amplitude
Recovery
4, 5, 6
4, 5, 6
600
400
mV
µs
Amplitude
Recovery
4, 5, 6
4, 5, 6
750
200
mV
µs
Amplitude
Recovery
4, 5, 6
4, 5, 6
750
400
mV
µs
Amplitude
Recovery
4, 5, 6
4, 5, 6
750
200
mV
µs
Amplitude
Recovery
⇔
Load Step 50%
100%
4, 5, 6
4, 5, 6
750
400
mV
µs
Amplitude
Recovery
Load Step 10% ⇔ 50%
4, 5, 6
4, 5, 6
1200
200
mV
µs
Amplitude
Recovery
⇔
Load Step 50%
100%
4, 5, 6
4, 5, 6
1200
400
mV
µs
Amplitude
Recovery
Load Step 10% ⇔ 50%
LINE TRANSIENT RESPONSE
Note 1, 2, 3
-500
500
500
mV
µs
Amplitude
Recovery
⇔
40 Volts
V
Step = 16
IN
TURN-ON CHARACTERISTICS
V
= 16, 28, 40 Volts. Note 4
IN
Overshoot
Delay
4, 5, 6
4, 5, 6
Enable 1, 2 on. (Pins 4, 12 high or
open)
250
10
mV
ms
0
4.0
50
LOAD FAULT RECOVERY
LINE REJECTION
Same as Turn On Characteristics.
MIL-STD-461D, CS101, 30Hz to 50KHz
Note 1
40
dB
Notes to Specifications:
1.
2.
3.
4.
5.
6.
7.
8.
9.
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 V
has returned to within ±1.0% of V at 50% load.
OUT
OUT
Line transient transition time ≥ 100µs.
Turn-on delay is measured with an input voltage rise time of between 100V and 500V 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 ≥ 10µs.
Enable inputs internally pulled high. Nominal open circuit voltage ≈ 4.0VDC.
4
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AFL28XXS Series
Block Diagram
Figure I. Single Output
Input
Filter
1
4
5
+ Input
Output
Filter
+Output
+Sense
7
Primary
Bias Supply
Enable 1
10
Current
Sense
Sync Output
Share
Amplifier
Control
11 Share
Error
Amp
& Ref
Sync Input
Case
6
3
2
Enable 2
FB
12
Sense
Amplifier
9
8
Sense Return
Output Return
Input Return
not used, the sense leads should be connected to their
respective output terminals at the converter. Figure III.
llustrates a typical remotely sensed application.
Circuit Operation and Application Information
The AFL 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. A power MOSFET is used to chop the DC
input voltage into a high frequency square wave, applying
this chopped voltage to the power transformer at the nominal
converter switching frequency. Maintaining a DC voltage
within the specified operating range at the input assures
continuous generation of the primary bias voltage.
Inhibiting Converter Output (Enable)
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.
The switched voltage impressed on the secondary output
transformer winding is rectified and filtered to generate the
converter DC 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 MOSFET, narrowing the width if the output voltage
is too high and widening it if it is too low, thereby regulating
the output voltage.
Figure II. Enable Input Equivalent Circuit
+5.6V
100K
1N4148
Pin 4 or
Pin 12
Disable
290K
Remote Sensing
2N3904
Connection of the + and - sense leads at a remotely located
load permits compensation for excessive resistance
between the converter output and the load when their
physical separation could cause undesirable voltage drop.
This connection allows regulation to the placard voltage at
the point of application. When the remote sensing feature is
150K
Pin 2 or
Pin 8
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5
AFL28XXS Series
Internally, these ports differ slightly in their function. In use,
a low on Enable 1 completely shuts down all circuits in the
converter, while a low on Enable 2 shuts down the secondary
side while altering the controller duty cycle to near zero.
Externally, the use of either port is transparent to the user
save for minor differences in stndby current. (See
specification table).
than 100ns, maximum low level of +0.8Vand a minimum
highvel of +2.0V. The sync output of another converter
which has been designated as the master oscillator provides
a convenient frequency source for this mode of operation.
When external synchronization is not required, the sync in
pin should be left open (unconnected )thereby permitting
the converter to operate at its’ own internally set frequency.
Synchronization of Multiple Converters
The sync output signal is a continuous pulse train set at
550 ± 50KHz, with a duty cycle of 15 ± 5%. This signal is
referenced to the input return and has been tailored to be
compatible with the AFL sync input port. Transition times
are less than 100ns and the low level output impedance is
less than 50Ω. This signal is active when the DC input
voltage is within the specified operating range and the
converter is not inhibited. This output has adequate drive
reserve to synchronize at least five additional converters.
A typical connection is illustrated in Figure III.
When operating multiple converters, system requirements
often dictate operation of the converters at a common
frequency. To accommodate this requirement, the AFL
series converters provide both a synchronization input and
a synchronization output.
The sync input port permits synchronization of an AFL
converter to any compatible external frequency source
operating between 500KHz and 700KHz. This input signal
should be referenced to the input return and have a 10% to
90% duty cycle. Compatibility requires transition times less
Figure III. Preferred Connection for Parallel Operation
1
12
Power
Input
Enable 2
Vin
Rtn
Share
+ Sense
- Sense
Return
Case
AFL
AFL
Enable 1
Sync Out
Sync In
+ Vout
7
6
1
Optional
Synchronization
Connection
Share Bus
12
Enable 2
Vin
Rtn
Share
+ Sense
- Sense
Case
Enable 1
Sync Out
Sync In
Return
to Load
+ Vout
7
6
1
12
Enable 2
Vin
Rtn
Share
+ Sense
- Sense
Return
Case
AFL
Enable 1
Sync Out
Sync In
+ Vout
7
6
(Other Converters)
Parallel Operation-Current and Stress Sharing
the AFL series operating in the parallel mode is that in addition
to sharing the current, the stress induced by temperature
will also be shared. Thus if one member of a paralleled set
is operating at a higher case temperature, the current it
provides to the load will be reduced as compensation for
the temperature induced stress on that device.
Figure III. illustrates the preferred connection scheme for
operation of a set of AFL converters with outputs operating
in parallel. Use of this connection permits equal sharing
among the members of a set whose load current exceeds
the capacity of an individual AFL. An important feature of
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AFL28XXS Series
A conservative aid to estimating the total heat sink surface
When operating in the shared mode, it is important that
symmetry of connection be maintained as an assurance of area (AHEAT SINK) required to set the maximum case
optimum load sharing performance. Thus, converter outputs temperature rise (∆T) above ambient temperature is given
by the following expression:
should be connected to the load with equal lengths of wire of
the same gauge and should be connected to a common
physical point, preferably at the load along with the converter
output and return leads. All converters in a paralleled set
must have their share pins connected together. This
arrangement is diagrammatically illustrated in Figure III
showing the output and return pins connected at a star
point which is located close as possible to the load.
−1.43
⎧
⎨
⎩
⎫
⎬
⎭
∆T
A
HEAT SINK
≈
− 3.0
0.85
80P
where
∆T = Case temperature rise above ambient
As a consequence of the topology utilized in the current
sharing circuit, the share pin may be used for other functions.
In applications requiring only a single converter, the voltage
appearing on the share pin may be used as a “current
monitor”. The share pin open circuit voltage is nominally
+1.00V at no load and increases linearly with increasing
total output current to +2.20V at full load.
⎧
⎨
⎩
⎫
⎭
1
⎬
−1
P = Device dissipation in Watts = POUT
Eff
As an example, it is desired to maintain the case temperature
of an AFL2815S at ≤ +85°C while operating in an open area
whose ambient temperature is held at a constant +25°C;
then
Thermal Considerations
∆T = 85 - 25 = 60°C
Because of the incorporation of many innovative
technological concepts, the AFL series of converters is
capable of providing very high output power from a package
of very small volume. These magnitudes of power density
can only be obtained by combining high circuit efficiency
with effective methods of heat removal from the die junctions.
This requirement has been effectively addressed inside the
device; but when operating at maximum loads, a significant
amount of heat will be generated and this heat must be
conducted away from the case. To maintain the case
temperature at or below the specified maximum of 125°C,
this heat must be transferred by conduction to an
appropriate heat dissipater held in intimate contact with the
converter base-plate.
From the Specification Table, the worst case full load
efficiency for this device is 83%; therefore the power
dissipation at full load is given by
⎧
⎨
⎫
⎭
1
⎩.83
⎬
(
)
P = 120•
− 1 = 120• 0.205 = 24.6W
and the required heat sink area is
−1.43
⎧
⎨
⎩
⎫
⎬
⎭
60
2
A
HEAT SINK
=
− 3.0 = 71in
Because the effectiveness of this heat transfer is dependent
on the intimacy of the baseplate/heatsink interface, it is
strongly recommended that a high thermal conductivity heat
transferring medium is inserted between the baseplate and
heatsink. The material most frequently utilized at the factory
during all testing and burn-in processes is sold under the
0.85
80 • 24.6
Thus, a total heat sink surface area (including fins, if any) of
71 in in this example, would limit case rise to 60°C above
ambient. A flat aluminum plate, 0.25" thick and of
approximate dimension 4" by 9" (36 in per side) would
suffice for this application in a still air environment. Note
that to meet the criteria in this example, both sides of the
plate require unrestricted exposure to the ambient air.
2
1
trade name of Sil-Pad® 400 . This particular product is an
2
insulator but electrically conductive versions are also
available. Use of these materials assures maximum surface
contact with the heat dissipater thereby compensating for
any minor surface variations. While other available types of
heat conductive materials and thermal compounds provide
similar effectiveness, these alternatives are often less
convenient and can be somewhat messy to use.
1
Sil-Pad is a registered Trade Mark of Bergquist, Minneapolis, MN
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7
AFL28XXS Series
Input Filter
Figure V. Connection for VOUT Adjustment
The AFL28XXS series converters incorporate a two stage
LC input filter whose elements dominate the input load
impedance characteristic during the turn-on. The input
circuit is as shown in Figure IV.
Enable 2
Share
RADJ
+ Sense
AFL28xxS
Figure IV. Input Filter Circuit
- Sense
Return
To Load
900nH
130nH
+ Vout
Pin 1
Pin 2
Note: Radj must be set ≥ 500Ω
Attempts to adjust the output voltage to a value greater than
120% of nominal should be avoided because of the potential
of exceeding internal component stress ratings and
subsequent operation to failure. Under no circumstance
should the external setting resistor be made less than 500Ω.
By remaining within this specified range of values, completely
safe operation fully within normal component derating limits
6 µfd
11.2 µfd
Undervoltage Lockout
is assured.
A minimum voltage is required at the input of the converter
to initiate operation. This voltage is set to 14V ± 0.5V. To
preclude the possibility of noise or other variations at the
input falsely initiating and halting converter operation, a
hysteresis of approximately 1.0V is incorporated in this
circuit. Thus if the input voltage droops to 13V ± 0.5V, the
converter will shut down and remain inoperative until the
input voltage returns to ≈14V.
Examination of the equation relating output voltage and
resistor value reveals a special benefit of the circuit topology
utilized for remote sensing of output voltage in the AFL28XXS
series of converters. It is apparent that as the resistance
increases, the output voltage approaches the nominal set
value of the device. In fact the calculated limiting value of
output voltage as the adjusting resistor becomes very large
is ≈ 25mV above nominal device voltage.
Output VoltageAdjust
The consequence is that if the +sense connection is
unintentionally broken, an AFL28XXS has a fail-safe output
voltage of Vout + 25mV, where the 25mV is independent of
the nominal output voltage. It can be further demonstrated
that in the event of both the + and - sense connections
being broken, the output will be limited to Vout + 440mV.
This 440mV is also essentially constant independent of the
In addition to permitting close voltage regulation of remotely
located loads, it is possible to utilize the converter sense
pins to incrementally increase the output voltage over a
limited range. The adjustments made possible by this method
are intended as a means to “trim” the output to a voltage
setting for some particular application, but are not intended
to create an adjustable output converter. These output
voltage setting variations are obtained by connecting an
appropriate resistor value between the +sense and -sense
pins while connecting the -sense pin to the output return pin
as shown in Figure V. below. The range of adjustment and
corresponding range of resistance values can be determined
nominal output voltage.
General Application Information
The AFL28XXS series of converters are capable of
providing large transient currents to user loads on demand.
Because the nominal input voltage range in this series is
relatively low, the resulting input current demands will be
correspondingly large. It is important therefore, that the line
impedance be kept very low to prevent steady state and
transient input currents from degrading the supply voltage
between the voltage source and the converter input. In
applications requiring high static currents and large
transients, it is recommended that the input leads be made
of adequate size to minimize resistive losses, and that a
good quality capacitor of approximately 100µfd be
connected directly across the input terminals to assure an
adequately low impedance at the input terminals. Table I
relates nominal resistance values and selected wire sizes.
by use of the following equation.
⎧
⎨
⎩
⎫
⎬
⎭
VNOM
Radj = 100•
VOUT - VNOM -.025
Where VNOM = device nominal output voltage, and
VOUT = desired output voltage
Finding a resistor value for a particular output voltage, is
simply a matter of substituting the desired output voltage
and the nominal device voltage into the equation and solving
for the corresponding resistor value.
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AFL28XXS Series
Table 1. Nominal Resistance of Cu Wire
Another potential problem resulting from parasitically
induced voltage drop on the input lines is with regard to
the operation of the enable 1 port. The minimum and
maximum operating levels required to operate this port
are specified with respect to the input common return line
at the converter. If a logic signal is generated with respect
to a ‘common’ that is distant from the converter, the effects
of the voltage drop over the return line must be considered
when establishing the worst case TTL switching levels.
These drops will effectively impart a shift to the logic levels.
In Figure VI, it can be seen that referred to system ground,
Wire Size, AWG
Resistance per ft
24 Ga
22 Ga
20 Ga
18 Ga
16 Ga
14 Ga
12 Ga
25.7 mΩ
16.2 mΩ
10.1 m
Ω
6.4 mΩ
4.0 mΩ
2.5 m
Ω
the voltage on the input return pin is given by
1.6 mΩ
As an example of the effects of parasitic resistance,
consider an AFL2815S operating at full power of 120W.
From the specification sheet, this device has a minimum
efficiency of 83% which represents an input power of more
than 145W. If we consider the case where line voltage is at
its’ minimum of 16V, the steady state input current necessary
for this example will be slightly greater than 9 amperes. If
this device were connected to a voltage source with 10
feet of 20 gauge wire, the round trip (input and return)
would result in 0.2Ω of resistance and 1.8V of drop from the
source to the converter. To assure 16V at the input, a
source closer to 18V would be required. In applications
using the paralleling option, this drop will be multiplied by
the number of paralleled devices. By choosing 14 or 16
gauge wire in this example, the parasitic resistance and
resulting voltage drop will be reduced to 25% or 31% of that
eRtn = IRtn • RP
Therefore, the logic signal level generated in the system
must be capable of a TTL logic high plus sufficient additional
amplitude to overcome eRtn. When the converter is inhibited,
IRtn diminishes to near zero and eRtn will then be at system
ground.
Incorporation of a 100µF capacitor at the input terminals is
recommended as compensation for the dynamic effects
of the parasitic resistance of the input cable reacting with
the complex impedance of the converter input, and to
provide an energy reservoir for transient input current
requirements.
with 20 gauge wire.
Figure VI. Problems of Parasitic Resistance in input Leads
(See text)
Rp
Rp
Iin
Vin
100
µfd
esource
Rtn
eRtn
IRtn
Case
Enable 1
Sync Out
Sync In
System Ground
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9
AFL28XXS Series
Mechanical Outlines
Case X
Case W
Pin Variation of Case Y
3.000
ø 0.128
2.760
0.050
0.050
0.250
0.250
1.000
1.000
Ref
1.260 1.500
0.200 Typ
Non-cum
Pin
ø 0.040
Pin
ø 0.040
0.220
2.500
0.220
0.525
2.800
2.975 max
0.238 max
0.42
0.380
Max
0.380
Max
Case Y
Case Z
Pin Variation of Case Y
0.300
ø 0.140
1.150
0.25 typ
0.050
0.050
0.250
0.250
1.000
Ref
1.500 1.750 2.00
1.000
Ref
0.200 Typ
Non-cum
Pin
ø 0.040
Pin
ø 0.040
0.220
0.220
1.750
2.500
0.375
0.36
2.800
2.975 max
0.525
0.238 max
0.380
Max
0.380
Max
Tolerances, unless otherwise specified: .XX
.XXX
=
=
±0.010
±0.005
BERYLLIAWARNING: These converters are hermetically sealed; however they contain BeO substrates and should not be ground or subjected to any other
operations including exposure to acids, which may produce Beryllium dust or fumes containing Beryllium
10
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AFL28XXS Series
Pin Designation
Pin #
Designation
1
2
+ Input
Input Return
Case Ground
Enable 1
3
4
5
Sync Output
Sync Input
+ Output
6
7
8
Output Return
Sense Return
+ Sense
9
10
11
12
Share
Enable 2
Standard Microcircuit Drawing Equivalence Table
Standard Microcircuit
Drawing Number
5962-94721
IR Standard
Part Number
AFL2805S
5962-96659
AFL2808S
5962-94772
AFL2812S
5962-94723
AFL2815S
5962-96899
AFL2828S
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11
AFL28XXS Series
Device Screening
Requirement
MIL-STD-883 Method No Suffix
ES
HB
CH
Temperature Range
Element Evaluation
Non-Destructive
Bond Pull
-20°C to +85°C -55°C to +125°C
-55°C to +125°C -55°C to +125°C
MIL-PRF-38534
2023
N/A
N/A
N/A
N/A
Class H
N/A
N/A
N/A
Internal Visual
Temperature Cycle
Constant Acceleration
PIND
2017
1010
Yes
Cond B
500 Gs
N/A
Yes
Cond C
3000 Gs
N/A
Yes
Cond C
3000 Gs
N/A
N/A
N/A
2001, Y1 Axis
2020
N/A
Burn-In
1015
N/A
48 hrs@hi temp 160 hrs@125°C 160 hrs@125°C
Final Electrical
( Group A )
MIL-PRF-38534
& Specification
MIL-PRF-38534
1014
25°C
25°C
-55°C, +25°C,
+125°C
N/A
-55°C, +25°C,
+125°C
10%
PDA
N/A
Cond A
N/A
N/A
Cond A, C
N/A
Seal, Fine and Gross
Radiographic
External Visual
Cond A, C
N/A
Cond A, C
N/A
2012
2009
Yes
Yes
Yes
Notes:
Best commercial practice
Sample tests at low and high temperatures
-55°C to +105°C for AHE, ATO, ATW
Part Numbering
AFL 28 05 S X /CH
Screening Level
Model
(Please refer to Screening Table)
No suffix, ES, HB, CH
Input Voltage
28 = 28V
50 = 50V
120 = 120V
Case Style
W, X, Y, Z
270 = 270V
Output
S = Single
Output Voltage
05 = 5V, 06 = 6V
07 = 7V, 08 = 8V
09 = 9V, 12 = 12V
15 = 15V, 28 = 28V
WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 322 3331
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. 12/2006
12
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