5962-9159905HZX - International Rectifier

10/25/02

www.irf.com 1

ADVANCED ANALOG

HYBRID-HIGH RELIABILITY

DC/DC CONVERTERS

ATW28XXS SERIES

Description

n19 to 40 VDC Input Range (28 VDC Nominal)

n30 Watts Output Power

nIndefinite Short Circuit and Overload

Protection

n22.8 W/in3 Power Density

nFast Loop Response for Superior Transient

Characteristics

nOperating Temperature Range from -55°C to

+125°C Available

nPopular Industr y 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

Features

ATW

28V Input, Single Output

The advanced feedback design provides fast loop re-

sponse for superior line and load transient character-

istics and offers greater reliability and radiation toler-

ance than devices incorporating optical elements in

the feedback circuits.

Manufactured in a facility fully qualified to MIL-PRF-

38534, these converters are available in four screen-

ing gr ades to satisfy a wide range of requirements. The

CH grade is fully compliant to the requirements of MIL-

PRF-38534 for class H. The HB grade is processed

and screened to the class H requirement, but does not

incorporate the element evaluation and Periodic In-

spection (PI) requirements of MIL-PRF-38534. Both

grades are tested to meet the complete group “A” test

specification over the full military temperature range

without output pow er der ation. Two grades with a more

limited screening process are also available for use in

less demanding applications. Variations in electrical,

mechanical and screening can be accommodated.

Contact Advanced Analog for special requirements.

n MIL-PRF-38534 Compliant Versions

Available

Three standard temperature grades are offered. Refer

to P a rt Number section. These devices are provided in

a flanged package for secure mounting in severe envi-

ronments.

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 op-

erate with a nominal 28 VDC input and are available

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

sign incorporates a pulse width modulated push-pull

topology operating in the feed-forward mode at a nomi-

nal switching frequency of 270KHz. Input to output

isolation is achieved through the use of transformers in

the forward and feedback circuits.

PD - 94556

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ATW28XXS Series

Specifications

For Notes to Specifications, refer to page 3

T able I. Electrical Performance Characteristics

ATW2805S

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 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

I

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 = +2 5 ° C 4 All 500 µF

Power diss ipation

load fault PD Overload, TC = +25°C 7 1 All 12

W

Short circuit, TC = +25°C 9

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

§

Input Voltage -0.5V to 50V

Soldering Temperat ure 300°C for 10 seconds

Case Temperature Operating -55°C to +125°C

Storage -65°C t o +135° C

ABSOLUTE MAXIMUM RA TINGS

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ATW28XXS Series

Notes to Specifications

T able I. Electrical Performance Characteristics - continued ATW2805S

1 Parameter guaranteed by line and load regulation tests.

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

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 shor t circuit during tur n-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 and 10 microseconds.

9 Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1

percent of VOUT at 50 percent 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 spec i fied

Group A

Subgroups Device

Types Limits Unit

Min Max

Recovery time step

transient l oad changes 8, 9 TTLOAD 4000mA to/ from 6000mA 4 All 100 µs

5,6 200

500m A to 2500mA 4 Al l 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

T able II. Electrical Performance Characteristics

ATW2812S

For Notes to Specifications, refer to page 5

Test Symbol Conditions

-55°C ≤ Tc ≤+125°C

Vin = 28 Vdc ±5%, CL = 0

Unless other wise specified

Group A

Subgroups

Device

Types Limits Unit

Min Max

Output vol tage V OUT 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 (pi n 2)

tied to input return (pin 10) 1,2,3 All 18 mA

I

OUT = 0, inhibit (pi n 2) = open 50

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

Isolat i on ISO Input to output or any pin

to cas e (except pin 7) at 500

V dc Tc = +25° C

1 All 100

MΩ

Capaciti ve load 3, 4 CL No ef fect on dc performance,

Tc = +25°C 4 All 200 µF

Power dissipation

load fault PD Overl oad 5 1 All 12

W

Short circuit 1,2,3 9

Switc hi ng f requency 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 mV pk

0m A to/from 1250m A -1000 +1000

§

Input Voltage -0.5V to 50V

Soldering Temperat ure 300°C for 10 seconds

Case Temperature Operating -55°C to +125°C

Storage -65°C t o +135° C

ABSOLUTE MAXIMUM RA TINGS

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ATW28XXS Series

T able II. Electrical Perf ormance Characteristics - continued

Notes to Specifications

ATW2812S

1 Parameter guaranteed by line and load regulation tests.

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

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 dur ing tur n-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 and 10 microseconds.

7 Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1

percent of VOUT at 50 percent load.

8 Input step transition time between 2 and 10 microseconds.

9 Tu r n-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 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 VT onOS 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

T able III. Electrical Performance Characteristics

ATW2815S

For Notes to Specifications, refer to page 7

Test Symbol Conditions

-55°C ≤ Tc ≤ +125°C

Vin = 28 Vdc ±5%, CL = 0

Unless other wise specified

Group A

Subgroups

Device

Types Limits Unit

Min Max

Output vol tage 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 (pi n 2)

tied to input return (pin 10) 1,2,3 All 18 mA

I

OUT = 0, inhibit (pi n 2) = open 35

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 %

TC = +25°C

Isolat i on ISO Input to output or any pin

to cas e (except pin 8) at 500

V dc Tc = +25° C

1 All 100

MΩ

Capaciti ve load 4, 5 CL No effect on dc performanc e,

Tc = +25°C 4 All 200 µF

Power dissipation

load fault PD Overload, TC = +25°C 6 1 All 6

W

Short circuit, TC = +25°C 6

Switc hi ng f requency FS I

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

02 225 245

03 250 275

Output response to step

transient l oad changes 7 VOTLOAD 50% load to/ from 100% load 4 All -300 +300 mV pk

5,6 -450 +450

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

5,6 -750 +750

§

Input Voltage -0.5V to 50V

Soldering Temperat ure 300°C for 10 seconds

Case Temperature Operating -55°C to +125°C

Storage -65°C t o +135° C

ABSOLUTE MAXIMUM RA TINGS

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ATW28XXS Series

T able 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 20 kHz to 2 MHz.

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

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 shor t circuit during tur n-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 and 10 microseconds.

8 Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1

percent of VOUT at 50 percent load.

9 Input step transition time between 2 and 10 microseconds.

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 l oad

changes 7, 8

TTLOAD 50% load to/f rom 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 ms

Output response to

transient step line

changes 5, 9

VOTLINE Input step 17 to 40 Vdc 4,5,6 All 500 m V pk

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 Al l 600 mVpk

Turn on delay 10 TonD I

OUT = 0 and 1333mA

4,5,6 All 10 ms

Load fault rec overy 5 TrLF 4,5,6 All 10 ms

Weight Flange 75 grams

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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 cir-

cuit voltage of the inhibit input is 11.5 ±1 VDC.

A TW28XXS Block Diagram

Application Information

Inhibit Function

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 sys-

tem is fail-safe; that is, the slaves will continue operating

should the master frequency be interrupted for any rea-

son. 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 possibil-

ity of radiating the 250KHz switching frequency.

The appropriate parts must be ordered to utilize this fea-

ture. After selecting the converters required for the sys-

tem, 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 tempera-

ture 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 5.4 VDC. If the remote sense leads are

shorted together, the output voltage may rise above 10 VDC

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).

Advanced Analog offers an option, which provides synchro-

nization of multiple AHE/ATW type converters, thus elimi-

nating this type of noise.

ATW28xxD

ATW28xxS

AFC461

or

AFV461

ATW28xxD

or Other

Compatable

+ In

Case

Return

Out

p

ut

Out

p

ut

Out

p

ut

MSTR

SLV

+ In

Return

Out

p

ut

Return

System

Bus

Out

p

ut

Out

p

ut

5

4

+Vout

Return

P ulse W idth

Modulator

EMI

Filter

1

2

10

+Input

Enable

Input

Return

Error

Amp &

Ref -Sense

FB

Drive 1

Drive 2

8

Sync

6+Sens

e

3

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ATW28XXS Series

Pin Designation

A TW28XXS Case Outlines

Part Numbering

2.70

0

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

ATW 28 05 S / CH - M STR

Model

In put Vo lt a g e

28 = 28V Nom inal

O utput V oltage

Sin

g

le - 05 , 1 2, 15 V D C

Dual - 12 = ±12V, 15 = ±15V

Outputs

S = Sin

g

le

D = Dual

Screening

–

, ES , HB, CH

Sync O ption

MSTR = Master

SLV = Slave

Omit for S tandard

Pin No. Designation

1 Positive Input

2 Inhibit Input

3 Neg. Remote S ense *

4 Output Common

5 Positive Output

6 Pos. Remote Sense *

7 Case Ground

8 N/C (or Sy nc. Option)

9 N/C

10 Input Common

* ATW2805S only. ATW2812S, ATW2815S have N/C

Enable Input

Input Return

Output Return

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ATW28XXS Series

Available Standard Military Drawing (SMD) Cross Reference

WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 322 3331

ADVANCED ANALOG: 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. 10/02

Available Screening Levels and Process V ariations for A TW28XXS Series

* Per Commercial Standards

Requirement MIL-STD-883

Method No

Suffix ES

Suffix HB

Suffix CH

Suffix

Temperature

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

Element

Evaluation MIL-PRF-38534

Internal V i sual 2017 ∗ Yes Yes Yes

Temperature

Cycle 1010, Cond C Cond A Yes Yes

Constant

Acceleration 2001, Cond A 500g 5,000g 5, 000g

Burn-in 1015

48hrs @ 85°C 48hrs @ 105°C 160hrs @ 125°C 160hrs @ 125°C

Final Electrical

(Group A) MIL-PRF-38534

& Specification 25°C 25°C -55, +25, +125°C -55, +25, +125°C

Seal, Fine &

Gross 1014 Yes Yes Yes

External

Visual 2009 ∗ Yes Yes Yes

Standardized Vendor Vendor

Military Drawing CAGE Similar

PIN Code PIN

5962-9157904HZX 52467 ATW2805S/CH

5962-9157905HZX 52467 ATW2805S/CH-SLV

5962-9157906HZX 52467 ATW2805S/CH-MSTR

5962-9211001HZX 52467 ATW2812S/CH

5962-9211002HZX 52467 ATW2812S/CH-SLV

5962-9211003HZX 52467 ATW2812S/CH-MSTR

5962-9159904HZX 52467 ATW2815S/CH

5962-9159905HZX 52467 ATW2815S/CH-SLV

5862-9159906HZX 52467 ATW2815S/CH-MSTR

115°C

-55°C to+85°C