ATW2815S/ESB - INTERNATIONAL RECTIFIER

12/14/06

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HYBRID-HIGH RELIABILITY

DC/DC CONVERTER

ATW28XXS SERIES

Description

n19V to 40VDC Input Range (28VDC Nominal)

n30W Output Power

nIndefinite Short Circuit and Overload Protection

n22.8W/in3 Power Density

nFast Loop Response for Superior Transient

Characteristics

nOperating Temperature Range from -55°C to

+125°C Available

nPopular Industry Standard Pin-Out

nResistance Seam Welded Case for Superior

Long Term Hermeticity

nEfficiencies up to 83%

nShutdown from External Signal

nMilitary Screening

n250,000 hour MTBF at 85°C

n Standard Microcircuit Drawings Available

Features

ATW

28V Input, Single Output

The advanced feedback design provides fast loop

response for superior line and load transient

characteristics and offers greater reliability and radiation

tolerance than devices incorporating optical elements

in the feedback circuits.

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.

Three standard temperature grades are offered. Refer

to Part Number section. These devices are provided in

a flanged package for secure mounting in severe

environments.

The ATW28XXS Series of DC/DC converters feature

high power density and an extended temperature range

for use in military and industrial applications. Designed

to MIL-STD-704 input requirements, these devices

operate with a nominal 28VDC input and are available

with single outputs at 5V,12V and 15V. The circuit design

incorporates a pulse width modulated push-pull

topology operating in the feed-forward mode at a

nominal switching frequency of 270KHz. Input to output

isolation is achieved through the use of transformers in

the forward and feedback circuits.

PD-94556A

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ATW28XXS Series

Specifications

For Notes to Specifications, refer to page 3

Table I. Electrical Performance Characteristics

ATW2805S

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

Absolute Maximum Ratings

Test Symbol Conditions

-55°C ≤ Tc ≤+125°C

Vin = 28 Vdc ±5%, CL = 0

Unless otherwise specified

Group A

Subgroups

Device

Types

Limits Unit

Min Max

Output voltage VOUT I

OUT = 0 1 All 4.95 5.05 V

2,3 4.90 5.10

Output current 1 IOUT V

IN = 19, 28, and 40 V dc 1,2,3 All 0 6000 mA

Output ripple voltage 2 VRIP V

IN = 19, 28, and 40 V dc,

B.W. = dc to 2MHz

1,2,3 All 50 mVp-p

Output power 1, 3 POUT V

IN = 19,28, and 40 V dc 1,2,3 All 30 W

Line regulation 4 VRLINE V

IN = 19, 28, and 40 V dc,

Iout = 0, 3000, and 6000mA

1 All 5.0 mV

2,3 20

Load regulation 4 VRLOAD V

IN = 19, 28, and 40 V dc,

IOUT = 0, 3000, and 6000mA

1,2,3 All 30 mV

Input current IIN I

OUT = 0, inhibit (pin 2)

tied to input return (pin 10)

1,2,3 All 18 mA

OUT = 0, inhibit (pin 2) = open 40

Input ripple current 2 IRIP I

OUT = 6000mA

B.W. = dc to 2MHz

1,2,3 All 20 mAp-p

Efficiency EFF I

OUT = 6000mA 1 All 78 %

TC = +25°C

Isolation ISO Input to output or any pin

to case (except pin 7) at 500

V dc Tc = +25°C

1 All 100

MΩ

Capacitive load 5, 6 CL No effect on dc performance,

Tc = +25°C

4 All 500 µF

Power dissipation

load fault

PD Overload, TC = +25°C 7 1 All 12

Short circuit, TC = +25°C 9.0

Switching frequency FS I

OUT = 6000mA 4,5,6 01 250 300 KHz

02 250 270

03 275 300

Output response to step

transient load changes 8

VOTLOAD 4000mA to/from 6000mA 4,5,6 All -500 +500 mVpk

500mA to/from 2500mA 4,5,6 -500 +500

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ATW28XXS Series

Notes to Specifications

Table I. Electrical Performance Characteristics - continued ATW2805S

1 Parameter guaranteed by line and load regulation tests.

2 Bandwidth guaranteed by design. Tested for 20kHz to 2.0MHz.

3 Above +125°C case, derate output power linearly to 0 at +135°C.

4 Output voltage measured at load with remote sense leads connected across load.

5 Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.

A capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the

operation of the load fault detection circuitry, appearing as a short circuit during turn-on.

6 Parameter shall be tested as part of design characterization and after design or process changes.

Thereafter, parameters shall be guaranteed to the limits specified in Table I.

7 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.

8 Load step transition time between 2.0µs and 10µs.

9 Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1.0% of VOUT at 50% load.

10 Turn-on delay time measurement is for either a step application of power at the input or the removal of

ground signal from the inhibit pin (pin 1) while power is applied to the input is unlimited.

Test Symbol Conditions

-55°C ≤ Tc ≤+125°C

Vin = 28 Vdc ±5%, CL = 0

unless otherwise specified

Group A

Subgroups

Device

Types

Limits Unit

Min Max

Recovery time step

transient load changes 8, 9

TTLOAD 4000mA to/from 6000mA 4 All 100 µs

5,6 200

500mA to 2500mA 4 All 100

5,6 200

Turn on overshoot VTonOS I

OUT = 0 and 6000mA 4,5,6 All 500 mV pk

Turn on delay 10 TonD I

OUT = 0 and 6000mA

4,5,6 All 12 ms

Load fault recovery 6, 10 TrLF 4,5,6 All 12 ms

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ATW28XXS Series

Specifications

Table II. Electrical Performance Characteristics

ATW2812S

For Notes to Specifications, refer to page 5

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

Absolute Maximum Ratings

Test Symbol Conditions

-55°C ≤ Tc ≤+125°C

Vin = 28 Vdc ±5%, CL = 0

Unless otherwise specified

Group A

Subgroups

Device

Types

Limits Unit

Min Max

Output voltage VOUT I

OUT = 0 1 All 11.88 12.12 V

2,3 11.76 12.24

Output current 1 IOUT V

IN = 18, 28, and 40 V dc 1,2,3 All 2500 mA

Output ripple voltage 2 VRIP V

IN = 18, 28, and 40 V dc,

B.W. = 20Hz to 2MHz

1,2,3 All 50

mVp-p

Line regulation VRLINE V

IN = 18, 28, and 40 V dc,

Iout = 0, 1250, and 2500mA

1 All ±30 mV

2,3 ±60

Load regulation VRLOAD V

IN = 18, 28, and 40 V dc,

IOUT = 0, 1250, and 2500mA

1,2,3 All ±120 mV

Input current IIN I

OUT = 0, inhibit (pin 2)

tied to input return (pin 10)

1,2,3 All 18 mA

OUT = 0, inhibit (pin 2) =

open

Input ripple current 2 IRIP I

OUT = 2500mA

B.W. = 20Hz to 2MHz

1,2,3 All 20

mAp-p

Efficiency EFF I

OUT = 2500mA 1 All 78 %

2,3 75

Isolation ISO Input to output or any pin

to case (except pin 7) at 500

V dc Tc = +25°C

1 All 100 MΩ

Capacitive load 3, 4 CL No effect on dc

performance,

Tc = +25°C

4 All 200 µF

Power dissipation

load fault

PD Overload 5 1 All 12

Short circuit 1,2,3 9.0

Switching frequency FS I

OUT = 2500mA 4,5,6 01 250 300 KHz

02 250 270

03 275 300

Output response to

step transient load

changes 6

VOTLOAD 1250mA to/from 2500mA 4,5,6 All -800 +800 mVpk

0mA to/from 1250mA -1000 +1000

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ATW28XXS Series

Table II. Electrical Performance Characteristics - continued

Notes to Specifications

ATW2812S

1 Parameter guaranteed by line and load regulation tests.

2 Bandwidth guaranteed by design. Tested for 20kHz to 2.0MHz.

3 Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.

A capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the

operation of the load fault detection circuitry, appearing as a short circuit during turn-on.

4 Parameter shall be tested as part of design characterization and after design or process changes.

Thereafter, parameters shall be guaranteed to the limits specified in Table II.

5 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.

6 Load step transition time between 2.0µs and 10µs.

7 Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1.0% of VOUT at 50% load.

8 Input step transition time between 2.0µs and 10µs.

9 Turn-on delay time measurement is for either a step application of power at the input or the removal of

ground signal from the inhibit pin (pin 2) while power is applied to the input.

Test Symbol Conditions

-55°C ≤ Tc ≤ +125°C

Vin = 28 Vdc ±5%, CL = 0

unless otherwise specified

Group A

Subgroups

Device

Types

Limits Unit

Min Max

Recovery time step

transient load changes 6, 7

TTLOAD 1250mA to/from 2500mA 4 All 100 µs

5,6 200

0mA to 1250mA 4 All 5.0 ms

5,6 10

Output response to VOTLINE Input step 18V to/ from 4,5,6 All -1000 +1000 mVpk

Transient step 40V dc,

Line changes IOUT = 2500mA 4, 8

Recovery time TTLINE Input step 18V to/ from 4,5,6 All 500 µs

Transient step 40V dc

Line changes IOUT = 2500mA 4, 7, 8

Turn on overshoot VTonOS I

OUT = 0 and 2500mA 4,5,6 All 600 mVpk

Turn on delay TonD IOUT = 0 and 2500mA 9

4,5,6 All 12 ms

Load fault recovery 4, 9 TrLF 4,5,6 All 12 ms

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ATW28XXS Series

Specifications

Table III. Electrical Performance Characteristics

ATW2815S

For Notes to Specifications, refer to page 7

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

Absolute Maximum Ratings

Test Symbol Conditions

-55°C ≤ Tc ≤ +125°C

Vin = 28 Vdc ±5%, CL = 0

Unless otherwise specified

Group A

Subgroups

Device

Types

Limits Unit

Min Max

Output voltage VOUT I

OUT = 0 1 All 14.85 15.15 V

2,3 14.70 15.30

Output current 1 IOUT V

IN = 17, 28, and 40 V dc 1,2,3 All 0 1333 mA

Output ripple voltage 2 VRIP V

IN = 17, 28, and 40 V dc,

B.W. = dc to 2MHz

1,2,3 All 60 mVp-p

Output power 1, 3 POUT V

IN = 17,28, and 40 V dc 1,2,3 All 20 W

Line regulation VRLINE V

IN = 17, 28, and 40 V dc,

Iout = 0, 677, and 1333mA

1 All 35 mV

2,3 75

Load regulation VRLOAD V

IN = 17, 28, and 40 V dc,

IOUT = 0, 677, and 1333mA

1,2,3 All 150 mV

Input current IIN I

OUT = 0, inhibit (pin 2)

tied to input return (pin 10)

1,2,3 All 18 mA

OUT = 0, inhibit (pin 2) =

open

Input ripple current 2 IRIP I

OUT = 1333mA

B.W. = dc to 2MHz

1,2,3 All 50 mAp-p

Efficiency EFF I

OUT = 1333mA 1 All 80 %

C = +25°C

Isolation ISO Input to output or any pin

to case (except pin 8) at

500

V dc Tc = +25°C

1 All 100 MΩ

Capacitive load 4, 5 CL No effect on dc

performance,

Tc = +25°C

4 All 200 µF

Power dissipation

load fault

PD Overload, TC = +25°C 6 1 All 6.0

Short circuit, TC = +25°C 6.0

Switching frequency FS I

OUT = 1333mA 4,5,6 01 225 275 KHz

02 225 245

03 250 275

Output response to step

transient load changes 7

VOTLOAD 50% load to/from 100%

load

4 All -300 +300 mVpk

5,6 -450 +450

No load to/from 50% load 4 -500 +500

5,6 -750 +750

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ATW28XXS Series

Table III. Electrical Performance Characteristics - continued ATW2815S

Notes to Specifications

1 Parameter guaranteed by line and load regulation tests.

2 Bandwidth guaranteed by design. Tested for 20kHz to 2.0MHz.

3 For operation at 16 Vdc input, derate output power by 33%.

4 Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.

A capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the

operation of the load fault detection circuitry, appearing as a short circuit during turn-on.

5 Parameter shall be tested as part of design characterization and after design or process changes.

Thereafter, parameters shall be guaranteed to the limits specified in Table III.

6 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.

7 Load step transition time between 2.0µs and 10µs.

8 Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1.0% of VOUT at 50% load.

9 Input step transition time between 2.0µs and 10µs.

10 Turn-on delay time measurement is for either a step application of power at the input or the removal of

ground signal from the inhibit pin (pin 2) while power is applied to the input.

Test Symbol Conditions

-55°C ≤ Tc ≤ +125°C

Vin = 28 Vdc ±5%, CL = 0

unless otherwise specified

Group A

Subgroups

Device

Types

Limits Unit

Min Max

Recovery time step

transient load

changes 7, 8

TTLOAD 50% load to/from 100% load 4 All 70 µs

5,6 100

No load to 50% load 4,5,6 1500

50% load to no load 4,5,6 5.0 ms

Output response to

transient step line

changes 5, 9

VOTLINE Input step 17 to 40 Vdc 4,5,6 All 500 mVpk

Input step 40 to 17 Vdc 4,5,6 1500

Recovery time

transient line

changes 5, 8, 9

TTLINE Input step 17 tp 40 Vdc 4,5,6 All 800 ms

Input step 40 to 17 Vdc 4,5,6 800

Turn on overshoot VTonOS I

OUT = 0 and 1333mA 4,5,6 All 600 mVpk

Turn on delay 10 TonD I

OUT = 0 and 1333mA

4,5,6 All 10 ms

Load fault recovery 5 TrLF 4,5,6 All 10 ms

Weight Flange 75 g

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ATW28XXS Series

Connecting the inhibit input (Pin 2) to input common (Pin 10)

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.

Block Diagram

Application Information

Inhibit Function (Enable)

EMI Filter

An optional EMI filter (AFC461) will reduce the input ripple

current to levels below the limits imposed by MIL-STD-461

CEO3.

Device Synchronization

To take advantage of this capability, the system designer

must assign one of the converters as the master. Then,

by definition, the remaining converters become slaves

and will operate at the masters’ switching frequency.

The user should be aware that the synchronization

system is fail-safe; that is, the slaves will continue

operating should the master frequency be interrupted for

any reason. The layout must be such that the

synchronization output (pin 8) of the master device is

connected to the synchronization input (pin 8) of each

slave device. It is advisable to keep this run short to

minimize the possibility of radiating the 250KHz switching

frequency.

The appropriate parts must be ordered to utilize this

feature. After selecting the converters required for the

system, a ‘MSTR’ suffix is added for the master converter

part number and a ‘SLV’ suffix is added for slave part

number. See Part Number section.

Typical Synchronization Connection

Remote Sense (ATW2805S only)

Better than 0.1% line and load regulation (case temperature

constant) are typical when the remote sense leads are used.

If the remote sense leads are left unconnected, then the

output voltage (measured at pins 4 and 5) will rise to

approximately 5.4VDC. If the remote sense leads are shorted

together, the output voltage may rise above 10VDC

depending on load, possibly damaging both the converter

and load.

Whenever multiple DC/DC converters are utilized in a single

system, significant low frequency noise may be generated

due to the sight differences in the switching frequencies of

the converters (beat frequency noise). Because of the low

frequency nature of this noise (typically less than 10KHz), it

is difficult to filter out and may interfere with proper operation

of sensitive systems (communications, radar or telemetry).

International Rectifier offers an option, which provides

synchronization of multiple AHE/ATW type converters, thus

eliminating this type of noise.

ATW28xxD

ATW28xxS

AFC461

AFV461

ATW28xxD

or Other

Compatable

+ In

Case

Return

Output

MSTR

SLV

+ In

Return

Output

Return

System

Bus

Output

+Vout

Output

Return

Pulse Width

Modulator

EMI

Filter

+Input

Enable

Input

Return

Error

Amp &

Ref -Sense

Drive 1

Drive 2

Sync 6+Sense

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ATW28XXS Series

Pin Designation

Mechanical Outline

2.70

Max

2.360

1.350

Max

1.95

0.500

Max

0.05

0.040 D X

0.26 L Pins

4 X 0.400

=1.600

610987

123 54

1.000

Pin # Designation

1 + Input

2 Enable Input

3 - Remote Sense *

4 Output Return

5 + Output

6 + Remote Sense *

7 Case Ground

8 NC ( or Sync. Option)

9 NC

10 Input Return

* ATW2805S only. ATW2812S, ATW2815S have NC

Standard Microcircuit Drawing Equivalence Table

Standard Microcircuit Vendor Cage IR Standard

Drawing Number Code Part Number

5962-91579 52467 ATW2805S

5962-92110 52467 ATW2812S

5962-91599 52467 ATW2815S

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ATW28XXS Series

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. 12/2006

Part Numbering

Notes:

 Best commercial practice

 Sample tests at low and high temperatures

 -55°C to +105°C for AHE, ATO, ATW

Device Screening

Requirement MIL-STD-883 Method No Suffix ES

HB CH

Temperature Range -20°C to +85°C -55°C to +125°C

-55°C to +125°C -55°C to +125°C

Element Evaluation MIL-PRF-38534 N/A N/A N/A Class H

Non-Destructive

Bond Pull

Internal Visual 2017

Yes Yes Yes

Temperature Cycle 1010 N/A Cond B Cond C Cond C

Constant Acceleration 2001, Y1 Axis N/A 500 Gs 3000 Gs 3000 Gs

PIND 2020 N/A N/A N/A N/A

Burn-In 1015 N/A 48 hrs@hi temp 160 hrs@125°C 160 hrs@125°C

Final Electrical MIL-PRF-38534 25°C 25°C

-55°C, +25°C, -55°C, +25°C,

( Group A ) & Specification +125°C +125°C

PDA MIL-PRF-38534 N/A N/A N/A 10%

Seal, Fine and Gross 1014 Cond A Cond A, C Cond A, C Cond A, C

Radiographic 2012 N/A N/A N/A N/A

External Visual 2009

Yes Yes Yes

N/A N/A2023 N/A N/A

ATW 28 15 S /CH - MSTR

Model

Input Voltage

Nominal

28 = 28V

Output

S = Single

Output Voltage

05 = 5V

12 = 12V

15 = 15V

Screening Level

(Please refer to Screening Table)

No Suffix, ES, HB, CH

Sync Option

MSTR = Master

SLV = Slave

Omit for Standard