5962-9161303HZX - International Rectifier

10/24/02

www.irf.com 1

ADVANCED ANALOG

HYBRID-HIGH RELIABILITY

DC/DC CONVERTERS

A TW28XXD SERIES

Description

n18 to 40 VDC Input Range (28 VDC Nominal)

n±12V and ±15V Outputs Available

nIndefinite Short Circuit and Overload

Protection

n22.8 W/in3 Power Density

n30 W Output Power

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 85%

nShutdown from External Signal

nFull Military Screening

n200,000 hour MTBF at 85°C

Features

ATW

28V Input, Dual 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 may not

necessarily meet all of the other MIL-PRF-38534 re-

quirements, e.g., element evaluation and Periodic In-

spection (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 a more limited screening

are also available for use in less demanding applica-

tions. Variations in electrical, mechanical and screen-

ing can be accommodated. Contact Advanced Analog

for special requirements.

n MIL-PRF-38534 Compliant Versions

Available

Three standard temperature grades are offered. Refer

to Part Number section for more severe environments.

The ATW28XXD 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 inputs with ±12V and ±15V

dual outputs to satisfy a wide range of requirements.

The circuit design incorporates a pulse width modu-

lated 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 trans-

formers in the forward and feedback circuits.

PD - 94557

2www.irf.com

ATW28XXD Series

Specifications

For Notes to Specifications, refer to page 3

T able I. Electrical Performance Characteristics

ATW2812D

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 vol tage VOUT I

OUT = 0 1 All ±11.88 ±12.12 V

2,3

±11.76 ±12.24

Output cur rent 1, 2 IOUT V

IN = 18, 28, and 40 V dc ,

each out put 1,2,3 All 250 2250 mA

Output ri ppl e voltage 3 VRIP V

IN = 18, 28, and 40 V dc ,

B.W. = 20Hz to 2MHz 1,2,3 All 85 mVp-p

Line regulation 4 VRLINE V

IN = 18, 28, and 40 V dc ,

Iout = 0,1250 , and 2500m A 1 All 30 mV

2,3 60

Load regul ati on 4 VRLOAD V

IN = 18, 28, and 40 V dc ,

IOUT = 0, 1250, and 2500m A 1,2,3 All 120 mV

Cross regulation 5 VRCROSS 10% to 90 % l oad c h ange 1,2, 3 All 3.5 %

Input current IIN I

OUT = 0, inhibit (pin 8)

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

OUT = 0,inhib it (pi n 8) = open 50

Input ripple current 3, 4 IRIP I

OUT = 2500mA

B.W. = 20Hz to 2MHz 1,2,3 All 50 mAp-p

Efficiency 4 EFF I

OUT = 2500mA 1 All 80 %

TC = +25°C

Isol at i on 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 6, 7 CL No effe ct on dc

performance, Tc = +25°C,

tota l for bot h outputs

4 All 200 µF

Powe r di s sipat ion

load fault PD Ov erloa d, TC = +25°C 8 1 All 12

Short c i rcuit, TC = +25°C 9

Switching frequency 4 FS I

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

02 250 270

03 275 300

Output response to st ep

transient load

changes 4, 9

VOTLOAD 1250mA to/fro m 25 00m A 4,5, 6 All -400 +400 mV pk

0mA to/from 2500mA 4,5,6 All -800 +800

Recovery time step

transient load

changes 4, 9, 10

TTLOAD 1250mA to/fro m 25 00m A 4,5, 6 All 70 µs

0mA to/from 1250mA 4,5,6 All 500

1250mA to/fro m 0m A 4,5, 6 All 5 ms

Input Voltage -0.5V to 50V

Soldering Temperature 300°C for 10 seconds

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

Storage -65° C to +135°C

ABSOLUTE MAXIMUM RATINGS

www.irf.com 3

ATW28XXD Series

Notes to Specifications

T able I. Electrical Performance Characteristics - continued ATW2812D

1 Parameter guaranteed by line, load and cross regulation tests.

2 Up to 90% of full power is available from either output provided the total output does not exceed 30W.

3 Bandwidth guaranteed by design. Tested for 20KHz to 2MHz.

4 Load current split equally between +VOUT and –VOUT.

5 Three-watt load on output under test, 3 watt to 27 watt load change on other output.

6 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 circuitr y, appearing as a shor t circuit during tur n-on.

7 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.

8 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.

9 Load step transition time between 2 and 10 microseconds.

10 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.

11 Input step transition time between 2 and 10 microseconds.

12 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 8) while power is applied to the input.

Test Symbol Conditions

-55°C ≤Tc ≤+125°C

Vin = 28 Vdc ±5%, CL = 0

unless ot herwi se specified

Group A

Subgroups

Device

Types Limits Unit

Min Max

Output response

transient step line

changes 4, 7, 11

VOTLINE Input step from/to 18 to 40

Vdc, IOUT = 2500mA 4,5,6 All -800 +800 mV pk

Recovery time

transient step line

change 4, 7, 10, 11

TTLINE Input step from/to 18 to 40

Vdc, IOUT = 2500mA 4,5,6 All 4000

µs

Turn on overshoot 4 VTonOS I

OUT = 0 and 2500mA 4,5, 6 All 75 0 mV pk

Turn on delay 4, 12 TonD I

OUT = 0 and 2500mA

4,5,6 All 14 ms

Load fault recovery 7 TrLF 4,5,6 All 14 ms

Weight Flange 75 grams

4www.irf.com

ATW28XXD Series

Specifications

T able II. Electrical Performance Characteristics

ATW2815D

For Notes to Specifications, refer to page 5

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 V

IN = 18, 28, an d 40 Vdc 1 All ±14.85 ±15.15 VDC

OUT = 0 2,3 All ±14.70 ±15.30 VDC

Output current 11, 13 IOUT V

IN = 18, 28, and 40 V dc 1,2, 3 All 0.20 0 2000 mADC

Output ripple voltage 8 VRIP V

IN = 18, 28, an d 40 V dc,

B.W. = DC to MHz 1,2,3 All 85 mVp-p

Output Power 4, 11 POUT V

IN = 18, 28, 40 V dc 1,2, 3 A l l 30 W

Line regulati o n 9, 10 VRLINE V

IN = 18, 28, an d 40 V dc,

Iout = 0, 1000, and 2000 m A 1 All 35 mV

2,3 All 75 mV

Load regulation 9, 10 VRLOAD V

IN = 18, 28, an d 40 V dc,

IOUT = 0, 1000, a nd 20 00mA 1,2,3 All 150 mV

Inpu t c ur ren t I IN I

OUT = 0, inhi bi t (pin 8) 1,2, 3 All 12 mADC

OUT = 0, inhi bi t (pi n 8) = open 1,2,3 A l l 30 mADC

Inpu t rippl e c u rr ent IRIP I

OUT = 2000mA 1,2, 3 All 60 mAp- p

Efficiency EFF IOUT = 2500mA TC = 25°C 1 All 80 %

Iso l at i on ISO Input to outp ut or any pin

to case (e xc ept pin 8) at

500V dc Tc = 25°C

1 All 100

MΩ

Capac i t i ve load 6, 12 CL No ef fe c t on dc perf orm an c e ,

Tc = 25°C 4 All 500 µF

Power dissipation

load fault PD Overload, TC = +25°C 3 1 All 9

Short circuit, TC = +25°C 1 All 9 W

Switching frequency FS I

OUT = 2000mA 1,2, 3 01 237 263 KHz

1,2,3 02 230 245 KHz

1,2,3 03 250 265 KHz

Output response to step

transient

load c h an ges 7, 9, 10

VOTLOAD 50% lo ad to/fr om 10 0% load 4,5, 6 All -300 +3 00 mV pk

N o l oad to 100% l oad 4,5, 6 All -800 -800 mV pk

100% load to no load 4,5, 6 All +800 +800 mV pk

Recovery time step

transient load changes1, 7 TTLOAD 50 % load to/from 10 0% load 4,5,6 All 25 µs

N o l oad to 50% lo ad 4,5, 6 All 500 µs

50% load to no load 4,5, 6 All 7 ms

Input Voltage -0.5V to 50V

Soldering Temperature 300°C for 10 seconds

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

Storage -65° C to +135°C

ABSOLUTE MAXIMUM RATINGS

www.irf.com 5

ATW28XXD Series

T able II. Electrical Performance Characteristics - continued

Notes to Specifications

ATW2815D

1 Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1% of VOUT at 50% load.

2 Turn-on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the

inhibit pin (pin 8) while power is applied to the input.

3 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.

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

5 Input step transition time between 2 and 10 microseconds.

6 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 will interfere with the operation of the load fault detection circuitry,

appearing as a short circuit during turn on.

7 Load step transition time between 2 and 10 microseconds.

8 Bandwidth guaranteed by design. Tested for 20KHz to 2MHz.

9 Load current split equally between +VOUT and –VOUT.

10 When operating with unbalanced loads, at least 25% of the load must be on the positive output to maintain regulation.

11 Parameter guaranteed by line and load regulation tests.

12 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.

13 Up to 90% of full power is available from either output provided the total output does not exceed 30 watts.

Test Symbol Conditions

-55°C ≤Tc ≤+125°C

Vin = 28 Vdc ±5% , CL = 0

unless otherwi s e s pec if ied

Group A

Subgroups

Device

Types Limits Unit

Min Max

Output response

transient s t ep line

changes 5, 12

VOTLINE Input step from/t o 18 t o

40VDC 4,5,6 All +180 mV pk

Input step f rom 40 to18 VDC 4, 5, 6 All -600 mV pk

Recovery ti me

transient s t ep line

changes 1. 5, 12

TTLINE Input st ep f rom/ t o 18 t o 40

VDC 4,5,6 All 400

µs

Input step f rom 40 to 18 VDC 4,5,6 All 400 µs

Turn on overshoot VTonOS I

OUT = 0 and 2000mA 4,5,6 All 750 mV pk

Turn on delay 2 TonD I

OUT = 0 and 2000mA

4,5,6 All 12 ms

Load fault recovery 12 TrLF V

IN = 18 to 40 VDC 4,5,6 All 12 ms

Weight Flange 75 grams

6www.irf.com

ATW28XXD Series

Connecting the inhibit input (Pin 8) 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 TW28XXD Block Diagram

Application Information

Inhibit Function

EMI Filter

An optional external EMI filter (AFC461) is available that will

reduce the input ripple current to levels below the limits

imposed by MIL-STD-461B CEO3.

Device Synchronization

To take advantage of this capability, the system designer

must assign one of the conver ters 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 2) of the master device is connected to the

synchronization input (pin 2) 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

Whenever multiple DC/DC converters are utilized in a single

system, significant low frequency noise may be generated

due to the slight 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 allows synchroni-

zation of multiple AHE/ATW type converters, thus eliminat-

ing this type of noise.

ATW28xxD

ATW28xxS

AFC461

AFV461

ATW28xxD

or O ther

Compatable

+ In

Case

Return

Output

MSTR

SLV

+ In

Return

Output

Return

System

Bus

Output

+Vout

Return

Pulse W idth

M o d u la to r

EMI

Filter

+Input

Enable

Input

Return

Drive 1

Drive 2

E rr o r A mp

& Re fe re n c e

5-Vout

www.irf.com 7

ATW28XXD Series

Pin Designation

A TW28XXD Case Outlines

Part Numbering

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

ATW 28 15 D / CH - M STR

Model

In p ut Volta ge

28 = 28V Nom inal

Outpu t Vo ltag e

Single - 05, 12, 15V DC

Dual - 12 = ±12V, 15 = ±15V

Outputs

S = Single

D = Dual

Screening

–

, ES, HB, CH

Sync Option

MSTR = Master

SLV = Slave

O m it for Standard

Pin No. Designation

1 Positive Input

2 N/C Standard or

Sync . ( Optional )

3 Positive Output

4 Output Return

5 Negative Output

6 N/C

7 Case Ground

8 Inhibit

9 N/C

10 Input Return

Enable

8www.irf.com

ATW28XXD 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 TW28XXD 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 Number Pin

5962-9210901HZX 52467 ATW2812D/CH

5962-9210902HZX 52467 ATW2812D/CH-SLV

5962-9210903HZX 52467 ATW2812D/CH-MSTR

5962-9161301HZX 52467 ATW2815D/CH

5962-9161302HZX 52467 ATW2815D/CH-SLV

5962-9161303HZX 52467 ATW2815D/CH-MSTR

-55°C

Code