Irf AFL28XXS Service Manual

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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.

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.

PD-94460C

AFL28XXS SERIES

28V Input, Single Output

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
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

3

Manufactured in a facility fully qualified to MIL-PRF­38534, 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.

www.irf.com 1

12/18/06

AFL28XXS Series

Specifications

Absolute Maximum Ratings

Input voltage -0.5V to +50VDC
Soldering temperature 300°C for 10 seconds
Operating case temperature -55°C to +125°C
Storage case temperature -65°C to +135°C

Static Characteristics -55°C < T

Parameter

INPUT VOLTAGE Note 6 16 28 40 V

OUTPUT VOLTAGE

AFL2805S
AFL2807S
AFL2808S
AFL2809S
AFL2812S
AFL2815S
AFL2828S

AFL2805S
AFL2807S

AFL2808S
AFL2809S
AFL2812S
AFL2815S
AFL2828S

OUTPUT CURRENT

AFL2805S
AFL2807S

AFL2809S
AFL2812S
AFL2815S
AFL2828S

OUTPUT POWER

AFL2805S
AFL2807S

AFL2809S
AFL2812S
AFL2815S
AFL2828S

MAXIMUM CAPACITIVE LOAD Note 1 10,000

OUTPUT VOLTAGE
TEMPERATURE COEFFICIENT

OUTPUT VOLTAGE REGULATION

AFL2828S Line
All Others Line

Load

OUTPUT RIPPLE VOLTAGE

AFL2805S
AFL2807S
AFL2808S
AFL2809S
AFL2812S
AFL2815S
AFL2828S

For Notes to Specifications, refer to page 4

AFL2808S

AFL2808S

Subgroups

Group A

2, 3
2, 3

2, 3
2, 3
2, 3
2, 3
2, 3

1, 2, 3
1, 2, 3

1, 2, 3

1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3

< +125°C, 16V< VIN < 40V unless otherwise specified.

CASE

Test Conditions

VIN = 28 Volts, 100% Load

1
1

1
1
1
1
1

VIN = 16, 28, 40 Volts - Note 6

Note 6

VIN = 28 Volts, 100% Load - Note 1, 6 -0.015 +0.015 %/°C

No Load, 50% Load, 100% Load
VIN = 16, 28, 40 Volts

VIN = 16, 28, 40 Volts, 100% Load,
BW = 10MHz

Min Nom Max Unit

4.95

6.93

7.92

8.91

11.88

14.85

27.72

4.90

6.86

7.84

8.82

11.76

14.70

27.44

-70

-20

-1.0

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

5.10

7.17

8.16

9.18

12.24

15.30

28.56

16

11.4
10
10

9.0

8.0

4.0

80
80
80
90

108
120
112

+70
+20

+1.0

30
40
40
40
45
50

100

2 www.irf.com

mV

V

A

W

µF

mV
mV

%

pp

Static Characteristics (Continued)

Parameter

INPUT CURRENT

No Load

Inhibit 1
Inhibit 2

INPUT RIPPLE CURRENT

AFL2805S
AFL2807S

AFL2809S
AFL2812S
AFL2815S
AFL2828S

CURRENT LIMIT POINT

As a percentage of full rated load

LOAD FAULT POWER DISSIPATION

Overload or Short Circuit

EFFICIENCY

AFL2805S
AFL2807S

AFL2809S
AFL2812S
AFL2815S
AFL2828S

ENABLE INPUTS

Sink Current
Converter On
Sink Current

SWITCHING FREQUENCY

SYNCHRONIZATION INPUT

Pulse Amplitude, Hi
Pulse Amplitude, Lo
Pulse Ris e Time
Pulse Duty Cycle

ISOLATION

DEVICE WEIGHT

MTBF

AFL2808S

AFL2808S

(Inhibit Function)

Converter Off

Frequency Range

1 Input to Output or Any Pin to Case

Group A

Subgroups

1

2, 3
1, 2, 3
1, 2, 3

1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3

1
2
3

1, 2, 3

1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3

1, 2, 3

1, 2, 3

1, 2, 3 500 550 600 KHz

1, 2, 3
1, 2, 3
1, 2, 3

Slight Variations with Case Style 85 g

MIL-HDBK-217F, AIF @ TC = 70°C 300 KHrs

Test Condit ion s

V

= 28 Volts

IN

I

= 0

OUT

Pin 4 Shorted to Pin 2
Pin 12 Shorted to Pin 8

VIN = 28 Volts, 100% Load, BW = 10MHz

= 90% V

V

OUT

Note 5

= 28 Volts

V

IN

= 28 Volts, 100% Load

V

IN

Logical Low on Pin 4 or Pin 12
Note 1
Logical High on Pin 4 and Pin 12 - Note 9
Note 1

Note 1
Note 1

(except Pin 3). Test @ 500VDC

, VIN = 28 Volts

NOM

AFL28XXS Series

Min Nom Max Unit

115
105
125

78
79
79
80
80
81
81

-0.5

2.0

500

2.0

-0.5

20

100

81
82
82
83
84
85
84

80
100

5.0

50

60
60
60
60
60
60
60

125
115
140

33

0.8

100

50

100

700

10

0.8

100

80

mA

mA

µA

µ

KHz

ns

MΩ

%

W

%

V

V

V
V

%

A

pp

For Notes to Specifications, refer to page 4

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AFL28XXS Series

Dynamic Characteristics -55°C < T

Param eter

LOAD TRANSIENT RESPONSE

AFL2805S Amplitude

Recovery

Amplit ude
Recovery

AFL2807S Amplitude

Recovery

Amplit ude
Recovery

AFL2808S Amplitude
Recovery

Amplit ude
Recovery

AFL2809S Amplitude

Recovery

Amplit ude
Recovery

AFL2812S Amplitude
Recovery

Amplit ude
Recovery

AFL2815S Amplitude
Recovery

Amplit ude
Recovery

AFL2828S Amplitude

Recovery

Amplit ude
Recovery

LINE TRANSIENT RESPONSE

Amplit ude
Recovery

TURN-ON CHARACTERISTICS

Overshoot
Delay

LOAD FAULT RECOVERY Same as Turn On Characteristics.

LINE REJECTION

Notes to Specifications:

1. Parameters not 100% tested but are guaranteed to the limits specified in the table.

2. Recovery time is measured from the initiation of the transient to where V

3. Line transient transition time ≥ 100µs.

4. Turn-on delay is measured with an input voltage rise time of between 100V and 500V per millisecond.

5. Current limit point is that condition of excess load causing output voltage to drop to 90% of nominal.

6. Parameter verified as part of another test.

7. All electrical tests are performed with the remote sense leads connected to the output leads at the load.

8. Load transient transition time ≥ 10µs.

9. Enable inputs internally pulled high. Nominal open circuit voltage ≈ 4.0VDC.

Group A

Subgroups

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

MIL-STD-461D, CS101, 30Hz to 50KHz

< +125°C, VIN=28V unless otherwise specified.

CASE

Test Conditions

Note 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%

Note 1, 2, 3

VIN Step = 16 ⇔ 40 Volts

VIN = 16, 28, 40 Volts. Note 4

Enabl e 1, 2 on. (Pins 4, 12 high or
open)

Note 1

has returned to within ±1.0% of V

OUT

Min Nom Max Unit

-450

-450

-500

-500

-500

-500

-600

-600

-750

-750

-750

-750

-1200

-1200

-500

0

40 50 dB

4.0

450
200

450
400

500
200

500
400

500
200

500
400

600
200

600
400

750
200

750
400

750
200

750
400

1200

200

1200

400

500
500

250

10

at 50% load.

OUT

mV

µs

mV

µ

mV

µs

mV

µ

mV

µs

mV

µs

mV

µs

mV

µs

mV

µs

mV

µs

mV

µs

mV

µs

mV

µs

mV

µs

mV

µs

mV
ms

s

s

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